Assessment of Groundwater Quality in Quaternary Sediments of Da Nang City in the Period 2000- 2017

Trinh Nguyen Dieu¹, Hoang Thanh Son², and Nguyen Bach Thao³

1. Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Vietnam

2.Institute of Geography, Vietnam Academy of Science and Technology, Vietnam

3. Hanoi University of Mining and Geology, Vietnam

Abstract: Groundwater in Quaternary sediments of Da Nang city has been saline, the area of saline water is increasing. Salt water (total mineralization > 1 g/l) is distributed along big rivers such as Han River, Cam Le River, Vinh Dien River, Cau Do River and Cu De Rive in Holocene and Pleistocene aquifers. Freshwater, with the water mineralization of less than 1 g/l, widely distributed in the study area, was previously contaminated by Fe but now it is polluted by ammonium at some places in Hoa Hiep Bac ward (Lien Chieu district) and some places in Ngu Hanh Son district in the aquifers of Holocene and Pleistocene, polluted by nitrite in Cam Ne village, Hoa Tien commune (Hoa Vang district) in the Pleistocene aquifer, and polluted by Fe in Hoa Lien commune (Hoa Vang district) and at some places in Ngu Hanh Son district in the Holocene and Pleistocene aquifers.

Key words: groundwater, Da Nang, fluctuations, quality