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Deep Ground‐Water Investigation by Combined VES/MTS Methods Near Ho Chi Minh City, Viet Nam
Author(s) -
Pham Ngoc,
Boyer Daniele,
Thoa Nguyen Thi Kim,
Nguyen Giang
Publication year - 1994
Publication title -
groundwater
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.84
H-Index - 94
eISSN - 1745-6584
pISSN - 0017-467X
DOI - 10.1111/j.1745-6584.1994.tb00904.x
Subject(s) - geology , quaternary , aquifer , alluvium , groundwater , geomorphology , tectonics , basement , geochemistry , paleontology , archaeology , geography , geotechnical engineering
In the agglomeration of Ho Chi Minh City (HCMC), South Viet Nam, located near the eastern edge of the Mekong Delta, both superficial Quaternary and deep Tertiary Alluvium may contain brackish or saline water from ground surface to great depths. The combination of two complementary geophysical methods, the Vertical Electrical Sounding (VES) for shallow investigation, and the Magnetotelluric Sounding (MTS) for deep investigation, gives a more complete electrical image of the sedimentary series from the surface to the deep crystalline basement. It turned out to be very efficient in delineating the ground‐water contamination in both superficial and deep aquifers. The combined results reveal a close correlation of the extent of the contamination with the paleo‐geomorphology of laterites, and subsequently with the paleorelief during the Tertiary and Quaternary periods. A simple guide for hydrogeological investigation is proposed in connection with the present topography and the Tertiary tectonics.