Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/S0022-1694(96)03100-9 |
Chemical and isotopic indicators of point-source recharge to a karst aquifer, South Australia | |
Herczeg, AL; Leaney, FWJ; Stadter, MF; Allan, GL; Fifield, LK | |
通讯作者 | Herczeg, AL |
来源期刊 | JOURNAL OF HYDROLOGY
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ISSN | 0022-1694 |
出版年 | 1997 |
卷号 | 192期号:1-4页码:271-299 |
英文摘要 | Several hundred sinkholes, swamps and open drainage boreholes throughout the semi-arid to sub-humid areas of the southeast of South Australia are potential recharge sites to the upper part of the Gambler Limestone aquifer. This paper presents the results from a hydrochemical (Cl- and carbonate chemistry) and isotopic (delta(2)H, delta(18)O and Cl-36) study used to estimate the importance of localised recharge from these point-source features to the karstic groundwater system. Results show that water recharging the groundwater via point-source features is detectable only on a local scale. Chemical and isotopic compositions of groundwaters more than 150 m from the larger of the point-source features are indistinguishable from regional groundwater compositions. Chloride concentrations, carbonate chemistry, and isotope data show that annual input of water via point sources contributes less than 10% of total recharge, with diffuse recharge providing the remainder to the study area as a whole. Point-source recharge is generally intermittent, and was observed to occur only for a few days at a time and only after a threshold of sustained rainfall had been exceeded (i.e. greater than 2.5 mm day(-1) for more than 3 days). The stable isotopic composition of waters recharging via sinkholes tends to be enriched in H-2 and O-18 relative to regional groundwater and local precipitation. This is probably caused by a small degree of evaporation (less than 5% of water falling within the catchment) occurring during winter at high relative humidity (greater than 95%) before recharge, Cl-36 from weapons testing is detectable in groundwaters near sinkholes and indicates significant retardation of Cl- within soils of the respective sub-drainage systems. Recharge has therefore occurred within the past 30 years, but cannot be quantified with any reliable precision from the Cl-36 data. (C) 1997 Elsevier Science B.V. |
类型 | Article |
语种 | 英语 |
国家 | AUSTRALIA |
收录类别 | SCI-E |
WOS记录号 | WOS:A1997XH24800014 |
WOS关键词 | GROUNDWATER ; GEOCHEMISTRY ; FLORIDA ; BASIN |
WOS类目 | Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources |
WOS研究方向 | Engineering ; Geology ; Water Resources |
来源机构 | Commonwealth Scientific and Industrial Research Organisation |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/134629 |
作者单位 | (1)CSIRO,DIV WATER RESOURCES,GLEN OSMOND,SA 5064,AUSTRALIA;(2)S AUSTRALIAN DEPT MINES & ENERGY,NARACOORTE,SA 5271,AUSTRALIA;(3)AUSTRALIAN NATL UNIV,RES SCH PHYS SCI,DEPT NUCL PHYS,CANBERRA,ACT 2601,AUSTRALIA |
推荐引用方式 GB/T 7714 | Herczeg, AL,Leaney, FWJ,Stadter, MF,et al. Chemical and isotopic indicators of point-source recharge to a karst aquifer, South Australia[J]. Commonwealth Scientific and Industrial Research Organisation,1997,192(1-4):271-299. |
APA | Herczeg, AL,Leaney, FWJ,Stadter, MF,Allan, GL,&Fifield, LK.(1997).Chemical and isotopic indicators of point-source recharge to a karst aquifer, South Australia.JOURNAL OF HYDROLOGY,192(1-4),271-299. |
MLA | Herczeg, AL,et al."Chemical and isotopic indicators of point-source recharge to a karst aquifer, South Australia".JOURNAL OF HYDROLOGY 192.1-4(1997):271-299. |
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