气候变化领域集成服务门户(CCPortal): Hydrological characterization of cave drip waters in a porous limestone: Golgotha Cave; Western Australia

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DOI	10.5194/hess-22-977-2018
	Hydrological characterization of cave drip waters in a porous limestone: Golgotha Cave; Western Australia
	Mahmud K.; Mariethoz G.; Baker A.; Treble P.C.
发表日期	2018
ISSN	1027-5606
起始页码	977
结束页码	988
卷号	22 期号:2
英文摘要	Cave drip water response to surface meteorological conditions is complex due to the heterogeneity of water movement in the karst unsaturated zone. Previous studies have focused on the monitoring of fractured rock limestones that have little or no primary porosity. In this study, we aim to further understand infiltration water hydrology in the Tamala Limestone of SW Australia, which is Quaternary aeolianite with primary porosity. We build on our previous studies of the Golgotha Cave system and utilize the existing spatial survey of 29 automated cave drip loggers and a lidar-based flow classification scheme, conducted in the two main chambers of this cave. We find that a daily sampling frequency at our cave site optimizes the capture of drip variability with the least possible sampling artifacts. With the optimum sampling frequency, most of the drip sites show persistent autocorrelation for at least a month, typically much longer, indicating ample storage of water feeding all stalactites investigated. Drip discharge histograms are highly variable, showing sometimes multimodal distributions. Histogram skewness is shown to relate to the wetter-than-average 2013 hydrological year and modality is affected by seasonality. The hydrological classification scheme with respect to mean discharge and the flow variation can distinguish between groundwater flow types in limestones with primary porosity, and the technique could be used to characterize different karst flow paths when high-frequency automated drip logger data are available. We observe little difference in the coefficient of variation (COV) between flow classification types, probably reflecting the ample storage due to the dominance of primary porosity at this cave site. Moreover, we do not find any relationship between drip variability and discharge within similar flow type. Finally, a combination of multidimensional scaling (MDS) and clustering by k means is used to classify similar drip types based on time series analysis. This clustering reveals four unique drip regimes which agree with previous flow type classification for this site. It highlights a spatial homogeneity in drip types in one cave chamber, and spatial heterogeneity in the other, which is in agreement with our understanding of cave chamber morphology and lithology. © 2018 Author(s).
语种	英语
scopus关键词	Digital storage; Graphic methods; Groundwater; Groundwater flow; Lithology; Porosity; Statistical methods; Time series analysis; Classification scheme; Coefficient of variation; Hydrological characterization; Meteorological condition; Multi-dimensional scaling; Multimodal distributions; Sampling frequencies; Spatial heterogeneity; Limestone; cave system; climate conditions; discharge; fracture zone; groundwater flow; infiltration; karst hydrology; limestone; porosity; porous medium; vadose zone; Australia; Golgotha Cave; Western Australia
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160132
作者单位	Mahmud, K., Hawkesbury Institute for the Environment, Western Sydney University, Locked Bag 1797, Penrith, NSW, Australia; Mariethoz, G., Institute of Earth Surface Dynamics, University of Lausanne, Lausanne, Switzerland; Baker, A., Connected Waters Initiative Research Centre, UNSW Australia, Sydney, NSW, Australia; Treble, P.C., Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW, Australia
推荐引用方式 GB/T 7714	Mahmud K.,Mariethoz G.,Baker A.,et al. Hydrological characterization of cave drip waters in a porous limestone: Golgotha Cave; Western Australia[J],2018,22(2).
APA	Mahmud K.,Mariethoz G.,Baker A.,&Treble P.C..(2018).Hydrological characterization of cave drip waters in a porous limestone: Golgotha Cave; Western Australia.Hydrology and Earth System Sciences,22(2).
MLA	Mahmud K.,et al."Hydrological characterization of cave drip waters in a porous limestone: Golgotha Cave; Western Australia".Hydrology and Earth System Sciences 22.2(2018).