Page - 714 - in Book of Full Papers - Symposium Hydro Engineering

DAM SAFETY MONITORING IN EXTREMELY CONDITIONS S.J. WANG1,2, Y.X. WU1,2, Q.PANG1,2, Y.C.GU1,2, 1. Nanjing Hydraulic Research Institute 2. Dam Safety Management Center of the Ministry of Water Resources CHINA 1. INTRODUCTION With global climate change, extreme events such as floods，rainstorm， typhoon，earthquake are frequent nowadays. Ten floods occurred in Yangtze, Huanghe, Huaihe, Zhujiang, Songhuajiang Rivers and 20 sub-rivers encountered extra-history floods in 2017. There are 27 typhoons in western pacific and 8 numbers landing on China in 2017. There are 8 times of earthquake extra 7 magnitude in the world and 19 times of earthquake extra 5 magnitude in China. The above extreme events may lead dam incidents or even failure. More than 2000 reservoir dams were damaged following the Wenchuan earthquake of magnitude scale 8 in May 12, 2008. More than 3000 dams breached since 1954 in China. Overtopping, abnormal seepage, structural instability and earthquake are common dam accidents and major unexpected events. 2. EMERGEMCY MONOTROING Dam safety monitoring following the unexpected events and accidents is essential for emergency action, which prevent or mitigate hazard, emergency inspection, monitoring techniques for the above extreme events and probable accident are studied below. 714