review of hydrologic and hydraulic methods to determine instream environmental flow
首发时间:2008-04-11
Abstract:To provide to their lives, humans need water. So it is used for irrigation purposes, energy (hydropower station), water supply and so on. Then reservoirs, dams and weirs have been constructed to manage the resource. Unfortunately, the trend has cost a lot in many part of the globe and waters are been misused. Moreover, the population growth is widening the needs. But water is not well treated and is loosen quality. As water and streams are related with their environment fauna and flora subsistence, the ecology is then threatened. Scientist are now looking for the way to restorate environmental flows or prevent the depletion on the waters. Here are first hand methods that are used to assess the state of the waters. Hydrologic methods are used where hydrologic records are available. The range of variability approach based on indicators of hydrologic alteration is a statistical tool that offers a view of the difference between two states, waters or streams. It gives range on which the flows should varied. The Tennant method and aquatic base flow method are region specific. But Tennant method ameliorated by Tessmann is can be used anywhere with some adjustments. The application of the Wetted-Perimeter and R2Cross methods requires development of a stage-discharge relation for a riffle and determination of three hydraulic parameters (mean depth, mean velocity, and wetted perimeter) for a range of flows. Those are hydraulic methods and historic data are useless in these cases.
keywords: instream minimum flow methods
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review of hydrologic and hydraulic methods to determine instream environmental flow
摘要:To provide to their lives, humans need water. So it is used for irrigation purposes, energy (hydropower station), water supply and so on. Then reservoirs, dams and weirs have been constructed to manage the resource. Unfortunately, the trend has cost a lot in many part of the globe and waters are been misused. Moreover, the population growth is widening the needs. But water is not well treated and is loosen quality. As water and streams are related with their environment fauna and flora subsistence, the ecology is then threatened. Scientist are now looking for the way to restorate environmental flows or prevent the depletion on the waters. Here are first hand methods that are used to assess the state of the waters. Hydrologic methods are used where hydrologic records are available. The range of variability approach based on indicators of hydrologic alteration is a statistical tool that offers a view of the difference between two states, waters or streams. It gives range on which the flows should varied. The Tennant method and aquatic base flow method are region specific. But Tennant method ameliorated by Tessmann is can be used anywhere with some adjustments. The application of the Wetted-Perimeter and R2Cross methods requires development of a stage-discharge relation for a riffle and determination of three hydraulic parameters (mean depth, mean velocity, and wetted perimeter) for a range of flows. Those are hydraulic methods and historic data are useless in these cases.
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No.2037921812312079****
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review of hydrologic and hydraulic methods to determine instream environmental flow
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