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

The measured data of beach profiles were obtained from the beach of the Laizhou-Sanshan in 2013. 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 0.5-1 m in the near-shore area, and the sea area beyond 7m of isobath was in a depositional state and the deposits were over 0.5 m in thickness. It is concluded that human activities are the basic factor to cause the changes in scouring and silting pattern.