Trend Analysis of Runoff and Ecological Regulation in Downstream of Zhanghe River
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Abstract:
The annual variation trend and variation stability degree of runoff in the downstream of Zhanghe River were analyzed using the Mann-Kendall trend method and coefficient of variation method based on the collected data from 1962 to 2006, which provided the evolution of river flow in the downstream of Zhanghe River. On the basis, a multi-objective ecological regulation model of reservoirs was developed according to the objectives of flood control, water conservancy, and ecological environment. The model was used to perform ecological regulation on the Yuecheng reservoir in the downstream of Zhanghe River using the particle swarm optimization method. The results showed that the model can realize the multi-objective regulation in consideration of the flood control, water supply, and ecological requirements. The regulation results suggested that the runoff in the downstream of Zhanghe River has a significant decreasing trend with a large annual variation, and the Yuecheng reservoir can deeply affect the hydrological conditions in the downstream of Zhanghe River. During the flood season of wet year, Zhanghe River discharge can meet the water demand, while the water scarcity situation was serious in the normal and dry years. In the other time periods except for flood season, water release from reservoir regulation was needed to avoid the occurrence of drying in the river.
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