The use of aero-magnetics to enhance a numerical groundwater model of the Lagan Valley aquifer, Northern Ireland

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Hydrogeophysical model calibration and uncertainty analysis via full integration of PEST/PEST++ and COMSOL

Acknowledgments Andrés González Quirós is the recipient of a Royal Society – Newton International Fellowship (NIF\R1\182210), hosted at the University of Aberdeen. We thank the Scottish Funding Council/Scottish Alliance for Geoscience, Environment and Society for seed funding the development of the project. We would also like to thank the Associate Editor Tim Green, Thomas Hermans, Landon Halloran and one anonymous reviewers for their comments and suggestions in the revision process.Peer reviewedPostprin

Modelling of groundwater recharge in the megacity of Lagos, Nigeria: preliminary results using WetSpass-M

Lagos, Nigeria is one of the World's fastest-growing cities. The increasing water demand has led to depletion and deterioration of the groundwater resources contained in its highly productive coastal aquifers. Groundwater recharge processes and drivers, which dictate groundwater replenishment, and their changes associated with rapid urbanization, are yet to be quantified and understood. We used the spatially distributed WetSpass-M model to estimate the spatiotemporal patterns and rates of recharge between 2000 and 2020 in the 5440 km2 coastal aquifer system underlying the megacity of Lagos. The influence of expanding urban areas, from 807 km2 in 2000 to 1183 km2 in 2020, coincide with reduction in the simulated recharge by 50 % in 20 years. The study also revealed diffuse and focused recharge processes associated with, respectively, the urban centres and areas closer to water bodies signalling strong groundwater-surface water interactions. The preliminary findings from this modelling work provide directions for exploring sustainable water management options including Managed Aquifer Recharge (MAR) in Lagos and other fast-growing coastal megacities in the world.</p

Relative importance of conceptual and computational errors when delineating saltwater intrusion from resistivity inverse models in heterogeneous coastal aquifers

Acknowledgments: Andrés González Quirós is the recipient of a Royal Society – Newton International Fellowship (NIF\R1\182210), hosted at the University of Aberdeen. We thank two anonymous reviewers for their constructive comments, which contributed to improve the manuscriptPeer reviewedPostprin

Using stable water isotopes to identify spatial-temporal controls on groundwater recharge in two contrasting East African aquifer systems

We appreciate the financial support granted by the Royal Geography Society (with IBG), the Kenya Water Resources Management Authority (WRMA) and the University of Aberdeen. WRMA staff who assisted during groundwater sampling and J. Dick’s assistance in running isotope laboratory tests are greatly acknowledged. We are grateful to two anonymous reviewers for their relevant comments and suggestions which have contributed to improve the manuscript.Peer reviewedPostprin

Drivers, patterns and velocity of saltwater intrusion in a stressed aquifer of the East African coast : Joint analysis of groundwater and geophysical data in southern Kenya

We acknowledge the Royal Geographical Society (with IBG) Environment and Sustainability Research Grant for financial support for all field activities. Acknowledgments extend to the Kenyan Water Resources Authority (WRA) and the University of Aberdeen for supporting S. Oiro’s PhD scholarship. We thank Security Officers and Government of Kenya Administrators who facilitated field access by informing the public of our presence in the area as well as the assistance by local casuals during the geophysical surveys.Peer reviewedPostprin

Depletion of groundwater resources under rapid urbanisation in Africa : recent and future trends in the Nairobi Aquifer System, Kenya

Open Access via the Springer Compact Agreement Acknowledgements: We acknowledge the Royal Geographical Society (with IBG) Environment and Sustainability Research Grant for supporting the fieldwork activities, and The World Bank/Aurecon AMEI Limited for supporting model scenarios simulations. We are also grateful to the Kenyan Water Resources Authority (WRA) and the University of Aberdeen for jointly supporting Samson Oiro’s PhD scholarship. We warmly thank WRA staff involved in data compilation and acquisition as well as the WRA offices (Nairobi and Kiambu Office) for providing the borehole completion reports and abstraction records. We thank three reviewers for their constructive comments which contributed to improve the final manuscript.Peer reviewedPublisher PD

Laboratory measurements of zeta potential in fractured Lewisian gneiss : implications for the characterization of flow in fractured crystalline bedrock

Funding: This research received no external funding. Acknowledgments: Miftah Hidayat was supported by the Aberdeen-Curtin PhD studentship. Yogen- dra Kumar was supported by a scholarship from the Government of India. Chandrakant Jadhav from the Department of Physics and John Still from the School of Geoscience, University of Aberdeen are acknowledged for their assistance in processing the XRD and SEM data. David Healy acknowledges funding from UKRI NERC grant NE/N003063/1.Peer reviewedPublisher PD

Effect of surface water level fluctuations on the performance of near-bank managed aquifer recharge from injection wells

Funding: This research was supported by the National Natural Science Foundation of China (42102286, U1803241, 51779230), the Belt and Road Special Foundation of the State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering (Nanjing Hydraulic Research Institute. Grant 2020nkms05), the Open Project Program of Key Laboratory of Groundwater Resources and Environment (Jilin University), Ministry of Education (Grant No. 202105002KF), and the Natural Resources Science and Technology Project of Henan Province in 2020 (Henan Natural Resources Han [2020] No. 542-7), providing financial support for the collection of data, their analysis and the writing and publication of the results Acknowledgments: The authors acknowledge valuable comments from the reviewers, which led to significant improvement of the paper.Peer reviewedPublisher PD

Quantification of groundwater storage heterogeneity in weathered/fractured basement rock aquifers using electrical resistivity tomography : sensitivity and uncertainty associated with petrophysical modelling

Acknowledgments: We thank the National Council of Science and Technology and Secretariat of Energy of México (CONACYT-SENER) for funding this research, and the Geological Survey of Ireland and MSc students at Queen’s University of Belfast for assistance in data collection. We appreciate the insightful and constructive comment by P. Lachassagne and two anonymous reviewers which contributed to improve the manuscript.Peer reviewedPostprin