Hydrogeochemistry characteristics and salinity of groundwater in Quaternary sediments in the coastal zone of Ha Tinh province
2015
The coastal zone of Ha Tinh contains three main aquifers in the Quaternary sediments, including the upper Holocene (qh2), lower Holocene (qh1) and Pleistocene (qp). The groundwater is related to three main infiltrate sources of Ca-Na-HCO 3 , Ca-HCO 3 and Mg-HCO 3 type; marine source with Na-Ca-HCO 3 , Na-Ca, Cl-Na-HCO 3 type and mixed source of Na-Ca-HCO 3 , Na-Ca, Cl-Na-HCO 3 type. The relative concentrations of ions in qh1 aquifer and qp aquifer are in the order of (Na + +K + )> Mg 2+ >Ca 2+ and Cl - >HCO 3 - >SO 4 2- . The highly soluble Mg 2+ and Ca 2+ discharged from host rock ,participating in the chemical compositions of the groundwater are much greater than HCO 3 - from rain and surface water having (Ca+Mg)/HCO 3 ratio higher than 0,5. Other less soluble ions in soil and silicate salt have an average (Na + +K + )/total cations ratio about 0.19. The fresh water distributes mainly in qh2 aquifer. The qp aquifer is salinized in an area of about 676 km 2 . The TDS concentrations in the groundwater is increased in dry season as compared to rainy season leading to, decreasing fresh water reservoir in the aquifers strongly effecting the local livelihood activities and socio-economic development. References Nguyễn Kim Cương, 1991: Địa chất thủy văn. Nxb. Khoa học va Kỹ thuật, Ha Nội, 268 trang. Cục Địa chất va Khoang sản Việt Nam, 1997: Bao cao thuyết minh bản đồ nước dưới đất tỉnh Ha Tĩnh tỷ lệ 1:200.000. Nguyễn Văn Đản, Vo Cong Nghiệp, Đặng Hữu Ơn, 1996: Nước dưới đất cac đồng bằng ven biển Bắc Trung Bộ, Ha Nội. Hoang Văn Hưng, 2004: Bản đồ tiềm năng chất lượng nước ngầm toan quốc tỷ lệ 1:1.000.000, Tuyển tập Bao cao HNKH lần thứ 16, Trường Địa học Mỏ - Địa chất. Ha Nội. Đỗ Trọng Sự, 2001: Nghien cứu đặc điểm thủy địa hoa nước dưới đất vung ven biển Bắc bộ va Bắc Trung bộ, Đề an cấp Bộ Cong nghiệp. Fetter C.W., 1993: Applied Hydrogeology, Oshkosh, America. Kim K, 2003: Long-term disturbance of ground water chemistry following well installation. Ground Water 41:780-789. Piper AM, 1944: A graphic procedure in the geochemical interpretation of water-analysis. Trans AM Geophys Union 25:914-923. Sami K, 1992: Recharge mechanisms and geochemical processes in a semi-arid sedimentary basin, Eastern Cape, South Africa. J Hydrology 139:27-48.
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