Page - 948 - in Book of Full Papers - Symposium Hydro Engineering

RESEARCH OF RESERVOIR EMPTYING DESIGN OF HIGH DAMS IN CHINA Liu Chao China renewable energy engineering institute, Beijing 100120, China Zhao Quansheng China renewable energy engineering institute, Beijing 100120, China Zhou Jianping Power Construction Cooperation of China, Ltd, Beijing 100048, China ABSTRACT Emptying facilities of high dams play an important role for overhauling during operation period and lowering water level in case of emergency so as to reduce risk of the whole projects. Based on summarizing of present design status of reservoir emptying, the key technology problems of lower discharge facilities are analyzed firstly. Secondly, this paper puts forward that characteristics of reservoir and projects as well as hydrologic conditions should all be considered when emptying design to help choosing a reasonable emptying scale and depth. At the last, this paper indicates that the basin cascade dispatching and forewarning, manage systems of dams safety adapting to construction and economic level, as well as dams lifecycle safety management and risk distinction system suited to national conditions, should all be established as soon as possible, in order to minimize risk of basin cascading dams failure. KEY WORDS reservoir emptying; lower discharging; underwater overhaul; emergency management; basin cascade PREFACE Till 2017, more than 20 super high dams over 200m have been built or were under construction in China, which play an important role in the national economy development. After reservoirs impounding, it not only bring up benefit of flood controlling, irrigation and generating electricity, etc., but also pose a threat to downstream areas. There's no dam failure of large reservoirs occurred in China since 1980s, stood tests of big flood in 1998 and Wenchuan Earthquake in 2008, Ya'an Earthquake and so on. Especially Zipingpu CFRD of 156m height which is only 17km far from the epicenter of Wenchuan Earthquake and Shapai RCC arch 948