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首页> 外文期刊>Journal of Hydroinformatics >Studying of flow model and bed load transport in a coarse bed river: case study – Aland River, Iran
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Studying of flow model and bed load transport in a coarse bed river: case study – Aland River, Iran

机译：粗河床中的流量模型和河床荷载输运研究：案例研究–伊朗阿兰德河

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This paper describes a mathematical model which solves the 1D unsteady flow over a mobile bed.nThe model is based on the Richtmyer second-order explicit scheme. Comparison of the modelnresults with the experimental flume data for alluvial steady flow (aggradation due to overloading)nand unsteady flow shows that, by using the two-step method of Richtmyer, one can solve thenequations, governing the phenomenon, in a coupled method with the desired accuracy. Firstly,nthe Badalan reach located at the Aland River is considered. Variations of flow rate, water level andnbed level profiles due to flood hydrographs are assessed. Secondly, bed load discharge data werencollected from the Aland River and a variety of bed load discharge formulae were compared withnmeasured data. Results show that, by using the grain size of the bed surface layer to predict thenbed load discharge, a larger relative error will occur compared to the other two cases and anproper choice of grain size has the main role in reduction of the relative error of bed loadndischarge estimation in gravel bed rivers. The applicability of formulae varies depending on flownrate, and should be split into low and high flow transport formulae.
机译：本文描述了一种数学模型，用于解决移动床上的一维非恒定流。n该模型基于Richtmyer二阶显式格式。将模型结果与冲积稳定流（超载引起的凝结）和非稳定流的实验流体数据进行比较，表明，通过使用Richtmyer的两步法，可以解决方程，控制现象，并与之耦合。所需的精度。首先，考虑位于奥兰河的巴达兰河段。评估了因洪水水位计引起的流量，水位和床底剖面的变化。其次，从奥兰河收集了床荷排放数据，并将各种床荷排放公式与实测数据进行了比较。结果表明，通过使用床面层的晶粒尺寸预测床荷载的释放，与其他两种情况相比，将会出现较大的相对误差，正确选择晶粒尺寸对降低床的相对误差起主要作用砾石床河流的负荷流量估算。公式的适用性取决于流动速率，应分为高流量和低流量公式。

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