Japan Geoscience Union Meeting 2015

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Oral

Symbol A (Atmospheric and Hydrospheric Sciences) » A-HW Hydrology & Water Environment

[A-HW26] Hydrological Cycle and Water Environment

Wed. May 27, 2015 9:00 AM - 10:45 AM 301A (3F)

Convener:*Youhei Uchida(Geological Survey of Japan, AIST), Atsushi Higuchi(Center for Environmental Remote Sensing (CEReS), Chiba University, Japan), Seiya Nagao(Institute of Nature and Environmental Technology, Kanazawa University), Takeshi Hayashi(Faculty of Education and Human Studies, Akita University), Chair:Youhei Uchida(Geological Survey of Japan, AIST), Seiya Nagao(Institute of Nature and Environmental Technology, Kanazawa University), Atsushi Higuchi(Center for Environmental Remote Sensing (CEReS), Chiba University, Japan), Takeshi Hayashi(秋田大学教育文化学部)

10:33 AM - 10:36 AM

[AHW26-P03] Hydrological Environment of Surface Water and Groundwater in Ninh Thuan Region, South-east Coast, Vietnam

3-min talk in an oral session

*Anh hoang LE1, Maki TSUJIMURA1, Huyen t.t. NGUYEN2, Tuyen N. PHAN2 (1.Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Ten-noudai, Tsukuba, 2.Institute of Energy, 6 Ton That Tung, Khuong Thuong ward, Dong Da district, Hanoi, Vietnam)

Keywords:nuclear power plant, environmental impact assessment, water resources

The Government of Vietnam is planning to construct two nuclear power plants in Ninh Thuan province, a coastal region of Vietnam with semi-arid climate conditions. This research aims to investigate the hydrological environment of surface water and groundwater in the planned site of Ninh Thuan 2 in order to obtain basic information for the construction of the plant. Inorganic solute ion concentrations and stable isotopes of oxygen and hydrogen in surface water, groundwater and seawater were analyzed to understand their chemical characteristics and hydrological process. The results demonstrate that water resources in this region are limited and groundwater is considered to be a main water source. The groundwater flows in Holocene and Pleistocene aquifers, with the depths of 10 m and 16-21 m, respectively and the dominant flow is from southwest to northeast, corresponding to the river flow direction in this area. There seems to be an interaction of surface water and groundwater in this region. Streams and wells near the shoreline are affected by brackish water with high Na-Cl concentration. Groundwater in the Holocene aquifer shows a chemical characteristic of Ca-SO4 and Ca-HCO3 type, whereas Na-HCO3 water type is dominant in the Pleistocene aquifer. The water chemistry is being influenced by freshwater - brackish water mixing, weathering processes and human activities. The nitrate concentration of groundwater in the Holocene aquifer is higher than that in the Pleistocene aquifer, and much higher than WHO drinking water standards. This means that water in this region is affected by agricultural production activities. Therefore, the project developer should have a careful consideration when consuming water in this region for Ninh Thuan 2 nuclear power plant project.