Prediction of rebuilding of bank slopes for the new site of Wushan Town in Three-Gorge Reservoir Area

The geoenvironmental problems have appeared during the immigrant process of the new town of Wushan County in Three-Gorge Reservoir Area. Some buildings have been built in the area of future rebuilding zones of bank slope. It is necessary to predict the deformation range of bank slopes during the reservoir filling and operating process for city planning and land use. The natural stable slope shape statistics and geological analog method for slopes were applied to predict rebuilding of bank slopes. According to the modal parameters for the modem riverside slope of the Yangtze River, the statistics value of stable slope angles of corrosion and accumulation status in land, water: and changing range of water-table were collected and calculated. The final stable gradients of the reservoir in the changing range of corresponding water level after water stored in the reservoir have been analogized and ascertained. Based on the research of geoenvironment and statistics of modal parameters of the bank slopes, 16 geological profiles of the bank slopes in the west area of the new site is drawn. Then, rebuilding of each part bank slope is predicted, and the final width of deformation of bank slopes is worked out, hereby the borderline and ichnography of rebuilding of bank slopes is drawn. The prediction shows that the final width of rebuilding of bank slopes is 44 similar to 201m after water stored in Three-Gorge Reservoir. The results suggest that is necessary and important to comply with the acclimatization principle in rebuilding area of bank slopes, and the eternal construction must not be placed in. However, based on the research for geoenvironmental factors of ideographic bank slopes, some temporary constructions may be planned and built in terms of the predicted time, speed, and scale of rebuilding of bank slopes. Further more, the deformation area of bank slopes may need to be reinforced in. order to extend the land use area of the new city.