Paleo-climatic control on recharge and fresh-salt groundwater distribution in the Red River delta plain, Vietnam.

ABSTRACT: Paleo-climatic induced sedimentation controls present-day recharge and the fresh-salt groundwater distribution in Quaternary delta systems. During sea-level highstands, marine clays with saline pore water were deposited and are interbedded with aquifers of coarse-grained sandy fluvial and shallow marine deposits, laid down during lowstands. The low-permeable marine layers may inhibit recent recharge to deeper aquifers, and thereby limit sustainable use of these freshwater resources. This phenomenon has been investigated in the Red River delta plain, using geophysical borehole logging, transient electromagnetic soundings, groundwater chemistry, stable isotope analysis and ³H and ¹⁴C dating of groundwater. Results reveal that marine saline pore water is still present in

SUBMITTER: Larsen F 

PROVIDER: S-EPMC11391079 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature