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Applying spatial re...
Applying spatial regression to evaluate risk factors for microbiological contamination of urban groundwater sources in Juba, South Sudan
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- Engström, Emma, 1982- (författare)
- KTH,Mark- och vattenteknik,Transportvetenskap,Environmental Management and Assessment,Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH)
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- Mörtberg, Ulla (författare)
- KTH,Mark- och vattenteknik,Environmental Management and Assessment,Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH)
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- Karlström, Anders (författare)
- KTH,Transportvetenskap,Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH)
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- Mangold, Mikael (författare)
- Chalmers University of Technology, Sweden; Watsan MSF-OCB, Sudan,Chalmers tekniska högskola,Läkare utan gränser (MSF),Médecins Sans Frontières (MSF)
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(creator_code:org_t)
- 2016-12-13
- 2017
- Engelska.
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Ingår i: Hydrogeology Journal. - : Springer Verlag. - 1431-2174 .- 1435-0157. ; 25:4, s. 1077-1091
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Abstract
Ämnesord
Stäng
- This study developed methodology for statistically assessing groundwater contamination mechanisms. It focused on microbial water pollution in low-income regions. Risk factors for faecal contamination of groundwater-fed drinking-water sources were evaluated in a case study in Juba, South Sudan. The study was based on counts of thermotolerant coliforms in water samples from 129 sources, collected by the humanitarian aid organisation Médecins Sans Frontières in 2010. The factors included hydrogeological settings, land use and socio-economic characteristics. The results showed that the residuals of a conventional probit regression model had a significant positive spatial autocorrelation (Moran’s I = 3.05, I-stat = 9.28); therefore, a spatial model was developed that had better goodness-of-fit to the observations. The most significant factor in this model (p-value 0.005) was the distance from a water source to the nearest Tukul area, an area with informal settlements that lack sanitation services. It is thus recommended that future remediation and monitoring efforts in the city be concentrated in such low-income regions. The spatial model differed from the conventional approach: in contrast with the latter case, lowland topography was not significant at the 5% level, as the p-value was 0.074 in the spatial model and 0.040 in the traditional model. This study showed that statistical risk-factor assessments of groundwater contamination need to consider spatial interactions when the water sources are located close to each other. Future studies might further investigate the cut-off distance that reflects spatial autocorrelation. Particularly, these results advise research on urban groundwater quality. © 2016, The Author(s).
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Naturresursteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Environmental Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Samhällsbyggnadsteknik -- Vattenteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Civil Engineering -- Water Engineering (hsv//eng)
- NATURVETENSKAP -- Biologi -- Mikrobiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Microbiology (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Oceanografi, hydrologi och vattenresurser (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Oceanography, Hydrology and Water Resources (hsv//eng)
Nyckelord
- Health
- Microbial processes
- Statistical modeling
- Sub-Saharan Africa
- Urban groundwater
- coliform bacterium
- feces
- groundwater pollution
- microbiology
- numerical model
- regression analysis
- risk factor
- Central Equatoria
- Juba
- South Sudan
- Land and Water Resources Engineering
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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