Hendra Pachri - Academia.edu (original) (raw)
Papers by Hendra Pachri
Flash flood disaster occurred within the City of Garut, West Java, Indonesia, on 20 th September ... more Flash flood disaster occurred within the City of Garut, West Java, Indonesia, on 20 th September 2016, which caused many casualties and damages. Flood model could be performed to model the already-occurring disaster, as well as to depict future events that may occur to overcome any potential disasters, where the inundation flood model depicted the element at risk. In order to assist the analysis for the damages occurred, image mining could be used as part of the approach, where online media was utilized as well. The image mining resulted information about building damages caused by the flood. Afterwards, the physical vulnerability (buildings/residents) model could be further performed. Finally, the relationship between vulnerability and the flood inundation were portrayed. The resulted physical vulnerability model showed that larger height of the flood water caused higher degree of loss of the building, in which portrayed the need for total rebuild of houses as well. Considering ava...
International Journal of Renewable Energy Research, 2020
Providing information comprehensively regarding drivers for household electricity use is importan... more Providing information comprehensively regarding drivers for household electricity use is important for power system operation and more realistic planning for energy conservation policies. This paper has focus to provide information related to household electricity consumption and behaviour of users in Makassar, Indonesia. For this purpose, a questionnaire was developed for survey to get data from users such as family characteristics, house building, owned energy efficient appliances (EEA), user behaviour in using appliances, obstacles in practising energy saving, etcetera. To derive more information, obtained data were also analyzed using regression approach. Some important information from survey results are demand for larger installed electricity power capacity (IEPC) is increased and mainly for house with IEPC 900 VA. For EEA, lamp, refrigerator, and air-conditioner (AC) are mostly owned by respondents. Obstacles in practicing daily electricity saving include such as users do not...
International Journal of Engineering, 2016
Sedimentation rate in Lake Tempe is a serious problem faced by the government and local communiti... more Sedimentation rate in Lake Tempe is a serious problem faced by the government and local communities due to the high sediment transport from upstream of several rivers that flow into Lake Tempe. This study aims to determine the source of the rock material based on analysis of heavy mineral sediment. The research area is located at the estuary of Bila River in Sidenreng Rappang Regency. The method used is test pit and surface sampling. Laboratory analyzes were performed is the analysis of grain size (granulometry), heavy mineral analysis (heavy mineral separation) and microscopic analysis. There are 14 types of heavy minerals found in the Tempe Lake namely: zircon, tourmaline, rutile (ZTR) as ultra stable mineral. The less stable minerals are epidote; and others are olivine, hipersten, augite, hornblende, biotite, casiterit,, brookit, apatite, magnetite and iron oxide. Source rocks of the minerals are interpreted from igneous and volcanic rocks of acidic to intermediate type.
Flash flood disaster occurred within the City of Garut, West Java, Indonesia, on 20 th September ... more Flash flood disaster occurred within the City of Garut, West Java, Indonesia, on 20 th September 2016, which caused many casualties and damages. Flood model could be performed to model the already-occurring disaster, as well as to depict future events that may occur to overcome any potential disasters, where the inundation flood model depicted the element at risk. In order to assist the analysis for the damages occurred, image mining could be used as part of the approach, where online media was utilized as well. The image mining resulted information about building damages caused by the flood. Afterwards, the physical vulnerability (buildings/residents) model could be further performed. Finally, the relationship between vulnerability and the flood inundation were portrayed. The resulted physical vulnerability model showed that larger height of the flood water caused higher degree of loss of the building, in which portrayed the need for total rebuild of houses as well. Considering ava...
Recently, comprehensive sediment management is necessary to solve sediment problem in whole river... more Recently, comprehensive sediment management is necessary to solve sediment problem in whole river basin. However, sediment discharge in river has been measured in only dam reservoirs, and sediment production from tributary and factors on sediment transport are not clearly in most cases. In this study, we conducted sampling of sediment in Nanatsuyamakawa River, to clarify the relationship of sediment chemical composition and the geology. Nanatsuyamakawa River is one of the tributaries that supplies more sediment to mainstream than other tributaries in Mimikawa River Basin of Miyazaki Prefecture. It is also necessary mission to clarify sediment volume from tributary. First, we analyzed landform of the study area by GIS to select sampling locations in which sediment will be trapped due to the morphology of river-bed such as knickpoint, steps and pools etc. Chemical compositions of the sediment were revealed by XRF, and were analyzed statistically. As a result, the chemical composition ...
Water as a natural resource is the most important part for humans to continue their life. One exa... more Water as a natural resource is the most important part for humans to continue their life. One example of the vital role of water resources for human activities is to fulfill food through agriculture and plantations. The availability of water needs for agricultural productivity is certainly an important study to maintain supply capacity and avoid crises in agricultural and plantation foodstuffs. As mandated by the Water Resources Law, the utilization of water resources is aimed at sustainably utilizing water resources by prioritizing the fulfillment of the basic needs of the community fairly. For the sake of the continuity of human life, water resources must be managed properly by paying attention to and protecting the environment. Almost not all the agricultural and plantation areas in the Planting area have irrigation channels that utilize surface water. Consequently, agricultural production does not reach maximum results, because its water needs are very dependent on rainwater. On...
On July, 2003, following a short duration of heavy rainfall, a slope failure disaster occurred in... more On July, 2003, following a short duration of heavy rainfall, a slope failure disaster occurred in the Sangun Mountain area, Fukuoka Prefecture, Japan. This disaster was triggered by a landslide. In order to assess the slope failure hazard potential in the future, the study of probability of slope failure is critical. This paper presents the integrating of deterministic and statistical approach to assess the performance of the predicted results based on a factor of safety (FS) of whole slope units. Therefore, the spatial probabilistic modeling of slope failures using a combined Geographic Information System (GIS), 3D slope stability analysis, and a Monte Carlo simulation approach is applied in the slope failures-prone area of Sangun mountain area, Fukuoka Prefecture. Morphological aspects (elevation, slope aspect, slope gradient) are extracted from airborne laser survey data (LiDAR data) in each 5 m-grid that provided by local governments in Japan were assumed ground elevation to cre...
IOP Conference Series: Earth and Environmental Science
Deforestation is a permanent change of forest cover area to non-forest cover area. Social factors... more Deforestation is a permanent change of forest cover area to non-forest cover area. Social factors contribute more to the occurrence of deforestation, so this study was directed to examine the social factors that drive deforestation. Research location selected based on the key vulnerability of deforestation profiles. This study only used moderately vulnerability and vulnerability profile. Data analysis in this research using PCA (Principal Component Analysis) Method. The results explained that the Spatial Deforestation Model in South Sulawesi and West Sulawesi have differences based on the vulnerability profile. The dominant deforestation profiles affected were population density, productive age and employment. Population density affects deforestation because the site is always experiencing an increase in population and is not balanced with the extent of its territory, especially on vulnerable profiles. Productive age is very influential and increasing. The employment is also one of ...
IOP Conference Series: Earth and Environmental Science
Hambalang area is one of the regions susceptible to landslide events. This is due to unstable geo... more Hambalang area is one of the regions susceptible to landslide events. This is due to unstable geological conditions and high rainfall. Administratively, research area included in Citeureup District, Bogor Regency, West Java Province. Astronomically, research area is located at the coordinates 106°51’30” - 106°53’30” East Longitude and 06°32’ - 06°34’ South Latitude. This study aims to determine the geological conditions of the study area and conduct susceptibility zoning in the Hambalang area using the method of Frequency Ratio and Logistic Regression. The geological conditions of the study area consist of geomorphology in the form of corrugated and flatland morphological units, stratigraphy consisting of claystone units, andesite units and alluvial units, and the structure of the Sumurbatu anticline. The parameters used to analyze the causes of landslide are slope, geology, rainfall, soil type, land use and distance from rivers. There were 19 landslide events identified in the stud...
Journal of Physics: Conference Series
One of issues in the power systems is how to meet electricity load from year to year. Therefore, ... more One of issues in the power systems is how to meet electricity load from year to year. Therefore, conducting future electricity load analysis as a basis to develop needed new power plants including expansion of electricity network is important. This paper aims to investigate saturation period of electricity consumption in Makassar, Indonesia using logistic curve approach. To analyze more detail phases of electricity consumption growth, logistic curve models for each service area in Makassar (north, south, east, and west region) were also composed and compared using data from year 2000 to 2015. Besides that, power load density was also investigated. Prediction results shown electricity energy consumption in Makassar will enter into saturation condition from year 2033 with consumption volume is 4,748 million kWh. Consumption growth percentage decreased by year which is around 0.06% in year 2050. Other main results shown saturation phase for the four observed regions occurred in the different years, and load density level is 5.226 MVA/km 2 in year 2015. Presented information useful in developing more effective power grid in Makassar to keep optimal electricity service to consumers in the future and management.
Journal of Geological Resource and Engineering, 2015
Recently, the contributions of slope failures have been difficult to quantify over the time scale... more Recently, the contributions of slope failures have been difficult to quantify over the time scales of the sediment concentrations in Sangun catchment area, Fukuoka Prefecture. Therefore, to clarify the sources of the sediment mixing in the catchment is important and becomes considering in the future that related the slope failures occurrence. This paper describes how cosmogenic nuclide methods have provided information about the geomorphic process by utilizing 10 Be (half-life = 1.5 ma), measuring the 10 Be/ 9 Be ratio, and quantifying 10 Be concentration. The sampled sediments were derived from throughout a drainage basin. To measure the 10 Be/ 9 Be ratios in the sediments, quartz minerals were collected from the sediment and then Be was extracted from the quartz. The 10 Be/ 9 Be ratios were measured by AMS. We assume that the cosmogenic nuclide concentrations stored in the sediment of a river can increase or decrease, depending on the amount of mixing of sediments during transport through the fluvial system. As results, the 10 Be concentrations have been calculated to determine the short term sediment mixing rate in the catchment area. Therefore, the relationship between the morphometrics of the drainage basin, the sediment concentration by 10 Be analysis and the contribution of landslides to landscape changes over timescales of several years have been investigated in Sangun catchment area.
International Journal of Geosciences, 2015
Shallow slope failure is often induced by rainfall infiltration in a soil mantle overlying a less... more Shallow slope failure is often induced by rainfall infiltration in a soil mantle overlying a less permeable bedrock. Soil depth is an important input parameter in slope stability analysis. This paper provides the spatial variation of soil depth and the occurrence of slope failure in Sangun mountains area. The spatial pattern of soil depth was simulated by proses based model using airborne laser survey data (LiDAR data) and Geographic Information System (GIS) function. As a function for soil production, we use in the study area a numerical model developed by Dietrich et al. (1995) to predict the local spatial variation of the depth of soil. The soil depth data measured at 20 locations that represent morphological variability are used as a sample data set to test the model results. Furthermore, the soil depth variations are compared to the slope failure distribution in the whole area. Slope failure locations in the study area are identified from interpretation of aerial photographs and field surveys. Fifty-five of slope failures are considered for slope failure hazard analysis. Therefore, the slope failures occur more frequently at soil depth intervals in the ranged from 1.01 m to 1.5 m.
Procedia Earth and Planetary Science, 2013
Engineering Geology for Society and Territory - Volume 3, 2014
How much is known about the relationship between topography and sediment dynamic in mountainous c... more How much is known about the relationship between topography and sediment dynamic in mountainous catchments? A previous numerical process-based study, with a high-resolution digital terrain model (DTM), reported a quantitative relationship between annual precipitation and river incision. However, the ability to predict sediment transport within mountainous streams is still needed in order to integrate sediment management in rivers. In this study, we focus on the relationship between topography and hydrologic properties in temperate mountainous catchments as a fundamental study to connect topography and sediment movement. The studied mountain catchments located in northern Kyushu, Japan, are composed mainly of Mesozoic granitic rocks. In the catchments, three terrain parameters were determined with topographic analysis using a process-based model and airborne LiDAR survey data. Hydrological measurements such as electric conductivity and water discharges were also carried out on the streams. One of the studied terrain parameters, D/K, shows a bimodal distribution indicating a few groups in our study area. The values also show a relationship with water discharges. These results show that the basin topography would have been formed through similar surface processes and correlate with the current hydrological environment. This process-based modeling could be an effective tool to quantitatively analyze short-term impacts of climate on topography.
Flash flood disaster occurred within the City of Garut, West Java, Indonesia, on 20 th September ... more Flash flood disaster occurred within the City of Garut, West Java, Indonesia, on 20 th September 2016, which caused many casualties and damages. Flood model could be performed to model the already-occurring disaster, as well as to depict future events that may occur to overcome any potential disasters, where the inundation flood model depicted the element at risk. In order to assist the analysis for the damages occurred, image mining could be used as part of the approach, where online media was utilized as well. The image mining resulted information about building damages caused by the flood. Afterwards, the physical vulnerability (buildings/residents) model could be further performed. Finally, the relationship between vulnerability and the flood inundation were portrayed. The resulted physical vulnerability model showed that larger height of the flood water caused higher degree of loss of the building, in which portrayed the need for total rebuild of houses as well. Considering ava...
International Journal of Renewable Energy Research, 2020
Providing information comprehensively regarding drivers for household electricity use is importan... more Providing information comprehensively regarding drivers for household electricity use is important for power system operation and more realistic planning for energy conservation policies. This paper has focus to provide information related to household electricity consumption and behaviour of users in Makassar, Indonesia. For this purpose, a questionnaire was developed for survey to get data from users such as family characteristics, house building, owned energy efficient appliances (EEA), user behaviour in using appliances, obstacles in practising energy saving, etcetera. To derive more information, obtained data were also analyzed using regression approach. Some important information from survey results are demand for larger installed electricity power capacity (IEPC) is increased and mainly for house with IEPC 900 VA. For EEA, lamp, refrigerator, and air-conditioner (AC) are mostly owned by respondents. Obstacles in practicing daily electricity saving include such as users do not...
International Journal of Engineering, 2016
Sedimentation rate in Lake Tempe is a serious problem faced by the government and local communiti... more Sedimentation rate in Lake Tempe is a serious problem faced by the government and local communities due to the high sediment transport from upstream of several rivers that flow into Lake Tempe. This study aims to determine the source of the rock material based on analysis of heavy mineral sediment. The research area is located at the estuary of Bila River in Sidenreng Rappang Regency. The method used is test pit and surface sampling. Laboratory analyzes were performed is the analysis of grain size (granulometry), heavy mineral analysis (heavy mineral separation) and microscopic analysis. There are 14 types of heavy minerals found in the Tempe Lake namely: zircon, tourmaline, rutile (ZTR) as ultra stable mineral. The less stable minerals are epidote; and others are olivine, hipersten, augite, hornblende, biotite, casiterit,, brookit, apatite, magnetite and iron oxide. Source rocks of the minerals are interpreted from igneous and volcanic rocks of acidic to intermediate type.
Flash flood disaster occurred within the City of Garut, West Java, Indonesia, on 20 th September ... more Flash flood disaster occurred within the City of Garut, West Java, Indonesia, on 20 th September 2016, which caused many casualties and damages. Flood model could be performed to model the already-occurring disaster, as well as to depict future events that may occur to overcome any potential disasters, where the inundation flood model depicted the element at risk. In order to assist the analysis for the damages occurred, image mining could be used as part of the approach, where online media was utilized as well. The image mining resulted information about building damages caused by the flood. Afterwards, the physical vulnerability (buildings/residents) model could be further performed. Finally, the relationship between vulnerability and the flood inundation were portrayed. The resulted physical vulnerability model showed that larger height of the flood water caused higher degree of loss of the building, in which portrayed the need for total rebuild of houses as well. Considering ava...
Recently, comprehensive sediment management is necessary to solve sediment problem in whole river... more Recently, comprehensive sediment management is necessary to solve sediment problem in whole river basin. However, sediment discharge in river has been measured in only dam reservoirs, and sediment production from tributary and factors on sediment transport are not clearly in most cases. In this study, we conducted sampling of sediment in Nanatsuyamakawa River, to clarify the relationship of sediment chemical composition and the geology. Nanatsuyamakawa River is one of the tributaries that supplies more sediment to mainstream than other tributaries in Mimikawa River Basin of Miyazaki Prefecture. It is also necessary mission to clarify sediment volume from tributary. First, we analyzed landform of the study area by GIS to select sampling locations in which sediment will be trapped due to the morphology of river-bed such as knickpoint, steps and pools etc. Chemical compositions of the sediment were revealed by XRF, and were analyzed statistically. As a result, the chemical composition ...
Water as a natural resource is the most important part for humans to continue their life. One exa... more Water as a natural resource is the most important part for humans to continue their life. One example of the vital role of water resources for human activities is to fulfill food through agriculture and plantations. The availability of water needs for agricultural productivity is certainly an important study to maintain supply capacity and avoid crises in agricultural and plantation foodstuffs. As mandated by the Water Resources Law, the utilization of water resources is aimed at sustainably utilizing water resources by prioritizing the fulfillment of the basic needs of the community fairly. For the sake of the continuity of human life, water resources must be managed properly by paying attention to and protecting the environment. Almost not all the agricultural and plantation areas in the Planting area have irrigation channels that utilize surface water. Consequently, agricultural production does not reach maximum results, because its water needs are very dependent on rainwater. On...
On July, 2003, following a short duration of heavy rainfall, a slope failure disaster occurred in... more On July, 2003, following a short duration of heavy rainfall, a slope failure disaster occurred in the Sangun Mountain area, Fukuoka Prefecture, Japan. This disaster was triggered by a landslide. In order to assess the slope failure hazard potential in the future, the study of probability of slope failure is critical. This paper presents the integrating of deterministic and statistical approach to assess the performance of the predicted results based on a factor of safety (FS) of whole slope units. Therefore, the spatial probabilistic modeling of slope failures using a combined Geographic Information System (GIS), 3D slope stability analysis, and a Monte Carlo simulation approach is applied in the slope failures-prone area of Sangun mountain area, Fukuoka Prefecture. Morphological aspects (elevation, slope aspect, slope gradient) are extracted from airborne laser survey data (LiDAR data) in each 5 m-grid that provided by local governments in Japan were assumed ground elevation to cre...
IOP Conference Series: Earth and Environmental Science
Deforestation is a permanent change of forest cover area to non-forest cover area. Social factors... more Deforestation is a permanent change of forest cover area to non-forest cover area. Social factors contribute more to the occurrence of deforestation, so this study was directed to examine the social factors that drive deforestation. Research location selected based on the key vulnerability of deforestation profiles. This study only used moderately vulnerability and vulnerability profile. Data analysis in this research using PCA (Principal Component Analysis) Method. The results explained that the Spatial Deforestation Model in South Sulawesi and West Sulawesi have differences based on the vulnerability profile. The dominant deforestation profiles affected were population density, productive age and employment. Population density affects deforestation because the site is always experiencing an increase in population and is not balanced with the extent of its territory, especially on vulnerable profiles. Productive age is very influential and increasing. The employment is also one of ...
IOP Conference Series: Earth and Environmental Science
Hambalang area is one of the regions susceptible to landslide events. This is due to unstable geo... more Hambalang area is one of the regions susceptible to landslide events. This is due to unstable geological conditions and high rainfall. Administratively, research area included in Citeureup District, Bogor Regency, West Java Province. Astronomically, research area is located at the coordinates 106°51’30” - 106°53’30” East Longitude and 06°32’ - 06°34’ South Latitude. This study aims to determine the geological conditions of the study area and conduct susceptibility zoning in the Hambalang area using the method of Frequency Ratio and Logistic Regression. The geological conditions of the study area consist of geomorphology in the form of corrugated and flatland morphological units, stratigraphy consisting of claystone units, andesite units and alluvial units, and the structure of the Sumurbatu anticline. The parameters used to analyze the causes of landslide are slope, geology, rainfall, soil type, land use and distance from rivers. There were 19 landslide events identified in the stud...
Journal of Physics: Conference Series
One of issues in the power systems is how to meet electricity load from year to year. Therefore, ... more One of issues in the power systems is how to meet electricity load from year to year. Therefore, conducting future electricity load analysis as a basis to develop needed new power plants including expansion of electricity network is important. This paper aims to investigate saturation period of electricity consumption in Makassar, Indonesia using logistic curve approach. To analyze more detail phases of electricity consumption growth, logistic curve models for each service area in Makassar (north, south, east, and west region) were also composed and compared using data from year 2000 to 2015. Besides that, power load density was also investigated. Prediction results shown electricity energy consumption in Makassar will enter into saturation condition from year 2033 with consumption volume is 4,748 million kWh. Consumption growth percentage decreased by year which is around 0.06% in year 2050. Other main results shown saturation phase for the four observed regions occurred in the different years, and load density level is 5.226 MVA/km 2 in year 2015. Presented information useful in developing more effective power grid in Makassar to keep optimal electricity service to consumers in the future and management.
Journal of Geological Resource and Engineering, 2015
Recently, the contributions of slope failures have been difficult to quantify over the time scale... more Recently, the contributions of slope failures have been difficult to quantify over the time scales of the sediment concentrations in Sangun catchment area, Fukuoka Prefecture. Therefore, to clarify the sources of the sediment mixing in the catchment is important and becomes considering in the future that related the slope failures occurrence. This paper describes how cosmogenic nuclide methods have provided information about the geomorphic process by utilizing 10 Be (half-life = 1.5 ma), measuring the 10 Be/ 9 Be ratio, and quantifying 10 Be concentration. The sampled sediments were derived from throughout a drainage basin. To measure the 10 Be/ 9 Be ratios in the sediments, quartz minerals were collected from the sediment and then Be was extracted from the quartz. The 10 Be/ 9 Be ratios were measured by AMS. We assume that the cosmogenic nuclide concentrations stored in the sediment of a river can increase or decrease, depending on the amount of mixing of sediments during transport through the fluvial system. As results, the 10 Be concentrations have been calculated to determine the short term sediment mixing rate in the catchment area. Therefore, the relationship between the morphometrics of the drainage basin, the sediment concentration by 10 Be analysis and the contribution of landslides to landscape changes over timescales of several years have been investigated in Sangun catchment area.
International Journal of Geosciences, 2015
Shallow slope failure is often induced by rainfall infiltration in a soil mantle overlying a less... more Shallow slope failure is often induced by rainfall infiltration in a soil mantle overlying a less permeable bedrock. Soil depth is an important input parameter in slope stability analysis. This paper provides the spatial variation of soil depth and the occurrence of slope failure in Sangun mountains area. The spatial pattern of soil depth was simulated by proses based model using airborne laser survey data (LiDAR data) and Geographic Information System (GIS) function. As a function for soil production, we use in the study area a numerical model developed by Dietrich et al. (1995) to predict the local spatial variation of the depth of soil. The soil depth data measured at 20 locations that represent morphological variability are used as a sample data set to test the model results. Furthermore, the soil depth variations are compared to the slope failure distribution in the whole area. Slope failure locations in the study area are identified from interpretation of aerial photographs and field surveys. Fifty-five of slope failures are considered for slope failure hazard analysis. Therefore, the slope failures occur more frequently at soil depth intervals in the ranged from 1.01 m to 1.5 m.
Procedia Earth and Planetary Science, 2013
Engineering Geology for Society and Territory - Volume 3, 2014
How much is known about the relationship between topography and sediment dynamic in mountainous c... more How much is known about the relationship between topography and sediment dynamic in mountainous catchments? A previous numerical process-based study, with a high-resolution digital terrain model (DTM), reported a quantitative relationship between annual precipitation and river incision. However, the ability to predict sediment transport within mountainous streams is still needed in order to integrate sediment management in rivers. In this study, we focus on the relationship between topography and hydrologic properties in temperate mountainous catchments as a fundamental study to connect topography and sediment movement. The studied mountain catchments located in northern Kyushu, Japan, are composed mainly of Mesozoic granitic rocks. In the catchments, three terrain parameters were determined with topographic analysis using a process-based model and airborne LiDAR survey data. Hydrological measurements such as electric conductivity and water discharges were also carried out on the streams. One of the studied terrain parameters, D/K, shows a bimodal distribution indicating a few groups in our study area. The values also show a relationship with water discharges. These results show that the basin topography would have been formed through similar surface processes and correlate with the current hydrological environment. This process-based modeling could be an effective tool to quantitatively analyze short-term impacts of climate on topography.