干旱区生态环境知识资源中心(Arid): Dynamics of metals bound to suspended sediments in floods and on channel banks of the ephemeral Wadi Sekher, northern Negev desert, Israel

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DOI	10.1016/j.catena.2018.08.018
	Dynamics of metals bound to suspended sediments in floods and on channel banks of the ephemeral Wadi Sekher, northern Negev desert, Israel
	Balaban, Noa 1,3; Laronne, Jonathan B.2; Feinstein, Shimon 1; Vaisblat, Gal 2
通讯作者	Balaban, Noa
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2019
卷号	172 页码:243-254
英文摘要	This study examines the variation in the concentration of eight heavy metals (Cu, Ni, Pb, Cd, Cr, Co, V, Sc) bound on suspended sediments during flow events and those deposited in channel banks. The study was undertaken in Wadi Sekher, an ephemeral flash-flood channel draining the Neot Hovav industrial chemical complex in the semi-arid northern Negev, Israel, at sites varying with bank height and distance from the industrial complex. Metal concentrations were found to be higher in the initial flow and recession than during peak flow. Bound metal concentrations were mainly affected by suspended sediment composition and concentrations. During peak flow the suspended sediment concentration rises and quartz sand is a major constituent. This leads to a decrease in bound metal concentrations, as the larger particles have a weaker affinity to binding. In six sediment samples, taken during the first 15 min of two floods, the bound metal concentrations changed similarly. These changes are suggested to represent variations in the source and cannot be attributed to dilution or binding effects. Six banks were sampled along Wadi Sekher, from the Neot Hovav hydrometric reach downstream to the confluence of Wadi Sekher and Wadi Beer-Sheva, at specified heights, following a bank-full flood. In every crosssection, a significant difference (p < 0.01) was seen in Cu, Cd, Co, V and Sc concentrations with bank height, with highest concentrations at bank-bed intersection. Downstream variations in bound metal concentrations along Wadi Sekher were statistically (p > 0.05) undifferentiated, indicating that the industrial area is not a source point for these metals, and that a constant input exists into the channel from tributaries along the channel. Due to the difficulty in sampling flash floods in ephemeral channels, existing data are not abundant, and our understanding of these environments is therefore limited. This study improves knowledge of interrelated variations in bound metal concentrations in fluvial deposits, in suspended sediment and in water during flash floods.
英文关键词	Ephemeral channel Flash-floods Metals Suspended-sediments Semi-arid
类型	Article
语种	英语
国家	Israel
收录类别	SCI-E
WOS记录号	WOS:000449136800024
WOS关键词	HEAVY-METALS ; GEOMORPHIC PROCESSES ; SURFACE SEDIMENTS ; RIVER ; DISPERSAL ; STORAGE ; ENVIRONMENT ; WATER ; DESERTIFICATION ; VARIABILITY
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向	Geology ; Agriculture ; Water Resources
来源机构	Ben-Gurion University of the Negev
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/214798
作者单位	1.Ben Gurion Univ Negev, Dept Geol & Environm Sci, Beer Sheva, Israel; 2.Ben Gurion Univ Negev, Dept Geog & Environm Dev, Beer Sheva, Israel; 3.Ben Gurion Univ Negev, ZIWR, Jacob Blaustein Inst Desert Res, Dept Environm Hydrol & Microbiol EHM, Beer Sheva, Israel
推荐引用方式 GB/T 7714	Balaban, Noa,Laronne, Jonathan B.,Feinstein, Shimon,et al. Dynamics of metals bound to suspended sediments in floods and on channel banks of the ephemeral Wadi Sekher, northern Negev desert, Israel[J]. Ben-Gurion University of the Negev,2019,172:243-254.
APA	Balaban, Noa,Laronne, Jonathan B.,Feinstein, Shimon,&Vaisblat, Gal.(2019).Dynamics of metals bound to suspended sediments in floods and on channel banks of the ephemeral Wadi Sekher, northern Negev desert, Israel.CATENA,172,243-254.
MLA	Balaban, Noa,et al."Dynamics of metals bound to suspended sediments in floods and on channel banks of the ephemeral Wadi Sekher, northern Negev desert, Israel".CATENA 172(2019):243-254.