四川都江堰龙溪河流域泥石流成因、特征和危险性评价
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摘要
在汶川地震影响下,截至2011年龙溪河流域共计有45条泥石流沟暴发泥石流,造成重大经济财产损失.在龙溪河流域泥石流灾害野外调查的基础上,对形成泥石流的地形、降水、物源成因进行了研究,认为物源和降水是激发龙溪河流域泥石流的主要原因.龙溪河流域泥石流具有群发性和小流域暴发性特征,构造带耦合特征,破坏性大和灾害链作用特征.采用MFCAM模型对龙溪河流域泥石流沟进行危险性评价,结果显示有1条沟危险性大,14条危险性中等,30条危险性小.
Under the influence of the Wenchuan Earthquake,debris flows have taken place in a total of 45 gullies in Longxi River Basin by 2011,causing heavy economic and property losses. The landform,precipitation and provenance are studied based on the field investigation of debris flow disasters. It is believed that the latter two are the main causes for debris flows in the area. The debris flows are characterized by group occurrence,small river basin outbreak,structural belt coupling,huge destructiveness and disaster chain. The MFCAM model is used for the hazard assessment of debris flow gullies. The results show that there is one gully with high risk,14 with moderate risk and 30 with low risk in the area.
Under the influence of the Wenchuan Earthquake,debris flows have taken place in a total of 45 gullies in Longxi River Basin by 2011,causing heavy economic and property losses. The landform,precipitation and provenance are studied based on the field investigation of debris flow disasters. It is believed that the latter two are the main causes for debris flows in the area. The debris flows are characterized by group occurrence,small river basin outbreak,structural belt coupling,huge destructiveness and disaster chain. The MFCAM model is used for the hazard assessment of debris flow gullies. The results show that there is one gully with high risk,14 with moderate risk and 30 with low risk in the area.
引文
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[4]程思.都江堰市龙池地区震后多沟同发泥石流危险性及易损性研究[D].成都:成都理工大学,2016.
[5]游勇,柳金峰,陈兴长.“5·12”汶川地震后北川苏保河流域泥石流危害及特征[J].山地学报,2010,28(3):358-366.
[6]张春山,张业成.中国崩塌、滑坡、泥石流灾害危险性评价[J].地质力学学报,2004,10(1):27-32.
[7]刘希林,唐川.泥石流危险性分析[M].北京:科学出版社,1995:35-61.
[8]刘希林.沟谷泥石流危险度计算公式的由来及其应用实例[J].防灾减灾工程学报,2010,30(3):241-245.
[9]刘希林,莫多闻.泥石流风险评价[M].成都:四川科学技术出版社,2003:13-32.
[10]刘清华,余斌,唐川,等.四川省都江堰市龙池地区泥石流危险性评价研究[J].地球科学进展,2012,27(6):670-677.