新滩海域海岸演变及冲淤变化分析

Analysis of Coastal Evolution and Changes of Erosion and Deposition of Xintan Area

运用1997—2008新滩海域16个剖面的监测资料,分析了新滩海域海岸演变及冲淤变化特点。结果表明:受黄河入海水沙量减少、河口流路分汊影响,新滩海域的边界条件不断发生改变,海洋动力影响相对增强,造成新滩海域整体不断被侵蚀。从剖面形态变化特征来看,孤东岸段S1—S3剖面和新滩中部S7—S10剖面为均衡侵蚀型;老河口附近S11和S12剖面为上冲下淤型。从剖面侵蚀过程来看,除河口附近轻微淤积外,孤东及新滩海域的其他剖面在-10 m以浅大部分表现为冲刷,在孤东海堤附近和清水沟老河口附近的岸段侵蚀尤为严重。

Using the monitoring data of sixteen sections in Xintan area from 1997 to 2008, we analyzed the characteristics of coastal evolution and changes of erosion and deposition in Xintan area. The results show that the reduction of the Yellow River water and sediment into the sea and the flow path branching in intensity, cause the boundary conditions of Xintan area change constantly, marine power increases relatively, and the continuous erosion of the whole Xintan area. According to the variation characteristic of the sections, we find that the sections from S1 to $3 of Gudong beach and the sections from $7 - $10 in the middle part of Xintan area are the type of equilibrium erosion, S11 and S12 profiles near Laohekou are the type of alluvial at upper part and deposition at the lower part. On the basis of the sections erosion process, we know that most other profiles of Gudong and Xintan beach above - 10m are of scouring, in addtion to the beach near the estuary deposits slightly, specially the coast near Gudong beach and Laohekou of Qingshuigou is eroded seriously.