Research On Water Environment Simulation And Water Quality Assessment Of The Cascade Hydropower Plant In The Supa River Basin

Water and electricity engineering construction, especially the exploitation of cascade hydropower plant arises a series of ecological environmental problems, which is the bottleneck of the basin sustainable development. In order to the ecological environmental protection of basin, it is necessary to study the impact on ecosystem, simulate water environment of the basin and set up a simple and accurate evaluation model. It can not only improve the administrator's decision management level, but also has important theory and realistic meaning to realize the basin sustainable development.A method which combines fuzzy mathematics, genetic algorithm and neural network was put forward, and was used in water quality assessment on the basin. A one-dimensional water quality model was set up for the water quality distribution of the basin. The Dillon model was adopted to forecast the concentration of nitrogen and phosphorus in the reservoir. GIS and 3ds max were employed to realize the visual simulation of the soil erosion protection project. The calculation of the water required for ecological environment of the river was carried on to propose the ecological environment protective measures in the basin. Finally, the environmental information management system of the Supa river basin was set up to be a part of the administration system. The results show that the water quality of all section are classⅠin the basin, the result of the comprehensive assessment of water quality with subordinate degree-genetic neural network model is objective, concrete and exact. The simulation result of one-dimensional water quality are in agreement with the monitored values. The concentration of nitrogen and phosphorus in the reservoir will be accorded with the national standards, thus it will not cause eutrophication in the running period. The visual simulation reflects the virtual reality of soil erosion protection protect of Supa river basin, the finished scene is visualized in three-dimensional animation, and realizes the scene roaming, providing a scientific, effective and visual analyzing method for the management and decision-making associated with the construction. The water demand for ecological environment in Chaoyang, Wuni River, Ajiutian on Supa River basin is 1.54×108 m3, 3.31×108 m3, 3.56×108 m3 separately, it is 48.9%, 44.9%, 52.3% of the runoff, the water demand for sediment transport is all occupied above 99%. So during the hydroelectric development, the key for protecting the environment of Supa river basin is to control soil erosion and bring down the water demand for sediment transport. The environmental management information system is in favor of accelerating the systematization and informatization of Supa river basin, having solved the simulation calculated and dynamic display problem well, there is a wide application prospect in the environmental management of other basins. This research results offers effective and economic decision information for hydropower engineering and environmental administrative department.