泥石流流域集水区面积限值与一级水系数目关系

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 成都山地所知识仓储（2009年以前）

	泥石流流域集水区面积限值与一级水系数目关系
	李泳; 韦方强; 胡凯衡
刊名	地理科学
	2005
卷号	25 期号:4 页码:473-477
关键词	泥石流流域水系一级水系集水区面积限值
其他题名	Relationship Between First-order Stream Number and Area Threshold for Debris Flow Basin
通讯作者	胡凯衡
合作状况	其它
中文摘要	文章利用ArcInfo的水文分析功能，从不同区域的三条典型泥石流沟的数字高程模型中提取出不同限值下的水系，然后研究了不同集水区面积下限导致的流域水系细节层次的变化，发现一级水系的数目和集水区面积下限成近似于反比的关系，而反比关系的比例系数只与流域面积有关。这种关系反映了泥石流流域的水系在空间尺度变换下的某种自相似性，也说明了泥石流流域在相当宽的空间尺度范围内一级子流域的物质活动能力是一定的。
英文摘要	Dra inages can show more complex structure at the smaller scale, wh ich is the representation of the corresponding basin s' sel-f sim ilarity. The deta iled structures for different debris flow basins reflect the ir ab ility to transport materia,l wh ich suggests that the sma l-l scale structure p lays an important ro le in the debr is f low fo rmat ion. Therefore, the paper focuses on the dra inage h ierarchical characteristic o f debris flow basin, and two basin parameters ( firs-t o rder stream number and area thresho ld) are used to exam ine th is character istic because the tw o are not affected by stream ordering methods and DEM errors. Three typical debris flow basins w ith different catchment area ( Jiang jia, Longdong and Gux iang Rav ine) w ere studied, w hich respective ly located in three d ist inct regions. U sing hydrolog ical ana lysis too l in A rcInfo so ftw are the stream netw orks w ith d ifferent catchment area thresholds w ere extracted from these basins 'DEM and one set o f firs-t order subbasin w as identif ied. It is obv-i ous that these subbasins occupy the who le basin s' fringe reg ion wheremass transportation starts. So th is suggests that the subbasins p lay an impo rtant ro le in the in itiation andm aterial supp ly o f debris flow s. A nother po int is that the number of extracted f irs-t order stream decreases rap id ly w ith the area threshold increasing. It is found that the tw o parameters have close relationN = RA a m have close relat ion, and exponenta equals to - 1 and coe-f ficient k only re lates to the total basin area, namely for the sam e basin the product of firs-t order numberw ith area threshold is constant in a w ide sca le range. The relat ionship may show that the ab ility of debris flow basin to transport material doesn t' change in so w ide scale range. Further research w ill be paidmore attention to the d ist inction o f exponent a and coe ff icient k betw een debris-flow basin and non-debris-flow basin.
分类号	TP399
资助信息	国家自然科学基金(40101001);中国科学院成都山地灾害与环境研究所青年种子基金(2003)
语种	中文
公开日期	2010-07-14
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/671]
专题	成都山地灾害与环境研究所_成都山地所知识仓储（2009年以前）成都山地灾害与环境研究所_山地灾害与地表过程重点实验室
推荐引用方式 GB/T 7714	李泳,韦方强,胡凯衡. 泥石流流域集水区面积限值与一级水系数目关系[J]. 地理科学,2005,25(4):473-477.
APA	李泳,韦方强,&胡凯衡.(2005).泥石流流域集水区面积限值与一级水系数目关系.地理科学,25(4),473-477.
MLA	李泳,et al."泥石流流域集水区面积限值与一级水系数目关系".地理科学 25.4(2005):473-477.