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2010年7月6日,湟源县城南4乡遭遇百年不遇山洪泥石流,造成人民生命和财产的重大损失。为寻求防灾减灾的办法,水保部门进行了灾情调查。调查结果显示,波航沟和寺寨沟两条小流域面积相差不大,自然条件相近,在相同的暴雨条件和相似的经营方式下,形成的山洪泥石流的规模和造成的危害程度却迥然不同,前者轻微,后者严重。分析认为:波航沟流域自然植被、水土保持综合治理程度都优于寺寨沟流域,人为扰动自然的程度低于寺寨沟流域,即波航沟流域水土流失程度比寺寨沟流域轻,是其受灾较轻的主要原因。因此,狠抓小流域水土保持综合治理,是防治山洪泥石流的根本措施,是减灾防灾最有效的途径。
On July 6, 2010, the south 4 townships in Huangyuan County suffered a series of flash floods and debris flows, causing heavy losses to people’s life and property. In order to seek ways of disaster prevention and reduction, the water protection department conducted a disaster investigation. The survey results show that the area of two small watersheds at Bohangao and Sizhaigou is similar and their natural conditions are similar. Under the same conditions of rainstorm and similar management, the scale of the flash floods and the degree of damage caused by them are very different The former is mild and the latter is serious. The analysis shows that the degree of natural vegetation and water and soil conservation in Bohanghangou watershed is better than that of Si Zhaigou basin, and the degree of man-made disturbances is lower than that of Si Zhaigou watershed. That is, the degree of soil and water loss in Bohanghangou watershed is lighter than that of Si Zhaigou watershed, The main reason for its less affected. Therefore, paying close attention to comprehensive management of soil and water conservation in small watershed is the fundamental measure to prevent and control flash floods and debris flows, and is the most effective way to mitigate and reduce disaster.