ĐÁNH GIÁ BIẾN ĐỘNG CÂN BẰNG NƯỚC DƯỚI ĐẤT TẠI CÁC TẦNG CHỨA NƯỚC HOLOCEN VÀ PLEISTOCEN TRONG TRẦM TÍCH ĐỆ TỨ LƯU VỰC SÔNG NHUỆ - ĐÁY

Abstract

Systematizing groundwater balance is a part of groundwater resource management in
particular and water resource management in general. In this study, fluctuations in groundwater balance in the porous aquifers in Quaternary sediments in Nhue - Day river basin were carried out to evaluate the change between the amount of water added and the amount of water drained over time in different areas. For this purpose, data on groundwater elevation over time at national water resources monitoring works and hydrogeological parameters of aquifers are collected and analyzed. Isometric maps of underground water levels in Holocene (qh), Pleistocene (qp) hole aquifers over time and isometric maps of water conductivity, release coefficient and thickness of each aquifer water was built using GIS software. Using the data of the built maps, the water balance of the two aquifers qh and qp according to the average time of the months in 2022 in the Nhue Day river basin is calculated by the Darcy method by using the method of Darcy. Darcy Flow tool in Arcgis software. The results of determining the fluctuation of groundwater balance have determined that the aquifer qh is replenished, ranging from 1,911 m³/day to 3,428 m³/day, with an average of 2,580 m³/day; The added qp aquifer ranged from 33,401 m³/day to 36,319 m³/day, with an average of 34,722 m³/day.