Dynamics and sources of colloids in shallow groundwater in lowland wells and fracture flow in sloping farmland

doi:10.1016/j.watres.2019.03.012

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地灾害与地表过程重点实验室

	Dynamics and sources of colloids in shallow groundwater in lowland wells and fracture flow in sloping farmland
	Zhang, Wei1,2,3 ; Cheng, Jian-Hua 2,3; Xian, Qing-Song2,3 ; Cui, Jun-Fang2,3 ; Tang, Xiang-Yu2,3 ; Wang, Gen-Xu2,3
刊名	WATER RESEARCH
	2019-06-01
卷号	156 页码:252-263
关键词	Fracture flow Groundwater Colloid transport Source identification
ISSN号	0043-1354
DOI	10.1016/j.watres.2019.03.012
通讯作者	Cui, Jun-Fang(jfcui@imde.ac.cn)
英文摘要	Field-scale studies of natural colloid mobilization and transport in finely fractured aquifer as well as the source identification of groundwater colloids are of great importance to the safety of shallow groundwater. In this study, the daily monitoring of fracture flow from a sloping farmland plot and the biweekly monitoring of three lowland shallow wells within the same catchment were carried out simultaneously in 2013. The effects of physicochemical perturbations on groundwater colloid dynamics were explored in detail using partial redundancy analysis, structural equation modeling, Pearson correlation and multi linear regression analyses. The characterization and source identification of groundwater colloids were addressed via multiple parameters. The daily colloid concentration in the fracture flow varied between 0.54 and 31.90 mg/L (1.64 mg/L on average). Unique periods of high colloid concentration (5.59 mg/L on average) occurred during the initially generated flow following the dry season. In comparison, a narrower colloid concentration range of 0.24-11.66 mg/L was observed in the lowland shallow wells, with a smaller temporal variation than that of the fracture flow. A low percentage (2.4-7.0%) of colloids and a high percentage (47.7-92.0%) of coarse particles (2-10 mu m) were present in the lowland well water. Hydraulic perturbation by rainwater infiltration in the sloping farmland was the dominant mechanism for colloid mobilization in general; this effect retreated to secondary importance behind chemical perturbations (pH, Mg2+ and DOC) at low flow discharges (<13 L/min). In contrast, water chemistry (e.g., EC, cations and DOC concentrations) exhibited a major effect on colloid dynamics in the water of the lowland wells, except for the extremely high-salinity water of one well, in which water temperature showed a negative dominant influence on colloid stability. The combined use of multiple parameters (e.g., mineral composition and organic matter, calcium carbonate and delta C-13 contents) traced groundwater colloids to the shallow soil in the upper farmlands. It is strongly advised that in finely fractured aquifers within agricultural catchments, not only the small colloids but also the coarse particles in the size range of 2 -10 mu m should be monitored in case of colloid-associated contamination from agricultural wastes e.g., N, P, pesticides and/or heavy metals, especially at the early stages of the rainy seasons. (C) 2019 Published by Elsevier Ltd.
资助项目	National Natural Science Foundation of China[41790431] ; National Natural Science Foundation of China[41601539] ; 135 Strategic Program of the Institute of Mountain Hazards and Environment[SDS-135-1702] ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences[QYZDJ-SSW-DQC006] ; Science and Technology Program of the Chongqing Education Commission[KJ1600615]
WOS关键词	SATURATED POROUS-MEDIA ; IONIC-STRENGTH ; PARTICLE-SIZE ; NATURAL COLLOIDS ; SUBSURFACE FRACTURE ; INORGANIC COLLOIDS ; ORGANIC-MATTER ; TRANSPORT ; WATER ; MOBILIZATION
WOS研究方向	Engineering ; Environmental Sciences & Ecology ; Water Resources
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000466618400024
资助机构	National Natural Science Foundation of China ; 135 Strategic Program of the Institute of Mountain Hazards and Environment ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences ; Science and Technology Program of the Chongqing Education Commission
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/26229]
专题	成都山地灾害与环境研究所_山地灾害与地表过程重点实验室成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室
通讯作者	Cui, Jun-Fang
作者单位	1.Chongqing Technol & Business Univ, Sch Tourism & Land Resource, Chongqing 400067, Peoples R China 2.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Ecol Regulat, Chengdu 610041, Sichuan, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Wei,Cheng, Jian-Hua,Xian, Qing-Song,et al. Dynamics and sources of colloids in shallow groundwater in lowland wells and fracture flow in sloping farmland[J]. WATER RESEARCH,2019,156:252-263.
APA	Zhang, Wei,Cheng, Jian-Hua,Xian, Qing-Song,Cui, Jun-Fang,Tang, Xiang-Yu,&Wang, Gen-Xu.(2019).Dynamics and sources of colloids in shallow groundwater in lowland wells and fracture flow in sloping farmland.WATER RESEARCH,156,252-263.
MLA	Zhang, Wei,et al."Dynamics and sources of colloids in shallow groundwater in lowland wells and fracture flow in sloping farmland".WATER RESEARCH 156(2019):252-263.