基于冲淤面积法的莱州湾东岸典型岸段地貌冲淤演变定量研究

Quantitative Study on Landform Evolution of Typical Coast in the East of Laizhou Bay based on the Corresponding Change of Area Method

本文选取莱州湾东岸地貌冲淤演变较为典型的界河口-石虎嘴岸段为研究对象,在海图、地形图和遥感影像等多源信息基础上,利用Arcgis提取6条岸线,采用冲淤面积法对不同时期的地貌演变进行定量分析。研究结果表明:近50年来,界河口-石虎嘴岸段以蚀退为主,伴有部分淤进。蚀退面积为13.2×10~5m^2,时间集中在1959-1969年、1984-1998年,其中界河口附近蚀退尤为严重;淤进面积为9.5×10~5m^2,时间集中在在1959-1969年、1998-2006年,其中石虎嘴岬角附近淤进最为剧烈。进一步分析表明,10年尺度上,界河口-石虎嘴在海岸工程、水库拦沙和水产养殖等人类活动的影响下,发生了5次岸线蚀退和淤进的交替。

This paper selects the typical coast(Jiehekou-Shihuzui) in the east of Laizhou Bay as the research object. Based on multi×source information such as nautical charts, topographic maps and remote sensing images, six shorelines are extracted using ArcGis software. Then the corresponding change of area method is used on the quantitative study on landform evolution. The result shows that the Jiehekou-Shihuzui is mainly eroded and partly silted over recent 50 years. The erosion area is 13.2×10~5m^2 and mainly occurred in 1959-1969 and 1984-1998. The most severe erosion is near the Jiehekou. The silting area is 9.5×10~5m^2, concentrated in 1959-1969 and 1984-2006. The most severe silting is near the Shihuzui. Further analysis shows that there are 5 alternation of erosion and siltation, under the influence of human activities such as coastal engineering, sediment trapping by reservoirs and aquaculture, in the Jiehekou-Shihuzui area on 10-year scale.