基于DEM及RS的莱州湾东岸王河古河道演变研究

Ancient Channel Evolution of Wanghe River Based on DEM and RS in the East Coast of Laizhou Bay

基于RSDEM3分析、陆地卫星TM图像分析,结合野外实地调查与历史资料分析,获得了莱州湾东岸地形及水系分布.结果表明,来自DEM分析所获得的水系与研究区现在河流一致,但与清代疆域图中描绘的万岁河(王河故道)不一致,DEM分析结果不支持这一王河故道的存在,实地调查也未发现相关的河流改道证据.TM图像特征显示,在河口村至崔家一带至少存在两道古海岸沙堤,构成了古岸线存在的重要证据.河口村向西,经过水南宋家北侧、河套赵家、大沙埠庄一线存在一条古河道,王河泥沙直接提供给莱州浅滩的西侧;改道后直接向北从三山岛西侧入海,泥沙提供给莱州浅滩的东侧.王河河道的历史演变在空间上与海岸带关系极为密切,对三山岛以西的沙咀、海岸线发展、以及近海莱州浅滩的演变有着重要的影响.

Based on RSDEM3 analysis,Landsat TM imagery analysis as well as field survey and historical data analysis,the topography and streamnet distribution in the east coast of Laizhou Bay was obtained.It was shown that the streamnet obtained from the DEM analysis was consistent with the river in the study area,but was inconsistent with Wansui River（the old course of Wang River） depicted in Qing dynasty territory figure,and the results by DEM analysis did not support the existence of the old course of Wanghe river.Fieldwork also did notfind evidence related to river diversions.TM image features revealed that at least of two ancient coastal sandbars existed between Hekou village and Cuijia village,which is a direct evidence of the existence of ancient coast line.Fieldwork and village name showed that there was a ancient river course from the west of Hekou village to the north of Shuinanshongjia village,Hetaozhaojia village,Dashabuzhuang village.The sediment from Wanghe river provided directly to the west of Laizhou shoal during this times,and later,the river rechannelled to enter directly towards north into the sea through the west of Sanshandao island,which lead to the river sediment supplied to the east side of the Laizhou shoal.There is extreme relationship between space and coastal zone about Wanghe river channel evolution,and it has an important impact on the development of the sandspit at the west of Sanshandao island,shoreline,as well as the evolution of Laizhou shoal offshore.