工程地质学报2017，Vol.25Issue(6)：1491-1500,10.DOI:10.13544/j.cnki.jeg.2017.06.012
强震区侵蚀-溃决型泥石流的动力特性定量分析
QUANTITATIVE ANALYSIS OF DYNAMIC FEATURES FOR ENTRAINMENT-OUTBURST-INDUCED CATASTROPHIC DEBRIS FLOWS IN WENCHUAN EARTHQUAKE AREA
摘要
Abstract
Many causative factors have changed acutely after the Wenchuan earthquake.They included the loose material,micro-topography and hydrological environment.Hence,the earthquake-induced debris flows are different from the general one.A whole debris flow process mechanism is developed and analyzed quantitatively using initiation discrimination model,bed-matrix erosion model and outburst-discharge enlargement model.It includes the initiation,transition and deposition phases.Moreover,the failure mechanism of the erosion-outburst-induced debris flow is illustrated clearly with an example.The result indicates that bed-matrix entrainment mechanism is the comprehensive outcome of the stress enlargement,strength degradation and material basis.The landslide dam outburst-induced discharge enlargement and the above-mentioned erosion mechanism are contributed to the large-scale debris flow.The case study of Hongchun catchment indicates that debris-flow discharge increases to 800.80m3·s-1 due to H02-03 landslide-dam outburst,and the entrainment-induced solid materials are half of the total magnitude,about 34.72× 104m3.关键词
汶川地震/泥石流/沟床侵蚀/溃决放大效应/FLO-2DKey words
Wenchuan earthquake/Debris flow/Entrainment mechanism/Outburst-enlargement effect/FLO-2D分类
天文与地球科学引用本文复制引用
黄勋,唐川..强震区侵蚀-溃决型泥石流的动力特性定量分析[J].工程地质学报,2017,25(6):1491-1500,10.基金项目
科技部科技基础性工作专项项目(2011FY110100-3),国家科技支撑计划项目(2011BAK12B01),重庆市社会民生科技创新专项项目(cstc2016shmszx30021)资助. （2011FY110100-3）
