Delineating groundwater contamination risks in southern coastal metropoles through implementation of geochemical and socio-environmental data in decision-tree and geographical information system

Bertrand, Guillaume; Petelet‐Giraud, Emmanuelle; Cary, Lise; Hirata, Ricardo; Montenegro, Suzana Maria Gico Lima; Paiva, Anderson Luiz Ribeiro de; Mahlknecht, Jürgen; Coelho, Victor; Almeida, Cristiano das Neves

doi:10.1016/j.watres.2021.117877

Cited by 17 publications

(8 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is in this context that the present study was conducted in the Lefock watershed area, in Cameroon. This area is representative of many semi-urban areas where self-access to water combined with weak socio-environmental conditions may cause contamination of the resource that in turn triggers adverse health and socio-environmental effects, as is well observed elsewhere such as in densely populated metropoles (Bertrand et al 2022).…”

Section: ; Scalize Et Al 2021)mentioning

confidence: 99%

Environmental factors controlling contamination and vulnerability of water alternative supply points in Lefock semi-urban watershed, West Cameroon

Tontsa

Temgoua

BERTRAND³

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

Due to the poorly managed water network of the Dschang municipality (West Cameroun), the peri-urban population of the Lefock watershed, frequently, consumes doubtful quality water from alternative supply points (WASPs): spring, well, river, borehole. In this context, the present study aimed to explore the influence of close environment on the possible contamination of these resources. For this purpose, 22 WASPs were characterized (within a 10 m radius of the point) both from physiographic (nature of bedrock, water supply utility, soil type, land use) and anthropogenic (presence of pit latrines, domestic wastewater, domestic breeding, agricultural activities, wild garbage dump, washing clothes on-site). Then, chemical (NO3−, NH4+, PO43−) and bacteriological (faecal coliforms, faecal streptococci, total coliforms, and E. coli) contamination parameters were analyzed and compared with the World Health Organisation (WHO) standards. Multiple Factor Analysis (MFA) was done, using water quality variables as input combined with environmental data as supplementary data. It revealed that waters from WASPs were generally of very poor bacterial quality, due to proximity with pit latrines, domestic wastewaters, and/or agricultural plots. NO3− is exceptionally high where WASPs are close to agricultural plots and/or domestic wastewaters. The MFA showed that the chemical degradation of WASP mostly results from wider scale processes and is representative of diffuse (and likely long-term) impacts on the resource. In contrast, bacteriological contaminations were better governed by immediate contexts and appears to result from the combination of anthropogenic and physiographic constraints. Regarding vulnerability, the type of soil and the nature of the WASPs are the main influencing factors. The hydromorphic context accentuates the vulnerability, while the order of increasing vulnerability related to the type of WASPs is: spring - well and borehole - river. These results indicate that poor water management, combined with a limited consideration of local environmental specificities threatens the security and sustainability of this resource in semi-urbanized zones over heterogeneous aquifers, and argue for a twofold education effort for managers and end-users of the resource.

show abstract

Section: ; Scalize Et Al 2021)mentioning

confidence: 99%

Environmental factors controlling contamination and vulnerability of water alternative supply points in Lefock semi-urban watershed, West Cameroon

Tontsa

Temgoua

BERTRAND³

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…Previous studies have also demonstrated that DT has a good performance in assessing surface water quality. 44,45 3.5. Verification of Redundant Water Quality Indicators.…”

Section: Select the Validation Modelmentioning

confidence: 99%

Machine-Learning-Based Approach To Assessing Water Quality in a Specific Basin: The Case of Wujingang Basin

Zhang,

He,

Wang

et al. 2023

ACS EST Water

View full text Add to dashboard Cite

Multidimensional indicators of surface water are key to assessing the water quality. Cost and time could be saved if surface water can be accurately assessed by fewer indicators. Therefore, it is necessary to screen key water quality indicators for different basins. This study collected 35 water quality indicators (42 315 observations) along the Wujingang basin. Cluster analysis and correlation coefficients were used to identify homogeneous categories of water quality indicators. Frequent pattern mining (FPM) was used to remove redundant indicators. Finally, the water quality assessment after the removal of redundant indicators was validated by classification analysis. Results of the silhouette coefficient and within-cluster sum of squared errors indicated that K-means was the optimal clustering model. Concomitant indicators Pb, Cl − , NO 3− , TN, V, and Al were identified using FPM. Decision tree verified that the performance did not decrease after removing Pb, Cl − , V, NO 3 − −N, and Al. These indicators were redundant for the Wujingang basin and could be monitored less frequently when there is no special use. This study provides important information for developing a selection framework based on multidimensional water quality data, which could serve as a baseline system for the selection of key water quality indicators in a specific basin.

show abstract

“…Contamination of groundwater has obvious implications for humans and is well studied from a human health perspective (Bertrand et al, 2022). However, the effects of contamination on groundwater dependent ecosystems are overall poorly documented (Manenti et al, 2021).…”

Section: Threats To Stygofauna In Coastal Aquifersmentioning

confidence: 99%

Stygofaunal diversity and ecological sustainability of coastal groundwater ecosystems in a changing climate: The Australian paradigm

et al. 2022

View full text Add to dashboard Cite

Coastal aquifers are vital water sources for humanity. Their quality and the ecosystem services they provide depend on the integrity of their subterranean biota. However, current anthropogenic impacts such as climate change effects and coastal population growth place enormous pressure on the sustainability of these environments. Despite the significance of subterranean biota to ecosystem function and the delivery of ecosystem services, stygofauna—groundwater‐dwelling aquatic animals—have until recently been largely ignored in aquifer monitoring and management. This issue is of importance in both coastal and inland zones. Common threats in inland and coastal areas are water extraction, reduced recharge caused by aridification, and pollution, while, in coastal zones, additional complications arise from sea‐level change and salt water ingress. This review examines stygofaunal diversity, impacts, and future conservation challenges in coastal aquifers. Focussing on Australia, we provide a summary of the available data on stygofaunal communities and distributions; identify and describe potential threats to these communities across the diverse coastal regions of the continent; and propose future research priorities with the goal of facilitating the long‐term preservation of these ecosystems on the Australian continent. While we focus this review on Australia, the threats and management issues discussed are relevant globally. Recent subterranean studies in Australia have been primarily undertaken in inland areas, and while coastal data exist, ecological assessment of coastal subterranean ecosystems is incomplete, compromising the efficacy of conservation plans. This review indicates that the Australian continent hosts five major coastal stygofaunal biodiversity areas characterised by heterogeneous community assemblages, involving a total of 17 taxonomic groups spanning microscopic aquatic invertebrates to vertebrates. The most relevant impacts and threats identified were aquifer size reduction, intrusion of seawater, land clearing, contamination, and mining. Given the projections of increasing coastal development and subsequent loss or degradation of habitat during coming decades, it is important to improve our limited understanding of the ecology of coastal aquifers. Future research should include the refinement of biological assessment tools for coastal systems, functional and ecotoxicological studies, and faunal surveys of urban coastal aquifers. The recommendations and guidelines outlined in this review are applicable globally and provide a further step toward the sustainable use of coastal groundwater resources and the maintenance of healthy groundwater ecosystems.

show abstract

Delineating groundwater contamination risks in southern coastal metropoles through implementation of geochemical and socio-environmental data in decision-tree and geographical information system

Cited by 17 publications

References 50 publications

Environmental factors controlling contamination and vulnerability of water alternative supply points in Lefock semi-urban watershed, West Cameroon

Environmental factors controlling contamination and vulnerability of water alternative supply points in Lefock semi-urban watershed, West Cameroon

Machine-Learning-Based Approach To Assessing Water Quality in a Specific Basin: The Case of Wujingang Basin

Stygofaunal diversity and ecological sustainability of coastal groundwater ecosystems in a changing climate: The Australian paradigm

Contact Info

Product

Resources

About