基于地貌指数的汶川地震灾区单沟泥石流总量计算方法
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摘要
现行的泥石流总量计算方法普遍存在计算参数较难获取或难以精确获取的问题,加上汶川地震灾区沟谷内分布大量的由崩塌、滑坡体等形成的固体松散物质;所以多数泥石流总量计算公式在汶川震区存在局限性。参考适用于以崩塌、滑坡体为主要物源的泥石流总量计算公式;分析研究区范围内地形地貌发育状态与降雨因素及其地质条件之间的影响关系;将地貌指数(Strahler积分)应用于泥石流总量计算,尝试解决缺乏降雨数据情况下泥石流总量计算问题。根据"8.13"四川清平群发性泥石流数据初步回归分析得到适合于汶川震区的泥石流总量计算模型。
Most available equations for estimating a maximum debris-flow volume have the limitation in requiring uncertain input parameters.In addition,landslips and landslides that occurred in the debris-flow source area of the Wenchuan earthquake zone contributed extensively to the debris-flow volume.Most equations have the limitation in this area.This study is based on an equation that is fit for debris-flow in earthquake zone.The relationships among morphometric condition,rain and other geological conditions are analyzed.The morphometric index(Strahler Integration) is tentatively used to calculate debris-flow volume when rain condition data are unavailable.A model suitable for calculation of debris-flow volume of Wenchuan earthquake zone is worked out based on regression analysis of the data of group debris-flows in Qingping Town,Mianyuan River Upstream,Sichuan.
Most available equations for estimating a maximum debris-flow volume have the limitation in requiring uncertain input parameters.In addition,landslips and landslides that occurred in the debris-flow source area of the Wenchuan earthquake zone contributed extensively to the debris-flow volume.Most equations have the limitation in this area.This study is based on an equation that is fit for debris-flow in earthquake zone.The relationships among morphometric condition,rain and other geological conditions are analyzed.The morphometric index(Strahler Integration) is tentatively used to calculate debris-flow volume when rain condition data are unavailable.A model suitable for calculation of debris-flow volume of Wenchuan earthquake zone is worked out based on regression analysis of the data of group debris-flows in Qingping Town,Mianyuan River Upstream,Sichuan.
引文
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[4]庄建奇,崔鹏,葛永刚,等.“5.12”地震后都汶公路沿线泥石流沟危险性评价[J].四川大学学报:工程科学版,2009,41(3):131-139.
[5]崔鹏,韦方强,陈晓清,等.汶川地震次生山地灾害及其减灾对策[J].中国科学院院刊,2008,23(4):317-323.
[6]谢洪,钟敦伦,矫震,等.2008年汶川地震灾区的泥石流[J].山地学报,2009,27(4):501-509.
[7]崔鹏,韦方强,何思明,等.“5.12”汶川地震诱发的山地灾害及其减灾措施[J].山地学报,208,26(3):280-282.
[8]艾南山.侵蚀流域系统的信息熵[J].水土保持学报,1987,1(2):1-8.
[9]艾南山,岳天祥.再论侵蚀流域系统的信息熵[J].水土保持学报,1988,2(4):1-9.
[10]苏鹏程,韦方强,冯汉中,等.“8.13”四川清平群发性泥石流灾害成因及其影响[J].山地学报,2011,29(3):337-347.
[2]Gartner J E,Cannon S H,Santi P M,et al.Empirical models topredict the volumes of debris flows generated by recently burnedbasins in the western U.S.[J].Geomorphology,2008,96:339-354.
[3]Cannon S H,Gartner,J E,Rupert M G,et al.Predicting theprobability and volume of postwildfire debris flows in the inter-mountain western United States[J].Geological Society of Ameri-ca Bulletin,2010,122(1/2):127-144.
[4]庄建奇,崔鹏,葛永刚,等.“5.12”地震后都汶公路沿线泥石流沟危险性评价[J].四川大学学报:工程科学版,2009,41(3):131-139.
[5]崔鹏,韦方强,陈晓清,等.汶川地震次生山地灾害及其减灾对策[J].中国科学院院刊,2008,23(4):317-323.
[6]谢洪,钟敦伦,矫震,等.2008年汶川地震灾区的泥石流[J].山地学报,2009,27(4):501-509.
[7]崔鹏,韦方强,何思明,等.“5.12”汶川地震诱发的山地灾害及其减灾措施[J].山地学报,208,26(3):280-282.
[8]艾南山.侵蚀流域系统的信息熵[J].水土保持学报,1987,1(2):1-8.
[9]艾南山,岳天祥.再论侵蚀流域系统的信息熵[J].水土保持学报,1988,2(4):1-9.
[10]苏鹏程,韦方强,冯汉中,等.“8.13”四川清平群发性泥石流灾害成因及其影响[J].山地学报,2011,29(3):337-347.
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