Abstract:

Based on American landsat ETM remote sensing data and so on, this paper constructed remote sensing demonstration system of 3D visualization based on Skyline digital earth model. Based on ERDAS, ARCGIS, MAPGIS and so on software platforms, it extracted remote sensing information of landscape and city expansion in the Yangtze River basin, regarding the environmental science and the theory of sustainable development as guidance, and combining with the basin flood disaster and the longterm goal of social economic sustainable development, this paper proposed the new ideas and countermeasures of land development and flood control under the condition of geomorphologic constraint in the Yangtze River basin. The results show that adopting the remote sensing three level classification of causecause formationphysical formation, and mastered the main landform types, structure and distribution characteristics of the Yangtze River basin; The basic landform units were fenced and the total number was 16 770; The landform was dominated by the mountainous region, hills and plateau types, in which the area of plain accounting a small share about 3.6×105km2; The geomorphic units of block, zonality and directional arrange with outstanding character, its material composition was complex and variable, so it was the important constraint factor of land development and protection; This paper found that there was a 36km long valley terrain latitudinally between Futou Lake of Jiayu city and Wang Lake of Yangxin County in Hubei through the remote sensing stereo system; So, we would accommodate this valley, constructing the large floodway between Futou Lake and Wang Lake through the Yangtze River; Its full length would be 139 km, and it would be 152 km shorter than the 291 km around Wuhan Yangtze River bend at present; So, this paper put forward a proposal which was along the hills and crossing over the down land, carving much more slots, building wall cautiously, keeping away the floodway and no migration, making a requisition of land and compensation in equilibrium and settling down in the neighborhood, land regulation and ecological agriculture depending on each other, considering the irrigation, shipping and tourism synthetically; Through the construction of the Yangtze River floodway and implementation of small and miniature store water project, it could realize the ultimate goal of flood radical solution, and its social, economic and ecological significance would be inestimable; The red layer which is suitable for water and dry farming , the karst basin and granite hilly landform with the weathered eluvium distributed widely, and agricultural development potential was great, so the land bottleneck problem of city construction in the Yangtze River economic belt would not exist in the future