CHANNEL CONCENTRATION AND ITS IMPACT ON NEARSHORE WAVE CONDITIONS

Ben Modra
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Abstract

Channel concentration is an important wave process in coastal regions. It occurs when a shallow water wave approaches a deep channel at a shallow angle, producing a localized region of increased wave height at the edge of the channel, and the early onset of wave breaking. Channel concentration can occur at dredge channels, so is of particular significance to port entrances and surrounding infrastructure, especially for breakwater heads. It also occurs at natural features such as submarine canyons, particularly where the canyon is perpendicular to the coastline. In contrast to refraction or channel reflection, channel concentration is not well documented in the available literature. While studies show wave concentration as a significant coastal process, there is insufficient information on the process to provide general design guidance for its consideration in harbour projects. As such, there is still the need to use design tools such as physical modelling to ensure the site specific wave conditions are characterised correctly.
航道集中及其对近岸波况的影响
河道集中是沿海地区重要的波浪过程。当浅水波浪以浅角度接近深水道时,在水道边缘产生局部波高增加区域,并且波浪破碎的早期开始。疏浚通道可能发生河道集中,因此对港口入口及周边基础设施,特别是防波堤头具有特别重要的意义。它也发生在自然特征,如海底峡谷,特别是在峡谷垂直于海岸线。与折射或通道反射相反,通道浓度在现有文献中没有很好的记录。虽然研究显示海浪集中是一个重要的海岸过程,但有关这一过程的资料不足,无法为海港工程提供一般的设计指导。因此,仍然需要使用设计工具,如物理建模,以确保正确地描述现场特定的波浪条件。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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