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首页> 外文期刊>Ocean Engineering >Parameterization of bottom friction under combined wave-tide action in the Hooghly estuary, India
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Parameterization of bottom friction under combined wave-tide action in the Hooghly estuary, India

机译：印度Hooghly河口联合波浪作用下底部摩擦的参数化

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摘要

A comprehensive knowledge of the wave climate is an essential pre-requisite for practical applications in coastal and near-shore region. In coastal areas the dominant dissipative mechanism appears to be bottom friction where the relative strength depends on bottom characteristics, sediment type and bottom ripple geometry. The present state-of-art version SWAN wave model uses three popular formulations for dissipative mechanism due to bottom interaction. The bottom friction coefficient as in SWAN cannot be a constant and needs to be tuned based on prevailing hydrodynamic conditions when applied for a tidal dominant region. A combined wave-current interaction study should take into account varying water levels, reversal of current system and associated shear on the sea-bed. The present work reports on development of a new resistance law for bottom friction under the combined action of waves and currents. This new formulation has been implemented in the SWAN model and further its implication on variability of significant wave height for the Hooghly estuary located in the Bay of Bengal, East coast of India was investigated by comparison with ENVISAT satellite measurement. Based on this study, it could be ascertained that new friction formulation has potential for wind-wave modeling studies in near-shore and coastal waters.
机译：全面了解海浪气候是在沿海和近岸地区实际应用的必要先决条件。在沿海地区，主要的耗散机制似乎是底部摩擦，其相对强度取决于底部特征，沉积物类型和底部波纹几何形状。当前的最新版本的SWAN波模型由于底部相互作用而使用三种流行的耗散机制公式。如在SWAN中那样，底部摩擦系数不能为常数，并且在应用于潮汐优势区域时，需要根据主要水动力条件进行调整。波浪-水流相互作用的综合研究应考虑水位的变化，水流系统的逆转以及海床的相关剪切力。本工作报告了在波浪和水流的共同作用下，新的底部摩擦阻力定律的发展。该新公式已在SWAN模型中实现，并且与ENVISAT卫星测量结果进行了比较，进一步研究了其对印度东海岸孟加拉湾Hooghly河口的重要波高变化的影响。根据这项研究，可以确定新的摩擦公式对于在近岸和沿海水域进行风波建模研究具有潜力。

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