莱州三山岛—刁龙嘴近岸海域冲淤特征

STUDY OF SCOURING-SILTING PATTERN IN THE NEARSHORE AREA FROM SANSHAN ISLAND TO DIAOLONGZUI

以2013年莱州三山岛黄金海岸海滩剖面等实测资料为基础,结合海图和遥感影像等历史资料,利用数值模拟、泥沙起动流速计算和沿岸输沙计算等方法对研究区的冲淤特征进行了研究,并在此基础上初步探讨了影响冲淤演变的主要因素。结果表明,2009—2012年期间王河口至黄金海岸东端之间岸线保持平衡,黄金海岸岸线全线后退,处于侵蚀状态,黄金海岸西段至刁龙嘴之间岸段由于养殖池建设部分岸线向海推进;1984—2004年期间研究区整体处于侵蚀状态,等深线呈不同程度后退;2004—2013年期间研究区整体呈侵蚀状态,近岸海域侵蚀量在0.5~1m之间,7m等深线以深海域呈微淤积状态,淤积量〉0.5m;人类活动是影响研究区近期冲淤变化的根本因素。

The measured data of beach profiles were obtained from the beach of the Laizhou-Sanshan in2013.At the same time,remote sensing images and sea chart data were collected.Based on the data above and using numerical modeling and the calculation of incipient velocity and longshore transport rate,the scouring vs silting pattern is researched and the influencing factors discussed.The results indicate that in 2009-2012,the coastline between the Wang river and the east of the Golden Coast had remained in balance,but all the coastline of the Golden Coast retreated because of the construction of culture ponds,and the part of coastline at the west of the Gold Coast migrated toward the sea.The whole study area was in an erosion state in 1984-2004 and the isobaths retreated.During 2004-2013,the erosion rate was between 0.5-1min the near-shore area,and the sea area beyond 7mof isobath was in a depositional state and the deposits were over 0.5min thickness.It is concluded that human activities are the basic factor to cause the changes in scouring and silting pattern.