DOI: 10.5194/hess-19-2315-2015
Scopus记录号: 2-s2.0-84929629307
论文题名: Identifying flood recharge and inter-aquifer connectivity using multiple isotopes in subtropical Australia
作者: King A ; C ; , Raiber M ; , Cendón D ; I ; , Cox M ; E ; , Hollins S ; E
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2015
卷: 19, 期: 5 起始页码: 2315
结束页码: 2335
语种: 英语
Scopus关键词: Aquifers
; Catchments
; Floods
; Groundwater
; Groundwater resources
; Hydrochemistry
; Hydrogeology
; Isotopes
; Rain
; Runoff
; Surface water resources
; Surface waters
; Climatic conditions
; Coarse-grained sediments
; Geological setting
; Hydrological process
; Hydrological response
; Integrated approach
; Spatial and temporal scale
; Sustainable management
; Recharging (underground waters)
; aquifer
; bedrock
; climate conditions
; flooding
; groundwater
; headwater
; integrated approach
; isotopic analysis
; recharge
; spatiotemporal analysis
; stable isotope
; surface water
; sustainability
英文摘要: An understanding of hydrological processes is vital for the sustainable management of groundwater resources, especially in areas where an aquifer interacts with surface water systems or where aquifer interconnectivity occurs. This is particularly important in areas that are subjected to frequent drought/flood cycles, such as the Cressbrook Creek catchment in Southeast Queensland, Australia. In order to understand the hydrological response to flooding and to identify inter-aquifer connectivity, multiple isotopes (?2H, ?18O, 87Sr/86Sr, 3H and 14C) were used in this study in conjunction with a comprehensive hydrochemical assessment, based on data collected 6 months after severe flooding in 2011. The relatively depleted stable isotope signatures of the flood-generating rainfall (?2H: −30.2 to −27.8‰, ?18O: −5.34 to −5.13‰ VSMOW) were evident in surface water samples (?2H: −25.2 to −23.2‰, ?18O: −3.9 to −3.6‰ VSMOW), indicating that these extreme events were a major source of recharge to the dam in the catchment headwaters. Furthermore, stable isotopes confirmed that the flood generated significant recharge to the alluvium in the lower part of the catchment, particularly in areas where interactions between surface waters and groundwater were identified and where diffuse aquifer recharge is normally limited by a thick (approximately 10 m) and relatively impermeable unsaturated zone. However, in the upper parts of the catchment where recharge generally occurs more rapidly due to the dominance of coarse-grained sediments in the unsaturated zone, the stable isotope signature of groundwater resembles the longer-term average rainfall values (?2H: −12.6, ?18O: −3.4‰ VSMOW), highlighting that recharge was sourced from smaller rainfall events that occurred subsequent to the flooding. Interactions between the bedrock aquifers and the alluvium were identified at several sites in the lower part of the catchment based on 87Sr/86Sr ratios; this was also supported by the hydrochemical assessment, which included the modelling of evaporation trends and saturation indices. The integrated approach used in this study facilitated the identification of hydrological processes over different spatial and temporal scales, and the method can be applied to other complex geological settings with variable climatic conditions. © Author(s) 2015. CC Attribution 3.0 License. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78521
Appears in Collections: 气候变化事实与影响
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作者单位: School of Earth, Environmental and Biological Sciences, Queensland University of Technology (QUT), Brisbane, QLD, Australia; National Centre for Groundwater Research and Training (NCGRT), Adelaine, Australia; CSIRO Land and Water, Dutton Park, Brisbane, QLD, Australia; Australian Nuclear Science and Technology Organisation (ANSTO), Menai, Sydney, NSW, Australia; Connected Water Initiative, School of Biological, University of New South Wales (UNSW), Sydney, NSW, Australia
Recommended Citation:
King A,C,, Raiber M,et al. Identifying flood recharge and inter-aquifer connectivity using multiple isotopes in subtropical Australia[J]. Hydrology and Earth System Sciences,2015-01-01,19(5)