Abstract:

Based on the topographic maps of Nandashan,Xinhekou,Guozhenshi,Xinqiang and Taolinsi with a scale of 1:50 000 in 1955 and 1983, digital elevation models in these regions were setup by using Geographic Information System (GIS) tools  to vector contour lines and terrain points.And then the spatial distribution maps of surface vertical deformation were produced by calculating digital elevation models in two periods.Combined with distribution maps of surface vertical deformation,geological data and sediment deposition data,reasons of surface vertical deformation were analyzed.The results were as follows.(1)The subsidence areas were larger than uplift areas in NandashanXinhekou region during 1955-1983.Subsidence areas were mainly affected by the tectonic subsidence,while uplift areas were mainly influenced by sedimentation and human activities in the region.(2) In GuozhenshiXinqiangTaolinsi region,uplift areas were much larger than subsidence areas.Subsidence areas were mainly distributed along waters resulted from flowing water and human activities,and uplift areas were mainly influenced by the uplift of Mufu Mountain in the region.(3) The center of the basin was influenced by tectonic subsidence such as NandashanXinhekou region,most areas gave priority to the subsidence,but local areas were affected by water,sediment deposition and human activities,so that some areas were in serious subsidence,and some areas were uplift.And the edge region of the basin were influenced by tectonic uplift such as GuozhenshiXinqiangTaolinsi region,so most areas gave priority to the uplift,but local areas were affected by the constant flow of water,sediment deposition and human activities,so that some areas were increasedly uplifted,and some areas were kept in the state of subsidence.Therefore，studying the spatial distribution and related reasons of surface vertical deformation in the east of Dongting Basin will play an important role in understanding the evolutionary tendency and planning and construction of industry and agriculture.