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笔架山连岛沙坝侵蚀和修复的物理模型实验研究

ISSN号：1000-4874
期刊名称：水动力学研究与进展A辑
时间：2014.1.30
页码：50-58
分类：TV148[水利工程—水力学及河流动力学]
作者机构：[1]大连理工大学海岸和近海工程国家重点实验室,大连116024, [2]大连理工大学土木建筑设计研究院,大连116024
相关基金：国家自然科学基金项目（51221961）和海洋公益性行业科研专项基金（201405025）
相关项目：海洋环境灾害作用与结构安全防护

关键词：连岛沙坝, 物理模型实验, 侵蚀, 潜堤, tombolo, physical model test, erosion, submerged breakwater

中文摘要：

该文对笔架山连岛沙坝形成的原因及现状进行了分析，并通过整体物理模型实验研究了造成连岛沙坝侵蚀的原因。在无法恢复水动力平衡的前提下，修复连岛沙坝并使其保持稳定的根本措施是降低东侧的水动力条件对其的侵蚀作用，因此选用潜堤作为连岛沙坝修复后的消浪措施，并通过物理模型实验验证了潜堤的消浪效果。研究结果表明：当双向交替的波动力变成单向动力场后，连岛沙坝的平衡状态即被打破，在波浪与潮流的共同作用下使连岛沙坝受到了严重的侵蚀，但修建潜堤后，潜堤会有效的消减波浪对连岛沙坝的侵蚀作用。

英文摘要：

This paper reviews the reason for the formation of Bijia-mount island gravel tombolo and analyzes its current status. The reasons for the erosion of tombolo are studied by integral physical model test. Under the condition of not being able to restore the hydrodynamic balance, the fundamental measure of restoring tombolo and keeping it stable is to reduce the erosion of hydrodynamic conditions on the east. The submerged breakwater is chosen as measure for wave reduction and the wave redu- ction effect of submerged breakwater is verified by physical model test too. The study shows that the balanced dynamic state of the tombolo is broken when bidirectional alternate waves change into unidirectional dynamic field. The tombolo is seriously eroded by joint action of wave and current; but after the construction of submerged breakwater, it can effectively reduce the erosion on tombolo by the waves.