Ecological Operation Based On Supply-demand Equilibrium Of River Eco-environmental Water On Hongyashan Reservoir

Based on supply-demand equilibrium of river eco-environmental water, ecological reservoir operation was carried out on Hongyashan reservoir in this paper.The Hongyashan reservoir function regulation is importation and necessary. Analyzing and comparing the effects on irrigation in the pre and post the Hongyashan reservoir built, the ecological problem of the Minqin irrigation district has become the bottleneck of the present operation. Through analyses of real conditions and the existing problems of the reservoir operation, Hongyashan reservoir that only play irrigation and flood control function has not solve the downstream problems of ecological deterioration of the oasis. And shifting the reservoir function from the dual function both irrigation and flood control to the three functions of ecological, can solve the contradiction between socioeconomic benefits and ecological benefits of the irrigation district.According to the situation of the river eco-environmental demand and the ecological problem during the operation and water resources allocation in the Hongyashan reservoir control regions, the Hongyashan reservoir ecological operation has been proposed in this paper. It proceeds from the equilibrium of river eco-environmental water requirement in the reservoir downstream. The discharge volume and the level on the reservoir must be adjusted to the needs for river eco-environmental water, irrigation, and flood control. We propose an ecological reservoir operation model based-on ecological flow regime, and taken a uniform water supply process taken as the objective function, which takes the virtual water area of single reservoir as an calculation unit.Five groups'reservoir water level feasible tracks with better objective function are regarded as initial tracks of the Feasibility of Search Discrete Differential Dynamic Programming algorithm (FS-DDDP) for further optimization. Choose the 3rd scheme as the final method. This group has the obvious effect in the reservoir operation. The reservoir operation at low level and the sluicing flow more uniform than that during the current situation of Hongyashan reservoir operation. For the whole period, the supply-demand of water irrigation district can measure up equilibrium.