Estimating epikarst water storage by time-lapse surface to depth gravity measurements

Champollion, Cédric; Devile, Sabrina; Chéry, Jean; Doerflinger, E.; Moigne, Nicolas Le; Bayer, R.; Vernant, Philippe

doi:10.5194/hess-2016-355

Cited by 5 publications

(4 citation statements)

References 27 publications

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“…The implication of this finding is that hydrograph separation techniques may have limited applicability in less mature karst landscapes for differentiating soil hydrologic processes (e.g., piping through macropores) from tertiary pathways such as sinkholes and swallets. Findings from the Camden Creek analysis agree with the prevailing thought that the epikarst acts as a dynamic zone of water transfer and storage during moderate to extreme events (Aquilina, Ladouche, & Dörfliger, ; Champollion et al, ; Husic, Fox, Adams, et al, ; Williams, ).…”

Section: Discussionsupporting

confidence: 79%

Long‐term assessment of nutrient flow pathway dynamics and in‐stream fate in a temperate karst agroecosystem watershed

Ford

Husic

Fogle

et al. 2019

Hydrological Processes

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Nutrient dynamics in karst agroecosystems remain poorly understood, in part due to limited long-term nested datasets that can discriminate upland and in-stream processes. We present a 10-year dataset from a karst watershed in the Inner-Bluegrass Region of central Kentucky, consisting of nitrate (nitrate-N [NO 3 − ]), dissolved reactive phosphorus (DRP), total organic carbon (TOC), and total ammoniacal-N (TAN) measurements at nested spring and stream sites as well as flowrate at the watershed outlet. Hydrograph separation techniques were coupled with multiple linear regression and Empirical Mode Decomposition time-series analysis to determine significance of seasonal processes and to generate continuous estimates of nutrient pathway loadings. Further, we used model results of benthic algae growth and decomposition dynamics from a nearby watershed to assess if transient storage in algal biomass could explain differences in spring and downstream watershed nutrient loading. Results highlight statistically significant seasonality for all nutrients at stream sites, but only for NO 3 − at springs with longitudinal variability showing significant decreases occurring from spring to stream sites for NO 3 − and DRP, and significant increases for TOC and TAN. Pathway loading analysis highlighted the importance of slow flow pathways to source approximately 70% of DRP and 80% of NO 3 − . Results for in-stream dynamics suggest that benthic autotroph dynamics can explain summer deviations for TOC, TAN, and DRP but not NO 3 − . Regarding upland dynamics, our findings agree well with existing perceptions in karst for N pathways and upland source seasonality but deviate from perceptions that karst conduits are retentive of P, reflecting the limited buffering capacity of the soil profile and conduit sediments in the Inner-Bluegrass. Regarding in-stream fate, our findings highlighted the significance of seasonally driven nutrient processing in the bedrock-controlled streambed to influence nutrient fluxes at the watershed outlet. Contrary to existing perceptions, we found high N attenuation and an unexplained NO 3 − sink in the bedrock stream, leading us to postulate that floating macrophytes facilitate high rates of denitrification. KEYWORDS bedrock stream, hydrologic pathways, in-stream fate, karst agroecosystem watershed, nutrient loadings, time-series analysis

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Section: Discussionsupporting

confidence: 79%

Long‐term assessment of nutrient flow pathway dynamics and in‐stream fate in a temperate karst agroecosystem watershed

Ford

Husic

Fogle

et al. 2019

Hydrological Processes

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“…(2009) and Champollion et al. (2018). The SG iOSG#024 (Boy et al., 2020) was installed in 2015 at a depth of 512 m (507 m.a.s.l.)…”

Section: Methodsmentioning

confidence: 97%

First Evidence of Correlation Between Evapotranspiration and Gravity at a Daily Time Scale From Two Vertically Spaced Superconducting Gravimeters

Carrière

Loiseau

Champollion

et al. 2021

Geophysical Research Letters

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Evapotranspiration (ET) is a key variable to understanding eco-hydrosystems because it links water, carbon, and energy cycles (Fisher, 2014). ET is a major component of the water cycle, accounting for approximately 70% of precipitated water at the continental scale (Fisher et al., 2017;Oki & Kanae, 2006). Several approaches exist for estimating ET, but large uncertainties persist and estimates remain difficult to validate, particularly at large scale (Müller & Bolte, 2009;Verstraeten et al., 2008). New approaches for estimating ET are crucially needed to improve our understanding of related processes.Gravimetry is a geophysical method that measures the gravitational acceleration field (g). During the last decades, progress has led to the development of devices that can now achieve precision of a few nm/s 2 and obtain highly accurate temporal monitoring (Van Camp et al., 2006). These advances now allow to study the dynamics of ET. Data from the GRACE (Gravity Recovery and Climate Experiment) satellite have been used to study ET (Long

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“…Considered individually, these methods have specific limitations in terms of resolution and depth of observation but they also have their specific interest. For example, surface-based seismic methods are adapted to detecting horizontal objects [5], electrical method to characterizing fluid saturation and behavior [6], electromagnetic methods for identifying karst and factures, and inferring water content [7,8], microgravimetric methods to detect deeper heterogeneities that could be hydrogeological anomalies and to estimating water storage [9].…”

Section: Hydrogeophysical Approach For Subsoil Characterizationmentioning

confidence: 99%

Multi-geophysical Field Measurements to Characterize Lithological and Hydraulic Properties of a Multi-scale Karstic and Fractured Limestone Vadose Zone: Beauce Aquifer (O-ZNS)

Mallet

Jodry

Isch

et al. 2022

Instrumentation and Measurement Technologies for Water Cycle Management

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Estimating epikarst water storage by time-lapse surface to depth gravity measurements

Cited by 5 publications

References 27 publications

Long‐term assessment of nutrient flow pathway dynamics and in‐stream fate in a temperate karst agroecosystem watershed

Long‐term assessment of nutrient flow pathway dynamics and in‐stream fate in a temperate karst agroecosystem watershed

First Evidence of Correlation Between Evapotranspiration and Gravity at a Daily Time Scale From Two Vertically Spaced Superconducting Gravimeters

Multi-geophysical Field Measurements to Characterize Lithological and Hydraulic Properties of a Multi-scale Karstic and Fractured Limestone Vadose Zone: Beauce Aquifer (O-ZNS)

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