摘要
海滩排水管建设对海滩环境影响较大。以厦门会展中心连岛沙坝式排水管头工程影响海滩演变为例,研究连岛沙坝式海滩排水管头对海滩地形稳定性和沉积的影响。1)通过对研究区连岛沙坝式管头附近海滩10条剖面进行分析,研究管头附近海滩滩肩宽度、滩面坡度和单宽留存沙量等剖面形态变化特征。测量数据分析表明,无管头保护滩面高程降低,滩面坡度总体变陡,滩肩蚀退严重;受管头保护滩面高程上升,坡度变缓,滩肩宽度略有减小,剖面单宽沙量留存比例大于1。2)2012-2016年多期岸线及管头边界线变化结果表明,工程施工后,排水管身始终被沙体覆盖,一年后部分管头被沙体覆盖,最终管头被覆盖率稳定在70%以上。3)会展管头附近海滩潮上带和高潮带沉积物自北向南运移,低潮带则相反;潮上带和中潮带上部沉积物从管头所在"连岛沙坝"向两侧海滩输移,而低潮带和中潮带下部输移方向相反。沉积物粒径由岸向海逐渐变粗,越靠近管头,沉积物粒径呈变细趋势。最后讨论了引起管头局部海滩地形地貌变化的主要因素。
Beach drainage construction has significant effects on the beach environment. Taking the example of Xiamen International Convention and Exhibition Center beach, where drain-pipe was designed by the theory of tombolo, the paper focuses on the evolution of the beach morphology： 1） Profile morphological features such as beach bern width, beach slope and unit sand volume of 10 beach profiles were measured at the beach, where drain-pipes were built. The results indicate that without the shelter of drian-pipe tips, the height of the beach surface was reduced, the beach slope became steeper and the beach berm was eroded severely; with the shelter of drain-pipe tips, the elevation of the beach was increased, the slope became gentler, and the unit sand volume became larger than before. 2） Investigations into beach shorelines near drainage tips and the sand coverage area were carried out during years between 2012 and 2016. The result shows that the drainage pipe is always covered by sand, one year later, part of the pipe tip was covered gradually, and finally above 70% of the tips were covered. 3） Near the tips, sediment located in the uppertidal zone and hightidal zone moves from north to south, while the movement in the lowtidal zone is just the opposite. Sediment which covers the tips and is located in the supratidal and upper intertidal zone moves from tips to beach, while the movement is opposite in the low-tide and lower intertidal zone. Sediment tends to be thicker from shore to sea, and closer to the tip, and the finer sediment is found. Finally, this paper gives the main factors which affect the topographic change of the beach.
出处
《海洋工程》
CSCD
北大核心
2018年第1期128-137,共10页
The Ocean Engineering
基金
国家海洋公益性行业科研专项(200905008
201405037)
国家自然科学基金青年科学基金项目(41406070)
关键词
连岛沙坝式管头
海滩演变
稳定性
厦门会展中心
tombolo-shape drainage tips
beach evolution
stability
Xiamen International Convention and Exhibition Center
