Terrestrial water load and groundwater fluctuation in the Bengal Basin
MetadataShow full item record
Groundwater-level fluctuations represent hydraulic responses to changes in groundwater storage due to aquifer recharge and drainage as well as to changes in stress that include water mass loading and unloading above the aquifer surface. The latter 'poroelastic' response of confined aquifers is a well-established phenomenon which has been demonstrated in diverse hydrogeological environments but is frequently ignored in assessments of groundwater resources. Here we present high-frequency groundwater measurements over a twelve-month period from the tropical, fluvio-deltaic Bengal Aquifer System (BAS) , the largest aquifer in south Asia. The groundwater level fluctuations are dominated by the aquifer poroelastic response to changes in terrestrial water loading by processes acting over periods ranging from hours to months; the effects of groundwater flow are subordinate. Our measurements represent the first direct, quantitative identification of loading effects on groundwater levels in the BAS. Our analysis highlights the potential limitations of hydrogeological analyses which ignore loading effects in this environment. We also demonstrate the potential for employing poroelastic responses in the BAS and across other tropical fluvio-deltaic regions as a direct, in-situ measure of changes in terrestrial water storage to complement analyses from the Gravity and Climate Experiment (GRACE) mission but at much higher resolution.
Showing items related by title, author, creator and subject.
Budihardjo, Mochamad Arief; Chegenizadeh, Amin; Nikraz, Hamid (2014)Background: In general, the aquifer may contain a combination of different soil types. Response of the aquifer toward the changes of ground water level due to groundwater extraction depends on the characteristics of the ...
Hydrogeological characterisation of groundwater over Brazil using remotely sensed and model productsHu, K.; Awange, Joseph; Khandu; Forootan, E.; Goncalves, R.; Fleming, K. (2017)For Brazil, a country frequented by droughts and whose rural inhabitants largely depend on groundwater, reliance on isotope for its monitoring, though accurate, is expensive and limited in spatial coverage. We exploit ...
Hydrogeology of the Lake Muir–Unicup Catchment, Western Australia: an ecologically important area experiencing hydrologic changeSmith, Margaret G (2010)Identified in the Western Australian Government’s 1996 Salinity Action Plan as an important natural diversity area at risk from changing hydrology, the Lake Muir– Unicup Natural Diversity Catchment is in need of urgent ...