地震次生山地灾害对岷江干流都江堰-汶川段水电工程的影响

Impact of Mountain Hazards Induced by Wenchuan Earthquake on the Hydropower Projects Along Dujiangyan-Wenchuan Highway

"5.12"汶川地震震级强、烈度大、波及面广、成灾重,震后诱发了大量的次生山地灾害,对山区城镇村庄、道路交通、水利水电工程和通讯基础设施等造成严重破坏。以都汶公路沿线为例,利用实地调查与遥感解译相结合的方法,研究地震诱发次生山地灾害的分布规律,通过对岷江上游重大水电工程的震害损失调查,分析崩塌滑坡、泥石流对水电工程度危害方式;在此基础上对沿线的37条泥石流沟进行危险度评价,其中属于高度危险的泥石流16条,中度危险的泥石流18条,这些泥石流造成严重的堵河危害;最后对水电工程恢复重建提出减灾措施。

Wenchuan Earthquake,which occurred on May 12,2008 in Sichuan Province of China,has the characteristic of high earthquake magnitude,great intensity,wide area and serious disaster.The secondary mountain hazards caused heavy casualties,serious property damage,and the emergency rescue system of roads and transportation blocked.Xuankou-Wenchuan section of Dujiangyan-Wenchuan highway was selected to discuss the distribution of mountain hazards induced by ＂5·12＂ Wenchuan Earthquake.The different types and distribution rules of mountain hazards were extracted and analyzed by means of remote sensing technology and field observation.According to the survey of earthquake losses of hydropower projects in the minjiang river,the hazards pattern of landslide and debris flow to hydropower projects was analyzed.The thirty-seven debris flow gullies along Minjiang River threaten the safety of the highway and bridges cross the gullies.The debris flow hazards assessment results showed that 16 were of high hazardousness,which would result in blocking of the main channel that possibly brought about flood in the downstream of the rive.In the end,the reduction countermeasures were given.