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Predicting Volume and Runout of Single Gully Debris-Flow Using Hypsometric Integral Value in the Wenchuan Earthquake Area
Zhang, Huaizhen1,2,3,4; Fan, Jianrong1,2; Liu, Qing1,2,4
Corresponding AuthorFan, Jianrong
Source PublicationProceedings of the International Symposium on Earthquake-Induced Landslides ; Earthquake-Induced Landslides
Conference Date2012
Conference PlaceJapan
Funding OrganizationThe Japan Landslide Society (JLS)

Debris-flow volume and runout zone are estimated from empirical equations which are based on the most important morphometric characteristics of a catchment and have the limitation of requiring uncertain input parameters. In addition, due to extraordinary abundant loose solid materials and local short-time heavy rainfall by extreme climate in the Wenchuan earthquake area, large errors will occur if the existing empirical equations
are directly used. In order to enhance the applicability of those empirical equations in this area, we use Strahler’s Hypsometric (area-altitude) analysis method to quantitatively describe the geomorphological conditions, develop models that quantitatively depict spatial distribution of mainly available loose sediment in debris-flow catchment and with integral values T, G1 and G2 as quantitative parameters of loose sediment’s spatial
conditions. Grouping-occurring debris-flows triggered by the September 24, 2008 rainstorm in Beichuan County and the August 13, 2010 regional rainstorm in Qingping Town, Mianzhu County are selected. Applying multivariate regression analysis, Hypsometric integral value S is used in estimating debris-flow volume and runout distance models; and T, G1 and G2 are used as the coefficients of correction. The results showed that the hypsometric integral value S was suitable for the prediction of the debrisflow volume and runout zones in the Wenchuan earthquake area; the predicted results were more accurate when T, G1 and G2 are used. The introduction of S, T, G1 and G2 will enhance the applicability of existing empirical equations in Wenchuan earthquake area.

KeywordDebris-flow Runout Zone Wenchuan Earthquake Hypsometric Integral Spatial Parameter
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Document Type会议论文
Affiliation1.Key Laboratory of Mountain Hazards and Surface ProcessChinese Academy of Sciences
2.Institute of Mountain Hazards and EnvironmentChinese Academy of Sciences and Ministry of Water ConservancyChengduChina
3.Institute of Remote Sensing ApplicationsChinese Academy of SciencesBeijingChina
4.Graduate University of the Chinese Academy of SciencesBeijingChina
Recommended Citation
GB/T 7714
Zhang, Huaizhen,Fan, Jianrong,Liu, Qing. Predicting Volume and Runout of Single Gully Debris-Flow Using Hypsometric Integral Value in the Wenchuan Earthquake Area[C],2013:301-311.
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