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著者：N. Vongthanasunthorn and S. Sirivithayapakorn題名：Characteristics of Nutrients in the Estuary of the Chao Phraya River発表情報：International Symposium on Urban Water Management in Southeast Asia ページ: 114-121キーワード：Chao Phraya, Estuary, Nutrients, Loading, Finite Volume Model概要：Eutrophication problem in the estuary of the Chao Phraya River is not only a concerned issue for the authorities responsible for water environment in Thailand, but it is also an important problem for Bangkhen Water Treatment Plant of the Metropolitan Waterworks Authority (MWA), which uses the water of the Chao Phraya River as a raw water. The objective of this research is to provide information about nutrients which is necessary for eutrophication control in the estuary of the Chao Phraya River. Trend of nutrients in this estuary were analyzed based on secondary monitoring data and impact of loading from upstream was evaluated by using one dimensional finite volume model. It was found that nitrate nitrogen highly increased in 2012-2015 from the Chao Phraya Dam until the river mouth. The increase in total phosphorus at downstream confirmed the accumulation of phosphorus and effect of salinity on adsorption-desorption of phosphorus from suspended solids. Results of the water quality model indicated that loading from upstream strongly influenced on nutrients in the vicinity of the raw water pumping station of the MWA. However, loading from upstream was not the main cause of high nitrate nitrogen in 2012-2015. Control of nutrient loading from the upstream will be the most feasible way to deal with eutrophication problem near the raw water pumping station of the MWA.抄録：Eutrophication problem in the estuary of the Chao Phraya River is not only a concerned issue for the authorities responsible for water environment in Thailand, but it is also an important problem for Bangkhen Water Treatment Plant of the Metropolitan Waterworks Authority (MWA), which uses the water of the Chao Phraya River as a raw water. The objective of this research is to provide information about nutrients which is necessary for eutrophication control in the estuary of the Chao Phraya River. Trend of nutrients in this estuary were analyzed based on secondary monitoring data and impact of loading from upstream was evaluated by using one dimensional finite volume model. It was found that nitrate nitrogen highly increased in 2012-2015 from the Chao Phraya Dam until the river mouth. The increase in total phosphorus at downstream confirmed the accumulation of phosphorus and effect of salinity on adsorption-desorption of phosphorus from suspended solids. Results of the water quality model indicated that loading from upstream strongly influenced on nutrients in the vicinity of the raw water pumping station of the MWA. However, loading from upstream was not the main cause of high nitrate nitrogen in 2012-2015. Control of nutrient loading from the upstream will be the most feasible way to deal with eutrophication problem near the raw water pumping station of the MWA.英語フィールド
Author：N. Vongthanasunthorn and S. SirivithayapakornTitle：Characteristics of Nutrients in the Estuary of the Chao Phraya RiverAnnouncement information:International Symposium on Urban Water Management in Southeast Asia Page: 114-121Keyword：Chao Phraya, Estuary, Nutrients, Loading, Finite Volume ModelAn abstract：Eutrophication problem in the estuary of the Chao Phraya River is not only a concerned issue for the authorities responsible for water environment in Thailand, but it is also an important problem for Bangkhen Water Treatment Plant of the Metropolitan Waterworks Authority (MWA), which uses the water of the Chao Phraya River as a raw water. The objective of this research is to provide information about nutrients which is necessary for eutrophication control in the estuary of the Chao Phraya River. Trend of nutrients in this estuary were analyzed based on secondary monitoring data and impact of loading from upstream was evaluated by using one dimensional finite volume model. It was found that nitrate nitrogen highly increased in 2012-2015 from the Chao Phraya Dam until the river mouth. The increase in total phosphorus at downstream confirmed the accumulation of phosphorus and effect of salinity on adsorption-desorption of phosphorus from suspended solids. Results of the water quality model indicated that loading from upstream strongly influenced on nutrients in the vicinity of the raw water pumping station of the MWA. However, loading from upstream was not the main cause of high nitrate nitrogen in 2012-2015. Control of nutrient loading from the upstream will be the most feasible way to deal with eutrophication problem near the raw water pumping station of the MWA.An abstract：Eutrophication problem in the estuary of the Chao Phraya River is not only a concerned issue for the authorities responsible for water environment in Thailand, but it is also an important problem for Bangkhen Water Treatment Plant of the Metropolitan Waterworks Authority (MWA), which uses the water of the Chao Phraya River as a raw water. The objective of this research is to provide information about nutrients which is necessary for eutrophication control in the estuary of the Chao Phraya River. Trend of nutrients in this estuary were analyzed based on secondary monitoring data and impact of loading from upstream was evaluated by using one dimensional finite volume model. It was found that nitrate nitrogen highly increased in 2012-2015 from the Chao Phraya Dam until the river mouth. The increase in total phosphorus at downstream confirmed the accumulation of phosphorus and effect of salinity on adsorption-desorption of phosphorus from suspended solids. Results of the water quality model indicated that loading from upstream strongly influenced on nutrients in the vicinity of the raw water pumping station of the MWA. However, loading from upstream was not the main cause of high nitrate nitrogen in 2012-2015. Control of nutrient loading from the upstream will be the most feasible way to deal with eutrophication problem near the raw water pumping station of the MWA.