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首页> 外文期刊>Ecology, Environment and Conservation >Application of HEC-RAS model for evaluating erosion and sedimentation of Karkheh river, Iran
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Application of HEC-RAS model for evaluating erosion and sedimentation of Karkheh river, Iran

机译：HEC-RAS模型在伊朗卡尔赫河侵蚀与沉降评估中的应用

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摘要

Using numerical models is an adequate tool for simulating erosion phenomenon and sediment transport conditions of the rivers that can be the basis for planning and implementation of water and environmental engineering projects. Karkheh Basin is one ofthe most important watersheds of Iran which belongs to Karkheh River (the third biggest river of Iran). However, the Karkheh River has strategical and environmental importance for design and implementation of large hydrological projects and supplying water for agricultural, industrial and municipal units but, there is no reliable and academic documentation about its erosion and sediment transport especially after the reservoir dam construction. Hence, the famous model of HEC-RAS has been utilized for simulating the sediment transport and erosion of Karkheh River during 12 years (2001-2013) downstream of the reservoir dam. Therefore, Thalweg and cross section alternations were estimated and the total sediment load of Karkheh River was determined at thestudy site. The results indicate increasing of erosion at the river post-dam which would be reduced in the middle and distal portion. The model outcomes showed that Sediment transport equations such as Ackers-White, Laursen and Engelund-Hansen have beenprovided the most accurate predictions of changes in erosion and sedimentation of the river. Moreover, the results from morphology section of model present that reservoir dam construction has failed to prevent displacement of Karkheh River central axis.Our survey would be a basic reference for future engineering experiments on Karkheh River and effects of dam construction on alluvial rivers.
机译：使用数值模型是模拟河流侵蚀现象和输沙条件的适当工具，可以作为水利和环境工程项目的计划和实施的基础。卡尔赫盆地是伊朗最重要的流域之一，属于卡尔赫河（伊朗第三大河）。然而，卡尔赫河对于大型水文项目的设计和实施以及为农业，工业和市政单位供水都具有战略和环境重要性，但是，关于其侵蚀和泥沙输送，尤其是在水库大坝建成后，没有可靠的学术文献。因此，著名的HEC-RAS模型已被用于模拟库克河下游12年（2001-2013年）内喀尔赫河的泥沙输送和侵蚀。因此，在研究地点估算了Thalweg和断面的交替，并确定了Karkheh河的总泥沙量。结果表明，大坝后河的侵蚀增加，而在中部和远端的侵蚀将减少。该模型的结果表明，泥沙运移方程式（如Ackers-White，Laursen和Engelund-Hansen）已被提供为河流侵蚀和沉积变化的最准确预测。此外，从模型的形态学部分得出的结果表明，水库大坝的建设未能阻止Karkheh河中轴线的位移。我们的调查将为今后在Karkheh河上进行的工程实验以及大坝建设对冲积河的影响提供基础参考。

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