【摘要】 大山沟位于5.12汶川地震的严重影响区,为了研究地震对其影响,通过详细的野外调查和勘查,对泥石流影响因素、形成机制和动力特征进行了探讨.大山沟是典型的暴雨型泥石流沟,三区明显,具备发生泥石流的三大条件;选择合理经验公式计算大山沟泥石流的重度、流量、流速、一次泥石流过流总量及一次泥石流固体物质冲出量等主要特征值;该泥石流沟在多重因素的综合影响下,进入了灾害活跃期,对泥石流的发生机制进行了系统研究.更多还原

【Abstract】 DA Shan Gull is located in Sichuan Province,which is one of the seriously affected counties during 5.12 Earthquake.In order to study the earthquake’s influence on debris flow gullies in affected areas during 5.12 Earthquake,we studied the characteristics and development trends of debris f low in the Gully based on detailed field survey and investigation.DA Shan Gully is a typical rainstorm debris flow gully.This paper selected reasonable scientific empirical formula to determine the main dynamic eigenvalue,such as severe,flow,flow rate and so on.In the combined effects of multiple factors,DA Shan Gully entered the active phase of debris flow disaster; the number will continue to increase; the frequency and the scale increase ceaselessly.The paper analyzes the occurrence mechanism of the Gully debris flow.更多还原