Print Email Facebook Twitter Small-Scale ASR Between Flow Barriers in a Saline Aquifer Title Small-Scale ASR Between Flow Barriers in a Saline Aquifer Author van Ginkel, M. (TU Delft Water Resources; Royal HaskoningDHV) des Tombe, B.F. (TU Delft Water Resources) Olsthoorn, T.N. (TU Delft Water Resources; Waternet) Bakker, M. (TU Delft Water Resources) Date 2016 Abstract Regular aquifer storage recovery, ASR, is often not feasible for small-scale storage in brackish or saline aquifers because fresh water floats to the top of the aquifer where it is unrecoverable. Flow barriers that partially penetrate a brackish or saline aquifer prevent a stored volume of fresh water from expanding sideways, thus increasing the recovery efficiency. In this paper, the groundwater flow and mixing is studied during injection, storage, and recovery of fresh water in a brackish or saline aquifer in a flow-tank experiment and by numerical modeling to investigate the effect of density difference, hydraulic conductivity, pumping rate, cyclic operation, and flow barrier settings. Two injection and recovery methods are investigated: constant flux and constant head. Fresh water recovery rates on the order of 65% in the first cycle climbing to as much as 90% in the following cycles were achievable for the studied configurations with constant flux whereas the recovery efficiency was somewhat lower for constant head. The spatial variation in flow velocity over the width of the storage zone influences the recovery efficiency, because it induces leakage of fresh water underneath the barriers during injection and upconing of salt water during recovery. To reference this document use: http://resolver.tudelft.nl/uuid:1b2db24a-6df2-4c96-8323-389b4984ad95 DOI https://doi.org/10.1111/gwat.12427 ISSN 0017-467X Source Groundwater, 54 (6), 840-850 Part of collection Institutional Repository Document type journal article Rights © 2016 M. van Ginkel, B.F. des Tombe, T.N. Olsthoorn, M. Bakker Files PDF Ginkel_et_al_2016_Groundwater.pdf 1.73 MB Close viewer /islandora/object/uuid:1b2db24a-6df2-4c96-8323-389b4984ad95/datastream/OBJ/view