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首页> 外文期刊>Advances in Water Resources >Improved numerical modeling of morphodynamics of rivers with steep banks
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Improved numerical modeling of morphodynamics of rivers with steep banks

机译：陡岸河道形态动力学的改进数值模拟

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摘要

The flow and sediment transport processes near steep streambanks, which are commonly found in meandering, braided, and anastomosing stream systems, exhibit complex patterns that produce intricate interactions between bed and bank morphologic adjustment. Increasingly, multi-dimensional computer models of riverine morphodynamics are used to aid in the study of these processes. A number of depth-averaged two-dimensional models are available to simulate morphologic adjustment of both bed and banks. Unfortunately, these models use overly simplified conceptual models of riverbank erosion, are limited by inflexible structured mesh systems, or are unable to accurately account for the flow and sediment transport adjacent to streambanks of arbitrary geometry. A new, nonlinear model is introduced that resolves these limitations. The model combines the river morphodynamics computer models TELEMAC-2D and SISYPHE of the open source TELEMAC-MASCARET suite of solvers with the bank erosion modules of the CONCEPTS channel evolution computer model. The performance of the new model is evaluated for meander-planform initiation and development. The most important findings are: (1) the model is able to simulate a much greater variety and complexity in meander wavelengths; (2) simulated meander development agrees closely with the unified bar-bend theory of Tubino and Seminara (1990); and (3) the rate of meander planform adjustment is greatly reduced if the wavelength of alternate bars is similar to that of meanders. Published by Elsevier Ltd.
机译：陡峭的河岸附近的水流和泥沙输送过程通常在蜿蜒的，辫状的和吻合的河流系统中发现，呈现出复杂的模式，在河床和河床形态调整之间产生复杂的相互作用。河水形态动力学的多维计算机模型越来越多地用于辅助这些过程的研究。可以使用许多深度平均的二维模型来模拟河床和河床的形态调整。不幸的是，这些模型使用了过分简化的河岸侵蚀概念模型，受到不灵活的结构化网格系统的限制，或者无法准确地解释任意几何形状的河岸附近的水流和泥沙输送。引入了一个新的非线性模型来解决这些限制。该模型将开源TELEMAC-MASCARET求解器套件的河流形态动力学计算机模型TELEMAC-2D和SISYPHE与CONCEPTS通道演化计算机模型的河岸侵蚀模块相结合。对新模型的性能进行了评估，以评估弯道平台的形成和发展。最重要的发现是：（1）该模型能够模拟弯曲波长更大的多样性和复杂性； （2）模拟的曲折发展与Tubino and Seminara（1990）的统一弯曲理论相吻合。 （3）如果交替条的波长与弯曲的波长相似，则弯曲平面形状的调整率将大大降低。由Elsevier Ltd.发布

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  • 来源
    《Advances in Water Resources》 |2016年第7期|4-14|共11页
  • 作者

    Langendoen Eddy J.; Mendoza Alejandro; Abad Jorge D.; Tassi Pablo; Wang Dongchen; Ata Riadh; Abderrezzak Kamal El Kadi; Hervouet Jean-Michel;

  • 作者单位

    ARS, USDA, Natl Sedimentat Lab, Oxford, MS USA;

    Univ Pittsburgh, Dept Civil & Environm Engn, Pittsburgh, PA USA|Metropolitan Autonomous Univ, Dept Basic Sci & Engn, Lerma De Villada, Mexico;

    Univ Pittsburgh, Dept Civil & Environm Engn, Pittsburgh, PA USA;

    Natl Lab Hydraul & Environm LNHE, EDF R&D, Chatou, France|St Venant Lab Hydraul, Chatou, France;

    Natl Lab Hydraul & Environm LNHE, EDF R&D, Chatou, France|St Venant Lab Hydraul, Chatou, France;

    Natl Lab Hydraul & Environm LNHE, EDF R&D, Chatou, France|St Venant Lab Hydraul, Chatou, France;

    Natl Lab Hydraul & Environm LNHE, EDF R&D, Chatou, France|St Venant Lab Hydraul, Chatou, France;

    Natl Lab Hydraul & Environm LNHE, EDF R&D, Chatou, France|St Venant Lab Hydraul, Chatou, France;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Bank erosion; Meander migration; Numerical model; TELEMAC;

    机译：银行侵蚀;弯道迁移;数值模型;TELEMAC;

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