Hydrogeological typologies of the Indo-Gangetic basin alluvial aquifer,South Asia |
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| Authors: | H C Bonsor A M MacDonald K M Ahmed W G Burgess M Basharat R C Calow A Dixit S S D Foster K Gopal D J Lapworth M Moench A Mukherjee M S Rao M Shamsudduha L Smith R G Taylor J Tucker F van Steenbergen S K Yadav A Zahid |
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| Institution: | 1.British Geological Survey,Lyell Centre,Edinburgh,UK;2.Department of Geology,University of Dhaka,Dhaka,Bangladesh;3.Department of Earth Sciences,University College London,London,UK;4.International Waterlogging and Salinity Research Institute (IWASRI), Water and Power Development Authority,Lahore,Pakistan;5.Overseas Development Institute,London,UK;6.Institute for Social and Environmental Transition‐Nepal,Kathmandu,Nepal;7.Global Water Partnership,Oxford,UK;8.National Institute of Hydrology,Roorkee,India;9.British Geological Survey,Wallingford,UK;10.Institute for Social and Environmental Transition‐International,Boulder,USA;11.Department of Geology and Geophysics,Indian Institute of Technology,Kharagpur,India;12.Institute for Risk and Disaster Reduction,University College London,London,UK;13.Filters for Families,Wheat Ridge,USA;14.Department of Geography,University College London,London,UK;15.MetaMeta Research,Hertogenbosch,The Netherlands;16.Ground Water Hydrology,Bangladesh Water Development Board,Dhaka,Bangladesh |
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| Abstract: | The Indo-Gangetic aquifer is one of the world’s most important transboundary water resources, and the most heavily exploited aquifer in the world. To better understand the aquifer system, typologies have been characterized for the aquifer, which integrate existing datasets across the Indo-Gangetic catchment basin at a transboundary scale for the first time, and provide an alternative conceptualization of this aquifer system. Traditionally considered and mapped as a single homogenous aquifer of comparable aquifer properties and groundwater resource at a transboundary scale, the typologies illuminate significant spatial differences in recharge, permeability, storage, and groundwater chemistry across the aquifer system at this transboundary scale. These changes are shown to be systematic, concurrent with large-scale changes in sedimentology of the Pleistocene and Holocene alluvial aquifer, climate, and recent irrigation practices. Seven typologies of the aquifer are presented, each having a distinct set of challenges and opportunities for groundwater development and a different resilience to abstraction and climate change. The seven typologies are: (1) the piedmont margin, (2) the Upper Indus and Upper-Mid Ganges, (3) the Lower Ganges and Mid Brahmaputra, (4) the fluvially influenced deltaic area of the Bengal Basin, (5) the Middle Indus and Upper Ganges, (6) the Lower Indus, and (7) the marine-influenced deltaic areas. |
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