Nguyen Thi Thai, HUS email:
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| Title of Master Project:
Organic matter degradation in aquifer sediments and the arsenic content of the groundwater
Project objective and activities:
To investigate the rate of organic matter degradation in aquifer sediments as the controlling factor for the arsenic and ammonia contents of the groundwater. For this purpose a radiotracer method will be implemented to measure the rates of methanogenesis through the reduction of CO2 and the fermentation of acetate. The method will be applied on sediments in the Dan Phuong area and the results will be compared with the groundwater arsenic content.
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Dao Manh Phu, HUS email:
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| Title of Master Project:
Seasonal variation of chemical species and arsenic contamination in groundwater. Case study at Danphuong, Hanoi
Project objective and activities:
To investigate the fluctuation of arsenic related chemical species in groundwater in order to have better understanding of arsenic release in groundwater and of surface water influence. For this purpose a series of sampling and chemical analysing (EC, Fe, Mn, NH4+, CH4, PO43-, etc.) will be implemented in one year to measure the variation of arsenic and other related elements. The method will be applied on groundwater in the Dan Phuong area.
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| Do Cao Cuong, HUMG email:
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| Title of Master Project:
The Hydraulic controls of groundwater arsenic concentrations in a pristine Pleistocene aquifer in the Red River delta plain, Vietnam.
Project objective and activities:
The objective of the MSc project is the study the hydraulic controls of groundwater arsenic concentrations in a pristine Pleistocene aquifer, overlain by fluvial Holocene sediments with high arsenic groundwater concentrations. A field study will be undertaken in a 10 km long transect from the recharge area near the mountains to the discharge area near the Red River in the central part of the Red River plain. The interaction between the Holocene and the Pleistocene aquifers will be studied using the stable composition of the water (18O/16O and 2H/1H), estimation of residence times and mixing ratios in the Pleistocene aquifer. The groundwater flow will be simulated with the numerical code MODFLOW.
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| DANG Tran Trung, HUMG email:
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| Title of Master Project:
The Hydraulic controls of groundwater arsenic concentrations in a pumped Pleistocene aquifer in the Red River delta plain, Vietnam.
Project objective and activities:
The objective of the MSc project is the study the hydraulic controls of groundwater arsenic concentrations in a heavily pumped Pleistocene aquifer, overlain by fluvial Holocene sediments with high groundwater concentrations of arsenic, in the Hanoi area. A field study will be undertaken in a 10 km long transect in the Hanoi area, from the well field Nam Du, close to the Red River, to the the well field Da Dinh. The interaction between the Holocene and the Pleistocene aquifers will be studied using the stable composition of the water (18O/16O and 2H/1H), estimation of residence times and mixing ratios in the Pleistocene aquifer. The groundwater flow will be simulated with the numerical code MODFLOW.
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TRAN Vu Long (Professor), HUMG email:
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| Title of Master Project:
Intrusion mechanisms of saltwater into a multi-layer coastal aquifer system in the Red River Plain, Nam Dinh, Vietnam.
Project objective and activities:
The objectives of the MSc project are to map the distribution of saltwater in the Holocene and Pleistocene aquifers in the coastal zone of Nam Dinh and to study the mechanisms of intrusion of saltwater into the aquifers. Special emphasize will be on the dymamic hydraulic interactions between the Red River and the multi-layered aquifer system. The mapping of the the salt water distribution will be done with the use of geophysical borehole logging and transient electromagnetic soundings (TEM). The groundwater flow will be done with the numerical code SUTRA.
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Vu, Van Hung, HUMG email:
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| Title of Master Project:
Modelling of the flushing mechanisms of saltwater in Quaternary sediments on a geological time scale in the Red River Plain, Vietnam.
Project activities and objectives.
The main objective of the M.Sc. project is to study the flushing mechanisms, on a geological time scale, of paleo-saltwater from the sediments in the Red River delta plain. The mechanism of flusing, such as density flow in high permeable layers and diffusive transport in low permeable layers, will be studied in 2D conceptual model scenarios
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| Bui Trung Quan, HUS e-mail:
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| Title of Master Project:
Interaction between groundwater and river water and its effect on arsenic cycling.
Project activities and objectives.
To increase our understanding of the chemical interactions between groundwater and river water. To carry out detailed profiling of water chemistry, using a mini drive-point piezometer in two situations 1) during the initial stages of flooding when the water level in the channels is higher than in the aquifer and therefore there is a flux of water entering the aquifer. 2) during the dry season when the water level in the aquifer is higher than in the channels and groundwater is discharging into the channels. A sediment core will be taken during the dry season and be analysed for Fe and As. The site of investigations is near DanPhuong at the K-transect. The transect consists of about 50 borings and the change in water chemistry over the seasons has been investigated in Phase 1. The aquifer sand outcrops near the channels and this is where the detailed profiles should be carried out.
The work should be coordinated with HUMG for measuring the pressure heads in channel and aquifer and to measure the water fluxes using seepage meters. Also samples for stable isotopes of oxygen and hydrogen should be taken when sampling for water chemistry is done. |
| Cao Thi Mai Trang, HUS e-mail:
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| Title of Master Project:
Flushing of arsenic from Holocene aquifer sediments.
Project activities and objectives.
To improve our understanding of desorption processes controlling arsenic release from Holocene sediments. Field studies will be carried out at Nam Du where a well field close to the Red River causes the infiltration of arsenic free river water into the Holocene aquifer. Eleven short screen boreholes have already been established towards this purpose. As a supplement high resolution profiles from the uppermost meters will be sampled using a drive point piezometer. Sediment cores will be taken to analyse the amounts of adsorbed arsenic and phosphate as well as the amounts of iron oxide and organic carbon present in the sediment. Work should be carried out in cooperation with students from HUMG in order to quantify the flux of water entering the aquifer. |
| Nguyen Nhu Khue, HUS e-mail:
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| Title of Master Project:
Flushing of arsenic from Pleistocene aquifer sediments.
Project activities and objectives.
To improve our knowledge concerning the processes of arsenic adsorption to Pleistocene aquifer sediments:
At the field site at Nam Du, and near boring T2 at the Dan Phuong, filters will be installed that allow us to follow the change in water chemistry as the groundwater from the high arsenic Holocene aquifer enters the underlying Pleistocene aquifer. The waters will be analysed for their bulk chemical composition as well as for arsenic speciated as As(III) and As(V). Sediment cores will be taken from the upper Pleistocene sediment and analysed for their contents of iron oxides and the concentrations of adsorbed arsenic and phosphate. The work should be carried out in cooperation with students from HUMG in order to quantify the flow of water going from the Holocene to the Pleistocene aquifer. |
| Nguyen Thi Thu Trang, HUS e-mail:
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| Title of Master Project:
Mobilization processes of arsenic in a Red River aquifer with emphasis on the role of organic matter.
Project activities and objectives.
The overall objective is to obtain a better understanding of the release of arsenic from aquifer sediments in relation to organic matter degradation and the resulting chemical composition of the groundwater. A transect of 4 localities with piezometers at different depth levels will be established going from the Dan Phuong field site to the mountains. At each site, samples of groundwater will be taken at various depth levels and analysed for their bulk chemical composition as well as for arsenic. Dissolved arsenic will be speciated into As(III) and As(V). Sediment cores will be taken at selected depth intervals and be analysed for organic carbon and total carbon. The results of organic matter analyses will be compared with rate measurements for methanogenesis and be used to analyse the controlling mechanisms for arsenic mobilization. The results will be incorporated in a reactive transport model to analyse the geochemical processes proceeding along the flow path. |
| Hoang Thi Tuoi, HUS e-mail:
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| Title of Master Project:
Mobilization processes of arsenic in a Red River aquifer with emphasis on the role of iron oxides.
Project activities and objectives.
The overall objective is to obtain a better understanding of the release of arsenic from aquifer sediments under anoxic conditions and the role of arsenic containing iron oxides in the process. A transect of 4 localities with piezometers at different depth levels will be established going from the Dan Phuong field site to the mountains. At each site, samples of groundwater will be taken at various depth levels and analysed for their bulk chemical composition as well as for arsenic. Dissolved arsenic will be speciated into As(III) and As(V). Sediment cores will be taken at selected depth intervals and be analysed for extractable As, Fe and PO4. Geochemical modelling will be used to calculate the saturation state of the groundwater for different minerals and, together with results from rate measurements, be used to analyse the controlling mechanisms for arsenic mobilization. Reactive transport modelling will be used to analyse the geochemical processes proceeding along the flow path. |
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