Spatio-temporal variations in MRS signal near a temporary pond in the sahel**

Marie Boucher; Guillaume Favreau; Anatoly Legchenko; Julia Pfeffer; Yahaya Nazoumou; J Hinderer

doi:10.3997/2214-4609.20144406

Spatio-temporal variations in MRS signal near a temporary pond in the sahel**

Marie Boucher, Guillaume Favreau, Anatoly Legchenko, Julia Pfeffer, Yahaya Nazoumou, J Hinderer

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

The deep percolation below temporary ponds in the Sahel (semi-arid West Africa) is a major source of aquifer recharge. The aim of this study is to assess the ability of the magnetic resonance sounding (MRS) method to help quantify temporal changes in groundwater storage near ponds in a sedimentary porous aquifer. In the well-documented Wankama site, a magnetic resonance tomography (MRT) with 8 coincident loops was carried out during the dry season and the MRS signal was monitored as close as possible from the pond (6 measurements from 2008 to 2010). The MRT shows 1) ranges of water content in agreement with previous observations (absolute gravimetry and pumping tests) and 2) smooth lateral heterogeneities in the water content distribution. These heterogeneities were taken into account for modelling the response of MRS to water table fluctuations observed in a series of piezometers. It was shown that the detection by MRS of changes in piezometric levels is limited by the accuracy of measurements. A significant increase in MRS amplitude was observed for extremely wet conditions, partially due to the presence of the pond at the edge of the MRS loop.

Original language	English
Title of host publication	Near Surface 2011 - 17th European Meeting of Environmental and Engineering Geophysics
Place of Publication	Leicester
Publisher	Conference Organising Committee
Pages	-
Edition	To be checked
DOIs	https://doi.org/10.3997/2214-4609.20144406
Publication status	Published - 2011
Event	17th European Meeting of Environmental and Engineering Geophysics, Near Surface 2011 - Leicester Duration: 1 Jan 2011 → …

Conference

Conference	17th European Meeting of Environmental and Engineering Geophysics, Near Surface 2011
Period	1/01/11 → …
Other	12 September 2011 through 14 September 2011

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Cite this

@inproceedings{64d8ad87ec4342afac4050477f22f5b8,

title = "Spatio-temporal variations in MRS signal near a temporary pond in the sahel**",

abstract = "The deep percolation below temporary ponds in the Sahel (semi-arid West Africa) is a major source of aquifer recharge. The aim of this study is to assess the ability of the magnetic resonance sounding (MRS) method to help quantify temporal changes in groundwater storage near ponds in a sedimentary porous aquifer. In the well-documented Wankama site, a magnetic resonance tomography (MRT) with 8 coincident loops was carried out during the dry season and the MRS signal was monitored as close as possible from the pond (6 measurements from 2008 to 2010). The MRT shows 1) ranges of water content in agreement with previous observations (absolute gravimetry and pumping tests) and 2) smooth lateral heterogeneities in the water content distribution. These heterogeneities were taken into account for modelling the response of MRS to water table fluctuations observed in a series of piezometers. It was shown that the detection by MRS of changes in piezometric levels is limited by the accuracy of measurements. A significant increase in MRS amplitude was observed for extremely wet conditions, partially due to the presence of the pond at the edge of the MRS loop.",

author = "Marie Boucher and Guillaume Favreau and Anatoly Legchenko and Julia Pfeffer and Yahaya Nazoumou and J Hinderer",

year = "2011",

doi = "10.3997/2214-4609.20144406",

language = "English",

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booktitle = "Near Surface 2011 - 17th European Meeting of Environmental and Engineering Geophysics",

publisher = "Conference Organising Committee",

edition = "To be checked",

note = "17th European Meeting of Environmental and Engineering Geophysics, Near Surface 2011 ; Conference date: 01-01-2011",

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Boucher, M, Favreau, G, Legchenko, A, Pfeffer, J, Nazoumou, Y & Hinderer, J 2011, Spatio-temporal variations in MRS signal near a temporary pond in the sahel**. in Near Surface 2011 - 17th European Meeting of Environmental and Engineering Geophysics. To be checked edn, Conference Organising Committee, Leicester, pp. -, 17th European Meeting of Environmental and Engineering Geophysics, Near Surface 2011, 1/01/11. https://doi.org/10.3997/2214-4609.20144406

Spatio-temporal variations in MRS signal near a temporary pond in the sahel**. / Boucher, Marie; Favreau, Guillaume; Legchenko, Anatoly et al.
Near Surface 2011 - 17th European Meeting of Environmental and Engineering Geophysics. To be checked. ed. Leicester: Conference Organising Committee, 2011. p. -.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Spatio-temporal variations in MRS signal near a temporary pond in the sahel**

AU - Boucher, Marie

AU - Favreau, Guillaume

AU - Legchenko, Anatoly

AU - Pfeffer, Julia

AU - Nazoumou, Yahaya

AU - Hinderer, J

PY - 2011

Y1 - 2011

N2 - The deep percolation below temporary ponds in the Sahel (semi-arid West Africa) is a major source of aquifer recharge. The aim of this study is to assess the ability of the magnetic resonance sounding (MRS) method to help quantify temporal changes in groundwater storage near ponds in a sedimentary porous aquifer. In the well-documented Wankama site, a magnetic resonance tomography (MRT) with 8 coincident loops was carried out during the dry season and the MRS signal was monitored as close as possible from the pond (6 measurements from 2008 to 2010). The MRT shows 1) ranges of water content in agreement with previous observations (absolute gravimetry and pumping tests) and 2) smooth lateral heterogeneities in the water content distribution. These heterogeneities were taken into account for modelling the response of MRS to water table fluctuations observed in a series of piezometers. It was shown that the detection by MRS of changes in piezometric levels is limited by the accuracy of measurements. A significant increase in MRS amplitude was observed for extremely wet conditions, partially due to the presence of the pond at the edge of the MRS loop.

AB - The deep percolation below temporary ponds in the Sahel (semi-arid West Africa) is a major source of aquifer recharge. The aim of this study is to assess the ability of the magnetic resonance sounding (MRS) method to help quantify temporal changes in groundwater storage near ponds in a sedimentary porous aquifer. In the well-documented Wankama site, a magnetic resonance tomography (MRT) with 8 coincident loops was carried out during the dry season and the MRS signal was monitored as close as possible from the pond (6 measurements from 2008 to 2010). The MRT shows 1) ranges of water content in agreement with previous observations (absolute gravimetry and pumping tests) and 2) smooth lateral heterogeneities in the water content distribution. These heterogeneities were taken into account for modelling the response of MRS to water table fluctuations observed in a series of piezometers. It was shown that the detection by MRS of changes in piezometric levels is limited by the accuracy of measurements. A significant increase in MRS amplitude was observed for extremely wet conditions, partially due to the presence of the pond at the edge of the MRS loop.

U2 - 10.3997/2214-4609.20144406

DO - 10.3997/2214-4609.20144406

M3 - Conference contribution

SP - -

BT - Near Surface 2011 - 17th European Meeting of Environmental and Engineering Geophysics

PB - Conference Organising Committee

CY - Leicester

T2 - 17th European Meeting of Environmental and Engineering Geophysics, Near Surface 2011

Y2 - 1 January 2011

ER -

Spatio-temporal variations in MRS signal near a temporary pond in the sahel**

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