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Hydrogeological controls of variable microbial water quality in a complex subtropical karst system in Northern Vietnam

Hydrogeology journal, 2018-11, Vol.26 (7), p.2297-2314 [Peer Reviewed Journal]

Springer-Verlag GmbH Germany, part of Springer Nature 2018 ;Hydrogeology Journal is a copyright of Springer, (2018). All Rights Reserved. ;ISSN: 1431-2174 ;EISSN: 1435-0157 ;DOI: 10.1007/s10040-018-1783-5

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Title:
Hydrogeological controls of variable microbial water quality in a complex subtropical karst system in Northern Vietnam
Author: Ender, Anna ; Goeppert, Nadine ; Goldscheider, Nico
Subjects: Aquatic Pollution ; Aquifers ; Bacteria ; Biological contamination ; Cartography ; Catchment area ; Catchment areas ; Coliforms ; Contamination ; Developing countries ; E coli ; Earth and Environmental Science ; Earth Sciences ; Escherichia coli ; Fecal coliforms ; Fractures ; Geology ; Geophysics/Geodesy ; Groundwater ; Groundwater management ; Groundwater protection ; Groundwater quality ; Health risks ; Hydrogeology ; Hydrology/Water Resources ; Infiltration ; Karst ; LDCs ; Microbial contamination ; Microorganisms ; Pollution sources ; Protection ; Rainy season ; Shallow wells ; Stream pollution ; Streams ; Temporal variability ; Temporal variations ; Tracers ; Vulnerability ; Waste Water Technology ; Water Management ; Water pollution ; Water Pollution Control ; Water pollution prevention ; Water protection ; Water quality ; Water Quality/Water Pollution ; Water springs ; Water types ; Wet season
Is Part Of: Hydrogeology journal, 2018-11, Vol.26 (7), p.2297-2314
Description: Karst aquifers are particularly vulnerable to bacterial contamination. Especially in developing countries, poor microbial water quality poses a threat to human health. In order to develop effective groundwater protection strategies, a profound understanding of the hydrogeological setting is crucial. The goal of this study was to elucidate the relationships between high spatio-temporal variability in microbial contamination and the hydrogeological conditions. Based on extensive field studies, including mapping, tracer tests and hydrochemical analyses, a conceptual hydrogeological model was developed for a remote and geologically complex karst area in Northern Vietnam called Dong Van. Four different physicochemical water types were identified; the most important ones correspond to the karstified Bac Son and the fractured Na Quan aquifer. Alongside comprehensive investigation of the local hydrogeology, water quality was evaluated by analysis for three types of fecal indicator bacteria (FIB): Escherichia coli , enterococci and thermotolerant coliforms. The major findings are: (1) Springs from the Bac Son formation displayed the highest microbial contamination, while (2) springs that are involved in a polje series with connections to sinking streams were distinctly more contaminated than springs with a catchment area characterized by a more diffuse infiltration. (3) FIB concentrations are dependent on the season, with higher values under wet season conditions. Furthermore, (4) the type of spring capture also affects the water quality. Nevertheless, all studied springs were faecally impacted, along with several shallow wells within the confined karst aquifer. Based on these findings, effective protection strategies can be developed to improve groundwater quality.
Publisher: Berlin/Heidelberg: Springer Berlin Heidelberg
Language: English
Identifier: ISSN: 1431-2174
EISSN: 1435-0157
DOI: 10.1007/s10040-018-1783-5
Source: ProQuest Central

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Hydrogeological controls of variable microbial water quality in a complex subtropical karst system in Northern Vietnam

Springer-Verlag GmbH Germany, part of Springer Nature 2018 ;Hydrogeology Journal is a copyright of Springer, (2018). All Rights Reserved. ;ISSN: 1431-2174 ;EISSN: 1435-0157 ;DOI: 10.1007/s10040-018-1783-5

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