论文部分内容阅读
受泥石流入汇影响 ,主河床随不同河段级配常呈显著差别。特设计了 1 0组床沙分段组成的粗化模式进行试验 ,认为清水冲刷只有在该段上游没有泥沙起动输移至研究区域时 ,才是严格意义上的清水冲刷粗化 ,否则应研究上游区段冲刷输移量及其沿程沉积量和对下游区域的影响程度。此外 ,还研究了受分段影响区域的初始和粗化稳定后床面高度统计量变化幅度以及稳定后沙粒阻力的表示方法 ,得出了利用床面高度变化统计量均方差σ比用床面糙度尺寸Ks选取的代表粒径更能体现综合糙率曼宁系数n值。
Affected by debris flow into the exchange, the main river bed with different river grading often showed significant differences. We designed a coarsening mode consisting of 10 sets of bed-sand segments and concluded that water scouring is strictly water-scouring and roughening only when no sediment starts to migrate to the study area in the upper reaches of the segment. Otherwise, Study the upper reaches of the amount of erosion and transport along the sediment deposition and the extent of the impact on the downstream area. In addition, the variation of bed height statistics and the expression of sand resistance after stabilized by the initial and the coarsening stability of the sectionally affected area are also studied. The results show that the mean square deviation σ The representative particle size selected by the surface roughness Ks can better reflect the Manning coefficient n value of the comprehensive roughness.