The Study and Development of Reservoir Eco-operation Decision Support System Based on RVA Framework
|School||Huazhong University of Science and Technology|
|Course||Water Resources and Hydropower Engineering|
|Keywords||water regime RVA framework ecological flow eco-hydrological events ecological - economic equilibrium ecological operation Three Gorges -Gezhouba cascade reservoir decision support system|
With the success of Three Gorges reservoir impounding to 175 meters, the public is more and more concerning the adverse ecological consequences of reservoir operation. Large reservoirs bring tremendous benefits to human society in power generation, flood control, shipping, industrial and agricultural water supply. Also they greatly undermine the health of river ecosystem health. How to balance ecological benefits and economic benefits is where the hotspot and difficulty of reservoir operation lie. And this study also lies.First, the eco-environmental stress caused by reservoir operation in general case is studied. Then the relative research results at home and abroad are summarized. According to the operation of Three Gorges-Gezhouba cascade reservoir, from the view of hydrological point, the eco-environmental stress which reservoir operation brings is analyzed.Second, according the important role which dynamic characteristics of the river ecosystem health of rivers plays in the hydrological system, the dynamic characteristics which described by regime and the ecological flow which guided by the RVA framework are proposed, then considering the ecological demand of freshwater habitat in different life stages and the seasonal changes of environmental factors in water, the methods for ecological flow calculation which oriented to the non-parametric statistics of eco-hydrological events are established. On the base of these, aiming at upper and middle Yangtze River which Three Gorges cascade reservoir is located, taking Yichang station as the typical section, the ecological flow process which considers the restoration of whole river ecosystem and specific protection of freshwater habitat is analyzed.Third, the ecological operation model of cascade reservoirs which takes the ecological runoff as constraints is established, and the corresponding algorithm is also given. The eco-suitability evaluation index system which considers the dynamic characteristics of the river is proposed. The this paper take the Three Gorges cascade reservoir as a research object, combines the ecological flow which analyzed above, the ecological operation from the restoration of whole river ecosystem and specific protection of freshwater habitat is studied. Combined with the eco-suitability evaluation index system, a variety of non-inferior solutions are proposed based on the conflict of ecological indicators and ecological economic benefits, then the multi-attribute decision model of TOPSIS is adopted and the solutions is optimized.Fourth, this paper takes the research above as a basis, uses the development environment of Delphi2010, combines with Microsoft SQL Server database engine, and develops the decision support system for cascade reservoir ecological operation in upper and middle Yangtze River which considers ecological restoration and conservation and based on three-layer architecture. The system includes the functions such as ecological information management, ecological evaluation management, ecological flow analysis, ecological operation and GIS display which provides strong support for policy makers to develop a reasonable ecological operation scheme.