Storage-discharge relationships at different catchment scales based on local high-precision gravimetry

Creutzfeldt, Benjamín; Troch, P. A.; Güntner, Andreas; Ferré, T. P. A.; Graeff, Thomas; Merz, Bruno

doi:10.1002/hyp.9689

Cited by 40 publications

(37 citation statements)

References 104 publications

(132 reference statements)

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“…Conventional gravity surveying may quickly reach its limits in applications -hydrology, volcanology, civil engineering, archaeology -where high resolution is mandatory or to monitor density changes underground (e.g. Christiansen et al, 2011;Creutzfeldt et al, 2014). Measurement points generally remain sparse, especially when absolute gravity meters are employed, and are not suitable for producing high-resolution models of the density structure.…”

Section: Introductionmentioning

confidence: 99%

Improvement of density models of geological structures by fusion of gravity data and cosmic muon radiographies

Jourde

Gibert

Marteau

2015

Geosci. Instrum. Method. Data Syst.

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Abstract. This paper examines how the resolution of smallscale geological density models is improved through the fusion of information provided by gravity measurements and density muon radiographies. Muon radiography aims at determining the density of geological bodies by measuring their screening effect on the natural flux of cosmic muons. Muon radiography essentially works like a medical X-ray scan and integrates density information along elongated narrow conical volumes. Gravity measurements are linked to density by a 3-D integration encompassing the whole studied domain. We establish the mathematical expressions of these integration formulas -called acquisition kernels -and derive the resolving kernels that are spatial filters relating the true unknown density structure to the density distribution actually recovered from the available data. The resolving kernel approach allows one to quantitatively describe the improvement of the resolution of the density models achieved by merging gravity data and muon radiographies. The method developed in this paper may be used to optimally design the geometry of the field measurements to be performed in order to obtain a given spatial resolution pattern of the density model to be constructed. The resolving kernels derived in the joined muon-gravimetry case indicate that gravity data are almost useless for constraining the density structure in regions sampled by more than two muon tomography acquisitions. Interestingly, the resolution in deeper regions not sampled by muon tomography is significantly improved by joining the two techniques. The method is illustrated with examples for the La Soufrière volcano of Guadeloupe.

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Section: Introductionmentioning

confidence: 99%

Improvement of density models of geological structures by fusion of gravity data and cosmic muon radiographies

Jourde

Gibert

Marteau

2015

Geosci. Instrum. Method. Data Syst.

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“…The main applications to hydrology of time-lapse microgravity surveys are (1) specific yield estimates [Montgomery, 1971;Lambert and Beaumont, 1977;Cole, 1991;Pool and Eychaner, 1995;Howle et al, 2003;Pool, 2008;Gehman et al, 2009], (2) monitoring water storage changes (WSCs) on specific areas for process identification or water budget estimates [Whitcomb et al, 1980;Naujoks et al, 2008;Chapman et al, 2008;Gettings et al, 2008;McClymont et al, 2012;Pfeffer et al, 2013], and (3) calibration-validation of conceptual or physically based hydrological models Naujoks et al, 2010;Christiansen et al, 2011aChristiansen et al, ,2011b. Only few studies used gravity data to address the link between WSCs and discharge [Jacob et al, 2008;Lampitelli and Francis, 2010;Kroner and Weise, 2011;Creutzfeldt et al, 2012Creutzfeldt et al, , 2014.…”

Section: Introductionmentioning

confidence: 99%

Water storage changes as a marker for base flow generation processes in a tropical humid basement catchment (Benin): Insights from hybrid gravimetry

Hector

Séguis

Hinderer

et al. 2015

Water Resources Research

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In basement catchments of subhumid West Africa, base flow is the main component of annual streamflow. However, the important heterogeneity of lithology hinders the understanding of base flow generation processes. Since these processes are linked with water storage changes (WSCs) across the catchment, we propose the use of hybrid gravity data in addition to neutron probe-derived water content and water levels to monitor spatiotemporal WSC of a typical crystalline basement headwater catchment (16 ha) in Benin. WSC behaviors are shown to provide insights into hydrological processes in terms of water redistribution toward the catchment outlet. Hybrid gravimetry produces gravity change observations from time-lapse microgravity surveys coupled with gravity changes monitored at a base station using a superconducting gravimeter and/or an absolute gravimeter. A dense microgravity campaign (70 surveys of 14 stations) covering three contrasted years was set up with a rigorous protocol, leading to low uncertainties (<2.5 lGal) on station gravity determinations (with respect to the network reference station). Empirical orthogonal function analyses of both gravity changes and WSCs from neutron probe data show similar spatial patterns in the seasonal signal. Areas where storage and water table show a capping behavior (when data reach a plateau during the wet season), suggesting threshold-governed fast subsurface redistribution, are identified. This observed storage dynamics, together with geological structures investigated by electrical resistivity tomography and drill log analysis, make it possible to derive a conceptual model for the catchment hydrology.

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“…Measured hydrological fluxes were used to calculate the catchment water balance on a water‐year basis and to determine water storage within the catchment as a residual:

normalΔ S = P - ((), Q + E T)

where ΔS is the change in storage (Creutzfeldt et al ., ). We did not apply Equation at the ecosystem scale because of the lack of ecosystem‐specific discharge measurements.…”

Section: Methodsmentioning

confidence: 99%

The relative contributions of alpine and subalpine ecosystems to the water balance of a mountainous, headwater catchment

et al. 2015

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Climate change is affecting the hydrology of high‐elevation mountain ecosystems, with implications for ecosystem functioning and water availability to downstream populations. We directly and continuously measured precipitation and evapotranspiration (ET) from both subalpine forest and alpine tundra portions of a single catchment, as well as discharge fluxes at the catchment outlet, to quantify the water balance of a mountainous, headwater catchment in Colorado, USA. Between 2008 and 2012, the water balance closure averaged 90% annually, and the catchment ET was the largest water output at 66% of precipitation. Alpine ET was greatest during the winter, in part because of sublimation from blowing snow, which contributed from 27% to 48% of the alpine, and 6% to 9% of the catchment water balance, respectively. The subalpine ET peaked in summer. Alpine areas generated the majority of the catchment discharge, despite covering only 31% of the catchment area. Although the average annual alpine runoff efficiency (discharge/precipitation; 40%) was greater than the subalpine runoff efficiency (19%), the subalpine runoff efficiency was more sensitive to changes in precipitation. Inter‐annual analysis of the evaporative and dryness indices revealed persistent moisture limitations at the catchment scale, although the alpine alternated between energy‐limited and water‐limited states in wet and dry years. Each ecosystem generally over‐generated discharge relative to that expected from a Budyko‐type model. The alpine and catchment water yields were relatively unaffected by annual meteorological variability, but this interpretation was dependent on the method used to quantify potential ET. Our results indicate that correctly accounting for dissimilar hydrological cycling above and below alpine treeline is critical to quantify the water balance of high‐elevation mountain catchments over periods of meteorological variability. Copyright © 2015 John Wiley & Sons, Ltd.

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Storage-discharge relationships at different catchment scales based on local high-precision gravimetry

Cited by 40 publications

References 104 publications

Improvement of density models of geological structures by fusion of gravity data and cosmic muon radiographies

Improvement of density models of geological structures by fusion of gravity data and cosmic muon radiographies

Water storage changes as a marker for base flow generation processes in a tropical humid basement catchment (Benin): Insights from hybrid gravimetry

The relative contributions of alpine and subalpine ecosystems to the water balance of a mountainous, headwater catchment

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