Impacts of water-sediment regulation on spatial-temporal variations of heavy metals in riparian sediments along the middle and lower reaches of the Yellow River

The water-sediment regulation scheme (WSRS) of dams influences the desorption, resuspension, and deposition processes of riparian sediments, which in turn affect the spatial-temporal variations of heavy metals (HMs) in riparian sediments and leads to severe degradation of soil and water quality. How...

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Autores principales:	Qinghe Zhao, Shengyan Ding, Zhendong Hong, Xiaoyu Ji, Shuoqian Wang, Mengwen Lu, Yaru Jing
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Water-sediment regulation Riparian sediments Heavy metals Xiaolangdi Dam Yellow River Environmental pollution TD172-193.5 Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/e9b4e136d06f47bf974dfa297db9d6c4
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spelling	oai:doaj.org-article:e9b4e136d06f47bf974dfa297db9d6c42021-11-06T04:18:55ZImpacts of water-sediment regulation on spatial-temporal variations of heavy metals in riparian sediments along the middle and lower reaches of the Yellow River0147-651310.1016/j.ecoenv.2021.112943https://doaj.org/article/e9b4e136d06f47bf974dfa297db9d6c42021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S0147651321010551https://doaj.org/toc/0147-6513The water-sediment regulation scheme (WSRS) of dams influences the desorption, resuspension, and deposition processes of riparian sediments, which in turn affect the spatial-temporal variations of heavy metals (HMs) in riparian sediments and leads to severe degradation of soil and water quality. However, the difference between the trapping effect of dams and the redistribution effects of the WSRS on HMs in riparian sediments, as well as the consecutively seasonal change of HMs after the WSRS, are rarely reported. To fill this gap, the concentrations of six HMs including Cd, Cr, Cu, Ni, Pb, and Zn in riparian sediments along the Xiaolangdi Dam (XLD) Reservoir and its downstream reach were investigated, and the contamination level and potential ecological risk of HMs were assessed, to differentiate the effects of the XLD and its WSRS on the concentration, contamination level, and potential ecological risks of HMs. The results indicated that the mean HM concentrations in riparian sediments were higher than the background values in the study area and showed significant spatial and temporal variations. However, the regional differences of HM concentrations caused by the trapping effect of the XLD were less than the seasonal differences caused by the redistribution effects of the WSRS. The contamination and ecological risk assessment indicated that riparian sediments in the study area were contaminated by the six HMs, particularly by Cd and Pb, which overall exhibited a high and moderate ecological risk, respectively. The sources for Pb were likely agricultural inputs, while the sources for Cd should be attributed to both industrial and agricultural inputs. Overall, the trapping effect of the XLD led to the accumulation of HMs in riparian sediments along the reservoir area, while the regulation effects of the WSRS resulted in the redistribution of HMs in riparian sediments from the reservoir area to the downstream reach.Qinghe ZhaoShengyan DingZhendong HongXiaoyu JiShuoqian WangMengwen LuYaru JingElsevierarticleWater-sediment regulationRiparian sedimentsHeavy metalsXiaolangdi DamYellow RiverEnvironmental pollutionTD172-193.5Environmental sciencesGE1-350ENEcotoxicology and Environmental Safety, Vol 227, Iss , Pp 112943- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Water-sediment regulation Riparian sediments Heavy metals Xiaolangdi Dam Yellow River Environmental pollution TD172-193.5 Environmental sciences GE1-350
spellingShingle	Water-sediment regulation Riparian sediments Heavy metals Xiaolangdi Dam Yellow River Environmental pollution TD172-193.5 Environmental sciences GE1-350 Qinghe Zhao Shengyan Ding Zhendong Hong Xiaoyu Ji Shuoqian Wang Mengwen Lu Yaru Jing Impacts of water-sediment regulation on spatial-temporal variations of heavy metals in riparian sediments along the middle and lower reaches of the Yellow River
description	The water-sediment regulation scheme (WSRS) of dams influences the desorption, resuspension, and deposition processes of riparian sediments, which in turn affect the spatial-temporal variations of heavy metals (HMs) in riparian sediments and leads to severe degradation of soil and water quality. However, the difference between the trapping effect of dams and the redistribution effects of the WSRS on HMs in riparian sediments, as well as the consecutively seasonal change of HMs after the WSRS, are rarely reported. To fill this gap, the concentrations of six HMs including Cd, Cr, Cu, Ni, Pb, and Zn in riparian sediments along the Xiaolangdi Dam (XLD) Reservoir and its downstream reach were investigated, and the contamination level and potential ecological risk of HMs were assessed, to differentiate the effects of the XLD and its WSRS on the concentration, contamination level, and potential ecological risks of HMs. The results indicated that the mean HM concentrations in riparian sediments were higher than the background values in the study area and showed significant spatial and temporal variations. However, the regional differences of HM concentrations caused by the trapping effect of the XLD were less than the seasonal differences caused by the redistribution effects of the WSRS. The contamination and ecological risk assessment indicated that riparian sediments in the study area were contaminated by the six HMs, particularly by Cd and Pb, which overall exhibited a high and moderate ecological risk, respectively. The sources for Pb were likely agricultural inputs, while the sources for Cd should be attributed to both industrial and agricultural inputs. Overall, the trapping effect of the XLD led to the accumulation of HMs in riparian sediments along the reservoir area, while the regulation effects of the WSRS resulted in the redistribution of HMs in riparian sediments from the reservoir area to the downstream reach.
format	article
author	Qinghe Zhao Shengyan Ding Zhendong Hong Xiaoyu Ji Shuoqian Wang Mengwen Lu Yaru Jing
author_facet	Qinghe Zhao Shengyan Ding Zhendong Hong Xiaoyu Ji Shuoqian Wang Mengwen Lu Yaru Jing
author_sort	Qinghe Zhao
title	Impacts of water-sediment regulation on spatial-temporal variations of heavy metals in riparian sediments along the middle and lower reaches of the Yellow River
title_short	Impacts of water-sediment regulation on spatial-temporal variations of heavy metals in riparian sediments along the middle and lower reaches of the Yellow River
title_full	Impacts of water-sediment regulation on spatial-temporal variations of heavy metals in riparian sediments along the middle and lower reaches of the Yellow River
title_fullStr	Impacts of water-sediment regulation on spatial-temporal variations of heavy metals in riparian sediments along the middle and lower reaches of the Yellow River
title_full_unstemmed	Impacts of water-sediment regulation on spatial-temporal variations of heavy metals in riparian sediments along the middle and lower reaches of the Yellow River
title_sort	impacts of water-sediment regulation on spatial-temporal variations of heavy metals in riparian sediments along the middle and lower reaches of the yellow river
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/e9b4e136d06f47bf974dfa297db9d6c4
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Impacts of water-sediment regulation on spatial-temporal variations of heavy metals in riparian sediments along the middle and lower reaches of the Yellow River

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