梯级泵站输水系统调蓄水池容量变化特征

Variation Characteristics of Reservoir Capacity in Water Transfer System of Cascade Pumping Station

为解决我国西北缺水地区梯级泵站系统因超负荷、大流量、高水位运行出现垮渠、跳闸停机的问题,以甘肃省景电二期多梯级输水系统为例,采用数值模拟、理论分析与现场调查相结合的方法研究了梯级泵站事故停机后泵站输水系统调蓄水池的变化特征,建立了泵站停机后输水系统调蓄池容积的理论表达式。结果表明,泵站停机后各泵站溢流曲线呈二次函数抛物线形状,影响各渠道溢流量的主要因素为渠道长度和坡降;泵站停机后计算输水系统调蓄池容积的修正公式与工程实际情况高度吻合。

In order to solve the problems of canal collapse and tripping in the cascade pumping station system due to overload,large flow and high water level operation in the northwest of China,this paper takes the multi-cascade water transmission system of Jingdian Phase II in Gansu Province as the research object.By using the methods of numerical simulation,theoretical analysis and field investigation,the paper studies the variation characteristics of the reservoir of the water transfer system of the cascade pump station after the accident shutdown,and establishes the theoretical expres-sion of the reservoir volume of the water transfer system after the shutdown of the pump station.The results show that the overflow curves of each pump station after the pump station is shut down exhibit a quadratic parabolic shape,and the main factors affecting the overflow flow of each channel are the length and slope of the channel;The correction formula for calculating the volume of the water transfer system storage tank after the pump station is shut down is highly consist-ent with the actual engineering situation.