Abstract
The objective of this study is to assess groundwater (GW) exploitation status and GW level declines and land subsidence relationship for case studies in Can Tho city and Tra Vinh province. Firstly, GW exploitation for different purposes was compiled and evaluated; GW level declines in upper-middle Pleistocene (qp2-3) at monitoring wells were examined. The land subsidence was calculated using the expression for 1D consolidation of compressible porous media for vertical compaction rates. The results showed that the GW in Pleistocene layer has been the most popular GW exploitation aquifers, for domestic and industrial purposes, and also for agricultural usage. Consequently, GW level in this layer has been found to decline significantly (3.98 m (2001-2014) and 4.06 m (2004-2015) at QT16 (Can Tho), Q217020 (Tra Vinh), respectively). The compaction-based subsidence at these two locations, respectively are 4.383cm and 27.854 cm. It is noticed that the preliminary calculation of compaction-based subsidence from this study inherits hydrogeological parameters from previous studies, and only upper-middle Pleistocene aquifer was considered.
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