南水北调中线小南河串流片防洪水位计算

传统的多河流串流计算主要采用水库联调的方法,把串流的各条河流概化为静态水库,库水位水平且不考虑横向流动。为解决串流区水流的横向流动及水面线并不总像库水位一样水平的问题,采用二维非恒定流数学模型计算串流区洪水演进。通过概化地形、考虑入流、糙率、边界条件和水流的横向流动等因素,计算出了整个串流区域的水面线、水深、流速、出流等水力要素,并给出洪水演进模拟图,为确定河流与总干渠交叉建筑物的规模、总干渠左岸沿线水面线和对沿线村庄、农田的防洪影响提供了可靠的依据。

Flood Surface Calculating of Overflow-Area Section of Xiaonan River in the Middle-Route of South-to-North Water Diversion Project

The traditional method of overflow-area calculating is reservoir joint dispatching,which Abstracts the rivers of overflow-area as re servoirs,and regards the water level of reservoirs as horizontal and do not consider the lateral flow.In order to solve the problems caused by the above assumptions,this paper uses the two-dimension unsteady flow mathematical model to simulate the flood evolution of overflow-area rivers.The two-dimension unsteady flow mathematical model calculates the hydraulic elements such a...