黄河宁夏典型弯道段河道整治试验研究

Experimental Study on River Regulation of Typical Bend Section of Yellow River in Ningxia

针对黄河宁夏石嘴山弯曲河段凹岸不断冲刷的现状,结合护岸丁坝工程,在四排口河段采用丁坝群及开挖引流综合河道治理措施,保护岸坡稳定并实现裁弯取直.利用声学多普勒测流仪和激光粒度分布仪测试和分析得出:丁坝群上、中游段主流及主槽向凸岸发展,丁坝群下游段主流仍趋向凹岸;近左岸、河道中心、右岸的平均中值粒径分别为16.748,15.196,13.442μm.结果表明,弯道内设置丁坝群及开挖引流后,主河槽向凸岸发展,有效改善了凹岸区域的冲刷,该方法在稳定弯道水流,防止岸坡冲淤方面有较好的效果.

In view of the current situation of continuous erosion of the concave bank of the Shizuishan curved section of the Yellow River in Ningxia,based on Revetment Spur Dam Project,the treatment of setting spur dikes combined with excavating drainage are adopted to Sipaikou reach,in order to protect bank slope stability and achieve the curve cut-off.The test results of the acoustic Doppler flow meter and laser particle size distribution meter show that the development of the main stream and the main trough toward the convex bank in the upper and middle reaches of the spur group;the mainstream of the downstream section of spur dike group still tend concave bank;the average median particle size near the left bank,channel center and the right bank is 16.748,15.196,13.442μm,respectively.The result shows that:setting the spur dike group in the curve can effectively improve the erosion of the concave bank area.The main channel develops towards the convex bank,it means that the arrangement of the spur dike group combined with the excavation drainage have a good effect on stabilizing the flow of the bend and preventing the bank slope from washing.