利用环境同位素估算中部盆地/埃尔比勒地下水平均停留时间

Bruska S. Mamand, D. Mawlood, Bruska S. Mamand
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引用次数: 0

摘要

无论是沿垂直方向还是水平方向,输入水补给地下水盆地并到达集水口所需的平均时间称为平均停留时间(MRT)。本研究旨在确定利用环境同位素技术估算井内地下水MRT的理论概念。为此,埃尔比勒市降水中氧-18的时空数据来源于全球降水同位素网络(GNIP)。此外,还选择了位于地下水中心盆地的埃尔比勒市的一口井(HWL)。由于测得的δ 18o是估算地下水MRT的天然示踪剂,故采用空腔环衰谱仪对样品进行同位素分析。采用正弦波回归推导法测量了降水和地下水中δ 18o的变化。输入(降水)与输出(地下水)相移5.74‰至0.277‰,δ 18o同位素幅值减小,可用正弦波方程求解,估算含水层地下水的MRT。结果表明:根据地下水对降水输入的时间响应,埃尔比勒市HWL井的MRT估计为1202 d。由此得出结论,地下水需要1202天的时间来重新补给HWL井。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Estimating Mean Residence Time of Groundwater in Central Basin/Erbil using Environmental Isotopes
The average time of input water needs to recharge the groundwater basin and reach a catchment outlet, whether it follows a vertical or horizontal flow direction, is known as the mean residence time (MRT). This study aims to identify the theory concepts of estimation MRT of groundwater in a well using environmental isotope technique. For this purpose, the spatiotemporal data of oxygen-18 of precipitation in Erbil city were taken from Global Network of Isotopes in Precipitation (GNIP). Furthermore, a well named (HWL) in Erbil city that located at central basin of groundwater were selected. Because of δ 18 O measured as a natural tracer for estimation MRT in groundwater, the sample analyzed for isotope by using the cavity ring down spectrometer. The derivation of sine wave regression was used to measure δ 18 O variations in both precipitation and groundwater. Decreasing isotopic amplitude of δ 18 O due to the phase shift from input (precipitation) which is 5.74 ‰ to output (groundwater) to 0.277 ‰ can solve by sine wave equation to estimate MRT of groundwater in aquifer. Results showed that, by temporal response of groundwater to precipitation inputs, MRT from HWL well in Erbil city estimated was 1202 days. This concluded that groundwater spent about 1202 days for recharging HWL well.
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