Author(s): Yuichi Kayaba; Minoru Kobayashi; Syoji Igarash; Akira Suzuki
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Keywords: Environmental studies; Estuary barrage; Monitoring; Nagara river
Abstract: From the viewpoint of an administrative organization, this report briefly describes the monitoring that has been continued for ten years from 1995 to 2004 for the management of the Nagaragawa Estuary Barrage, including the environmental studies conducted before the barrage construction. The monitoring has been conducted by the Ministry of Construction (now the Ministry of Land, Infrastructure and Transport) and Water Resources Development Public Corporation (now Japan Water Agency) while the estuary barrage is in operation. The post-construction monitoring has been conducted under the guidance of the Nagaragawa Estuary Barrage Monitoring Committee and its successor, the Chubu Region Dam Management Follow-up Committee (Dam Subcommittee). Monitoring results are published in the form of annual reports. The monitoring covers major categories such as fauna and water-edge flora including DO, BOD, salt content, water temperature, chlorophyll-a, bottom sediment, fish species, benthic fish species, shellfish species, reed fields, animals and water-edge plants. This report describes the monitoring methods and results associated with the monitoring sites and changes of some of the target species. Monitoring results are being reflected in the management of the lower reaches of the Nagara River. The Ministry of Construction (now the Ministry of Land, Infrastructure and Transport) and Water Resources Development Public Corporation (now Japan Water Agency) decided to continue the monitoring in 2005. A new series of follow-up monitoring is already underway under the guidance of the Chubu Region Dam Management Follow-up Committee.
Year: 2005