Groundwater dynamics in the Vietnamese Mekong Delta: Trends, memory effects, and response times

نویسندگان

چکیده

Vietnamese Mekong Delta. This study investigates the trends of groundwater levels (GWLs), memory effect alluvial aquifers, and response times between surface water across Delta (VMD). Trend analysis, auto- cross-correlation, time-series decomposition were applied within a moving window approach to examine non-stationary behavior. Our revealed an effective connection shallowest aquifer unit (Holocene) water, high potential for shallow recharge. However, low-permeable aquicludes separating aquifers behave as low-pass filters that reduce high?frequency signals in GWL variations, limit recharge deep groundwater. Declining GWLs (0.01?0.55 m/year) detected all throughout 22 years observation, indicating abstraction exceeds Stronger declining deeper The dynamic trend analysis indicates decrease accelerated continuously. varied according geographical location, being shorter flood-prone areas longer coastal areas. Variation time river was controlled by depth season. during flood season, bulk occurred late particularly aquifers.

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ژورنال

عنوان ژورنال: Journal of Hydrology: Regional Studies

سال: 2021

ISSN: ['2214-5818']

DOI: https://doi.org/10.1016/j.ejrh.2020.100746