日本語フィールド
著者：N. Vongthanasunthorn, H. Sasaki, K. Koga, M. Sakata, and K. Tabira題名：Impact of Inflow Loading and Algal Productivity on Water Quality in the Chikugo Barrage Reservoir, Japan発表情報：Thai Environmental Engineering Journal 巻: 33 号: 2 ページ: 1-11キーワード：Chikugo Barrage, Homan River, inflow loading, algal productivity, finite volume model概要：抄録：The Chikugo Barrage is located at 23 km upstream from the mouth of the Chikugo River, which is the largest river in the Northern Kyushu Region of Japan. Main purposes of the Chikugo Barrage are flood control, water supply, maintaining flow of the Chikugo River and preventing effect of seawater intrusion from the Ariake Sea. There are two rivers flowing into the reservoir, the Chikugo River (the main stream) and the Homan River (a tributary). According to water intake for urban area and irrigation and the operation of the Chikugo Barrage, previous researches reported that the hydraulic retention time (HRT) in the reservoir of the Chikugo Barrage became longer and resulted in high growth of phytoplankton in the reservoir during 1985-2008, while inflow loading was a cause of high phytoplankton when HRT was short. In this study, relationship between loading from upstream, HRT, algal productivity and water quality in the Chikugo Barrage Reservoir was analyzed by using water quality model. Calculated results confirm that chlorophyll-a (Chl-a) in the reservoir increased when inflow loading was high or when the HRT in the reservoir was long. Algal productivity significantly affected on the nutrient level and also led to the increase in COD and SS in the reservoir. Without loading from the Homan River, simulated result of COD in the reservoir became lower indicating that loading from the Homan River has subsidiary impact on concentration of algae in the reservoir. Since the result of loading analysis shows that ratio of Chl-a loading from the Homan River to the main stream tends to increase, loading control in the Homan River Basin is suggested as an effective measure for water quality management in the Chikugo Barrage Reservoir.英語フィールド
Author：N. Vongthanasunthorn, H. Sasaki, K. Koga, M. Sakata, and K. TabiraTitle：Impact of Inflow Loading and Algal Productivity on Water Quality in the Chikugo Barrage Reservoir, JapanAnnouncement information:Thai Environmental Engineering Journal Vol: 33 Issue: 2 Page: 1-11Keyword：Chikugo Barrage, Homan River, inflow loading, algal productivity, finite volume modelAn abstract：The Chikugo Barrage is located at 23 km upstream from the mouth of the Chikugo River, which is the largest river in the Northern Kyushu Region of Japan. Main purposes of the Chikugo Barrage are flood control, water supply, maintaining flow of the Chikugo River and preventing effect of seawater intrusion from the Ariake Sea. There are two rivers flowing into the reservoir, the Chikugo River (the main stream) and the Homan River (a tributary). According to water intake for urban area and irrigation and the operation of the Chikugo Barrage, previous researches reported that the hydraulic retention time (HRT) in the reservoir of the Chikugo Barrage became longer and resulted in high growth of phytoplankton in the reservoir during 1985-2008, while inflow loading was a cause of high phytoplankton when HRT was short. In this study, relationship between loading from upstream, HRT, algal productivity and water quality in the Chikugo Barrage Reservoir was analyzed by using water quality model. Calculated results confirm that chlorophyll-a (Chl-a) in the reservoir increased when inflow loading was high or when the HRT in the reservoir was long. Algal productivity significantly affected on the nutrient level and also led to the increase in COD and SS in the reservoir. Without loading from the Homan River, simulated result of COD in the reservoir became lower indicating that loading from the Homan River has subsidiary impact on concentration of algae in the reservoir. Since the result of loading analysis shows that ratio of Chl-a loading from the Homan River to the main stream tends to increase, loading control in the Homan River Basin is suggested as an effective measure for water quality management in the Chikugo Barrage Reservoir.