气候变化领域集成服务门户(CCPortal): Storage dynamics; hydrological connectivity and flux ages in a karst catchment: Conceptual modelling using stable isotopes

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DOI	10.5194/hess-23-51-2019
	Storage dynamics; hydrological connectivity and flux ages in a karst catchment: Conceptual modelling using stable isotopes
	Zhang Z.; Chen X.; Cheng Q.; Soulsby C.
发表日期	2019
ISSN	1027-5606
起始页码	51
结束页码	71
卷号	23 期号:1
英文摘要	We developed a new tracer-aided hydrological model that disaggregates cockpit karst terrain into the two dominant landscape units of hillslopes and depressions (with fast and slow flow systems). The new model was calibrated by using high temporal resolution hydrometric and isotope data in the outflow of Chenqi catchment in Guizhou Province of south-western China. The model could track hourly water and isotope fluxes through each landscape unit and estimate the associated storage and water age dynamics. From the model results we inferred that the fast flow reservoir in the depression had the smallest water storage and the slow flow reservoir the largest, with the hillslope intermediate. The estimated mean ages of water draining the hillslope unit, and the fast and slow flow reservoirs during the study period, were 137, 326 and 493 days, respectively. Distinct seasonal variability in hydroclimatic conditions and associated water storage dynamics (captured by the model) were the main drivers of non-stationary hydrological connectivity between the hillslope and depression. During the dry season, slow flow in the depression contributes the largest proportion (78.4%) of flow to the underground stream draining the catchment, resulting in weak hydrological connectivity between the hillslope and depression. During the wet period, with the resulting rapid increase in storage, the hillslope unit contributes the largest proportion (57.5%) of flow to the underground stream due to the strong hydrological connectivity between the hillslope and depression. Meanwhile, the tracer-aided model can be used to identify the sources of uncertainty in the model results. Our analysis showed that the model uncertainty of the hydrological variables in the different units relies on their connectivity with the outlet when the calibration target uses only the outlet information. The model uncertainty was much lower for the "newer" water from the fast flow system in the depression and flow from the hillslope unit during the wet season and higher for "older" water from the slow flow system in the depression. This suggests that to constrain model parameters further, increased high-resolution hydrometric and tracer data on the internal dynamics of systems (e.g. groundwater responses during low flow periods) could be used in calibration. © Author(s) 2019.All Rights Reserved.
语种	英语
scopus关键词	Calibration; Catchments; Digital storage; Dynamics; Groundwater; Isotopes; Landforms; Runoff; Uncertainty analysis; Conceptual modelling; High temporal resolution; Hydroclimatic conditions; Hydrological connectivity; Hydrological modeling; Hydrological variables; Seasonal variability; Sources of uncertainty; Reservoirs (water); catchment; connectivity; groundwater; hillslope; hydrological change; hydrological modeling; karst; landscape; low flow; outflow; reservoir; stable isotope; water flux; water storage; China; Guizhou
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/159801
作者单位	Zhang, Z., State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, 210098, China, School of Geosciences, University of Aberdeen, Aberdeen, AB24 3UF, United Kingdom, College of Hydrology and Water Resources, Hohai University, Nanjing, 210098, China; Chen, X., Institute of Surface-Earth System Science, Tianjin University, Tianjin, China; Cheng, Q., State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, 210098, China, College of Hydrology and Water Resources, Hohai University, Nanjing, 210098, China; Soulsby, C., School of Geosciences, University of Aberdeen, Aberdeen, AB24 3UF, United Kingdom
推荐引用方式 GB/T 7714	Zhang Z.,Chen X.,Cheng Q.,et al. Storage dynamics; hydrological connectivity and flux ages in a karst catchment: Conceptual modelling using stable isotopes[J],2019,23(1).
APA	Zhang Z.,Chen X.,Cheng Q.,&Soulsby C..(2019).Storage dynamics; hydrological connectivity and flux ages in a karst catchment: Conceptual modelling using stable isotopes.Hydrology and Earth System Sciences,23(1).
MLA	Zhang Z.,et al."Storage dynamics; hydrological connectivity and flux ages in a karst catchment: Conceptual modelling using stable isotopes".Hydrology and Earth System Sciences 23.1(2019).