DOI: 10.1016/j.quascirev.2012.12.015
Scopus记录号: 2-s2.0-84873265761
论文题名: An isotopic and modelling study of flow paths and storage in Quaternary calcarenite, SW Australia: Implications for speleothem paleoclimate records
作者: Treble P.C. ; Bradley C. ; Wood A. ; Baker A. ; Jex C.N. ; Fairchild I.J. ; Gagan M.K. ; Cowley J. ; Azcurra C.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 64 起始页码: 90
结束页码: 103
语种: 英语
英文关键词: Dripwater
; Dune calcarenite
; Eogenetic
; Modelling
; O isotopes
; Rainfall δ18O
; SW Western Australia
Scopus关键词: Australia
; Calcarenite
; Diffuse flow
; Drip rate
; Dripwater
; Eogenetic
; Epikarst
; Flow path
; Host rocks
; Hydrological models
; Hydrological process
; Isotopic composition
; Lumped parameter
; Model outputs
; Modelling studies
; Non-linear thresholds
; Observed data
; Paleoclimate records
; Rain events
; Southwest western australia
; Subsurface hydrology
; Transit time
; Vadose zone hydrology
; Water flux
; Western Australia
; Caves
; Digital storage
; Hydrology
; Isotopes
; Limestone
; Models
; Reservoirs (water)
; Soil moisture
; Rain
; calcarenite
; diffusion
; dune
; flow pattern
; host rock
; hydrological modeling
; isotopic analysis
; karst hydrology
; limestone
; numerical model
; oxygen isotope
; paleoclimate
; preferential flow
; rainfall
; recharge
; reservoir
; seepage
; soil moisture
; speleothem
; water flow
; water storage
; Australia
英文摘要: We investigated the distinctive shallow sub-surface hydrology of the southwest Western Australia (SWWA) dune calcarenite using observed rainfall and rainfall δ18O; soil moisture, cave drip rate and dripwater δ18O over a six-year period: August 2005-March 2012. A lumped parameter hydrological model is developed to describe water fluxes and drip δ18O. Comparison of observed data and model output allow us to assess the critical non-climatic karst hydrological processes that modify the precipitation δ18O signal and discuss the implications for speleothem paleoclimate records from this cave and those with a similar karst setting. Our findings include evidence of multiple reservoirs, characterised by distinct δ18O values and recharge responses ('low' and 'high' flow sites). Dripwaters exhibit δ18O variations in wet versus dry years at low-flow sites receiving diffuse seepage from the epikarst with an attenuated isotopic composition that approximates mean rainfall. Recharge from high-magnitude rain events is stored in a secondary reservoir which is associated with high-flow dripwater that is 1‰ lower than our monitored low-flow sites (δ18O). One drip site is characterised by mixed-flow behaviour and exhibits a non-linear threshold response after the cessation of drainage from a secondary reservoir following a record dry year (2006). Additionally, our results yield a better understanding of the vadose zone hydrology and dripwater characteristics in Quaternary age dune limestones. We show that flow to our monitored sites is dominated by diffuse flow with inferred transit times of less than one year. Diffuse flow appears to follow vertical preferential paths through the limestone reflecting differences in permeability and deep recharge into the host rock. © 2013. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60691
Appears in Collections: 过去全球变化的重建
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作者单位: Institute for Environmental Research, Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW, Australia; Research School of Earth Sciences, Australian National University, Canberra, ACT, Australia; School of Geography Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, United Kingdom; Department of Environment and Conservation, 14 Queen St., Busselton, WA, Australia; Connected Waters Initiative Research Centre, University of New South Wales, Sydney, NSW, Australia; National Centre for Groundwater Research and Training, Australia
Recommended Citation:
Treble P.C.,Bradley C.,Wood A.,et al. An isotopic and modelling study of flow paths and storage in Quaternary calcarenite, SW Australia: Implications for speleothem paleoclimate records[J]. Quaternary Science Reviews,2013-01-01,64