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DOI	10.1016/j.jhydrol.2021.125965
	Quantifying temporal variability and spatial heterogeneity in rainfall recharge thresholds in a montane karst environment
	Baker, Andy; Scheller, Mirjam; Oriani, Fabio; Mariethoz, Gregoire; Hartmann, Andreas; Wang, Zhangyong; Cuthbert, Mark O.
通讯作者	Baker, A (通讯作者)，UNSW Sydney, Connected Waters Initiat, Sydney, NSW 2052, Australia.
发表日期	2021
ISSN	0022-1694
EISSN	1879-2707
卷号	594
英文摘要	Quantifying rainfall recharge thresholds, including their spatial and temporal heterogeneity, is of fundamental importance to better understand recharge processes and improving estimation of recharge rates. Caves provide a unique observatory into the percolation of water from the surface to the water table at the timescale of individual rainfall recharge events. Here, we monitor nine infiltration sites over six years at a montane cave site in south eastern Australia. Six of the drip hydrology time series have up to similar to 100 hydrograph responses to rainfall over the monitoring period, three sites do not respond to rainfall events. We use two approaches to quantify rainfall recharge thresholds. At an annual timescale, for all nine drip sites, the total annual percolation water volume was determined for each year of data. Daily rainfall recharge thresholds were then determined by maximising the correlation of annual percolation water volume and total precipitation above a variable daily threshold value. The annual recharge amount methodology produced rainfall recharge thresholds for seven sites, where high and significant correlations (rank correlations > 0.75) occur for daily precipitation thresholds between 6 mm and 38 mm/day. No rainfall recharge thresholds could be obtained from one site which had a low and constant annual drip amount, and from one site which exhibited 'underflow' behaviour. At an event timescale, for the six sites which had a hydrograph response to rainfall, the 7-day antecedent rainfall amounts were determined. Minimum 7-day precipitation amounts prior to a hydrograph response for specific drip sites were in the range 13-28 mm and 75% of all recharge events had a 7-day antecedent precipitation between 20.7 and 38.1 mm. Combining all drip water monitoring sites and analysing the data by month identifies a seasonal variability in the minimum 7-day antecedent precipitation necessary to generate potential recharge, from 15 to 25 mm in winter to >50 mm in February and March. We apply a simple water budget model, driven by P and ET and optimised to the observed potential recharge events, to infer a 'whole cave' soil and epikarst storage capacity. This storage capacity is between similar to 50 mm (using potential evapotranspiration, 92% of events simulated successfully) to similar to 60 mm (using actual evapotranspiration, 79% of events simulated successfully). Modelling of individual drip sites identifies spatial heterogeneity in soil and epikarst storage capacities. Our approach using multiple methodologies allows the comparison between both daily and weekly rainfall recharge thresholds and modelled soil and epikarst storage for the first time.
关键词	DRIP WATER CAVE ZONE SIMULATION AUSTRALIA DATASET RATES
英文关键词	Groundwater; Rainfall recharge; Karst hydrology; Cave drip water; Bucket models
语种	英语
WOS研究方向	Engineering ; Geology ; Water Resources
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS记录号	WOS:000641589600070
来源期刊	JOURNAL OF HYDROLOGY
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/255011
作者单位	[Baker, Andy; Hartmann, Andreas; Cuthbert, Mark O.] UNSW Sydney, Connected Waters Initiat, Sydney, NSW 2052, Australia; [Scheller, Mirjam; Hartmann, Andreas] Albert Ludwigs Univ Freiburg, Chair Hydrol Modeling & Water Resources, Friedrichstr 39, D-79098 Freiburg, Germany; [Oriani, Fabio; Mariethoz, Gregoire] Univ Lausanne, Fac Geosci & Environm, Inst Earth Surface Dynam, Geopolis, CH-1015 Lausanne, Switzerland; [Wang, Zhangyong] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Desert & Desertificat, Lanzhou, Peoples R China; [Cuthbert, Mark O.] Cardiff Univ, Sch Earth & Environm Sci, Cardiff CF10 3AT, Wales
推荐引用方式 GB/T 7714	Baker, Andy,Scheller, Mirjam,Oriani, Fabio,et al. Quantifying temporal variability and spatial heterogeneity in rainfall recharge thresholds in a montane karst environment[J]. 中国科学院西北生态环境资源研究院,2021,594.
APA	Baker, Andy.,Scheller, Mirjam.,Oriani, Fabio.,Mariethoz, Gregoire.,Hartmann, Andreas.,...&Cuthbert, Mark O..(2021).Quantifying temporal variability and spatial heterogeneity in rainfall recharge thresholds in a montane karst environment.JOURNAL OF HYDROLOGY,594.
MLA	Baker, Andy,et al."Quantifying temporal variability and spatial heterogeneity in rainfall recharge thresholds in a montane karst environment".JOURNAL OF HYDROLOGY 594(2021).