河道冲淤变化分析由于玉龙喀什河与喀拉喀什河出山口以下处在第四系松散堆积的冲积洪积倾斜平原上,河床由卵石、砾石以及细沙组成,河槽不稳定,主流摆动大,尤其是下游河道平均纵坡变缓,水流速度减少,大量泥沙沉积在河床中,所以泥沙问题对于防洪抗旱意义重大。但由于缺少沿程纵、横断面冲淤变化资料,给分析工作带来困难。河床变化是极为复杂的问题,特别是平原区河段的河床演变必须专门组织力量专题 River scouring and silting changes analysis As the Yulong Kashi River and the Karakashi River out of the mouth below Quaternary fluvial alluvial accumulation alluvial plain, the riverbed is composed of pebbles, gravel and fine sand, the channel instability, the mainstream swing, especially The average longitudinal slope of the lower reaches of the river slows down, the velocity of the water flow decreases, and a large amount of sediments are deposited in the riverbed. Therefore, the sediment problem is of great significance for flood control and drought relief. However, due to the lack of vertical and horizontal cross-section scouring and silting changes in information, to the analysis of the difficulties. River bed changes are extremely complex issues, especially the plain riverbed evolution of the river bed must be specially organized forces topic