干旱区生态环境知识资源中心(Arid): Possible factors for increasing water salinity in an embanked coastal island in the southwest Bengal Delta of Bangladesh

Arid

DOI	10.1016/j.scitotenv.2020.136668
	Possible factors for increasing water salinity in an embanked coastal island in the southwest Bengal Delta of Bangladesh
	Akter, Simu 1; Ahmed, Kazi Rifat 2; Marandi, Andres 3; Schueth, Christoph 1
通讯作者	Akter, Simu
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2020
卷号	713
英文摘要	Increasing water salinity in coastal areas is a concern for the coastal environment. Increased salinity is affecting water quality, freshwater availability, and water-related ecosystems in the southwest coastal region of the Bengal Delta. The study used a synergies and robust approach to assess the possible factors for increasing water salinity in an embanked coastal island in the southwest Bengal Delta. The hydrochemical analysis revealed that surface and groundwater are enriching with Na+ and Cl- concentration, also controlling by seawater through the ion ex- change mechanism (Ca2+ and Mg2+ replacing by Na+, and Cl-), mixing stage of water solution (freshwater-saltwater), and anthropogenic salt contamination by human activities (e.g., saltwater shrimp cultivation and excessive irrigation). Piper diagram showed that river water is occupying at the mixing stage of solution, where pond and groundwater are occupying at seawater (saline) zone. The water quality index showed that surface water is not fresh anymore and unsuitable for drinking purposes. The isotope analyses exposed the presence of strong precipita- tion variance in the study area Cluster observation analysis showed a strong correlation between Na+, Cl-, and TDS (similarity is 97% to 99%). The remote sensing application illustrated that high salinity zones are in the northern part, and groundwater salinity is higher (7.5 to 8 ppt) in the northern part of polder 32. The salinity of both groundwater and surface water showed a positive correlation with land surface temperature and potential evapotranspiration. The study exposed four responding factors for increasing groundwater salinity in this region, which are - regional surface geological settings, hydrological settings, hydraulic head gradient, and human activities. A conceptual model illustrated the presence of lateral recharge of saltwater from the surrounding tidal rivers to the groundwater. (C) 2020 Elsevier B.V. All rights reserved.
英文关键词	Water salinity Hydrochemistry Remote sensing Water quality index Coastal island Bengal Delta
类型	Article
语种	英语
国家	Germany ; Switzerland ; Estonia
收录类别	SCI-E
WOS记录号	WOS:000514544700110
WOS关键词	SEAWATER INTRUSION ; SALTWATER INTRUSION ; QUALITY INDEX ; GROUNDWATER SALINIZATION ; FRESH-WATER ; ARID-REGION ; RIO-GRANDE ; RIVER ; MANAGEMENT ; AQUIFER
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/315528
作者单位	1.Tech Univ Darmstadt, Inst Appl Geosci, Trop Hydrogeol & Environm Engn, Darmstadt, Germany; 2.Univ Zurich, Dept Geog, Remote Sensing Water Syst, Zurich, Switzerland; 3.Geol Survey Estonia, Hydrogeol & Environm Geol, Tallinn, Estonia
推荐引用方式 GB/T 7714	Akter, Simu,Ahmed, Kazi Rifat,Marandi, Andres,et al. Possible factors for increasing water salinity in an embanked coastal island in the southwest Bengal Delta of Bangladesh[J],2020,713.
APA	Akter, Simu,Ahmed, Kazi Rifat,Marandi, Andres,&Schueth, Christoph.(2020).Possible factors for increasing water salinity in an embanked coastal island in the southwest Bengal Delta of Bangladesh.SCIENCE OF THE TOTAL ENVIRONMENT,713.
MLA	Akter, Simu,et al."Possible factors for increasing water salinity in an embanked coastal island in the southwest Bengal Delta of Bangladesh".SCIENCE OF THE TOTAL ENVIRONMENT 713(2020).