摘要
容重是描述泥石流性质的重要基础参数。本文基于泥石流运动过程的时空特征,厘定了最大容重、峰值容重和平均容重3个容重特征值。以蒋家沟1987年以来的泥石流观测数据为分析对象,分析了3个容重特征值在数值上的分布规律和影响因素。结果显示:①最大容重与峰值容重的关系式具有较好的相关性,最大容重与平均容重的关系式具有实际计算适宜性;②最大容重和峰值容重均与泥石流峰值流量呈正相关,与泥石流冲出规模关系不明显。在现有泥石流容重计算方法基础上,进一步界定了泥石流容重取样、计算和校验方法,构建了泥石流灾害特征值计算中容重独立取值原则,即峰值流量、流速、冲压力等计算建议选取最大容重,而一次冲出固体物质总量、堵河危险性和危险区范围等计算建议选取平均容重。研究结果可为泥石流灾害防治提供参考。
Objectives:Density is the most fundamental parameter to describe the physical property of debris flow.It is of great significance for evaluation and mitigation of debris flow.Methods:Based on the temporal and spatial characteristics of hydrology process,considered the physical connotation of density,this paper described three characteristic values of debris flow density:max-density,peakdensity,and mean-density.By used the debris flow observation data in Jiangjia gully since 1987,the distribution law and influencing factors of density are also analyzed Results:The result shows that those three characteristic density values can be used to express the temporal and spatial evolution of debris flow process.The peak-density and mean-density both can be calculated by maxdensity.The density value is impacted by the peak discharge of debris flow,but not the Volume.A new method of density calculation,which contains the sampling of debris flow deposit,formula calculation,verification,and the principle of using,are established for debris flow mitigation.The max-density can be recommended for the calculation of peak discharge,velocity,and impact pressure,while the mean-density can be recommended for the calculation of the total volume of soil materials,the danger of river blocking,and the scope of dangerous areas.
作者
黄海
马东涛
HUANG Hai;MA Dongtao(Institute of Exploration Technology,CAGS,Chengdu,611734;Technical Center for Geological Hazard Prevention and Control,CGS,Chengdu,611734;Institute of Mountain Hazards and Environment,Chinese Academy of Science,Chengdu,610041)
出处
《地质论评》
CAS
CSCD
北大核心
2022年第1期205-216,共12页
Geological Review
基金
中国地质调查局地质调查项目(编号:DD20190644、20190505)
第二次青藏高原综合科学考察研究项目(编号:2019QZKK0903)的成果。
关键词
容重特征值
物理意义
峰值流量
校验方法
灾害防治
characteristic value
max-density
peak discharge
calibration method
debris flow mitigation
