Characteristics of hydrochemical and d2H, d18O stable isotopic composition to study saltwater intrusion in coastal aquifers in Danang city

T. Nguyen, N. D. Dang, Bang Duc Dao
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Abstract

The situation of saltwater intrusion in coastal aquifers in Da Nang city is greatly affected by urban planning, exploitation and water resources use. This article presents research data on hydrogeochemical characteristics and stable isotope composition, thereby determining the origin of groundwater in aquifers then study on saltwater intrusion. The relationship between δ2H and δ18O during rainy season shows that the water in the Holocene aquifer in Da Nang coastal area has isotopic composition similar to regional meteorological water and does not mix with seawater, the main source recharges to the aquifer is rainwater. During dry season, d18O in groundwater is low but d2H is enriched by recharged rainwater from higher attitude area and also affected by exchange with leakage water from landfills. The saline water in this aquifer tends to be washed by rainwater leading to the phenomenon of paleness and the area of salt water in the aquifer is gradually shrinking. These research results are very important in propose a solution for ground water extraction plan and control saltwater intrusion for groundwater
岘港市沿海含水层水化学特征及d2H、d18O稳定同位素组成研究
岘港市沿海含水层海水入侵状况受城市规划、开发和水资源利用的影响较大。本文介绍了水文地球化学特征和稳定同位素组成的研究资料,从而确定了含水层地下水的来源,并对咸水入侵进行了研究。雨季δ2H和δ18O的关系表明,岘港沿海地区全新世含水层水同位素组成与区域气象水相似,不与海水混合,补给含水层的主要来源是雨水。在旱季,地下水中的d18O含量较低,但d2H被高海拔地区的雨水补给而富集,并受到与垃圾填埋场渗漏水交换的影响。该含水层的咸水容易被雨水冲刷,形成淡色现象,含水层的咸水面积逐渐缩小。这些研究成果对制定地下水抽采方案和控制地下水盐水入侵具有重要意义
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