HYDRO-GEOPHYSICS TRAINING SCHOOL 2018

HYDRO-GEOPHYSICS TRAINING SCHOOL 2018 

9-14 april 2018 

HCM University of Technology

CARE laboratory, Ho Chi Minh City VIETNAM

Project report « LABEX International OSUG@2020

     From April 9 to April 14, 2018, CARE laboratory held the first training school on Hydrogeophysics which is the domain of geophysics applied to groundwater investigation. Around 25 students from the faculty of geology and the faculty of Environmental Resources of HCM University of Technology attended an intensive course of 6 full days focusing on one of the main geophysical method applied to hydrological and hydrogeological problems that could be applied in Vietnam: resistivity methods (Direct Current -DC and Electromagnetic -EM) which are one of the most appropriate parameter for hydrogeological problems (coastal aquifers, salt water intrusion, hard rock and sedimentary aquifers) within the range 0-50 to 100 m deep. They used Electrical Resistivity Tomography (ERT) and Time Domain (TDEM) techniques during the field training.

Funding

The training school was co-supported by the LABEX OSUG@2020 project, the HCMUT University (lunches, bus for field trip and CARE Laboratory.

Principal organizers

• Tran Anh Tu, Dr.Eng. Vice Dean, Faculty of Geology & Petroleum Engineering, Ho Chi Minh City University of Technology.
• Marc Descloitres, IGE-IRD, lecturer for the training school, senior geophysicist
• Phan Thi San Ha, former head of CARE Lab.
• Nicolas Gratiot, co-head of CARE Lab.
• Supporting staffs: Le Thanh Phong, Truong Quoc Thanh

Class room work

The class room work was oriented to practice of the resistivity software for typical geological situations as well as an introduction to the Time Domain Electromagnetic method.  

Fieldwork 

For the fieldwork, we surveyed during 2 days a test site located in Ben Tre province, using electrical tomography (2 profiles) and 24 TDEM soundings. This site is characterized by clayey and salty aquifers close to the surface. The objective was to detect the salty aquifer but also a deeper aquifer (30-50 meters deep) with fresh water. This objective was reached using the TDEM method, which was able to detect a more resistive layer below 30 m. The resistivity of this layer should be confirmed using larger TDEM loop in the future.  

Future works for 2019 

For 2019, if funding are available, we could organized another training school focusing on other geophysical methods for quantifying groundwater resources, such as Magnetic Resonance Sounding

Student list