Morphological and Hydrological Effects of Wenchuan Earthquake on Modern Rivers
XU Ling1,DAI Fu-chu1,TU Xin-bin1,WANG Ming-ming2(1.Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;2 .Institute of Geology,China Seismological Administration,Beijing 100029,China)
The Ms 8.0 Wenchuan earthquake strongly shocked at 14:28 on May 12,2008.The seismogenic structure belongs to the Longmenshan fault zone.Its surface rupture belts include those formed along the NE striking Yingxiu-Beichuan and Pengxian-Guanxian faults and the NW striking Xiaoyudong fault.The surface ruptures are characterized by thrust faulting with strike-slip movement.The surface ruptures,landslides,fall and dammed lakes were surveyed with great efforts after the Wenchuan earthquake.However,the morphological effects of Wenchuan earthquake on rivers were not analyzed or discussed.Based on our field survey on earthquake geomorphology,this paper summarizes the morphological effects of Wenchuan Earthquake on rivers including waterfalls by consistent direction fault scarps,river slipping,earthquake fault lakes/poodles and riverway changing.Their developing trends are discussed.The hydrological effects of Wenchuan Earthquake on rivers are also analyzed. The Wenchuan earthquake increased the river silt and sediment contents and changed the river water quality.Furthermore,it heightened the connections between rivers and the groundwater systems.
【CateGory Index】： P315.71