Adel Shirmohammadi - Academia.edu (original) (raw)
Papers by Adel Shirmohammadi
AGUFM, Dec 1, 2013
Best Management Practices (BMPs) have become the most effective way to mitigate non-point source ... more Best Management Practices (BMPs) have become the most effective way to mitigate non-point source pollution (NPS) issues. Much attention has been paid to NPS in rural areas, where agricultural activities increase nutrients, toxics, and sediments in surface water. Stormwater from urban areas is also a major contributor to NPS pollution.
2000 ASAE Annual International Meeting, Milwaukee, Wisconsin, USA, 9-12 July 2000., 2000
... 141 First-Order Modeling of Conductivity Decay During Lateral Redistribution in a Stochastic ... more ... 141 First-Order Modeling of Conductivity Decay During Lateral Redistribution in a Stochastic Soil Hubert J. Montas and Adel Shirmohammadi1 Abstract ... Water Resour. Res., 19(1):161-180. Haghighi, K., CG Aguirre, A. Shirmohammadi, H. Montas and A. Madani, 2001. ...
Impact of irrigation trend, water table fluctuations, crop management, and tillage systems on gro... more Impact of irrigation trend, water table fluctuations, crop management, and tillage systems on groundwater quantity and quality of the southeast (Alabama, Florida, Georgia, and South Carolina) and Delta states (Arkansas, Louisiana, and Mississippi) are discussed. Areas with specific groundwater quality problems such as salt water intrusion and nitrate and pesticide levels are identified. Degradation of surface water quality is discussed relative to irrigation. The discussions provide the basis for developing irrigation and management systems to minimize groundwater withdrawal and surface and groundwater contamination by agricultural chemicals.
This paper presents the movement of both encapsulated and wettable powder atrazine under no-till ... more This paper presents the movement of both encapsulated and wettable powder atrazine under no-till and conventional-till corn in the Coastal Plain physiographic region of Maryland. Soil cores and suction lysimeters were used to evaluate the movement, mobility, and persistance of each formulation under different tillage systems. Results obtained from soil cores indicated that less than 1% of both wettable powder and starch encapsulated atrazine was present below 40 cm depth two weeks after application. Starch encapsulated atrazine was found to be less mobile under both tillage systems. Soil cores showed that no-till system had less herbicide than the conventional till system regardless of the atrazine formulation. Results of solution samples revealed similar conclusions regarding low mobility of starch encapsulated atrazine.
CRC Press eBooks, Dec 15, 2000
Agricultural nonpoint source pollution : , Agricultural nonpoint source pollution : , مرکز فناوری... more Agricultural nonpoint source pollution : , Agricultural nonpoint source pollution : , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
Water
Nonpoint source (NPS) pollution is a severe problem in the U.S. and worldwide. Best management pr... more Nonpoint source (NPS) pollution is a severe problem in the U.S. and worldwide. Best management practices (BMPs) have been widely used to control stormwater and reduce NPS pollution. Previous research has shown that socio-economic factors affect households’ adoption of BMPs, but few studies have quantitatively analyzed the spatio-temporal dynamics of household BMP adoption under different socio-economic conditions. In this paper, diverse regression approaches (linear, LASSO, support vector, random forest) were used on the ten-year data of household BMP adoption in socio-economically diverse areas of Washington, D.C., to model BMP adoption behaviors. The model with the best performance (random forest regression, R2 = 0.67, PBIAS = 7.2) was used to simulate spatio-temporal patterns of household BMP adoption in two nearby watersheds (Watts Branch watershed between Washington, D.C., and Maryland; Watershed 263 in Baltimore), each of which are characterized by different socio-economic (po...
Journal of Agriculture and Food Research
Science of The Total Environment, 2021
In watersheds located in semi-arid regions, vegetation dynamics, evapotranspiration (ET), and ass... more In watersheds located in semi-arid regions, vegetation dynamics, evapotranspiration (ET), and associated water and energy balances collectively play a major role in controlling hydrological regimes and crop yield. As such, it is challenging to predict the complex hydrological processes and biophysical dynamics. This challenge increases in areas with limited data availability. The key objective of this study was to evaluate the direct integration of remotely sensed Leaf Area Index (LAI) data into a hydrological model to improve streamflow, ET, and crop yield estimates. We also demonstrated how an improved model integrated with remotely sensed LAI data can inform water managers by predicting water productivity (WP) under different irrigation schemes. We took agricultural-dominated San Joaquin Watershed in California, United States, as our testbed and integrated the Moderate Resolution Imaging Spectroradiometer (MODIS) 500-m resolution 4-day total LAI data into the SWAT (Soil and Water Assessment Tool) model. Results showed that, compared to conventional SWAT model that relies on semi-empirical equations and user inputs for simulating biophysical processes, direct LAI integration into SWAT model (SWAT-LAI) notably captured the actual vegetation dynamics and improved ET and crop yield estimations. The WP simulated by the improved SWAT-LAI model for almond and grape yields varied within a range from 0.363 to 3.81 kg/m3 and 0.32 to 4.76 kg/m3 across different irrigation applications. The outcomes of this study showed that deficit irrigation application could be a viable option in water stressed regions, since it can save a substantial amount of irrigation water and maintain the higher water productivity required for both almond and grape yield production. This study shows an evidence of how remotely sensed data integrated into hydrological models can serve as a decision support tool by providing quantitative information on crop water use and crop production.
Sustainable Cities and Society, 2021
Agricultural Water Management, 2020
Water scarcity, climate variability and continuing growth in water demand have put severe pressur... more Water scarcity, climate variability and continuing growth in water demand have put severe pressure on high-quality freshwater sources. This challenge exacts the necessity to explore alternative water sources for agricultural irrigation. The objective of this study was to implement the integrated geospatial Multi-Criteria Decision Analysis (MCDA) with the Analytical Hierarchy Process (AHP) to evaluate the potentiality of reclaimed water use for agricultural irrigation in California. Five evaluation criteria included in this study were agricultural land (crop type), climate conditions, water policies, irrigation status, and proximity to wastewater treatment plants (WWTPs) respectively. The suitability maps for reclaimed water use were generated for three cases in terms of accessibility to WWTPs, their discharge volume and appropriate treatment processes respectively. In addition, a composite suitability map was produced using the hybrid model considering all three cases together. Results from this study led to a better understanding of sustainable reclaimed water use for crop irrigation at a regional level. It provided supporting evidence of the applicability of the GIS-MCDA method integrated with AHP technique for a larger geographical scale with a diverse crop pattern. This study established the importance of using both knowledge-based and data-driven criteria and sub-criteria in the decision framework. The results also highlighted how the spatial distribution of suitable areas for reclaimed water reuse is closely linked to the agricultural areas.
Journal of Environmental Quality, 2019
Hennig Brandt's discovery of phosphorus (P) occurred during the early European colonization o... more Hennig Brandt's discovery of phosphorus (P) occurred during the early European colonization of the Chesapeake Bay region. Today, P, an essential nutrient on land and water alike, is one of the principal threats to the health of the bay. Despite widespread implementation of best management practices across the Chesapeake Bay watershed following the implementation in 2010 of a total maximum daily load (TMDL) to improve the health of the bay, P load reductions across the bay's 166,000‐km2 watershed have been uneven, and dissolved P loads have increased in a number of the bay's tributaries. As the midpoint of the 15‐yr TMDL process has now passed, some of the more stubborn sources of P must now be tackled. For nonpoint agricultural sources, strategies that not only address particulate P but also mitigate dissolved P losses are essential. Lingering concerns include legacy P stored in soils and reservoir sediments, mitigation of P in artificial drainage and stormwater from hot...
Transactions of the ASABE, 2015
As a continuation of efforts to provide a common background and platform for development of calib... more As a continuation of efforts to provide a common background and platform for development of calibration and validation (C/V) guidelines for hydrologic and water quality (H/WQ) modeling, ASABE members worked to determine critical topics related to model C/V, perform a synthesis of a previously published special collection of articles and other relevant literature, and provide topic-specific recommendations based on the synthesis as well as personal modeling expertise. This article introduces a special collection of nine research articles covering key topics related to calibration and validation of H/WQ models. The topics include: terminology, hydrologic processes and model representation, spatial and temporal scales, model parameterization, C/V strategies, sensitivity, uncertainty, performance measures and criteria, and documentation and reporting. The main objective of this introductory article is to introduce and summarize key aspects of these topics, including recommendations. Individually, the articles provide model practitioners with detailed topic-specific recommendations related to model calibration, validation, and use. Collectively, the articles present recommendations to enhance H/WQ modeling.
Water Resources Management, 2017
Best Management Practices (BMPs) have become the most effective way to mitigate non-point source ... more Best Management Practices (BMPs) have become the most effective way to mitigate non-point source pollution (NPS) issues. Much attention has been paid to NPS in rural areas, where agricultural activities increase nutrients, toxics, and sediments in surface water. Stormwater from urban areas is also a major contributor to NPS pollution.
Preferential Flow: Water Movement and Chemical Transport in the Environment
Infiltration and soil hydraulic properties were measured for a loam soil at the soil surface and ... more Infiltration and soil hydraulic properties were measured for a loam soil at the soil surface and at a 30 cm depth beneath eastern gamagrass and tall fescue field plots. The experiment was repeated during February, May, August, and November of 1998. In-situ measurement of ...
Watershed Management and Hydrology, 2000
AGUFM, Dec 1, 2013
Best Management Practices (BMPs) have become the most effective way to mitigate non-point source ... more Best Management Practices (BMPs) have become the most effective way to mitigate non-point source pollution (NPS) issues. Much attention has been paid to NPS in rural areas, where agricultural activities increase nutrients, toxics, and sediments in surface water. Stormwater from urban areas is also a major contributor to NPS pollution.
2000 ASAE Annual International Meeting, Milwaukee, Wisconsin, USA, 9-12 July 2000., 2000
... 141 First-Order Modeling of Conductivity Decay During Lateral Redistribution in a Stochastic ... more ... 141 First-Order Modeling of Conductivity Decay During Lateral Redistribution in a Stochastic Soil Hubert J. Montas and Adel Shirmohammadi1 Abstract ... Water Resour. Res., 19(1):161-180. Haghighi, K., CG Aguirre, A. Shirmohammadi, H. Montas and A. Madani, 2001. ...
Impact of irrigation trend, water table fluctuations, crop management, and tillage systems on gro... more Impact of irrigation trend, water table fluctuations, crop management, and tillage systems on groundwater quantity and quality of the southeast (Alabama, Florida, Georgia, and South Carolina) and Delta states (Arkansas, Louisiana, and Mississippi) are discussed. Areas with specific groundwater quality problems such as salt water intrusion and nitrate and pesticide levels are identified. Degradation of surface water quality is discussed relative to irrigation. The discussions provide the basis for developing irrigation and management systems to minimize groundwater withdrawal and surface and groundwater contamination by agricultural chemicals.
This paper presents the movement of both encapsulated and wettable powder atrazine under no-till ... more This paper presents the movement of both encapsulated and wettable powder atrazine under no-till and conventional-till corn in the Coastal Plain physiographic region of Maryland. Soil cores and suction lysimeters were used to evaluate the movement, mobility, and persistance of each formulation under different tillage systems. Results obtained from soil cores indicated that less than 1% of both wettable powder and starch encapsulated atrazine was present below 40 cm depth two weeks after application. Starch encapsulated atrazine was found to be less mobile under both tillage systems. Soil cores showed that no-till system had less herbicide than the conventional till system regardless of the atrazine formulation. Results of solution samples revealed similar conclusions regarding low mobility of starch encapsulated atrazine.
CRC Press eBooks, Dec 15, 2000
Agricultural nonpoint source pollution : , Agricultural nonpoint source pollution : , مرکز فناوری... more Agricultural nonpoint source pollution : , Agricultural nonpoint source pollution : , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
Water
Nonpoint source (NPS) pollution is a severe problem in the U.S. and worldwide. Best management pr... more Nonpoint source (NPS) pollution is a severe problem in the U.S. and worldwide. Best management practices (BMPs) have been widely used to control stormwater and reduce NPS pollution. Previous research has shown that socio-economic factors affect households’ adoption of BMPs, but few studies have quantitatively analyzed the spatio-temporal dynamics of household BMP adoption under different socio-economic conditions. In this paper, diverse regression approaches (linear, LASSO, support vector, random forest) were used on the ten-year data of household BMP adoption in socio-economically diverse areas of Washington, D.C., to model BMP adoption behaviors. The model with the best performance (random forest regression, R2 = 0.67, PBIAS = 7.2) was used to simulate spatio-temporal patterns of household BMP adoption in two nearby watersheds (Watts Branch watershed between Washington, D.C., and Maryland; Watershed 263 in Baltimore), each of which are characterized by different socio-economic (po...
Journal of Agriculture and Food Research
Science of The Total Environment, 2021
In watersheds located in semi-arid regions, vegetation dynamics, evapotranspiration (ET), and ass... more In watersheds located in semi-arid regions, vegetation dynamics, evapotranspiration (ET), and associated water and energy balances collectively play a major role in controlling hydrological regimes and crop yield. As such, it is challenging to predict the complex hydrological processes and biophysical dynamics. This challenge increases in areas with limited data availability. The key objective of this study was to evaluate the direct integration of remotely sensed Leaf Area Index (LAI) data into a hydrological model to improve streamflow, ET, and crop yield estimates. We also demonstrated how an improved model integrated with remotely sensed LAI data can inform water managers by predicting water productivity (WP) under different irrigation schemes. We took agricultural-dominated San Joaquin Watershed in California, United States, as our testbed and integrated the Moderate Resolution Imaging Spectroradiometer (MODIS) 500-m resolution 4-day total LAI data into the SWAT (Soil and Water Assessment Tool) model. Results showed that, compared to conventional SWAT model that relies on semi-empirical equations and user inputs for simulating biophysical processes, direct LAI integration into SWAT model (SWAT-LAI) notably captured the actual vegetation dynamics and improved ET and crop yield estimations. The WP simulated by the improved SWAT-LAI model for almond and grape yields varied within a range from 0.363 to 3.81 kg/m3 and 0.32 to 4.76 kg/m3 across different irrigation applications. The outcomes of this study showed that deficit irrigation application could be a viable option in water stressed regions, since it can save a substantial amount of irrigation water and maintain the higher water productivity required for both almond and grape yield production. This study shows an evidence of how remotely sensed data integrated into hydrological models can serve as a decision support tool by providing quantitative information on crop water use and crop production.
Sustainable Cities and Society, 2021
Agricultural Water Management, 2020
Water scarcity, climate variability and continuing growth in water demand have put severe pressur... more Water scarcity, climate variability and continuing growth in water demand have put severe pressure on high-quality freshwater sources. This challenge exacts the necessity to explore alternative water sources for agricultural irrigation. The objective of this study was to implement the integrated geospatial Multi-Criteria Decision Analysis (MCDA) with the Analytical Hierarchy Process (AHP) to evaluate the potentiality of reclaimed water use for agricultural irrigation in California. Five evaluation criteria included in this study were agricultural land (crop type), climate conditions, water policies, irrigation status, and proximity to wastewater treatment plants (WWTPs) respectively. The suitability maps for reclaimed water use were generated for three cases in terms of accessibility to WWTPs, their discharge volume and appropriate treatment processes respectively. In addition, a composite suitability map was produced using the hybrid model considering all three cases together. Results from this study led to a better understanding of sustainable reclaimed water use for crop irrigation at a regional level. It provided supporting evidence of the applicability of the GIS-MCDA method integrated with AHP technique for a larger geographical scale with a diverse crop pattern. This study established the importance of using both knowledge-based and data-driven criteria and sub-criteria in the decision framework. The results also highlighted how the spatial distribution of suitable areas for reclaimed water reuse is closely linked to the agricultural areas.
Journal of Environmental Quality, 2019
Hennig Brandt's discovery of phosphorus (P) occurred during the early European colonization o... more Hennig Brandt's discovery of phosphorus (P) occurred during the early European colonization of the Chesapeake Bay region. Today, P, an essential nutrient on land and water alike, is one of the principal threats to the health of the bay. Despite widespread implementation of best management practices across the Chesapeake Bay watershed following the implementation in 2010 of a total maximum daily load (TMDL) to improve the health of the bay, P load reductions across the bay's 166,000‐km2 watershed have been uneven, and dissolved P loads have increased in a number of the bay's tributaries. As the midpoint of the 15‐yr TMDL process has now passed, some of the more stubborn sources of P must now be tackled. For nonpoint agricultural sources, strategies that not only address particulate P but also mitigate dissolved P losses are essential. Lingering concerns include legacy P stored in soils and reservoir sediments, mitigation of P in artificial drainage and stormwater from hot...
Transactions of the ASABE, 2015
As a continuation of efforts to provide a common background and platform for development of calib... more As a continuation of efforts to provide a common background and platform for development of calibration and validation (C/V) guidelines for hydrologic and water quality (H/WQ) modeling, ASABE members worked to determine critical topics related to model C/V, perform a synthesis of a previously published special collection of articles and other relevant literature, and provide topic-specific recommendations based on the synthesis as well as personal modeling expertise. This article introduces a special collection of nine research articles covering key topics related to calibration and validation of H/WQ models. The topics include: terminology, hydrologic processes and model representation, spatial and temporal scales, model parameterization, C/V strategies, sensitivity, uncertainty, performance measures and criteria, and documentation and reporting. The main objective of this introductory article is to introduce and summarize key aspects of these topics, including recommendations. Individually, the articles provide model practitioners with detailed topic-specific recommendations related to model calibration, validation, and use. Collectively, the articles present recommendations to enhance H/WQ modeling.
Water Resources Management, 2017
Best Management Practices (BMPs) have become the most effective way to mitigate non-point source ... more Best Management Practices (BMPs) have become the most effective way to mitigate non-point source pollution (NPS) issues. Much attention has been paid to NPS in rural areas, where agricultural activities increase nutrients, toxics, and sediments in surface water. Stormwater from urban areas is also a major contributor to NPS pollution.
Preferential Flow: Water Movement and Chemical Transport in the Environment
Infiltration and soil hydraulic properties were measured for a loam soil at the soil surface and ... more Infiltration and soil hydraulic properties were measured for a loam soil at the soil surface and at a 30 cm depth beneath eastern gamagrass and tall fescue field plots. The experiment was repeated during February, May, August, and November of 1998. In-situ measurement of ...
Watershed Management and Hydrology, 2000