Groundwater recharge deduced from He isotopes in the Botswana Kalahari

被引：0

作者：

Selaolo, ET ^{[1
]}

Hilton, DR ^{[1
]}

Beekman, HE ^{[1
]}

机构：

[1] Geol Survey Dept, Lobatse, Botswana

来源：

GROUNDWATER: PAST ACHIEVEMENTS AND FUTURE CHALLENGES | 2000年

关键词：

D O I：

暂无

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

The long-term average areal recharge was evaluated for the Mmamabula aquifer in the eastern fringe of the Kalahari Basin using helium isotopes and abundances. Helium concentrations (He-4) and isotopic He-3/He-4 ratios were found to vary considerably both in the Mmamabula aquifer and along the He-4 contents range from 50 to 350 nccSTP/gH(2)O whereas He-3/He-4 ratios lie between 0.2 and 0.8R(A). The highest He-4 concentration (similar to 50 mu ccSTP/gH(2)O) and the lowest He-3/He-4 ratios (similar to 0.014R(A)) are found in the confined parts of the aquifer. The long-term average areal recharge rate is similar to 2.2 to 3.1 mmyr(-1) using the He-4 method. This range of recharge values is within the same order of magnitude as those obtained from the chloride mass balance, groundwater flow and hydrochemical-isotope modeling.

引用

页码：313 / 318

页数：4

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