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首页> 外文会议>Second International Conference on Estuaries and Coasts vol.1; 第二届河口海岸国际研讨会论文集 >PHYSICAL MODEL STUDY OF SHOAL-SCOURING POOL-SEDIMENTATION IN THE CHANNEL-RIDGE SYSTEM OF THE RADIATE SAND RIDGES IN SOUTH YELLOW SEA
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PHYSICAL MODEL STUDY OF SHOAL-SCOURING POOL-SEDIMENTATION IN THE CHANNEL-RIDGE SYSTEM OF THE RADIATE SAND RIDGES IN SOUTH YELLOW SEA

机译：南黄海放射状河谷渠道-河脊系统浅滩冲淤的物理模型研究

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摘要

Based upon the 1963-2005 bathymetry data in the Xitaiyangsha area in the mid-southern part of the radiant sand ridges in combination with analysis on tidal, wave characteristics and sediment properties, the paper explores the mechanisms responsible for long-term evolution of the Xitaiyangsha channel-ridge system under tidal dynamics and the accidental occurrences of shoal scouring and pool sedimentation by big waves. The present study conducted physical model experiments that successfully replayed the interactions of wave with tide in the area of the radiant sand ridges and modeled the process of shoal scouring and pool sedimentation by the "Matsa" typhoon. Through seven different-return-period experiments on sediment activities under the co-action of wave and tide, the characteristics and evolution pattern of the shoal scouring and deep-pool sedimentation in different wave conditions are analyzed. It is concluded that the shoal scouring and pool sedimentation occur mainly in waters where ridge and channel distribute alternatively; high-tide big waves and low-tide breaking waves could cause the strongest scouring of the shallow-water bank slopes; the local sediment transport from bank slope to deep pool in a stationary-wave tidal environment constitutes the responding processes of shoal-scouring & pool-sedimentation; with the topographic change, the scouring-sedimentation magnitude by consecutive big waves with different return periods in one experiment is far less than that accumulated by single-big-wave with the same return period experiments.
机译：本文基于辐射沙脊中南部中部西太洋沙地区的1963-2005年测深资料，结合潮汐，波浪特征和沉积物特性分析，探讨了造成西太洋沙长期演化的机理。潮汐动力作用下的河道-脊索系统以及大浪冲刷浅滩冲刷和水池沉降的偶然事件。本研究进行了物理模型实验，成功地重现了辐射性沙脊地区波浪与潮汐的相互作用，并通过“ Matsa”台风模拟了浅滩冲刷和水池沉积的过程。通过潮汐作用下泥沙活动的七个不同回潮期实验，分析了不同波浪条件下浅滩冲刷和深池泥沙淤积的特征和演化规律。得出的结论是，滩涂冲刷和池沉积主要发生在脊​​和河道交替分布的水中。高潮大浪和低潮大浪可能引起浅水岸坡最强烈的冲刷；平稳波潮环境下，从岸坡到深水库的局部泥沙运移构成了浅滩冲刷和池沉的响应过程。随着地形的变化，在一个实验中，连续两次不同返回周期的大浪冲刷的沉降幅度远小于在同一返回周期实验中单个大浪冲刷的沉降幅度。

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