Managed Aquifer Recharge in fractured crystalline rock aquifers: Impact of horizontal preferential flow on recharge dynamics

摘要: Abstract To overcome water scarcity issues, Managed Aquifer Recharge (MAR) structures are currently developed in many parts of the world, including poorly permeable terrain like weathered crystalline rocks. In such geological context, characterized by relatively limited groundwater storage mainly associated with fractures located at interface between upper layer (saprolite) and fractured bedrock, efficiency MAR is known. address this question better understand factors that control recharge dynamics, an artificial basin was implemented Experimental Hydrogeological Park Telangana (South India), a well-equipped continuously monitored site situated Archean granitic terrain. The thickness saprolite hydraulic properties well known all over from previous geophysical surveys tests. characterize has been different boreholes surrounding infiltration basin. Infiltration rates level data interpreted both volume balance approach analytical solutions. addition, simple numerical model used to show how depth granite controls dynamics observed levels variations. Results permeability saprolite/bedrock sufficiently large allow efficient propagates laterally throughout aquifer through connected interface. However, variable pathway response, acting as semi-impervious boundary, leading remarkable Thus, our findings characteristics most pathways we variations may be inferred monitoring during events.