汶川地震对龙门山地区平通河河流系统沉积物输移的影响

通过对龙门山地区2008年9月和2010年8月发生的大规模的滑坡和泥石流地质灾害的实地考察，并在详细分析龙门山北段平通河地震前后输沙率变化情况的基础上，对龙门山地区2008年汶川地震驱动的地质灾害空间分布情况、龙门山地区地形地貌特征和龙门山地区降水空间分布情况作对比分析，获得以下认识：①汶川地震对该区地质灾害的影响将是持续的，震后地质灾害形成的松散物源将以河流为载体，被输送到下游，并对下游水利建设、防洪防涝等产生较大影响；②构造因素（汶川地震）和地形地貌因素为地质灾害发生的根本原因，气候（降水量和降水强度）则为直接诱发因素。

Effects of Wenchuan Earthquake on Sediments Transport of River Systems in Longmen Shan Area

Based on the field research on the massive landslide and debris flow happened in September 2008 and August 2010 in Longmen Shan area, and analyzing the change of sediment transport rate before and after the earthquake in Pingtong river in the north Longmen Shan, comparing the spatial distribution of geological hazards triggered by Wenchuan earthquake in 2008, the topography of Longmen Shan, and the spatial distribution of precipitation, the following conclusions are gotten: ①Wenchuan earthquake will have a sustained impact on the geological hazards in the region. After earthquake, the loose deposits will be transported to downstream in the river system, and will have a substantial impact on the water conservancy and the control of flood and water logging in downstream. ②Structural factor(Wenchuan earthquake) and the topography are the main cause of the geological hazards, and the climate(precipitation and rain intensity) is the direct inducing factor.