辽宁省海岸带主要河口区近百年沉积速率变化规律

VARIATION OF DEPOSITION RATE OF THE MAJOR COASTAL ESTUARIES IN LIAONING PROVINCE DURING THE LAST CENTURY

基于^(137)Cs法和^(210)Pb法的相互校验,利用13孔岩心663个样品,定量分析了辽宁省海岸带主要河口区近百年沉积速率变化规律.研究表明,辽宁海岸带不同地区、不同时间段沉积速率是不同的.辽河河口区沉积最快,为23.66 mm/a,属于中高速沉积区;辽西海岸带沉积最慢,且总的趋势是沉积速率逐渐减小.随深度增加,辽西海岸带沉积速率逐渐加大,辽东湾大辽河、大凌河入海口沉积速率出现多个峰值,辽东半岛黄海西北岸沉积速率则逐渐减少.

Based on testing and checking by 137Cs method and 210pb method, this paper quantitatively analyses 663 core samples from 13 drill holes to study the deposition rate changes in the main coastal estuaries in Liaoning Province over a hundred years. The result shows that the deposition rates vary in different areas and times. The deposition rate of estuary of Liaohe River is the largest （23.66 mm/a）, belonging to medium-high rate deposition. The slowest rate is in the western Liaoning coastline, with gradually reducing trend. The deposition rate in the western Liaoning coast increases with depth. In Liaohe River of the Liaodong Bay and the estuary of Daling River, the deposition rate shows multi-peak. While in the Liaodong Peninsula on the northwestern shore of the Yellow Sea, the deposition rate reduces with depth.