长江中下游河道崩岸整治及河势控制对策

长江中下游干流河道主长1 893 km，由于河道冲淤变化、堤防长年失修、以及上游建库拦沙作用等影响，导致河势变化复杂、局部河段崩岸严重、航道淤积阻塞等问题，对中下游防洪与航道安全以及沿岸经济社会发展造成严重的不利影响。1998年大洪水过后，由国家投资完成了以堤防加固为主的护岸工程建设，但由于规划中的后续综合整治工程尚未实施，不利于中下游河道综合治理工程总体效益的发挥。同时，受三峡等上游水库拦沙造成的清水下泄引起的河道冲刷与江湖水沙变化关系的影响，亟待加快后续规划项目的实施，通过加强工程措施与非工程措施，确保长江中下游河势稳定、防洪与航运安全，以及沿江地区经济社会的可持续发展。

Bank collapse harness and river regime control countermeasures for middle and lower reach of the Yangtze River

The main stem of the middle and lower reach of the Yangtze River is 1 893 km long.The river channel scouring and silting,embankment disrepair,and sediment retaining by upstream reservoirs resulted in complicated river regime change,local severe embankment collapse,navigation channel silted etc.,and bring about unfavorabel influnece on flood control,navigation channel safety and economic and social development along the shore.After 1998 big flood,the government invested to strengthen the embankment,but the planned subsequent comprehensive regulation works unconstructed,the general benefit of comprehensive regulation works for the middle and lower reach of the Yangtze River can not be given full play.In the meantime,influenced by sediment retaining and clearer water discharge of TGP reservoir,the river channel is scoured,the flow and sediment relation between the Yangtze River and the lakes changed,the planned subsequent works should be constructed as early as possible.The structure measures and non-structure measures should be strengthened to guarantee the river channel stable,flood and navigation safe and economic and social development along the Yangtze River.