胶州湾冲淤灾害地质及环境稳定性分析

通过对胶州湾1936～2002年4期海图的地形对比和1986年、2007年2期Landsat-5TM影像的对比，分析了近70多年来胶州湾的冲淤灾害地质形势。根据胶卅I湾近百年来的沉积速率特征将其冲淤灾害形势划分为9类，结果表明：胶州湾在1936～1963年间总体呈现轻微淤积态势，但显浪-红岛连线以东区域（含沧口水道）以...

The environmental stability and the hazardous geology in seabed erosion and deposition of Jiaozhou bay

Based upon the comparisons between underwater bathymetries digitized from nautical charts (1936-2002) and between coastlines derived from two landsat-5 TM images (1986-2007), the hazardous geology associated with erosion and deposition was analyzed for the past 70 years. During the last century, the sedimentary pattern was divided into nine types according to the depositional rates. The results show that the slight sedimentation happened as a whole in Jiaozhou bay from 1936 to 1963, while the slight erosion appeared in the eastern embayment (including Cangkou channel). Unlike before, the deposition obviously decreased from 1963 to 1982 and then the sedimentary environment transferred into the equilibrium. Besides, the strong sedimentation was dominant in Cangkou channel during this period. However, the Daguhe and Daoerhe channels were slightly eroded. Subsequently, most of coasts extended obviously towards the sea between 1986 and 2007; the average coastline extending rate was 10¹~10² m yr^-1 and the slight erosion was observed on the seabed. Moreover, the analysis of tidal prism and cross-sectional area of tidal inlets shows that the current velocity amplitude and the corresponding equ-coefficient of friction had decreased over the past 70 years in Jiaozhou bay. This indicates that the entrance of Jiaozhou bay tended to be relatively instable.