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首页> 外文期刊>Journal of the American Water Resources Association >COMPARISON OF MORPHODYNAMIC MODELS FOR THE LOWER YELLOW RrVER
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COMPARISON OF MORPHODYNAMIC MODELS FOR THE LOWER YELLOW RrVER

机译：下黄河流动力学模型的比较

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摘要

Significant channel adjustments often occur during flood seasons in the Lower Yellow River (LYR), and it is a challenging work to accurately simulate the morphodynamic processes in the LYR using numerical models. A comparison of two morphodynamic models (Delft3D and 2DLLCDM) for the LYR is presented herein to identify critical improvements for these models. The concepts of these models are first compared with each other. The models were then used to simulate the processes of flood routing, sediment transport, and morphological changes occurring in a braided reach of the LYR. The differences were investigated between the simulated results from these models and corresponding field measurements, and the results indicate that: (1) the hydrody-namic processes calculated by both models agree closely with the measurements if an appropriate Manning's roughness coefficient is used; (2) the concentrations of suspended load at the downstream boundary calculated by the models agree reasonably with the observed data; and (3) the predicted cross-sectional profiles obtained from these models do not correspond well with the measurements. Based on these findings, the weak aspects of the models are clarified, and three critical improvements are recommended, including: (1) the development of roughness predictor; (2) the refinement of graded sediment transport capacity formulation; and (3) the consideration of bank erosion module. These improvements need to be implemented in the future.
机译：在黄河下游（LYR）的洪水季节，经常会发生重要的河道调整，而使用数值模型来精确模拟LYR的地貌动力学过程是一项艰巨的工作。本文介绍了LYR的两个形态动力学模型（Delft3D和2DLLCDM）的比较，以确定这些模型的关键改进。首先将这些模型的概念进行比较。然后，使用这些模型来模拟LYR编织带中洪水泛洪，泥沙输送和形态变化的过程。研究了来自这些模型的模拟结果和相应的现场测量结果之间的差异，结果表明：（1）如果使用适当的曼宁粗糙度系数，则两个模型计算的水动力过程与测量结果非常吻合； （2）模型计算得出的下游边界处的悬浮物浓度与观测数据合理吻合； （3）从这些模型获得的预测横截面轮廓与测量值并不十分吻合。基于这些发现，阐明了模型的弱点，并建议了三个关键的改进，包括：（1）粗糙度预测器的开发； （2）完善输沙能力分级公式； （3）考虑河岸侵蚀模块。这些改进需要在将来实现。

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