Modeling Bed-Load Rates from Fine Grain-Size Patches during Small Floods in a Gravel-Bed River
Modeling Bed-Load Rates from Fine Grain-Size Patches during Small Floods in a Gravel-Bed River
复制标题
砾石河床小洪水期间细粒度斑块的床荷率建模
DOI：
10.1061/(asce)0733-9429(2008)134:10(1430
复制
发表时间：
2008
影响因子：
2.4
通讯作者：
A. Bronstert
中科院分区：
文献类型：
--
作者：
E. Mueller;R. Batalla;Celso García;A. Bronstert
本研究探讨的适用性五推移质输运公式（迈耶-彼得和穆勒，Schoklitsch，Bagnold，智能和Jaeggi，和Rickenmann方程）预测推移质输运率频繁，低量级的洪水事件（最大平滩流量）的山区，分选不良的砾石床河流的特点是双峰沉积物粒径分布和空间分布的补丁。对于模型参数化，特别强调的是放在粒度分布（GSD）的空间组成，以评估优先去除的沉积物与更细的沉积物对推移质输运的补丁的影响。测试了三种选择适当沉积物粒度的参数化方法，这些方法在不同程度上考虑了GSD的表观双峰性。模型研究表明，纳入的空间结构的GSD和其双峰特性有重要影响的模型性能的单峰参数化未能再现测量。
This study investigates the applicability of five bed-load-transport formulas (the Meyer-Peter and Muller, Schoklitsch, Bagnold, Smart and Jaeggi, and Rickenmann equations) to predict bed-load transport rates of frequent, low-magnitude flood events (maximal bankfull discharge) for a mountainous, poorly sorted gravel-bed river characterized by a bimodal sediment-size distribution and spatially distributed patches. For model parametrization, special emphasis was placed on the spatial composition of the grain-size distribution (GSD) to evaluate the impact of preferential removal of sediments from patches with finer sediments on bed-load transport. Three parametrization approaches to the choice of an appropriate sediment size that considered the apparent bimodality of the GSD to varying degrees were tested. The modeling study demonstrated that the incorporation of spatial structure of GSD and its bimodal character has an important impact on model performance—a unimodal parametrization failed to reproduce meas...