Influence of horizontal eddy viscosity and bottom friction coefficients on morphodynamic evaluations

IF 2.4 3区 环境科学与生态学 Q2 ENGINEERING, CIVIL Journal of Hydro-environment Research Pub Date : 2022-01-01 DOI:10.1016/j.jher.2021.12.005
N. Saichenthur, K. Murali, V. Sundar
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引用次数: 6

Abstract

The horizontal eddy viscosity (ε) and bottom friction coefficient (Kbr) are important hydrodynamic parameters in the computation of flow fields that dictate the morphodynamics. The effect of the variations in ε and Kbr as well as their combination on the prediction of hydrodynamics and morphodynamics in the Cochin harbor and adjoining nearshore area (9.9312° N, 76.2673° E) has been investigated in detail. A tidal circulation model to solve the shallow water equation is applied with the different parameterizations of ε and Kbr. In order to understand its effect, ε is expressed as a function of depth averaged velocity and length scale of computation mesh, whereas Kbr is expressed as a function of depth. The validation of the model is carried out with the measured currents. The improvement in the hydrodynamic and morphodynamic predictions is demonstrated by implementing the spatially and temporally varying ε The predictions are further improved by implementing a spatially varying Kbr. It is seen that the simulations with varying ε and Kbr predict the morphodynamic behavior close to the field values. The performance of the model predictions is discussed in terms of R2, RMSE and BSS (Brier Skill Score).

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水平涡流粘度和底部摩擦系数对形态动力学评价的影响
水平涡流粘度(ε)和底部摩擦系数(Kbr)是流场计算中决定形态动力学的重要水动力参数。详细研究了ε和Kbr的变化及其组合对科钦港及其邻近近岸地区(9.9312°N, 76.2673°E)水动力和形态动力学预测的影响。采用ε和Kbr的不同参数化,建立了求解浅水方程的潮汐环流模型。为了理解其作用,将ε表示为深度、平均速度和计算网格长度尺度的函数,将Kbr表示为深度的函数。用实测电流对模型进行了验证。采用时空变化的ε可以改善水动力和形态动力预测,采用时空变化的Kbr可以进一步改善预测。可以看出,ε和Kbr变化的模拟所预测的形态动力学行为与场值接近。根据R2、RMSE和BSS (Brier Skill Score)来讨论模型预测的性能。
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来源期刊
Journal of Hydro-environment Research
Journal of Hydro-environment Research ENGINEERING, CIVIL-ENVIRONMENTAL SCIENCES
CiteScore
5.80
自引率
0.00%
发文量
34
审稿时长
98 days
期刊介绍: The journal aims to provide an international platform for the dissemination of research and engineering applications related to water and hydraulic problems in the Asia-Pacific region. The journal provides a wide distribution at affordable subscription rate, as well as a rapid reviewing and publication time. The journal particularly encourages papers from young researchers. Papers that require extensive language editing, qualify for editorial assistance with American Journal Experts, a Language Editing Company that Elsevier recommends. Authors submitting to this journal are entitled to a 10% discount.
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