新疆叶尔羌河中游河段护岸护滩工程技术方案研究

Technical Scheme for the Revetment and Beach Protection Engineering in the Middle Reache of Yarkant River in Xinjiang

从叶尔羌河中游的水沙特性出发,结合中游脆弱的河床边界条件,分析发现恰木萨至48团渡口段依次为典型的宽浅变迁河段和宽浅游荡型河段,宽浅变迁河段的河床质较粗,小流量运移过程中汊道密布;宽浅游荡型河段河床质越来越细,小流量时主流被河心滩分开,偏向河岸的一侧,主流摆动不定。提出了中游治理思路应是:"稳定河势,防止冲刷,漫溢,局部封堵汊河、裁弯取直、稳定险工段"。结合中游河段的河道演变情况,通过对不同河段典型护岸护滩工程防护结构设计的比选论证,将中游河段从上至下划分为3种典型断面进行结构设计,优化后的防护结构设计为今后塔里木河流域的游荡型河流的护岸护滩工程建设提供有力技术保障。

Based on the fragile river bed boundary conditions of the middle reaches,we analyze and find that the section from Chamusa to the ferry of No. 48 Regiment changes from the broad-shallow shifting river to broad-shallow wandering section,the former features coarse river bed materials,and creates dense inlets in the course of small flow migration; the latter features smaller and smaller bed material grains,and the main stream is divided by the river shoal when the flow becomes small,and deflects to one side and wobbles. Based on these characteristics,we proposed the control measures for the middle reaches which are： stabilize the river region,prevent eroding and overflowing,regionally block inlets,cut curves and stabilize the dangerous sections. According to the watercourse evolution in the middle reaches,through comparison and verification of typical revetment and beach protection structure designs of different sections,we divide the middle reaches into three typical sections from the upper to the lower for the structural design. The optimized protection structure design could provide strong technical guarantee for the revetment and beach protection of the wandering rivers in the Tarim River basin in future.