莱州湾南岸海岸侵蚀过程与原因研究

Study on Process and Cause of the Coastal Erosion Along the South Coast of the Laizhou Bay

采用历史资料对比分析的方法，对莱州湾南岸1958-2004年的海岸侵蚀进行了研究。结果表明，1958-1984年，莱州湾南岸岸线平均侵蚀后退速率为27m／a，0m等深线后退速率为27～65m／a，岸滩平均蚀低速率为2．1cm／a。1984-2004年，莱州湾南岸岸线位置基本无变化，岸滩平均蚀低速率为1.04cm／a，水深5m以浅的区域表层沉积物变粗。海面相对上升、入海泥沙量减少和风暴潮是研究区海岸侵蚀主要原因，三者对海岸侵蚀影响权重比为3：5：2。

The comparative analysis method of historical data was used to study the coastal erosion along the south coast of the Laizhou Bay during 1958 to 2004. It is shown from the analysis results that the average retrogradation rate of the south coastline of the Laizhou Bay during 1958 to 2004 was 27 m/a, the average retreating rate of the 0 m isohath was in the range of 27 to 65 m/a, and the average cutting rate of beach face was 2. 1 cm/a. The location of the south coastline of the Laizhou Bay during 1984 to 2004 was basically unvaried, the average cutting rate of beach face was 1.04 m/a, and the surficial sediment in the area with water depth less than 5 m became coarser. The relative rise in sea level, decrease in sediment supply and storm surge are main causes for the coastal erosion in the study area, and the ratio of contributions of the three causes to coastal erosion is 3 ： 5 ： 2.