SUMMARY
Some new results of study on
the salt water boundary in the
according to materials of electric sounding and borehole logging
Bùi Tiến Bình
Geophysical logging and vertical electrical sounding methods play an important role in the study on groundwater salinity boundaries in the Nam Bộ Delta. There are now over 13,000 electrical sounding points and nearly 800 geophysical logging boreholes that were realized in different areas of research projects in the whole Nam Bộ Delta with the main objective of determining the distribution of the saline boundary in aquifers of this region.
Geoelectrical standards fixing the saline boundary in aquifers were determined by the correlation between the value of resistivity of underground environment and the total mineralization of groundwater. However, recent studies on the aspects of geology, hydrogeology, geophysics, etc. at the map of from medium to large scale in different areas of the Nam Bộ Delta indicated that the current standards are no longer appropriate.
The article gives some examples in recent studies carried out in the Nam Bộ Plain region aiming to compare with the saltwater boundaries that were determined some years ago in an overall study project at 1:500,000 scale [6] and explains about the need to rebuild in accordance to current standards, since then, proposes a new model of saltwater lines in a larger scale, consistent with the objectives of the investigation and planning of groundwater resources in the Nam Bộ Plain region in the coming years.
Người biên
tập: Nguyễn Tuấn Phong