Study On The Relation Of Channel Sedimentation And Water Conservancy Projection Running In Tarim River

The Tarim River is a kind of typical broad and shallow truant river. In recent 100 years, ithad changed route several times. With the increasing heavy depositions, the running ofcurrent man-made dike is threatened, and the water has over-flowed so that the consumptionof water is kept on increasing. As we know, the rule of channel brush and sedimentation isdetermined by the characters and combination of water and sand in the channel. In order tochange the circumstance and find ways to regain the balance of channel brush andsedimentation, the article analysises the characters of movable change from original stream tothe upstream of trunk channel in the Tarim River, studies the course and reason related to thechange of channel sedimentation's rule, from the angle of macro-space (from original streamto Xin Qu Man station in trunk channel) and long time (39-44 years) by using the theory andmethod of random hydrology. The article thinks it is the development of water resourcesutilization by mankind in the original stream of Tarim River that result in great reduction inrunoff and great increasing in sedimentation. Meanwhile, the relation of water and sand isalso changed. That is to say, the large water and sand in the upper reaches of original streamhas changed into small water and sand in the lower reaches of original stream and in the upperreaches of trunk channel. So the small runoff lead to channel sedimentation. To avoid andreduce channel sedimentation in the upstream of trunk channel in Tarim River, the article putsforward to many practical measures, such as channel transformation and sand control, thebetter relationship of water and sand, and so on. Furthermore, the article also points out thedirection of further study.