Nonlinear kernel functions for karst aquifers

Jukić, Damir; Denić-Jukić, Vesna

doi:10.1016/j.jhydrol.2005.12.030

Cited by 43 publications

(39 citation statements)

References 30 publications

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“…Strong river bed karstification causes significant water losses along the stream causing alternating surface and subsurface flow (Bonacci, 1987(Bonacci, , 1993Bonacci et al, 2006). Krčić functions as a descending karstic spring (Jukić and Denić-Jukić, 2006) and dries up regularly every year from June to September, usually when springwater discharge of Krka River (below the mouth of Krčić) drops below 4.20 m 3 s À1 (Bonacci et al, 2006). However, in 2014 it retained water for the entire year because of exceptionally rainy summer (Fig.…”

Section: Study Areamentioning

confidence: 99%

Microbial mats as shelter microhabitat for amphipods in an intermittent karstic spring

Žutinić

Petrić

Gottstein

et al. 2018

Knowl. Manag. Aquat. Ecosyst.

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-Microbial mats represent complex communities where cyanobacteria and diatoms as key organisms provide shelter for diverse assemblages of aquatic invertebrates, like the small stygophilous amphipod Synurella ambulans. Studies addressing such communities in the karst springs have rarely examined springheads, and have ignored intermittent springs. During high flow conditions the stygophilic crustaceans are flushed to the surface of a temporary stream Krčić where microbial mats prevent their drift and enables their successful retreat into underground in the periods of drought. The objective of this study was to characterize the microbial mat community of the Krčić Spring as a shelter for S. ambulans during strong current and high water level. Representative samples for diatom and cyanobacterial species identification and composition, as well as the fresh mat material for potential animal activity and cyanobacterial phylogenetic analysis were collected. The most dominant diatom was Achnanthidium minutissimum, whilst Fragilaria capucina, Meridion circulare, Navicula cryptocephala and Nitzschia palea had abundance greater than 0.5%. Morphological observations of cyanobacteria revealed that Phormidium favosum was the most dominant, with Hydrocoleum muscicola as a subdominant. Cyanobacterial phylogenetic relationship revealed two distinct clusters: (i) "Phormidium cluster", confirming morphological observations in both winter and spring samples, and (ii) "Wilmottia cluster", a first report for Croatia and found exclusively in the winter sample. Laboratory observations revealed a small stygophilic amphipod S. ambulans, hiding and feeding inside the pockets of fresh microbial mat. The intermittent Krčić Spring as a predator-free and competitor-free ecosystem provides a spatiotemporal conformity between microbial mat and stygophilous amphipod.Keywords: Microbial mat / cyanobacteria / diatoms / amphipods / karstic spring Résumé -Le tapis microbien comme microhabitat refuge pour les amphipodes dans une source karstique intermittente. Le tapis microbien représente des communautés complexes où les cyanobactéries et les diatomées, en tant qu'organismes clés, abritent divers assemblages d'invertébrés aquatiques, comme les petits amphipodes stygophiles Synurella ambulans. Les études portant sur ces communautés dans les sources karstiques ont rarement examiné ces têtes de ruisseaux et ont ignoré les sources intermittentes. Dans les conditions d'écoulement fort, les crustacés stygophiles sont chassés à la surface d'un ruisseau temporaire Krčić où les tapis microbiens empêchent leur dérive et permettent leur retrait dans le sous-sol en période de sécheresse. L'objectif de cette étude était de caractériser la communauté du tapis microbien de la source Krčić comme abri pour S. ambulans lors de forts courants et de niveaux d'eau élevés. La diatomée la plus dominante était Achnanthidium minutissimum, tandis que Fragilaria capucina, Meridion circulare, Navicula cryptocephala et Nitzschia palea avaient une abondance supérieure à ...

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Section: Study Areamentioning

confidence: 99%

Microbial mats as shelter microhabitat for amphipods in an intermittent karstic spring

Žutinić

Petrić

Gottstein

et al. 2018

Knowl. Manag. Aquat. Ecosyst.

View full text Add to dashboard Cite

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“…1) and has been described by other terms, including instantaneous unit hydrograph, transfer function, and kernel (e.g., Nash, 1959;Dreiss, 1989;Berendrecht et al, 2003;Smith, 2003;Jukić and Denić-Jukić, 2006). However, the term "transfer function" should only be applied to the Fourier transform of the IRF (Smith, 2003).…”

Section: Impulse-response Functionmentioning

confidence: 99%

“…Deconvolution methods include Fourier harmonic time-series analysis (Blank et al, 1971;Delleur and Rao, 1971), linear programming (Neuman and de Marsily, 1976), and time-moment analysis (Dreiss, 1989). Estimations of nonparametric IRFs by model calibration include those described by Pinault et al (2001) and Jukić and Denić-Jukić (2006). A potential problem with nonparametric IRFs is that hundreds or even thousands of IRF ordinates may be needed to define the IRF, depending on the IRF length and time step.…”

Section: Nonparametric Irfsmentioning

confidence: 99%

“…Further, an over-fitted model results in a poor model fit when tested on a conditional validation period that was sequestered from the fitting process. Pinault et al (2001), Jukić and Denić-Jukić (2006), and Ladouche et al (2014) described different methods to constrain the nonparametric IRF and reduce the number of fitting parameters.…”

Section: Nonparametric Irfsmentioning

confidence: 99%

“…In many hydrologic systems, however, the IRF changes with changing climatic conditions, resulting in a change in response characteristics (Larocque et al, 1998;Long and Mahler, 2013). Additional details and examples of time-variant IRFs for hydrologic applications include Pinault et al (2001), Jukić and Denić-Jukić (2006), and Long and Mahler (2013).…”

Section: Linearity and Time Variancementioning

confidence: 99%

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RRAWFLOW: Rainfall-Response Aquifer and Watershed Flow Model (v1.15)

Long

2015

Geosci. Model Dev.

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Abstract. The Rainfall-Response Aquifer and Watershed Flow Model (RRAWFLOW) is a lumped-parameter model that simulates streamflow, spring flow, groundwater level, or solute transport for a measurement point in response to a system input of precipitation, recharge, or solute injection. I introduce the first version of RRAWFLOW available for download and public use and describe additional options. The open-source code is written in the R language and is available at http://sd.water.usgs.gov/projects/RRAWFLOW/ RRAWFLOW.html along with an example model of streamflow. RRAWFLOW includes a time-series process to estimate recharge from precipitation and simulates the response to recharge by convolution, i.e., the unit-hydrograph approach. Gamma functions are used for estimation of parametric impulse-response functions (IRFs); a combination of two gamma functions results in a double-peaked IRF. A spline fit to a set of control points is introduced as a new method for estimation of nonparametric IRFs. Several options are included to simulate time-variant systems. For many applications, lumped models simulate the system response with equal accuracy to that of distributed models, but moreover, the ease of model construction and calibration of lumped models makes them a good choice for many applications (e.g., estimating missing periods in a hydrologic record). RRAWFLOW provides professional hydrologists and students with an accessible and versatile tool for lumped-parameter modeling.

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Karst water resources in a changing world: Review of hydrological modeling approaches

et al. 2014

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Karst regions represent 7–12% of the Earth's continental area, and about one quarter of the global population is completely or partially dependent on drinking water from karst aquifers. Climate simulations project a strong increase in temperature and a decrease of precipitation in many karst regions in the world over the next decades. Despite this potentially bleak future, few studies specifically quantify the impact of climate change on karst water resources. This review provides an introduction to karst, its evolution, and its particular hydrological processes. We explore different conceptual models of karst systems and how they can be translated into numerical models of varying complexity and therefore varying data requirements and depths of process representation. We discuss limitations of current karst models and show that at the present state, we face a challenge in terms of data availability and information content of the available data. We conclude by providing new research directions to develop and evaluate better prediction models to address the most challenging problems of karst water resources management, including opportunities for data collection and for karst model applications at so far unprecedented scales.

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Nonlinear kernel functions for karst aquifers

Cited by 43 publications

References 30 publications

Microbial mats as shelter microhabitat for amphipods in an intermittent karstic spring

Microbial mats as shelter microhabitat for amphipods in an intermittent karstic spring

RRAWFLOW: Rainfall-Response Aquifer and Watershed Flow Model (v1.15)

Karst water resources in a changing world: Review of hydrological modeling approaches

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