摘要
以兰州市区南北两山96条沟道为例,选取泥石流形成的3个基本条件中的5个基本指标:汇水面积、主沟比降、主沟长、面积方量因子值、年最大洪峰流量均值,利用分形理论探讨了这些指标的基本规律,比较了泥石流沟道和普通沟道在分形分维规律上的异同。结果表明,泥石流沟道5个指标的分形分维值均较普通沟道小,且在泥石流沟道的5个指标中,汇水面积的分形分维值最小,说明其对泥石流的发育和形成影响最显著。
Taking 96 gullies in north and south mountains of Lanzhou urban area as the study samples and choosing five basic indexes of three basic conditions for formation of debris flow, i.e. catchment basin, main gully slope, main gully length, volume and mean value of annual maximum peak discharge, this paper compares the similarities and differences between flow gully and common gully in fractal regularity based on fractal theory, explores basic law of these indices. The results show that, fractal dimensions of debris flow gullies are all smaller than the dimensions of common gullies. Among them, the fractal dimensions of the catchment basin is the least, that is, the catchment basin brings the most significant influence to the formation and development of debris flow gullies.
出处
《自然灾害学报》
CSCD
北大核心
2014年第1期108-111,共4页
Journal of Natural Disasters
基金
国家科技支撑计划项目(2011BAK12B07)
甘肃省科学院青年科技创新基金项目(2012QN-16)
关键词
泥石流沟
泥石流沟地貌要素
分维
普通沟道
兰州市区
debris flow gully
relief factors of debris flow
fractal
common gully
Lanzhou urban area
