基于泥沙淤积的水库灌溉库容分析

Analysis of Reservoir Irrigation Capacity Based on Sediment Deposition

水库库容主要受泥沙淤积、蒸发和渗漏制约,而这些又受入库洪水影响。为了科学确定府谷县某水库灌溉库容能力,基于支沟和水库基本情况,采用铁一院法、推理公式法、经验公式法,在分析河道入库洪水的基础上,对水库的淤积、蒸发和渗漏情况进行探讨。结果显示,水库设计库容满足工程灌溉用水量需求,目前库死水位为1614 m,现状库容只有86万m^(3),需通过库区开挖清淤平整处理扩大灌溉库容,以满足灌溉用水需求,可为水库防洪灌溉和效益发挥提供科学依据。

The reservoir storage capacity is mainly restricted by sediment deposition,evaporation and leakage,which are affected by the inflow flood.In order to scientifically determine the irrigation capacity of a reservoir in Fugu County,based on the basic situation of branch ditches and reservoirs,the sedimentation,evaporation and leakage of the reservoir were discussed on the basis of analyzing the inflow flood of the river by using the method of Tieyiyuan,reasoning formula and empirical formula.The results show that the design capacity of the reservoir meets the demand of irrigation water.The current dead water level of the reservoir is 1614 m,and the current capacity is only 860,000 m^(3).It is necessary to expand the irrigation capacity through the excavation,dredging and leveling of the reservoir area to meet the demand of irrigation water,which can provide scientific basis for flood control irrigation and benefit play of the reservoir.