海岛岬湾海滩稳定性分析--以长岛明珠广场海滩和荣成镆铘岛海滩为例

STABILITY ANALYSIS OF HEADLAND BAY BEACH AROUND ISLAND:TAKING MINGZHU SQUARE BEACH OF CHANG ISLAND AND MOYE ISLAND BEACH OF RONGCHENG AS EXAMPLES

海滩是海岛海岸重要的沉积地貌单元,其沉积特征和稳定性对于海滩的进一步开发利用和海滩养护具有重要意义。依据烟台长岛明珠广场海滩(人工沙滩)和威海荣成镆铘岛海滩剖面形态特征,结合表层沉积物粒度特征,分析了海滩剖面的稳定性,同时利用岬湾海滩静态平衡模型(MEPBAY),对两海滩平面形态的稳定性进行了分析和预测。结果表明:明珠广场海滩处于前滨严重侵蚀的不稳定态,镆铘岛海滩处于局部微侵蚀的轻度不稳定态。另外,从海岛海滩地理特征、水动力环境、泥沙来源和人类活动等方面简单归纳了两个海滩的侵蚀原因。

As an important depositional morphological feature along a coast,the beach and its stability are of great significance for development,utilization and nourishment.In this paper,the stability of the Mingzhu Square Beach,an manmade beach around the Chang Island and the Moye Island Beach of Rongcheng are studied based the topographic profiles and grain-size data from beach surface.The parabolic bay model（MEPBAY）is adopted to analyze and predict the stability of the two beaches.Results show that the Mingzhu Square Beach remains in an unstable stage with severe erosion of foreshore,and the Moye Island Beach is in a slightly unstable stage with rather weak erosion.On the basis,we briefly discussed in this paper the reasons that cause erosion from island beach geographical features,hydrodynamic environments,sediment sources and human activities.