【摘要】 采用了岷江上游15个水文站的多年径流资料及降雨资料,探析了岷江上游降水量-径流量的相关关系,分析了该流域洪水的变化趋势,在此基础上,分析了该流域2010年"8.13"、"8.18"洪水的发育情况与汶川地震对洪水发育的影响。研究结果表明,汶川地震后,岷江上游震后山洪特征表现为:①岷江上游属于汶川地震带,为该区山洪发育提供了基本条件;②震后植被覆盖率降低是洪水加剧的重要条件;③震后强降水是特大山洪发育的诱发因素;④地震滑坡淤堵河道后溃决,加剧了洪水的突发性、破坏性;⑤震后该流域洪水发生的临界雨量明显降低,洪水量和频率将加大。更多还原

【Abstract】 After "5.12" Wenchuan earthquake hit the upper reaches zone of Minjiang river,consecutive "8.13","8.18" heavy rainstorm attacked these areas in 2010,which triggered severe post-earthquake flash flood disaster in the earthquake zone.Based on runoff and rainfall data of 15 hydrological stations in the upper reaches zone of the Minjiang river,the rainfall-runoff correlation is analyzed,the flash flood change trend is explored,the formation of "8.13","8.18" flash flood in 2010 and effect of earthquake on the flash flood is researched.Research results show that,after the Wenchuan earthquake,post-earthquake flash flood in upper reaches of Minjiang river is characterized as following:(1) The zone in the upper reaches of Minjiang River belongs to the Wenchuan seismic belt,which provides the essential conditions for the flash flood formation;(2) The reduction of vegetation coverage ratio after the earthquake is the important factor to aggravate the flash flood;(3) Heavy rain is one important factors inducing flash flood;(4) Landslides induced by earthquake block river course and then the dam crevasse,which exacerbated the flash flood emergency and destructivity;(5) The critical rainfall of flash flood occurrence decreased significantly and the flash flood volume and frequency increase after the earthquake.更多还原