喀斯特地区深水型水库重金属分布特征、影响因素及来源——以龙滩水库为例

doi:10.12066/j.issn.1007-2861.2289

Abstract

Abstract:

In order to reveal the influencing factors and sources of the temporal and spatial variation of dissolved heavy metals in karst deep-water reservoirs, this paper selected Longtan Reservoir in Pearl River basin as the research object, and analysed the dissolved heavy metals in stratified water, surface water of tributaries flowing into the reservoir area and discharged water in July 2019 and January 2020, as well as the hydrochemical parameters of the reservoir area in April, July, October 2019 and January 2020. Through Piper diagram of main ions, Pearson correlation analysis among the different kinds of heavy metals, cluster analysis and canonical correlation analysis (CCA) between environmental factors and dissolved heavy metals, the results showed that the weathering of carbonate rocks in the basin was an important external source of dissolved heavy metals in Longtan Reservoir. The change in relative water column stability (RWCS) caused by the seasonal thermal stratification of reservoir water body was the main factor affecting the spatial and temporal distribution of dissolved heavy metals in the study area. Higher RWCS usually promoted the release of Cr and Cu, whereas lower RWCS promoted the release of Fe and As. This study provided a theoretical basis for exploring the relationship between hydrodynamic conditions and dissolved heavy metals, and had important guiding significance for scientific utilization and protection of water resources in karst deep-water reservoirs.

Key words: deep water reservoir, dissolved heavy metals, relative water column stability (RWCS), seasonal thermal stratification, spatio-temporal distribution

CLC Number:

X524

GUAN Tianhao, LI Xiaodong, WANG Yiyao, YANG Mengdi, CUI Gaoyang, DING Shiyuan, ZHANG Xuecheng. Distribution characteristics, influencing factors and sources of heavy metals in karst deep-water reservoirs: a case study of Longtan Reservoir[J]. Journal of Shanghai University（Natural Science Edition）, 2021, 27(2): 236-249.

Figures/Tables 9

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Distribution characteristics, influencing factors and sources of heavy metals in karst deep-water reservoirs: a case study of Longtan Reservoir

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[2]	GUAN Tianhao, LI Xiaodong, WANG Yiyao, YANG Mengdi, CUI Gaoyang, DING Shiyuan, ZHANG Xuecheng. Distribution characteristics, influencing factors and sources of heavy metals in karst deep-water reservoirs: A case study of Longtan Reservoir [J]. Journal of Shanghai University（Natural Science Edition）, 0, (): 1-.