Florian Statescu - Academia.edu (original) (raw)

Papers by Florian Statescu

Research paper thumbnail of The influence of the compaction process on the oscilation of soil hydrophysical properties from Tătăraşi area

“Ion Ionescu de la Brad” University of Agricultural Sciences and Veterinary Medicine, Iaşi, 2016

Research paper thumbnail of Research on the influence of soil particles shape on the retention capacity of soils from Dancu study area

“Ion Ionescu de la Brad” University of Agricultural Sciences and Veterinary Medicine, Iaşi, 2016

Research paper thumbnail of The study on the possibility of the soil suction simulation study of soils from breazu and dancu areas through the soil parameter estimator software

Research paper thumbnail of Classification and mapping of urban areas based on point clouds from ALS, aerial and satellite images

EGU General Assembly Conference Abstracts, Apr 1, 2019

Research paper thumbnail of The Recent Evolution of the Prut River Channel in the Territorial Administrative Unit of Prisăcani Commune - Iaşi County

Representing a direct response of hydrologic, hydrogeologic, geomorphologic, and anthropic factor... more Representing a direct response of hydrologic, hydrogeologic, geomorphologic, and anthropic factors, the dynamic of river channels has a useful scientific and practical importance, especially for the regions where the rivers play the role of state border. This article presents a detailed analysis of the dynamic of the Prut River channel for the last 125 years, concerning a 26 km sector of the river, which correspond to Prisacani territorial (local) administrative unit (LAU 2 nd order), Iaşi County. This segment can be considered as a representative natural border between Romania and Republic of Moldavia along the middle Prut River course, downstream the Stânca-Costeşti anthropic lake. The work consisted in digitization of a large series topographic maps (1893-1894 edition at 1:50,000 scale, 1940 edition at 1:20,000 scale, the 1949, 1960 and 1985 editions at 1:25,000 scale), various remote sensing images: LANDSAT images for the 1990 and 2000 decades, SENTINEL 1A and 2A images for the year 2015 and 2016, LiDAR DEM (acquired in 2012), and Google Earth® high resolution optical satellite images collection. For the last two years, the channel dynamic was validated and completed using GPS measurements.

Research paper thumbnail of for Physical Characterization of Salinated Soil

The Bulletin of the Polytechnic Institute of Jassy, Construction. Architecture Section, 2015

This paper had been aiming to analyze salinated soils, of the area Osoi-Moreni from the village P... more This paper had been aiming to analyze salinated soils, of the area Osoi-Moreni from the village Prisacani, Iasi city from physical properties point of view of this salinated soils. For this research we had took soils from two places: the first place are currently cultivated with corn (Zea mays), and the second soil place came from an area of uncultivated, which has not suffered work agricultural about seven years. The methods for analysis of physical characteristics of saline soils are important research for the diagnosis, monitoring and quality control saline soils which are used in agricultural.

Research paper thumbnail of Aspecte Privind Dispersia Unor Compuşi Chimici În Sol

Research paper thumbnail of HYDROTECHNICS Tom 55 ( 69 ) , Fascicola 1 , 2010 Models for predicting the gas diffusion coefficient in undisturbed soil

Overall objective of this project is mathematical modeling of diffusion processes, functional sta... more Overall objective of this project is mathematical modeling of diffusion processes, functional status and numerical methods development. This paper includes qualitative study to estimate the gas diffusion coefficient (DP/D0) in undisturbed soils. Based on empirical and numerical models of Penman [1940], Millington and Quirk [1960], Millington and Quirk [1961] and Moldrup [1999] has determined diffusion coefficient variation for different types of soil taken in the study. It was found that soil type, texture, structure, porosity, apparent density are the main factors influencing the diffusion and gas transport in porous media. The project conducted fundamental research on both general diffusion models and analysis models particulare major in science and engineering.

Research paper thumbnail of Quantitative and qualitative studies on hepatitis B antigen. Titer and subtypes in acute virual hepatitis patients and blood donors

Virologie, 1975

Hepatitis B antigen (HB Ag) titer and subtype were determined in blood samples obtained from 270 ... more Hepatitis B antigen (HB Ag) titer and subtype were determined in blood samples obtained from 270 HB Ag-positive acute viral hepatitis (AVH) patients, as well as in 100 HB Ag-positive blood donors. The percentage distribution of the HB Ag titer shows a shift towards lower titers in the case of "healthy carriers". In both AVH patients and blood donors the "ay" antigenic subtype was found to be predominant.

Research paper thumbnail of Investiganting Correlation LST and Vegetation Indices Using Landsat Images for the Warmest Month: A Case Study of Iasi County

Annals of Valahia University of Targoviste, Geographical Series, 2018

In this paper is investigating correlation between land surface temperature and vegetation indice... more In this paper is investigating correlation between land surface temperature and vegetation indices (Normalized Difference Vegetation Index - NDVI, Enhanced Vegetation Index 2 - EVI2 and Modified Soil Adjusted Vegetation Index - MSAVI) using Landsat images for august, the warmest month, for study area. Iaşi county is considered as study area in this research. Study Area is geographically situated on latitude 46°48'N to 47°35'N and longitude 26°29'E to 28°07'E. Land surface temperature (LST) can be used to define the temperature distribution at local, regional and global scale. First use of LST was in climate change models. Also LST is use to define the problems associated with the environment. A Vegetation Indices (VI) is a spectral transformation what suppose spatial-temporal intercomparisons of terrestrial photosynthetic dynamics and canopy structural variations. Landsat5 TM, Landsat7 ETM+ and Landsat8 OLI, all data were used in this study for modeling. Landsat imag...

Research paper thumbnail of Recognition and Determination of Hydrodynamic Deficiencies in the Bioreactors of a Real Wastewater Treatment Plant by a Comprehensive Approach: Live Analysis Using Computational Fluid Dynamics

Environmental Engineering and Management Journal, 2021

The paper presents the results of research conducted on the technological analysis of bioreactors... more The paper presents the results of research conducted on the technological analysis of bioreactors operated at the Iasi wastewater treatment plant (WWTP) and based on them, some proposals for the intervention works needed to improve the technological process, proposals that were subsequently developed. The Iasi WWTP process is using, in the advanced biological stage, an artificial biological treatment with an activated sludge aerobic process, with continuous recirculation. The treatment process scheme is of A2/O type, including a nitrification-denitrification process, so named because it includes 3 distinct areas (anaerobic, anoxic for denitrification and oxic for nitrification). The biological treatment processes are complex, and in the development of the processes intervene physical, hydraulic, chemical and biochemical phenomena. The role of active sludge bioreactors is to remove the nonsedimentable organic compounds, to stabilize sludge organic matter, and to decrease the load of nitrogen and phosphorus-based nutrients from wastewater. Therefore, to gain a higher efficiency and to reach lower operating costs, there is a need for a more uniform flow and distribution of the poly-phase environment, with uniform aeration and a constant transit time for aeration tanks. The parameters being studied within the research program were: flow regime in bioreactors, transient flow distribution in bioreactors, retention time in bioreactors, air distribution in the aerobic area, the state of active sludge bioreactors, reliability of measuring and control devices and all related facilities.

Research paper thumbnail of The Impact of Sludge Storage on the Soil. Case Study: Tomesti Deposit in Iasi County, Romania

Environmental Engineering and Management Journal, 2021

The study was conducted in the sludge storage area in Tomesti, Iasi County. The sludge from the w... more The study was conducted in the sludge storage area in Tomesti, Iasi County. The sludge from the wastewater treatment process was stored in the Tomesti lagoon, which increased the pollutant concentrations in the soil. The goal of the present paper was to study the impact of sludge storage on the Tomesti soil by analyzing the contents of salts, heavy metals and microbiological loads (total coliform bacteria, enterococci, Escherichia coli, Clostridium perfringens, Salmonella spp). The total concentration of heavy metals in soil is a relevant indicator on the risk to human health and environment. Growing plants in polluted areas can be a remedial solution and can serve as an alternative tool in sustainable agriculture. Plants can influence the accumulation of heavy metals in soils, either by decreasing or increasing their accumulation. Following the carried analyses, we can say that some physical and chemical properties of the sludge were propagated to the soil on which the sludge is stored. Thus, the moisture of the soil located below the sludge layer increased by up to 20%, compared to the humidity of the neighboring soil, that is not influenced by the presence of sludge. It was also an adsorption medium for numerous cations and anions. From the group of tested heavy metals (Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, Zn), the only element present at polluting level is zinc. In the first soil horizon on which the sludge is stored, the zinc contents exceed 10.8 times the maximum permissible limit value, and for the neighboring soil this is 1.6 times. From a bacteriological point of view, the soil beneath the sludge lagoon is loaded with Salmonella genus bacterial colonies.

Research paper thumbnail of The Impact of the Compaction Process on the Variation of Soil Hydrophysical Properties from Breazu and Dancu Areas

The Bulletin of the Polytechnic Institute of Jassy, Construction. Architecture Section, 2016

The present study wants to highlight the influence it has compacting process on the variation of ... more The present study wants to highlight the influence it has compacting process on the variation of hydrophysical.properties of three types of soil In solving this unfavorable soil phenomenon this paper tries to noting the main effects exerted by the compaction process on the hydrophysical.properties distribution in time and space by applying laboratory methods for determining the physical and hydraulic properties of soils in Breazu and Dancu areas. Principal physical characteristics were determined: soil density, soil bulk density, texture and soil porosity. Hydraulic properties analyzed in order to mark the variation of water regime were: hydraulic conductivity (saturated and unsaturated) and soil suction. All these basic attributes of soil were determined in laboratory methods of applying wish traced internationally.

Research paper thumbnail of Modeling the Chlorine-Conveying Process Within a Drinking Water Distribution Network

Environmental Engineering and Management Journal, 2021

The distribution network is the last component of a water supply system in which potable water mu... more The distribution network is the last component of a water supply system in which potable water must be provided to the consumer. The presence of chlorine in drinking water is a necessity and a guarantee that water is microbiologically compliant. The study was carried out by means of the Epanet 2.0 program on a future distribution network in the hilly area, in which a simulation period of 4 days was considered. The water quality analysis was performed using the flow rates resulting from the hydraulic simulation. To track the propagation of the contaminant through network pipelines, a maximum permissible value of 0.5 mg/L, entered during the entire simulation period, was considered. The reactions that occur in the bulk flow, were modeled by means of a 1st and 2nd order a decomposition law. The obtained values of the free residual chlorine concentration showed that during the 96 h of simulation, there were certain pipelines in which the chlorine concentration did not meet the minimum allowable limit of 0.1 mg/L. Modeling water quality offers the opportunity to view the decreasing of chlorine concentration, so that the free residual chlorine dosage can be optimized.

Research paper thumbnail of Determining the optimum number of ground control

The ground control points (GCPs) are used in the process of indirect georeferencing the 15 Unmann... more The ground control points (GCPs) are used in the process of indirect georeferencing the 15 Unmanned Aerial Systems (UAS) images. A minimum of 3 ground control points (GCPs) is 16 required, but increasing the number of GCPs will lead to higher accuracy of the final results. The 17 aim of the study is to provide the answer to the question of how many ground control points are 18 necessary in order to derive high precision results. To obtain the results, an area of about 1 ha has 19 been photographed with a low-cost UAS, namely DJI Phantom 3 Standard at two different heights: 20 28 m and 35 m above ground, the camera being oriented in nadiral position and a number of 50 21 ground control points were measured using a total station. In the first and the second scenario, the 22 UAS images were processed using the Pix4D Mapper Pro software and 3DF Zephyr respectively, 23 by performing a full bundle adjustment process, the number being gradually increased from 3 GCPs 24 to 40. The third tes...

Research paper thumbnail of Contributions on the Centralized Collection of Manure

Environmental Engineering and Management Journal, 2021

This paper outlines certain contributions on the centralized collection and storage of manure, th... more This paper outlines certain contributions on the centralized collection and storage of manure, the building type of storage facility that must be used in order to eliminate the possibilities of spread and infiltration into the soil. Also, the facilities that need to be implemented for the collection of leachates, as well as a method to evaluate the volume of leachate collected from the storage platform, in the case of a rural area locality are addressed. The total built-up area shall be of 1191 m 2 , while the actual storage area shall be of 825 m 2. The entrapped leachate volume was calculated considering the two manure storages pans. The total capacity of the leachate collection tank will be of 145 m 3 .

Research paper thumbnail of Aspects Concerning the Management of Degraded Soils by Compaction

The Bulletin of the Polytechnic Institute of Jassy, Construction. Architecture Section, 2016

This paper intends to highlight the main causes and effects attributable to nature negative proce... more This paper intends to highlight the main causes and effects attributable to nature negative process called: compaction or settlement in some cases depending on the area in which researching takes place. In solving this unfavorable soil phenomenon, in the last half of the twentieth century the focus was on developing new techniques and technologies used in preventing and combating the stocky from natural causes or human land referred in this paper. Thus in this context was reported one of the methods to prevent and to combat this factor such as deep loosening. This process applied to improve influenced in a manner most favorable physicochemical properties and soil hydraulic.

Research paper thumbnail of Monitoring and controlling of process parameters in the biological phase of wastewater treatment

This article presents the methodology for monitoring and controlling the process parameters of th... more This article presents the methodology for monitoring and controlling the process parameters of the biological stage of wastewater treatment, through the monitoring, control, and data acquisition program SCADA. The introduction of the SCADA software in the field of wastewater treatment has appeared with the evolution of treatment technologies and increasing legal requirements for the quality of emissions. The implementation of this program brings significant benefits to wastewater treatment plants and facilitates the control and monitoring of the technological process in the wastewater treatment plant. By using this software, the cost of energy consumption can be reduced, the operating time of a treatment plant equipment can be tracked, time faults of the installations can be detected in the treatment plant, can be drawn up working graphs and tables with data from technological process etc. The present study highlights the kinetics of the treatment process in the biological treatment stage of the Iași City Wastewater Treatment Plant and the usefulness of the research performed.

Research paper thumbnail of Study of Heavy Metal Dynamics in Soil

Environmental Engineering and Management Journal, 2020

The paper covers the results of a study, carried out during 2005 and 2018, regarding the impact o... more The paper covers the results of a study, carried out during 2005 and 2018, regarding the impact of sludge dump of a wastewater treatment plant from Iasi city, Romania, on the soil characteristics. Experimental research was conducted to highlight the evolution of the heavy metal content of both the material in the storage site and the soil in its proximity. The following heavy metal concentrations were analyzed with atomic adsorption spectrometry method: Zn, Ni, Cr, Pb, Co, Cu and Cd. Research has also addressed other physical (particle size composition and soil moisture) and chemical (pH, sludge and soil reaction, organic carbon content, nitric nitrogen concentration, total nitrogen, mobile phosphorus and potassium content) properties that influence the mobility and retention of chemical compounds in the soil. The results of this study showed that the material consisting of sludge, on the depth of 0-20 cm, shows well-developed structural aggregates, with a structure between granules and subangular polyhedra, with a medium level of development. The analyzed material has good hydrophysical properties that give it mechanical and hydronic stability. Following the analyzes carried out during 2005 to 2018, we can say that there has been an increase in the humidity and the zinc content in the soil due to the sludge dump from the wastewater treatment plant in Iasi. Research results can be used as a scientific basis for developing an appropriate soil management system in the study area.

Research paper thumbnail of A GIS-Based Algorithm to Generate a Lidar Pit-Free Canopy Height Model

Present Environment and Sustainable Development, 2017

Lidar has provided significant benefits for forest development and engineering operations and pro... more Lidar has provided significant benefits for forest development and engineering operations and provides a good means to collect information on forest stands. A common analysis using LiDAR data computes the CHM as a difference between DSM and DTM, create a DTM from the ground returns and a DSM from the first returns and subtract the two rasters, but how exactly are generated the DTM and the DSM. Irregular height variations, called data pits are present in the CHM and appear when the first Lidar return is far below the canopy. The purpose of this study is an approach that computes the CHM directly from height-normalized LiDAR points.

Research paper thumbnail of The influence of the compaction process on the oscilation of soil hydrophysical properties from Tătăraşi area

“Ion Ionescu de la Brad” University of Agricultural Sciences and Veterinary Medicine, Iaşi, 2016

Research paper thumbnail of Research on the influence of soil particles shape on the retention capacity of soils from Dancu study area

“Ion Ionescu de la Brad” University of Agricultural Sciences and Veterinary Medicine, Iaşi, 2016

Research paper thumbnail of The study on the possibility of the soil suction simulation study of soils from breazu and dancu areas through the soil parameter estimator software

Research paper thumbnail of Classification and mapping of urban areas based on point clouds from ALS, aerial and satellite images

EGU General Assembly Conference Abstracts, Apr 1, 2019

Research paper thumbnail of The Recent Evolution of the Prut River Channel in the Territorial Administrative Unit of Prisăcani Commune - Iaşi County

Representing a direct response of hydrologic, hydrogeologic, geomorphologic, and anthropic factor... more Representing a direct response of hydrologic, hydrogeologic, geomorphologic, and anthropic factors, the dynamic of river channels has a useful scientific and practical importance, especially for the regions where the rivers play the role of state border. This article presents a detailed analysis of the dynamic of the Prut River channel for the last 125 years, concerning a 26 km sector of the river, which correspond to Prisacani territorial (local) administrative unit (LAU 2 nd order), Iaşi County. This segment can be considered as a representative natural border between Romania and Republic of Moldavia along the middle Prut River course, downstream the Stânca-Costeşti anthropic lake. The work consisted in digitization of a large series topographic maps (1893-1894 edition at 1:50,000 scale, 1940 edition at 1:20,000 scale, the 1949, 1960 and 1985 editions at 1:25,000 scale), various remote sensing images: LANDSAT images for the 1990 and 2000 decades, SENTINEL 1A and 2A images for the year 2015 and 2016, LiDAR DEM (acquired in 2012), and Google Earth® high resolution optical satellite images collection. For the last two years, the channel dynamic was validated and completed using GPS measurements.

Research paper thumbnail of for Physical Characterization of Salinated Soil

The Bulletin of the Polytechnic Institute of Jassy, Construction. Architecture Section, 2015

This paper had been aiming to analyze salinated soils, of the area Osoi-Moreni from the village P... more This paper had been aiming to analyze salinated soils, of the area Osoi-Moreni from the village Prisacani, Iasi city from physical properties point of view of this salinated soils. For this research we had took soils from two places: the first place are currently cultivated with corn (Zea mays), and the second soil place came from an area of uncultivated, which has not suffered work agricultural about seven years. The methods for analysis of physical characteristics of saline soils are important research for the diagnosis, monitoring and quality control saline soils which are used in agricultural.

Research paper thumbnail of Aspecte Privind Dispersia Unor Compuşi Chimici În Sol

Research paper thumbnail of HYDROTECHNICS Tom 55 ( 69 ) , Fascicola 1 , 2010 Models for predicting the gas diffusion coefficient in undisturbed soil

Overall objective of this project is mathematical modeling of diffusion processes, functional sta... more Overall objective of this project is mathematical modeling of diffusion processes, functional status and numerical methods development. This paper includes qualitative study to estimate the gas diffusion coefficient (DP/D0) in undisturbed soils. Based on empirical and numerical models of Penman [1940], Millington and Quirk [1960], Millington and Quirk [1961] and Moldrup [1999] has determined diffusion coefficient variation for different types of soil taken in the study. It was found that soil type, texture, structure, porosity, apparent density are the main factors influencing the diffusion and gas transport in porous media. The project conducted fundamental research on both general diffusion models and analysis models particulare major in science and engineering.

Research paper thumbnail of Quantitative and qualitative studies on hepatitis B antigen. Titer and subtypes in acute virual hepatitis patients and blood donors

Virologie, 1975

Hepatitis B antigen (HB Ag) titer and subtype were determined in blood samples obtained from 270 ... more Hepatitis B antigen (HB Ag) titer and subtype were determined in blood samples obtained from 270 HB Ag-positive acute viral hepatitis (AVH) patients, as well as in 100 HB Ag-positive blood donors. The percentage distribution of the HB Ag titer shows a shift towards lower titers in the case of "healthy carriers". In both AVH patients and blood donors the "ay" antigenic subtype was found to be predominant.

Research paper thumbnail of Investiganting Correlation LST and Vegetation Indices Using Landsat Images for the Warmest Month: A Case Study of Iasi County

Annals of Valahia University of Targoviste, Geographical Series, 2018

In this paper is investigating correlation between land surface temperature and vegetation indice... more In this paper is investigating correlation between land surface temperature and vegetation indices (Normalized Difference Vegetation Index - NDVI, Enhanced Vegetation Index 2 - EVI2 and Modified Soil Adjusted Vegetation Index - MSAVI) using Landsat images for august, the warmest month, for study area. Iaşi county is considered as study area in this research. Study Area is geographically situated on latitude 46°48'N to 47°35'N and longitude 26°29'E to 28°07'E. Land surface temperature (LST) can be used to define the temperature distribution at local, regional and global scale. First use of LST was in climate change models. Also LST is use to define the problems associated with the environment. A Vegetation Indices (VI) is a spectral transformation what suppose spatial-temporal intercomparisons of terrestrial photosynthetic dynamics and canopy structural variations. Landsat5 TM, Landsat7 ETM+ and Landsat8 OLI, all data were used in this study for modeling. Landsat imag...

Research paper thumbnail of Recognition and Determination of Hydrodynamic Deficiencies in the Bioreactors of a Real Wastewater Treatment Plant by a Comprehensive Approach: Live Analysis Using Computational Fluid Dynamics

Environmental Engineering and Management Journal, 2021

The paper presents the results of research conducted on the technological analysis of bioreactors... more The paper presents the results of research conducted on the technological analysis of bioreactors operated at the Iasi wastewater treatment plant (WWTP) and based on them, some proposals for the intervention works needed to improve the technological process, proposals that were subsequently developed. The Iasi WWTP process is using, in the advanced biological stage, an artificial biological treatment with an activated sludge aerobic process, with continuous recirculation. The treatment process scheme is of A2/O type, including a nitrification-denitrification process, so named because it includes 3 distinct areas (anaerobic, anoxic for denitrification and oxic for nitrification). The biological treatment processes are complex, and in the development of the processes intervene physical, hydraulic, chemical and biochemical phenomena. The role of active sludge bioreactors is to remove the nonsedimentable organic compounds, to stabilize sludge organic matter, and to decrease the load of nitrogen and phosphorus-based nutrients from wastewater. Therefore, to gain a higher efficiency and to reach lower operating costs, there is a need for a more uniform flow and distribution of the poly-phase environment, with uniform aeration and a constant transit time for aeration tanks. The parameters being studied within the research program were: flow regime in bioreactors, transient flow distribution in bioreactors, retention time in bioreactors, air distribution in the aerobic area, the state of active sludge bioreactors, reliability of measuring and control devices and all related facilities.

Research paper thumbnail of The Impact of Sludge Storage on the Soil. Case Study: Tomesti Deposit in Iasi County, Romania

Environmental Engineering and Management Journal, 2021

The study was conducted in the sludge storage area in Tomesti, Iasi County. The sludge from the w... more The study was conducted in the sludge storage area in Tomesti, Iasi County. The sludge from the wastewater treatment process was stored in the Tomesti lagoon, which increased the pollutant concentrations in the soil. The goal of the present paper was to study the impact of sludge storage on the Tomesti soil by analyzing the contents of salts, heavy metals and microbiological loads (total coliform bacteria, enterococci, Escherichia coli, Clostridium perfringens, Salmonella spp). The total concentration of heavy metals in soil is a relevant indicator on the risk to human health and environment. Growing plants in polluted areas can be a remedial solution and can serve as an alternative tool in sustainable agriculture. Plants can influence the accumulation of heavy metals in soils, either by decreasing or increasing their accumulation. Following the carried analyses, we can say that some physical and chemical properties of the sludge were propagated to the soil on which the sludge is stored. Thus, the moisture of the soil located below the sludge layer increased by up to 20%, compared to the humidity of the neighboring soil, that is not influenced by the presence of sludge. It was also an adsorption medium for numerous cations and anions. From the group of tested heavy metals (Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, Zn), the only element present at polluting level is zinc. In the first soil horizon on which the sludge is stored, the zinc contents exceed 10.8 times the maximum permissible limit value, and for the neighboring soil this is 1.6 times. From a bacteriological point of view, the soil beneath the sludge lagoon is loaded with Salmonella genus bacterial colonies.

Research paper thumbnail of The Impact of the Compaction Process on the Variation of Soil Hydrophysical Properties from Breazu and Dancu Areas

The Bulletin of the Polytechnic Institute of Jassy, Construction. Architecture Section, 2016

The present study wants to highlight the influence it has compacting process on the variation of ... more The present study wants to highlight the influence it has compacting process on the variation of hydrophysical.properties of three types of soil In solving this unfavorable soil phenomenon this paper tries to noting the main effects exerted by the compaction process on the hydrophysical.properties distribution in time and space by applying laboratory methods for determining the physical and hydraulic properties of soils in Breazu and Dancu areas. Principal physical characteristics were determined: soil density, soil bulk density, texture and soil porosity. Hydraulic properties analyzed in order to mark the variation of water regime were: hydraulic conductivity (saturated and unsaturated) and soil suction. All these basic attributes of soil were determined in laboratory methods of applying wish traced internationally.

Research paper thumbnail of Modeling the Chlorine-Conveying Process Within a Drinking Water Distribution Network

Environmental Engineering and Management Journal, 2021

The distribution network is the last component of a water supply system in which potable water mu... more The distribution network is the last component of a water supply system in which potable water must be provided to the consumer. The presence of chlorine in drinking water is a necessity and a guarantee that water is microbiologically compliant. The study was carried out by means of the Epanet 2.0 program on a future distribution network in the hilly area, in which a simulation period of 4 days was considered. The water quality analysis was performed using the flow rates resulting from the hydraulic simulation. To track the propagation of the contaminant through network pipelines, a maximum permissible value of 0.5 mg/L, entered during the entire simulation period, was considered. The reactions that occur in the bulk flow, were modeled by means of a 1st and 2nd order a decomposition law. The obtained values of the free residual chlorine concentration showed that during the 96 h of simulation, there were certain pipelines in which the chlorine concentration did not meet the minimum allowable limit of 0.1 mg/L. Modeling water quality offers the opportunity to view the decreasing of chlorine concentration, so that the free residual chlorine dosage can be optimized.

Research paper thumbnail of Determining the optimum number of ground control

The ground control points (GCPs) are used in the process of indirect georeferencing the 15 Unmann... more The ground control points (GCPs) are used in the process of indirect georeferencing the 15 Unmanned Aerial Systems (UAS) images. A minimum of 3 ground control points (GCPs) is 16 required, but increasing the number of GCPs will lead to higher accuracy of the final results. The 17 aim of the study is to provide the answer to the question of how many ground control points are 18 necessary in order to derive high precision results. To obtain the results, an area of about 1 ha has 19 been photographed with a low-cost UAS, namely DJI Phantom 3 Standard at two different heights: 20 28 m and 35 m above ground, the camera being oriented in nadiral position and a number of 50 21 ground control points were measured using a total station. In the first and the second scenario, the 22 UAS images were processed using the Pix4D Mapper Pro software and 3DF Zephyr respectively, 23 by performing a full bundle adjustment process, the number being gradually increased from 3 GCPs 24 to 40. The third tes...

Research paper thumbnail of Contributions on the Centralized Collection of Manure

Environmental Engineering and Management Journal, 2021

This paper outlines certain contributions on the centralized collection and storage of manure, th... more This paper outlines certain contributions on the centralized collection and storage of manure, the building type of storage facility that must be used in order to eliminate the possibilities of spread and infiltration into the soil. Also, the facilities that need to be implemented for the collection of leachates, as well as a method to evaluate the volume of leachate collected from the storage platform, in the case of a rural area locality are addressed. The total built-up area shall be of 1191 m 2 , while the actual storage area shall be of 825 m 2. The entrapped leachate volume was calculated considering the two manure storages pans. The total capacity of the leachate collection tank will be of 145 m 3 .

Research paper thumbnail of Aspects Concerning the Management of Degraded Soils by Compaction

The Bulletin of the Polytechnic Institute of Jassy, Construction. Architecture Section, 2016

This paper intends to highlight the main causes and effects attributable to nature negative proce... more This paper intends to highlight the main causes and effects attributable to nature negative process called: compaction or settlement in some cases depending on the area in which researching takes place. In solving this unfavorable soil phenomenon, in the last half of the twentieth century the focus was on developing new techniques and technologies used in preventing and combating the stocky from natural causes or human land referred in this paper. Thus in this context was reported one of the methods to prevent and to combat this factor such as deep loosening. This process applied to improve influenced in a manner most favorable physicochemical properties and soil hydraulic.

Research paper thumbnail of Monitoring and controlling of process parameters in the biological phase of wastewater treatment

This article presents the methodology for monitoring and controlling the process parameters of th... more This article presents the methodology for monitoring and controlling the process parameters of the biological stage of wastewater treatment, through the monitoring, control, and data acquisition program SCADA. The introduction of the SCADA software in the field of wastewater treatment has appeared with the evolution of treatment technologies and increasing legal requirements for the quality of emissions. The implementation of this program brings significant benefits to wastewater treatment plants and facilitates the control and monitoring of the technological process in the wastewater treatment plant. By using this software, the cost of energy consumption can be reduced, the operating time of a treatment plant equipment can be tracked, time faults of the installations can be detected in the treatment plant, can be drawn up working graphs and tables with data from technological process etc. The present study highlights the kinetics of the treatment process in the biological treatment stage of the Iași City Wastewater Treatment Plant and the usefulness of the research performed.

Research paper thumbnail of Study of Heavy Metal Dynamics in Soil

Environmental Engineering and Management Journal, 2020

The paper covers the results of a study, carried out during 2005 and 2018, regarding the impact o... more The paper covers the results of a study, carried out during 2005 and 2018, regarding the impact of sludge dump of a wastewater treatment plant from Iasi city, Romania, on the soil characteristics. Experimental research was conducted to highlight the evolution of the heavy metal content of both the material in the storage site and the soil in its proximity. The following heavy metal concentrations were analyzed with atomic adsorption spectrometry method: Zn, Ni, Cr, Pb, Co, Cu and Cd. Research has also addressed other physical (particle size composition and soil moisture) and chemical (pH, sludge and soil reaction, organic carbon content, nitric nitrogen concentration, total nitrogen, mobile phosphorus and potassium content) properties that influence the mobility and retention of chemical compounds in the soil. The results of this study showed that the material consisting of sludge, on the depth of 0-20 cm, shows well-developed structural aggregates, with a structure between granules and subangular polyhedra, with a medium level of development. The analyzed material has good hydrophysical properties that give it mechanical and hydronic stability. Following the analyzes carried out during 2005 to 2018, we can say that there has been an increase in the humidity and the zinc content in the soil due to the sludge dump from the wastewater treatment plant in Iasi. Research results can be used as a scientific basis for developing an appropriate soil management system in the study area.

Research paper thumbnail of A GIS-Based Algorithm to Generate a Lidar Pit-Free Canopy Height Model

Present Environment and Sustainable Development, 2017

Lidar has provided significant benefits for forest development and engineering operations and pro... more Lidar has provided significant benefits for forest development and engineering operations and provides a good means to collect information on forest stands. A common analysis using LiDAR data computes the CHM as a difference between DSM and DTM, create a DTM from the ground returns and a DSM from the first returns and subtract the two rasters, but how exactly are generated the DTM and the DSM. Irregular height variations, called data pits are present in the CHM and appear when the first Lidar return is far below the canopy. The purpose of this study is an approach that computes the CHM directly from height-normalized LiDAR points.