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
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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.
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页码:313 / 318
页数:4
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