摘要
下沙海滩位于象山县东海岸,长度约为600 m,宽度约40 m,由于早期挖沙严重,加上滩肩建设海堤减少了来沙条件,造成部分沙滩中潮位以下泥滩裸露明显,海滩宽度缩小明显,海滩外侧距岸线100 m外的海床为淤泥质。采用静态岬湾平衡理论和平衡剖面对人工补沙试验进行了平面和剖面设计;并对补沙后海滩的剖面和平面形态等特征参数的演变进行了分析,评估了补沙后的沙质流失率和滩面泥化程度。结果表明,补沙后沙滩的宽度增加明显,剖面坡度基本维持在1:13,滩面表层泥化现象较小。
Xiasha beach is located in the east coast of Xiangshan County,600m in length and 40m in width approximately. Due to the severe dredging in early time and the seawall which was built on the beach berm reduced the sediment transporting conditions,part of the beach whose elevation below the middle tidal level exposed obviously,and the width of the beach was also significantly reduced,the seabed 100m off the shoreline was muddy. The Cape Bay static equilibrium theory and balanced profile theory were used in the flat and profile design of the experiment of beach nourishment ;evolution of beach profile and characteristic parameters of plane pattern were studied to assess the sande rosion rate and beach surface mudding degree after the experiment. The results showed that after sand nourishment,the increase of the width of the beach was obvious,the slope of the profile was maintained at 1:13,and the degree of muddy phenomenon of the beach surface was small.
作者
姚文伟
黄世昌
刘旭
YAO Wen-wei;HUANG Shi-chang;LIU Xu(Zhejiang Institute of Hydraulics & Estuary,Hangzhou 310020,Zhejiang,China;Zhejiang Institute of Marine Planning and Design,Hangzhou 310020,Zhejiang,China)
出处
《浙江水利科技》
2017年第1期73-76,85,共5页
Zhejiang Hydrotechnics
基金
浙江省科技计划项目(2015F50011)
关键词
补沙
沙滩设计
沙滩演变
泥化
beach nourishment
beach design
beach evolution
muddy
