芝罘岛北岸海湾砾滩侵蚀研究

THE EROSION OF GRAVEL BEACHES IN NORTHERN COAST OF ZHIFU ISLAND

对位于芝罘岛北岸婆婆口东侧海湾潮间带砾滩进行了研究,通过2004年5月和2007年5月2次野外调查结果分析,获得了2次采样时砾滩的特征及其空间的变化特征。调查统计表明,2004年5月的砾滩属于正常的砾滩,砾滩的结构较完整,发育2道滩脊;2007年5月的砾滩不完整,部分滩面基岩裸露。海滩砾石的形态特征统计,能反映海滩横剖面与纵剖面的变化。平均粒径38mm的等值线,在砾滩上呈现出随时间变化而向海的方向推移。由于砾石在3年中的磨损有限,砾石特征参数的空间变化主要是由于海洋异常动力变化,而促使砾石的组成及结构发生急剧调整的结果。海滩砾石调整事件可能与2007年3月的特大风暴潮有关。

The tideland gravel in the east of Popokou where in the northern coast of Zhifu Island is studied in this paper. The character of gravel beaches and it＇s changes in space were obtained by surveying and analysis in May, 2004, and in May, 2007. The surveys and statistic indicate that the gravel beaches in May, 2005, is natural, and the constitute is integrated. There are two strip ridges in the gravel beaches. But the gravel beaches are abnormal, and not integrated in May, 2007. There is some bedrock comes out on the beaches. The isoline of 38mm in grain size was gained by the statistic character of gravel beaches, the result showed that the isoline moved towards the sea with time. The change of average diameter in space is due to motivity of abnormal ocean that makes the gravel to adjust rapidly. It relates to the huge storm tide in March, 2007.