The Experts below are selected from a list of 26805 Experts worldwide ranked by ideXlab platform
Yuangfang Huang - One of the best experts on this subject based on the ideXlab platform.
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spatial variability of shallow Groundwater level electrical conductivity and nitrate concentration and risk assessment of nitrate contamination in north china plain
Environment International, 2005Co-Authors: Yuangfang Huang, Deli Chen, Rob WhiteAbstract:In recent years, nitrate (NO3) contamination of Groundwater has become a growing concern for people in rural areas in North China Plain (NCP) where Groundwater is used as drinking water. The objective of this study was to evaluate Groundwater Resource level, to determine Groundwater quality and to assess the risk of NO3 pollution in Groundwater in Quzhou County in the NCP. Ordinary Kriging (OK) method was used to analyze the spatial variability of shallow Groundwater level, Groundwater electrical conductivity (EC) and NO3-N concentrations, and Indictor Kriging (IK) method was used to analyze the data with NO3-N concentrations equal or greater than the Groundwater NO3 pollution threshold (20 mg L(-1)). The results indicated that Groundwater level averaged 9.81 m, a level 6 m lower than in 1990. The spatial correlation distances for Groundwater level, EC and NO3-N concentration were 21.93, 2.19 and 3.55 km, respectively. The contour map showed that shallow Groundwater level areas extended from north to south across the County. Groundwater EC was above 3 dS m(-1) in the most part of the northern county. Groundwater NO3 pollution (NO3-N> or =20 mg L(-1)) mainly occurred in the County Seat areas due to wastewater irrigation and excessive fertilizer leaching from agricultural fields. At Henantuang town, besides suburban of the County Seat, Groundwater was also contaminated by NO3 shown by the map generated using the IK method, which was not reflected in the map generated using the OK method. The map generated using the OK method could not reflect correctly the Groundwater NO3 pollution status. The IK method is useful to assess the risk of NO3 pollution by giving the conditional probability of NO3 concentration exceeding the threshold value. It is suggested that risk assessment of NO3 pollution is useful for better managing Groundwater Resource, preventing soil salinization and minimizing NO3 pollution in Groundwater.
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spatial variability of shallow Groundwater level electrical conductivity and nitrate concentration and risk assessment of nitrate contamination in north china plain
Environment International, 2005Co-Authors: Yuangfang Huang, Deli Chen, Robert Edlin WhiteAbstract:In recent years, nitrate (NO3) contamination of Groundwater has become a growing concern for people in rural areas in North China Plain (NCP) where Groundwater is used as drinking water. The objective of this study was to evaluate Groundwater Resource level, to determine Groundwater quality and to assess the risk of NO3 pollution in Groundwater in Quzhou County in the NCP. Ordinary Kriging (OK) method was used to analyze the spatial variability of shallow Groundwater level, Groundwater electrical conductivity (EC) and NO3–N concentrations, and Indictor Kriging (IK) method was used to analyze the data with NO3–N concentrations equal or greater than the Groundwater NO3 pollution threshold (20 mg L � 1 ). The results indicated that Groundwater level averaged 9.81 m, a level 6 m lower than in 1990. The spatial correlation distances for Groundwater level, EC and NO3–N concentration were 21.93, 2.19 and 3.55 km, respectively. The contour map showed that shallow Groundwater level areas extended from north to south across the County. Groundwater EC was above 3 dS m � 1 in the most part of the northern county. Groundwater NO3 pollution (NO3–N� 20 mg L � 1 ) mainly occurred in the County Seat areas due to wastewater irrigation and excessive fertilizer leaching from agricultural fields. At Henantuang town, besides suburban of the County Seat, Groundwater was also contaminated by NO3 shown by the map generated using the IK method, which was not reflected in the map generated using the OK method. The map generated using the OK method could not reflect correctly the Groundwater NO3 pollution status. The IK method is useful to assess the risk of NO3 pollution by giving the conditional probability of NO3 concentration exceeding the threshold value. It is suggested that risk assessment of NO3 pollution is useful for better managing Groundwater Resource, preventing soil salinization and minimizing NO3 pollution in Groundwater. D 2005 Elsevier Ltd. All rights reserved.
Chunmiao Zheng - One of the best experts on this subject based on the ideXlab platform.
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effect of Groundwater quality on sustainability of Groundwater Resource a case study in the north china plain
Journal of Contaminant Hydrology, 2015Co-Authors: Jie Liu, Chunmiao ZhengAbstract:The North China Plain (NCP) is one of the most severe water shortage areas in China. Due to the scarcity of surface water in the NCP, Groundwater system is seriously over-exploited and use of nitrogen fertilizers is greatly increasing year by year to improve soil fertility and crop production, causing a variety of environmental issues in the processes of abstracting Groundwater. Considering that previous research was limited on approaches to assess sustainability of Groundwater through flow modeling and water level decline, this study focuses on addressing the implications of Groundwater contaminant for water Resource sustainability in the central part of NCP. Based on the previously developed Groundwater flow model, a reaction modular code for the reactive transport in three-dimensional aquifers (RT3D) is developed for simulating the reactive process of nitrogen species transport in Groundwater system. The management optimization model coupled with the nitrogen reactive transport model under consideration of water quality constraints is then conducted to quantify and improve the sustainability of Groundwater utilization in the study area. Thus, the optimal pumping well locations and pumping rates that lead to the maximum total yield or the minimum total management costs subjecting to a series of Groundwater level constraints are obtained from the optimization models. Compared with the optimization model without water quality constraints, this study could provide a more useful tool for developing cost-effective strategies for sustainable management of Groundwater Resource in the NCP, and greatly improve Groundwater management level and water quality.
Rob White - One of the best experts on this subject based on the ideXlab platform.
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spatial variability of shallow Groundwater level electrical conductivity and nitrate concentration and risk assessment of nitrate contamination in north china plain
Environment International, 2005Co-Authors: Yuangfang Huang, Deli Chen, Rob WhiteAbstract:In recent years, nitrate (NO3) contamination of Groundwater has become a growing concern for people in rural areas in North China Plain (NCP) where Groundwater is used as drinking water. The objective of this study was to evaluate Groundwater Resource level, to determine Groundwater quality and to assess the risk of NO3 pollution in Groundwater in Quzhou County in the NCP. Ordinary Kriging (OK) method was used to analyze the spatial variability of shallow Groundwater level, Groundwater electrical conductivity (EC) and NO3-N concentrations, and Indictor Kriging (IK) method was used to analyze the data with NO3-N concentrations equal or greater than the Groundwater NO3 pollution threshold (20 mg L(-1)). The results indicated that Groundwater level averaged 9.81 m, a level 6 m lower than in 1990. The spatial correlation distances for Groundwater level, EC and NO3-N concentration were 21.93, 2.19 and 3.55 km, respectively. The contour map showed that shallow Groundwater level areas extended from north to south across the County. Groundwater EC was above 3 dS m(-1) in the most part of the northern county. Groundwater NO3 pollution (NO3-N> or =20 mg L(-1)) mainly occurred in the County Seat areas due to wastewater irrigation and excessive fertilizer leaching from agricultural fields. At Henantuang town, besides suburban of the County Seat, Groundwater was also contaminated by NO3 shown by the map generated using the IK method, which was not reflected in the map generated using the OK method. The map generated using the OK method could not reflect correctly the Groundwater NO3 pollution status. The IK method is useful to assess the risk of NO3 pollution by giving the conditional probability of NO3 concentration exceeding the threshold value. It is suggested that risk assessment of NO3 pollution is useful for better managing Groundwater Resource, preventing soil salinization and minimizing NO3 pollution in Groundwater.
Robert Edlin White - One of the best experts on this subject based on the ideXlab platform.
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spatial variability of shallow Groundwater level electrical conductivity and nitrate concentration and risk assessment of nitrate contamination in north china plain
Environment International, 2005Co-Authors: Yuangfang Huang, Deli Chen, Robert Edlin WhiteAbstract:In recent years, nitrate (NO3) contamination of Groundwater has become a growing concern for people in rural areas in North China Plain (NCP) where Groundwater is used as drinking water. The objective of this study was to evaluate Groundwater Resource level, to determine Groundwater quality and to assess the risk of NO3 pollution in Groundwater in Quzhou County in the NCP. Ordinary Kriging (OK) method was used to analyze the spatial variability of shallow Groundwater level, Groundwater electrical conductivity (EC) and NO3–N concentrations, and Indictor Kriging (IK) method was used to analyze the data with NO3–N concentrations equal or greater than the Groundwater NO3 pollution threshold (20 mg L � 1 ). The results indicated that Groundwater level averaged 9.81 m, a level 6 m lower than in 1990. The spatial correlation distances for Groundwater level, EC and NO3–N concentration were 21.93, 2.19 and 3.55 km, respectively. The contour map showed that shallow Groundwater level areas extended from north to south across the County. Groundwater EC was above 3 dS m � 1 in the most part of the northern county. Groundwater NO3 pollution (NO3–N� 20 mg L � 1 ) mainly occurred in the County Seat areas due to wastewater irrigation and excessive fertilizer leaching from agricultural fields. At Henantuang town, besides suburban of the County Seat, Groundwater was also contaminated by NO3 shown by the map generated using the IK method, which was not reflected in the map generated using the OK method. The map generated using the OK method could not reflect correctly the Groundwater NO3 pollution status. The IK method is useful to assess the risk of NO3 pollution by giving the conditional probability of NO3 concentration exceeding the threshold value. It is suggested that risk assessment of NO3 pollution is useful for better managing Groundwater Resource, preventing soil salinization and minimizing NO3 pollution in Groundwater. D 2005 Elsevier Ltd. All rights reserved.
Deli Chen - One of the best experts on this subject based on the ideXlab platform.
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spatial variability of shallow Groundwater level electrical conductivity and nitrate concentration and risk assessment of nitrate contamination in north china plain
Environment International, 2005Co-Authors: Yuangfang Huang, Deli Chen, Rob WhiteAbstract:In recent years, nitrate (NO3) contamination of Groundwater has become a growing concern for people in rural areas in North China Plain (NCP) where Groundwater is used as drinking water. The objective of this study was to evaluate Groundwater Resource level, to determine Groundwater quality and to assess the risk of NO3 pollution in Groundwater in Quzhou County in the NCP. Ordinary Kriging (OK) method was used to analyze the spatial variability of shallow Groundwater level, Groundwater electrical conductivity (EC) and NO3-N concentrations, and Indictor Kriging (IK) method was used to analyze the data with NO3-N concentrations equal or greater than the Groundwater NO3 pollution threshold (20 mg L(-1)). The results indicated that Groundwater level averaged 9.81 m, a level 6 m lower than in 1990. The spatial correlation distances for Groundwater level, EC and NO3-N concentration were 21.93, 2.19 and 3.55 km, respectively. The contour map showed that shallow Groundwater level areas extended from north to south across the County. Groundwater EC was above 3 dS m(-1) in the most part of the northern county. Groundwater NO3 pollution (NO3-N> or =20 mg L(-1)) mainly occurred in the County Seat areas due to wastewater irrigation and excessive fertilizer leaching from agricultural fields. At Henantuang town, besides suburban of the County Seat, Groundwater was also contaminated by NO3 shown by the map generated using the IK method, which was not reflected in the map generated using the OK method. The map generated using the OK method could not reflect correctly the Groundwater NO3 pollution status. The IK method is useful to assess the risk of NO3 pollution by giving the conditional probability of NO3 concentration exceeding the threshold value. It is suggested that risk assessment of NO3 pollution is useful for better managing Groundwater Resource, preventing soil salinization and minimizing NO3 pollution in Groundwater.
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spatial variability of shallow Groundwater level electrical conductivity and nitrate concentration and risk assessment of nitrate contamination in north china plain
Environment International, 2005Co-Authors: Yuangfang Huang, Deli Chen, Robert Edlin WhiteAbstract:In recent years, nitrate (NO3) contamination of Groundwater has become a growing concern for people in rural areas in North China Plain (NCP) where Groundwater is used as drinking water. The objective of this study was to evaluate Groundwater Resource level, to determine Groundwater quality and to assess the risk of NO3 pollution in Groundwater in Quzhou County in the NCP. Ordinary Kriging (OK) method was used to analyze the spatial variability of shallow Groundwater level, Groundwater electrical conductivity (EC) and NO3–N concentrations, and Indictor Kriging (IK) method was used to analyze the data with NO3–N concentrations equal or greater than the Groundwater NO3 pollution threshold (20 mg L � 1 ). The results indicated that Groundwater level averaged 9.81 m, a level 6 m lower than in 1990. The spatial correlation distances for Groundwater level, EC and NO3–N concentration were 21.93, 2.19 and 3.55 km, respectively. The contour map showed that shallow Groundwater level areas extended from north to south across the County. Groundwater EC was above 3 dS m � 1 in the most part of the northern county. Groundwater NO3 pollution (NO3–N� 20 mg L � 1 ) mainly occurred in the County Seat areas due to wastewater irrigation and excessive fertilizer leaching from agricultural fields. At Henantuang town, besides suburban of the County Seat, Groundwater was also contaminated by NO3 shown by the map generated using the IK method, which was not reflected in the map generated using the OK method. The map generated using the OK method could not reflect correctly the Groundwater NO3 pollution status. The IK method is useful to assess the risk of NO3 pollution by giving the conditional probability of NO3 concentration exceeding the threshold value. It is suggested that risk assessment of NO3 pollution is useful for better managing Groundwater Resource, preventing soil salinization and minimizing NO3 pollution in Groundwater. D 2005 Elsevier Ltd. All rights reserved.
