Arid
DOI10.1016/j.geomorph.2003.12.003
Hydrological processes in a small and catchment: scale effects of rainfall and slope length
Yair, A; Raz-Yassif, N
通讯作者Yair, A
来源期刊GEOMORPHOLOGY
ISSN0169-555X
EISSN1872-695X
出版年2004
卷号61期号:1-2页码:155-169
英文摘要

Many studies have been concerned with the scale issue in geomorphology and hydrology. Most studies focus on the possibility of data transfer from small to large watersheds. Less attention has been given to the scale problem within very small watersheds where differences in slope length may seriously affect the spatial distribution and extent of runoff-contributing areas to the channel. It is usually assumed that runoff and erosion increase as slope length and angle increase. However, field observations in the Negev Highlands show positive relationships between slope length and deposition rates, regardless of slope angles. Short hillslopes are devoid of colluvial mantle, while thick colluvial deposits, with well-developed soil profiles indicative of long-term stability, are found at the base of long hillslopes. The hypothesis advanced is that temporal variations in effective rainfall control the spatial structures of surface properties that further enhance the effects of temporal variations in rainfall. Long-term monitoring of rainfall and runoff (1982-1998), conducted at spatial scales varying from few hundreds of m(2) up to 0.3 km(2), show a decrease in runoff at the hillstope scale. The low efficiency of runoff and erosion processes on long hillslopes is because the concentration time required for continuous flow along such slopes is longer than the duration of most effective rain showers prevailing in the area. Field data lead to the notion that runoff and erosion models in which a positive relationship between slope length and angle and runoff and erosion rates is assumed should not be applied to and and semiarid areas. More attention should be given in latter areas to the complex hydrological relationships between rainfall scales and spatial scales. The implications of data obtained regarding the spatial distribution of areas contributing to channel flow, at a geological time scale and under changing climatic conditions, are discussed. Published by Elsevier B.V.


英文关键词hillslope hydrology rainfall scales hillslope scale erosion and deposition processes contributing area geological time scale
类型Article
语种英语
国家Israel
收录类别SCI-E
WOS记录号WOS:000222627000011
WOS关键词NORTHERN NEGEV DESERT ; RUNOFF ; EROSION ; CLIMATE ; BASINS ; AREAS
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
来源机构Hebrew University of Jerusalem
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/146854
作者单位(1)Hebrew Univ Jerusalem, Dept Geog, IL-91905 Jerusalem, Israel
推荐引用方式
GB/T 7714
Yair, A,Raz-Yassif, N. Hydrological processes in a small and catchment: scale effects of rainfall and slope length[J]. Hebrew University of Jerusalem,2004,61(1-2):155-169.
APA Yair, A,&Raz-Yassif, N.(2004).Hydrological processes in a small and catchment: scale effects of rainfall and slope length.GEOMORPHOLOGY,61(1-2),155-169.
MLA Yair, A,et al."Hydrological processes in a small and catchment: scale effects of rainfall and slope length".GEOMORPHOLOGY 61.1-2(2004):155-169.
条目包含的文件
条目无相关文件。
个性服务
推荐该条目
保存到收藏夹
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[Yair, A]的文章
[Raz-Yassif, N]的文章
百度学术
百度学术中相似的文章
[Yair, A]的文章
[Raz-Yassif, N]的文章
必应学术
必应学术中相似的文章
[Yair, A]的文章
[Raz-Yassif, N]的文章
相关权益政策
暂无数据
收藏/分享

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。