Suspended sediment load, bed load, and dissolved load yields from a semiarid drainage basin: A 15-year study

被引:47
作者
Alexandrov, Yulia [1 ]
Cohen, Hai [1 ]
Laronne, Jonathan B. [1 ,2 ]
Reid, Ian [1 ,2 ]
机构
[1] Ben Gurion Univ Negev, Dept Geog & Environm Dev, IL-84105 Beer Sheva, Israel
[2] Univ Loughborough, Dept Geog, Loughborough, Leics, England
基金
英国自然环境研究理事会;
关键词
NORTHERN NEGEV; FLASH-FLOODS; HIGH-RATES; TRANSPORT; DESERT; RAINFALL; RIVER; VARIABILITY; GENERATION; CATCHMENT;
D O I
10.1029/2008WR007314
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A 15-year record for the semiarid upland Eshtemoa catchment provides a basis for estimating the efflux of water, sediment, and solutes in a type of environment for which there is a dearth of information. Average annual runoff was 5.4 mm, giving a runoff coefficient of 2.1%. Average annual yields were 275 Mg km(-2) for suspended sediment, 15.3 Mg km(-2) for bed load, and 0.6 Mg km(-2) for dissolved load, though distinct seasonal differences are identified and related to the prevalence of cellular, convectively enhanced storms in autumn and spring and frontal storms in winter. The majority of the average annual total sediment and solute yield of 291 Mg km(-2) is generated by as few as 8 of the 74 flow events of the 15-year record. The relative importance of bed load and the consequent ranking of the load components as suspended load >> bed load >> dissolved load distinguishes this dryland environment from its humid counterparts.
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页数:13
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