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Land subsidence rates of ~ 1–4 cm yr<sup>−1</sup> are measured in the\udlow-lying Vietnamese Mekong Delta. These relatively high subsidence rates are\udattributed to groundwater extraction, which has increased drastically over\udthe past decades due to growing domestic, agricultural and industrial\uddemands. As a result, hydraulic heads in aquifers are dropping, on average\ud0.3–0.7 m yr<sup>−1</sup>. There is an urgent need to go from measurements\udto predictions in order to test possible future groundwater management\udscenarios and to reduce the increase of flood risk, salt water intrusion and,\udon the longer term, prevent the delta from drowning. In this study, we aim to\udassess the subsidence potential of the multi-aquifer subsurface of the Mekong\uddelta due to groundwater extraction. The first step is to gain a thorough\udunderstanding of the complex sedimentary architecture of the heterogeneous\udsubsurface. Combined with the related geotechnical properties, the subsurface\udbuild-up determines the subsidence potential. Here, we present our approach\udto develop a 3-D geo-hydrological model based on lithological borehole data,\udgeophysical sedimentary properties, palaeogeography and conceptual models of\uddelta evolution

Assessing the potential of the multi-aquifer subsurface of the Mekong Delta (Vietnam) for land subsidence due to groundwater extraction