Prevention and Control of Geologic Disasters Occurred in the Sanxia Reservoir Bank Falling Area of the Yangtze River

After completing,the bank of Sanxia Reservoir of the Yangtze River will form a falling area of about 30 m vertical drop due to the seasonal changes of the reservoir regulation.It will cause disorder,falling,moving and creeping of rocks,re-movement of the old landslide body and fallen rocks and the falling area will become a frequently-occurring region of geologic disasters owing to the variation of dynamic action after the reservoir completion.The paper puts forward disaster monitoring means based on the combination of GIS and RS and an engineering system of disaster prevention and control by taking the works of drainage,bank protection,waves prevention,fixing slopes for against sliding and planting trees and grasses as the main based on the study on disaster formation mechanism of geology and geomorphology of the reservoir falling area.