19/02/2024 3:30 PM GMT+7 TP HCM
IJL CARE is proud to announce the PhD thesis defense of Thanh TRUONG QUOC, PhD granted by "ARTS" grant from IRD It will be held in Grenoble, France, next February, Thursday 22th, at 15:00 Vietnam Time, 09:00 French Time
Visio conference link: https://univ-grenoble-alpes-fr.zoom.us/j/2072936735
We are looking forward your participation ! With my best regards
Marc
The jury will be composed of: Marc DESCLOITRES, University Grenoble Alpes, Thesis Director Colette SIRIEIX, University of Bordeaux, Rapporteure Konstantinos CHALIKAKIS, Avignon University, Rapporteur Nhan Quy PHAM, Hanoi University of Natural Resources and Environment, Rapporteur Dan NGUYEN PHUOC, Ho Chi Minh City University of Technology, Examiner Laurent OXARANGO, IGE University Grenoble Alpes, Examiner Phong Tan NGO, Ho Chi Minh City University of Technology, Co-supervisor, invited
GEOPHYSICAL INVESTIGATION OF THE SHALLOW AQUIFER AND ITS VULNERABILITY IN THE CU CHI RURAL DISTRICT, HOCHIMINH CITY REGION, VIETNAM
Ho Chi Minh City (HCMC) region in the south of Vietnam faces significant challenges from climate change and subsidence, with more frequent flooding, and threat of saltwater intrusion. As a proactive measure for future mitigation and development, particular attention is being paid towards sustainable groundwater resources. The northwest, characterized by high terrain and identified as the regional recharge area, is earmarked as a potential crucial groundwater reserve for the future.
The primary objective of this research is to understand better shallow groundwater resources and their vulnerability to human practices. The second objective is to evaluate several geophysical methods for hydrogeology in the sedimentary geological context of the Saigon River area. An extensive geophysical field investigation was conducted using Time-Domain Electromagnetic (TDEM), Frequency Electromagnetic (FEM), and Electrical Resistivity Tomography (ERT) methods, being evaluated for their sensitivity to clayey layer detection using numerical modeling prior to the survey. These methods proved effective in characterizing the geometry of the aquifer and aquitard system to a depth of 150 meters for TDEM method, very sensitive to electrically conductive clayey layers. The research revealed that the absence of a surface clay layer thus facilitates groundwater recharge, posing a risk of surface pollutants easily infiltrating the aquifer. Moreover, deeper clay layers are discontinuous, increasing the vulnerability to the downward spread of contaminants. The research also points towards a new conceptual model of the aquifer involving geological transgression-regressions scenarios to explain the spatial distribution of the clayey aquitards, showing meanders and floodplains of the ancient Saigon River at depth.
Innovatively, the Nuclear Magnetic Resonance (NMR) method was also employed at the laboratory scale to classify the aquifer using core extracted from boreholes tests. Coupled with grain size analysis, the results show that the shallow aquifer is fine-grained. As field-scale NMR was unsuccessfully applied due to high noise conditions, analyses with pumping and tracer tests gave additional data, leading to the conclusion that NMR results are still preliminary as several improvements have to be made regarding noise reduction and specific yield determination.
For the future, the research paves the way for constructing 3D hydrodynamic models for sustainable exploitation. Vadose zone models will also facilitate the evaluation of pollution in the water table. Finally, this research highlights the efficiency of resistivity-based geophysical methods for sedimentary shallow aquifers characterization in Saigon River and HCMC regions. Combined with hydrogeological methods, future geophysical studies will help to address future groundwater challenges and contribute to the south of Vietnam’s resilience against climate change impacts.
On 22/10/2015, CARE has organized the meeting of the Scientific Council with the chairmanship of Dr. Nicolas Gratiot - Director and Chairman of the Scientific Council, Assoc. Pro. Vo Le Phu (on behalf of Assoc. Pro. Nguyen Phuoc Dan - Deputy Chairman)
22/10/2015
Project description The availability of High Resolution Imagery (spatial, spectral, and radiometric) with an increased time revisit (Landsat-8 and now Sentinel-2) opens the way to a more detailed observation of coastal zones and inland waters (large rivers, lakes and reservoirs)
26/02/2016
On 08 September 2016, the delegation from Institute of Research for Development (IRD – France) led by Mr. Thierry Lebel - Director of the Promotion of Interdisciplinary and Intersectoriality and Mr. Frédéric Ménard
02/09/2016
The pretty work, a monography collection of 15 megacities in the world about "Water, megacities and Global Change”, has been published by UNESCO. The CARE Lab-HCMUT Researchers are honored to represent Ho Chi Minh City by contributing an article
11/10/2016
CARE Lab-HCMUT is pleased to present you our publication of the monography "Ho Chi Minh City growing with water-related challenges".
31/10/2016
CARE Lab-HCMUT and PADDI, a member of the Ho Chi Minh City delegation, participated in the 26th Environment exhibition POLLUTEC, Lyon (France), which took place from 30/11 to 02/12/2016.
22/12/2016
Tuteur: Dr. BUI Xuan ThanhAssociate Professor in Environmental Engineering,Head, Department of Water Science & Technology Faculty of Environment & Natural Resources
11/01/2017
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