摘要
由于汶川地震灾区泥石流固体物质补给方式和成因的复杂性,很多泥石流流域在产流、汇流和运动阶段都存在导致流量放大的过程,用现有的泥石流峰值流量计算方法得到的结果都偏小。具体的分析表明,震后泥石流的产汇流过程并不是线性等同于清水的产汇流过程,泥石流流量的放大系数与清水峰值流量不是线性正比的关系。通过拟合北川极重灾区苏宝河和魏家沟等流域泥石流沟的现场调查数据,得到了泥石流放大系数与流域清水峰值流量之间的幂函数经验关系。并由此建立了泥石流峰值流量的非线性雨洪修正计算方法。该方法可用于计算震后崩滑体较多的流域的泥石流峰值流量。
Mitigating debris-flow hazards is a great challenge in a period after Wenchuan Earthquake.Because of the complexity of debris supply and formation,the debris-flow discharge with respect to flood discharge was amplified in runoff,converging and moving stages of debris flows,and previous methods of calculating debris-flow peak discharge were not available for the debris-flow ravines in the earthquake-affected region.The investigation of the formation of post-quake debris flows indicated that debris-flow hydrologic process is not linearly equivalent with flood hydrologic one,and debris-flow amplification coefficient is not linearly proportional to flood peak discharge.An empirical relationship of power function between the amplification coefficient and the flood peak discharge was built by analyzing the field data of seven debris-flow ravines in Subaohe,Weijiagou and Dubahe basins of the earthquake region.Combined the classical modified flood discharge method with the empirical formula,a nonlinear flood method was developed for calculating debris-flow peak discharge,which can be applicable to post-earthquake region.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2010年第5期52-57,共6页
Journal of Sichuan University (Engineering Science Edition)
基金
国家重点基础研究发展计划资助项目(2008CB425802)
中国科学院知识创新工程重要方向项目群(KZCX2-YW-Q03-5)
国家自然科学青年科学基金项目(40701014)
关键词
汶川地震
泥石流
流量计算
雨洪修正法
Wenchuan Earthquake
debris flow
discharge calculation
modified flood discharge method
