Calculation of bed changes in mountain streams
Calculation of bed changes in mountain streams
复制标题
山间溪流河床变化计算
DOI：
10.1061/(asce)0733-9429(1999)125:3(263
复制
发表时间：
1999
影响因子：
2.4
通讯作者：
Marco Falcón
中科院分区：
文献类型：
--
作者：
J. López;Marco Falcón
山区河流水流泥沙输移的模拟由于存在高梯度、几何形状突变、水流状态变化和大粗糙度元素而变得复杂。冲积河道冲淤预测的数值模型大多是针对低比降河流建立的。本文致力于开发一个数值模型，计算床面高程和粒度分布的变化，在山区河流中的最大床料尺寸是在漂砾的范围。尝试验证模型，通过使用观测到的现场数据收集上游的一个小拦河坝在委内瑞拉流。经过对泥沙输运方程的校正，床面物质粒度分布的变化得到了合理的一致性。一个额外的应用程序中提出的Cocorotico河，一个小山溪位于委内瑞拉西北地区，这说明了该模型的适应性，以处理的情况下，粗床物质去除的活动通道，并模拟粗化过程。
Simulation of flow and sediment transport in mountain streams is complicated by the presence of high gradients, abrupt changes in geometry, variations in regime of flow, and large roughness elements. Most of the numerical models to predict aggradation and degradation in alluvial channels have been developed for low-gradient rivers. This paper is devoted to the development of a numerical model to calculate bed elevation and grain size distribution changes in mountain streams where the maximum bed material size is in the range of boulders. An attempt is made to validate the model by using observed field data collected upstream from a small retention dam in a Venezuelan stream. After calibration of the sediment transport equation, reasonable agreement is obtained for the variations in the grain size distribution of the bed-surface material. An additional application is presented in the Cocorotico River, a small mountain stream located in the northwest region of Venezuela, which illustrates the adaptability of the model to handle a case of coarsest-bed-material removal from the active channel and to simulate the armoring process.