Arid
DOI10.1007/s10040-015-1358-7
Long-term spatio-temporal precipitation variability in arid-zone Australia and implications for groundwater recharge
Acworth, R. Ian1; Rau, Gabriel C.1; Cuthbert, Mark O.2; Jensen, Evan1; Leggett, Keith3
通讯作者Acworth, R. Ian
来源期刊HYDROGEOLOGY JOURNAL
ISSN1431-2174
EISSN1435-0157
出版年2016
卷号24期号:4页码:905-921
英文摘要

Quantifying dryland groundwater recharge as a function of climate variability is becoming increasingly important in the face of a globally depleted resource, yet this remains a major challenge due to lack of adequate monitoring and the complexity of processes involved. A previously unpublished and unique dataset of high density and frequency rainfall measurements is presented, from the Fowlers Gap Arid Zone Research Station in western New South Wales (Australia). The dataset confirms extreme spatial and temporal variability in rainfall distribution which has been observed in other dryland areas and is generally explained by the dominance of individual storm cells. Contrary to previous observations, however, this dataset contains only a few localised storm cells despite the variability. The implications of spatiotemporal rainfall variability on the estimation of groundwater recharge is assessed and show that the most likely recharge mechanism is through indirect and localised, rather than direct, recharge. Examples of rainfall and stream gauge height illustrate runoff generation when a spatially averaged threshold of 15-25 mm (depending on the antecedent moisture conditions) is exceeded. Preliminary assessment of groundwater levels illustrates that the regional water table is much deeper than anticipated, especially considering the expected magnitude of indirect and localised recharge. A possible explanation is that pathways for indirect and localised recharge are inhibited by the large quantities of Aeolian dust observed at the site. Runoff readily occurs with water collecting in surface lakes which slowly dry and disappear. Assuming direct groundwater recharge under these conditions will significantly overestimate actual recharge.


英文关键词Australia Groundwater recharge/water budget Groundwater monitoring Groundwater/surface-water relations Arid regions
类型Article
语种英语
国家Australia ; England
收录类别SCI-E
WOS记录号WOS:000376405400011
WOS关键词RAINFALL
WOS类目Geosciences, Multidisciplinary ; Water Resources
WOS研究方向Geology ; Water Resources
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/193420
作者单位1.UNSW Australia, Sch Civil & Environm Engn, Connected Waters Initiat Res Ctr CWI, King St, Manly Vale 2093, Australia;
2.Univ Birmingham, Sch Geog Earth & Environm Sci, Birmingham B15 2TT, W Midlands, England;
3.UNSW, Fowlers Gap Arid Zone Res Stn, Sydney, NSW, Australia
推荐引用方式
GB/T 7714
Acworth, R. Ian,Rau, Gabriel C.,Cuthbert, Mark O.,et al. Long-term spatio-temporal precipitation variability in arid-zone Australia and implications for groundwater recharge[J],2016,24(4):905-921.
APA Acworth, R. Ian,Rau, Gabriel C.,Cuthbert, Mark O.,Jensen, Evan,&Leggett, Keith.(2016).Long-term spatio-temporal precipitation variability in arid-zone Australia and implications for groundwater recharge.HYDROGEOLOGY JOURNAL,24(4),905-921.
MLA Acworth, R. Ian,et al."Long-term spatio-temporal precipitation variability in arid-zone Australia and implications for groundwater recharge".HYDROGEOLOGY JOURNAL 24.4(2016):905-921.
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