HYDROGEOPHYSICS TECHNIQUES TO AQUIFER LOCATING AND MONITORING FOR INDUSTRIAL ZONE NORTH THANGLONG AND QUANGMINH, HANOI

Abstract

Geophysical  methods  were  applied  for  hydrogeological  targets  in  many  countries  including  Vietnam.  This  paper resents  results  of  using  complex  geophysical  techniques  as  well  as  2D  electrical  resistivity  imaging  (ERI),  vertical electrical  sounding  (VES),  very  low  frequency  (VLF)  and  seismic  refraction  for  geological  structure  investigation  to aquifers locate and to assess of hydrogeological condition for groundwater potential in North Thanglong and Quangminh industrial zones, Hanoi, Vietnam. The locations of two aquifers are determined by their depth and thickness on the basis
of resistivity and seismic velocity values which were proved by stratifications of three boreholes to 40-60m of depth on study area. There are connecting from surface water to shallow aquifer by hydraulic windows from VLF data. The deeper aquifer can be considered as potential groundwater for supplying in the area. Groundwater level, electrical conductivity and  water  temperature  were  measured  in  six  monitoring  wells,  complemented  by  anion,  cation  and  stable  isotope analyses of ground and surface water. This study also reviews, compiles and comprehensively analyzes spatiotemporal variations of hydrological and hydrogeological characteristics of shallow and deep groundwater aquifers in area and in nearby Red River water. The results show that groundwater in both shallow and deep aquifers was fresh, but mainly calcium-bicarbonate type. With the goal of devising sustainable water use regulations, more research must be directed toward long-term monitoring of groundwater and surface water quality, as well as toward detailed investigation of the hydraulic characteristics of local aquifers in the study area.

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