jamshid yarahmadi - Academia.edu (original) (raw)
Papers by jamshid yarahmadi
Open Journal of Geology, 2017
Springer, 2021
Land evaluation based on its characteristics is a criterion for the proper use of land potential.... more Land evaluation based on its characteristics is a criterion for the proper use of land potential. The high benefit and low water requirement of pistachio has significantly increased its cultivation area in Iran. The objective of this study was to evaluate the suitability of lands for pistachio cultivation based on climatic variables in four provinces, which located in northwestern part of Iran. The climatic requirements of pistachio were specified based on its phenological information. Then, the suitability map of pistachio cultivation zones, spatially modeled in GIS environment based on long term of meteorological data. Subsequently, the results were verified due to field survey and interviews with farmers. The results showed study area classified into three categories from suitable (class S1), moderate suitable (S2), and non-suitable (class N) based on FAO land capability guidelines. So, accuracy of suitability map was validated by overlaying of spatial information of existing pistachio orchards. The results indicated that 33, 33.4, 60, and 12.4% of the East Azerbaijan, West Azerbaijan, Kurdistan, and Ardabil provinces are suitable for pistachio cultivation (class S1), respectively, while the area of unsuitable class (class N) in these provinces was 40, 34.7, 22.7, and 62%, respectively. It was found that the temperature and relative humidity during pollination and growth periods are the main limiting factors for construction of pistachio orchards. The obtained maps can be used as a guide to prevent the planting of pistachios in unsuitable areas and consequently save water consumption in drought conditions.
ECOPERSIA, Sep 10, 2021
In forest lands, the stream channels receive the highest amount of sediment during road construct... more In forest lands, the stream channels receive the highest amount of sediment during road construction activities due to removal of vegetation cover from road surface, cut-slope, fill-slope, and ditch areas. Sediment delivered from a road section to streams causes serious damages on water resources and aquatic life. Performing revegetation in cut-slope and fill-slope reduce sediment yield from a road section; however, road surface and ditch continue to deliver considerable amount of sediment to the streams. Therefore, accurate prediction of sediment yield from existing road network can be very critical. In order to estimate average sediment yield, several sediment prediction models have been developed based on empirical relationships between various road erosion factors. In this study, average annual sediment yield from a road network to streams in a forest watershed was estimated by using the methodology of a GIS-based sediment prediction model, the SEDMODL model. GIS techniques were used to provide required data layers such as topography, streams, roads, geology, and average precipitation. The results indicated that the SEDMODL model integrated with GIS techniques can assist road managers to estimate total sediment yield quickly and effectively. Besides, critical road sections with high sediment yield potential can be identified and the efficiencies of various sediment control measures can be evaluated for these sections.
Open Journal of geology, 2017
Better management of agricultural fields is related to valuable information which can derived fro... more Better management of agricultural fields is related to valuable information which can derived from soil salinity and alkalinity maps. These maps are considered as one of the most important factors which restrict plant growth as well as decline crops yield. The objective of this research was preparing of soil salinity and alkalinity maps in Tabriz plain over 50,000 hectares based on different techniques of spatial analysis in GIS software. For this mean, study area was divided in 1500 × 1500 m 2 grid cells. Then, geographical coordinate of each grid recorded in UTM system. So, they were transferred into GPS for navigating to the exact excavation location. After soil sampling and transferring to the lab, their EC and PH were measured in saturation extract of soil samples. So, spatial distribution of soil sampling points was prepared in form of point map by GIS software. Generalization of point information to surface was performed using different interpolation algorithms and based on standards of Soil and Water Research Institute. Accuracy of interpolated maps was evaluated due to the MAE and MBE values. The results showed that the lowest observed error is related to the Spline method and therefore, this method was used for spatial modeling of salinity and alkalinity maps in the intended area. The research findings demonstrated that from total of 50,000 hectares, only 3066 hectares were without salinity and alkalinity limitation (6.1%), 9066 hectares had low salinity and alkalinity (18.1%); 17,772 hectares had average limitation for salinity and alkalinity (35.6%) and the remaining 20,096 hectares had high and very high limitation for salinity and alkalinity.
Environment and Water Engineering, Jun 11, 2021
Building and Environment, 2008
In forest lands, the stream channels receive the highest amount of sediment during road construct... more In forest lands, the stream channels receive the highest amount of sediment during road construction activities due to removal of vegetation cover from road surface, cut-slope, fill-slope, and ditch areas. Sediment delivered from a road section to streams causes serious damages on water resources and aquatic life. Performing revegetation in cut-slope and fill-slope reduce sediment yield from a road section; however, road surface and ditch continue to deliver considerable amount of sediment to the streams. Therefore, accurate prediction of sediment yield from existing road network can be very critical. In order to estimate average sediment yield, several sediment prediction models have been developed based on empirical relationships between various road erosion factors. In this study, average annual sediment yield from a road network to streams in a forest watershed was estimated by using the methodology of a GIS-based sediment prediction model, the SEDMODL model. GIS techniques were used to provide required data layers such as topography, streams, roads, geology, and average precipitation. The results indicated that the SEDMODL model integrated with GIS techniques can assist road managers to estimate total sediment yield quickly and effectively. Besides, critical road sections with high sediment yield potential can be identified and the efficiencies of various sediment control measures can be evaluated for these sections.
Theoretical and Applied Climatology
Land evaluation based on its characteristics is a criterion for the proper use of land potential.... more Land evaluation based on its characteristics is a criterion for the proper use of land potential. The high benefit and low water requirement of pistachio has significantly increased its cultivation area in Iran. The objective of this study was to evaluate the suitability of lands for pistachio cultivation based on climatic variables in four provinces, which located in northwestern part of Iran. The climatic requirements of pistachio were specified based on its phenological information. Then, the suitability map of pistachio cultivation zones, spatially modeled in GIS environment based on long term of meteorological data. Subsequently, the results were verified due to field survey and interviews with farmers. The results showed study area classified into three categories from suitable (class S1), moderate suitable (S2), and non-suitable (class N) based on FAO land capability guidelines. So, accuracy of suitability map was validated by overlaying of spatial information of existing pistachio orchards. The results indicated that 33, 33.4, 60, and 12.4% of the East Azerbaijan, West Azerbaijan, Kurdistan, and Ardabil provinces are suitable for pistachio cultivation (class S1), respectively, while the area of unsuitable class (class N) in these provinces was 40, 34.7, 22.7, and 62%, respectively. It was found that the temperature and relative humidity during pollination and growth periods are the main limiting factors for construction of pistachio orchards. The obtained maps can be used as a guide to prevent the planting of pistachios in unsuitable areas and consequently save water consumption in drought conditions.
DESCRIPTION Differential synthetic aperture radar interferometry (D-InSAR) has become a useful te... more DESCRIPTION Differential synthetic aperture radar interferometry (D-InSAR) has become a useful technique for monitoring ground movement. The technique enables the analysis of very small ground movements in continuous, large areas and has the advantages of high accuracy, high resolution, all-weather adaptability, low cost and inaccessible area coverage. Thus, D-InSAR has been widely used in the investigation of geologic hazards, such as subsidence, landslide, earthquake, and volcanic activity. In this research, D-InSAR technique was applied to detection of unstable slopes and determining moving displacement rate. For this mean, eight SAR images of PALSAR sensor of ALOS satellite were selected for processing based on D-InSAR approach. Obtained results were validated by field observations prates. This paper is only represented results related to image pair processing of 5th July to 5th October 2007 with 92 days interval. Garm Chay basin with 940km2 area is located in North Eastern and ...
In this research water balance was calculated for Salmas and Tassoj in the north and western-nort... more In this research water balance was calculated for Salmas and Tassoj in the north and western-north part of Orumiyeh Lake in ten water years (1991-2001). Satellite images (Aster image), CROPWAT model, coupled with GIS were applied to compute water balance components. Satellite images (Aster on 2 nd July 2001) were used to determine type and area of cultivated crops. Nine main crops for Salmas and five main crops for Tassoj area were distinguished. Ground truth data was used as ancillary data. Lack of multi-temporal images was main problem in crop classification. CROPWAT model was applied to calculate actual evapotranspiration and net irrigation water requirement based on local climatic data and derived crop data on satellite image processing. This model calculated net irrigation water requirement for some dominant crops such as: cereal, alfalfa, apple, almond, eggplant, potato, and sunflower in the study area. Inflow and outflow amounts of surface water were determined using river discharge data in irrigated area, which, are equipped with hydrometers gauges. In ungauged area runoff was estimated by applying runoff coefficient method. Groundwater uses for agricultural practices was determined using current pumping data in the Tassoj region. Groundwater uses in the Salmas area where has no pumping data was calculated by applying net irrigation water requirement approach. GIS environment was used to determine groundwater table fluctuations. Water balance for irrigated lands in both areas was calculated by applying an On-farm water balance model. The calculated water balance shows a deciding trend in both areas, particularly in the Tassoj area. The integration of satellite images, GIS, and CROPWAT model to investigation of water balance in irrigated area VI Mean monthly rainfall (mm) for Salmas regions (1991-2001)
Landslides cause enormous economic damage and fatalities worldwide. Production of Landslides risk... more Landslides cause enormous economic damage and fatalities worldwide. Production of Landslides risk probability and susceptibility map is one of the major tasks to reduction of those further hazards. The aim of this research was to investigate of landslide susceptibility as well as slope instability assessment at the Tassoj basin. In this study, the process-based model SINMAP (Stability Index Mapping) was applied to prepared landslide susceptibility based upon geographic information systems (GIS) and primarily digital elevation data (DEM) which derived from 1:25000 Topography maps. Simulated results showed, the slope instability risk is relatively high in the study region. Model calibrations based on simulated results and field observations comparison inform of aerial photo interpretation indicated that simulated results of model can be accepted in good confidence level. Also, overlaying simulated results with corresponding slope and lithological maps showed that the greatest part of ...
Open Journal of Geology, 2017
Springer, 2021
Land evaluation based on its characteristics is a criterion for the proper use of land potential.... more Land evaluation based on its characteristics is a criterion for the proper use of land potential. The high benefit and low water requirement of pistachio has significantly increased its cultivation area in Iran. The objective of this study was to evaluate the suitability of lands for pistachio cultivation based on climatic variables in four provinces, which located in northwestern part of Iran. The climatic requirements of pistachio were specified based on its phenological information. Then, the suitability map of pistachio cultivation zones, spatially modeled in GIS environment based on long term of meteorological data. Subsequently, the results were verified due to field survey and interviews with farmers. The results showed study area classified into three categories from suitable (class S1), moderate suitable (S2), and non-suitable (class N) based on FAO land capability guidelines. So, accuracy of suitability map was validated by overlaying of spatial information of existing pistachio orchards. The results indicated that 33, 33.4, 60, and 12.4% of the East Azerbaijan, West Azerbaijan, Kurdistan, and Ardabil provinces are suitable for pistachio cultivation (class S1), respectively, while the area of unsuitable class (class N) in these provinces was 40, 34.7, 22.7, and 62%, respectively. It was found that the temperature and relative humidity during pollination and growth periods are the main limiting factors for construction of pistachio orchards. The obtained maps can be used as a guide to prevent the planting of pistachios in unsuitable areas and consequently save water consumption in drought conditions.
ECOPERSIA, Sep 10, 2021
In forest lands, the stream channels receive the highest amount of sediment during road construct... more In forest lands, the stream channels receive the highest amount of sediment during road construction activities due to removal of vegetation cover from road surface, cut-slope, fill-slope, and ditch areas. Sediment delivered from a road section to streams causes serious damages on water resources and aquatic life. Performing revegetation in cut-slope and fill-slope reduce sediment yield from a road section; however, road surface and ditch continue to deliver considerable amount of sediment to the streams. Therefore, accurate prediction of sediment yield from existing road network can be very critical. In order to estimate average sediment yield, several sediment prediction models have been developed based on empirical relationships between various road erosion factors. In this study, average annual sediment yield from a road network to streams in a forest watershed was estimated by using the methodology of a GIS-based sediment prediction model, the SEDMODL model. GIS techniques were used to provide required data layers such as topography, streams, roads, geology, and average precipitation. The results indicated that the SEDMODL model integrated with GIS techniques can assist road managers to estimate total sediment yield quickly and effectively. Besides, critical road sections with high sediment yield potential can be identified and the efficiencies of various sediment control measures can be evaluated for these sections.
Open Journal of geology, 2017
Better management of agricultural fields is related to valuable information which can derived fro... more Better management of agricultural fields is related to valuable information which can derived from soil salinity and alkalinity maps. These maps are considered as one of the most important factors which restrict plant growth as well as decline crops yield. The objective of this research was preparing of soil salinity and alkalinity maps in Tabriz plain over 50,000 hectares based on different techniques of spatial analysis in GIS software. For this mean, study area was divided in 1500 × 1500 m 2 grid cells. Then, geographical coordinate of each grid recorded in UTM system. So, they were transferred into GPS for navigating to the exact excavation location. After soil sampling and transferring to the lab, their EC and PH were measured in saturation extract of soil samples. So, spatial distribution of soil sampling points was prepared in form of point map by GIS software. Generalization of point information to surface was performed using different interpolation algorithms and based on standards of Soil and Water Research Institute. Accuracy of interpolated maps was evaluated due to the MAE and MBE values. The results showed that the lowest observed error is related to the Spline method and therefore, this method was used for spatial modeling of salinity and alkalinity maps in the intended area. The research findings demonstrated that from total of 50,000 hectares, only 3066 hectares were without salinity and alkalinity limitation (6.1%), 9066 hectares had low salinity and alkalinity (18.1%); 17,772 hectares had average limitation for salinity and alkalinity (35.6%) and the remaining 20,096 hectares had high and very high limitation for salinity and alkalinity.
Environment and Water Engineering, Jun 11, 2021
Building and Environment, 2008
In forest lands, the stream channels receive the highest amount of sediment during road construct... more In forest lands, the stream channels receive the highest amount of sediment during road construction activities due to removal of vegetation cover from road surface, cut-slope, fill-slope, and ditch areas. Sediment delivered from a road section to streams causes serious damages on water resources and aquatic life. Performing revegetation in cut-slope and fill-slope reduce sediment yield from a road section; however, road surface and ditch continue to deliver considerable amount of sediment to the streams. Therefore, accurate prediction of sediment yield from existing road network can be very critical. In order to estimate average sediment yield, several sediment prediction models have been developed based on empirical relationships between various road erosion factors. In this study, average annual sediment yield from a road network to streams in a forest watershed was estimated by using the methodology of a GIS-based sediment prediction model, the SEDMODL model. GIS techniques were used to provide required data layers such as topography, streams, roads, geology, and average precipitation. The results indicated that the SEDMODL model integrated with GIS techniques can assist road managers to estimate total sediment yield quickly and effectively. Besides, critical road sections with high sediment yield potential can be identified and the efficiencies of various sediment control measures can be evaluated for these sections.
Theoretical and Applied Climatology
Land evaluation based on its characteristics is a criterion for the proper use of land potential.... more Land evaluation based on its characteristics is a criterion for the proper use of land potential. The high benefit and low water requirement of pistachio has significantly increased its cultivation area in Iran. The objective of this study was to evaluate the suitability of lands for pistachio cultivation based on climatic variables in four provinces, which located in northwestern part of Iran. The climatic requirements of pistachio were specified based on its phenological information. Then, the suitability map of pistachio cultivation zones, spatially modeled in GIS environment based on long term of meteorological data. Subsequently, the results were verified due to field survey and interviews with farmers. The results showed study area classified into three categories from suitable (class S1), moderate suitable (S2), and non-suitable (class N) based on FAO land capability guidelines. So, accuracy of suitability map was validated by overlaying of spatial information of existing pistachio orchards. The results indicated that 33, 33.4, 60, and 12.4% of the East Azerbaijan, West Azerbaijan, Kurdistan, and Ardabil provinces are suitable for pistachio cultivation (class S1), respectively, while the area of unsuitable class (class N) in these provinces was 40, 34.7, 22.7, and 62%, respectively. It was found that the temperature and relative humidity during pollination and growth periods are the main limiting factors for construction of pistachio orchards. The obtained maps can be used as a guide to prevent the planting of pistachios in unsuitable areas and consequently save water consumption in drought conditions.
DESCRIPTION Differential synthetic aperture radar interferometry (D-InSAR) has become a useful te... more DESCRIPTION Differential synthetic aperture radar interferometry (D-InSAR) has become a useful technique for monitoring ground movement. The technique enables the analysis of very small ground movements in continuous, large areas and has the advantages of high accuracy, high resolution, all-weather adaptability, low cost and inaccessible area coverage. Thus, D-InSAR has been widely used in the investigation of geologic hazards, such as subsidence, landslide, earthquake, and volcanic activity. In this research, D-InSAR technique was applied to detection of unstable slopes and determining moving displacement rate. For this mean, eight SAR images of PALSAR sensor of ALOS satellite were selected for processing based on D-InSAR approach. Obtained results were validated by field observations prates. This paper is only represented results related to image pair processing of 5th July to 5th October 2007 with 92 days interval. Garm Chay basin with 940km2 area is located in North Eastern and ...
In this research water balance was calculated for Salmas and Tassoj in the north and western-nort... more In this research water balance was calculated for Salmas and Tassoj in the north and western-north part of Orumiyeh Lake in ten water years (1991-2001). Satellite images (Aster image), CROPWAT model, coupled with GIS were applied to compute water balance components. Satellite images (Aster on 2 nd July 2001) were used to determine type and area of cultivated crops. Nine main crops for Salmas and five main crops for Tassoj area were distinguished. Ground truth data was used as ancillary data. Lack of multi-temporal images was main problem in crop classification. CROPWAT model was applied to calculate actual evapotranspiration and net irrigation water requirement based on local climatic data and derived crop data on satellite image processing. This model calculated net irrigation water requirement for some dominant crops such as: cereal, alfalfa, apple, almond, eggplant, potato, and sunflower in the study area. Inflow and outflow amounts of surface water were determined using river discharge data in irrigated area, which, are equipped with hydrometers gauges. In ungauged area runoff was estimated by applying runoff coefficient method. Groundwater uses for agricultural practices was determined using current pumping data in the Tassoj region. Groundwater uses in the Salmas area where has no pumping data was calculated by applying net irrigation water requirement approach. GIS environment was used to determine groundwater table fluctuations. Water balance for irrigated lands in both areas was calculated by applying an On-farm water balance model. The calculated water balance shows a deciding trend in both areas, particularly in the Tassoj area. The integration of satellite images, GIS, and CROPWAT model to investigation of water balance in irrigated area VI Mean monthly rainfall (mm) for Salmas regions (1991-2001)
Landslides cause enormous economic damage and fatalities worldwide. Production of Landslides risk... more Landslides cause enormous economic damage and fatalities worldwide. Production of Landslides risk probability and susceptibility map is one of the major tasks to reduction of those further hazards. The aim of this research was to investigate of landslide susceptibility as well as slope instability assessment at the Tassoj basin. In this study, the process-based model SINMAP (Stability Index Mapping) was applied to prepared landslide susceptibility based upon geographic information systems (GIS) and primarily digital elevation data (DEM) which derived from 1:25000 Topography maps. Simulated results showed, the slope instability risk is relatively high in the study region. Model calibrations based on simulated results and field observations comparison inform of aerial photo interpretation indicated that simulated results of model can be accepted in good confidence level. Also, overlaying simulated results with corresponding slope and lithological maps showed that the greatest part of ...