The study of Changjiang River catchment flood prevention system operation

摘要

The study area of the paper is Changjiang basin flood prevention synthetic operation system from Etan Reservoir to Wuhan city, composed of 4 reservoirs in upstream river, Three Gorges Reservoir, Geheyan Reservoir, 3 Reservoirs of Dongting lake branch rivers, dikes and flood diversion area in middle reach. It is known that Three Gorges Reservoir is a key Project of the flood prevention system. Network analysis method is found the application for the complicated flood prevention system operation. The achievements as following: large basin Changjiang flood prevention system time-space network structure model is presented; the corresponding method in which network model is combined with flood routing model from Yichang to Hankou is obtained. The results show that the flood prevention system ability can be evidently enhanced by the reasonable integrated operation of reservoirs in main and branch rivers. Because of the characteristics of its distinct model structure and fast calculation rate etc., network analysis model is practicable, has its advantage for large basin flood prevention system real time operation according to the variation of inflow, obtaining various schemes for decision-maker to consult. The presented paper is a part of research achievement of National Natural Science Fund (No. 50099620), Hohai University Science Fund (99538473).