A PRIMARY STUDY ON THE STRATEGIES WITH DREDGE-DISCHARGE MIDDLE REACHES BASIN OF THE YANGTZE RIVER

The Middle Reaches Basin of the Yangtze River is a natural—economic—social complex ecosystem, the flood and wa-terlogging disasters are frequently and sereously in this area. For permanently hamess the flood and waterlogging disasters, ac-cording to the law of flood occurrence to regulate the relation between human and nature, and to change the status of protectingNorthem (Jianghan Plain)-abandoning Southern (Dongting Lake Plain) as well as pay attention to storage but dipiting dischargefor long time, and implementation of the strategies with dredge-discharge as key measures for flood-prevention as well as theconstractions of the appropriate engineerings and nonengineerings (such as: change the meandering river coures; dredge new riv-er coures for flood diversion; diversion of riversystem between southern and northern in the Dongting Lake; interbasin water trans-fer from Yangtze River to Northern China etc.) are needed. At the same time, the headwater ecological engineerings and the reg-ulation engineerings construction by rivers-reservoirs-lakes are also very importent.