Evaluation of vulnerable zones to water pollution in the lower Soummam alluvial aquifer, Bejaia, Algeria

Understanding the critical relationship between the Soummam River and its alluvial aquifer is crucial for the protection of this vital water resource. The approach is based on monitoring the spatial and temporal evolution of physico-chemical parameters and identifying their origin through correlatio...

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Bibliographic Details
Published in:Water policy 2024-04, Vol.26 (4), p.321-335
Main Authors: Ouyahia, Nadia, Saou, Abdelhamid, Maza, Mustapha, Bouchraki, Faiza
Format: Article
Language:English
Subjects:
alluvial aquifer
Alluvial aquifers
Aquifers
Boreholes
Case studies
Chemicals
Data collection
Drinking water
Environmental risk
Geology
Groundwater
hydrogeochemical tracers
Hydrogeochemistry
hydrogeological threshold
infiltration-drainage
Information management
lower soummam
Monitoring systems
Parameter identification
Physicochemical processes
Piezometers
Rivers
Sampling
Surface water
Tracers
Tracking
Water exchange
Water pollution
Water quality
Water resources
Water supply
Water wells
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Summary:Understanding the critical relationship between the Soummam River and its alluvial aquifer is crucial for the protection of this vital water resource. The approach is based on monitoring the spatial and temporal evolution of physico-chemical parameters and identifying their origin through correlation with the geology and piezometry of the alluvial aquifer; this will be achieved using differential gauging and hydrogeochemical tracing. This will provide valuable information for the management and protection of this precious water resource. The case study focuses on the alluvial aquifer of the lower Soummam Valley in Bejaia, Algeria, where a unique natural barrier upstream creates a close hydraulic relationship between the river and the aquifer. This allows for water exchange, which we investigated through two sampling campaigns (high and low water) at 32 water points (boreholes, wells and stations). By tracking the movement of special chemical tracers in both the Soummam River and the underlying alluvial aquifer, this study confirms a direct hydraulic connection between them. This means that water can flow from the river into the aquifer, highlighting the potential risk of water pollution. This has helped us to identify areas where pollution from the river could seep into the groundwater, threatening the drinking water supply.
ISSN:1366-7017
1996-9759
DOI:10.2166/wp.2024.120