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Numerical Study of the Variations of Magnetic Resonance Signals Caused by Surface Slope by J.-F. Girard; A. Legchenko; M. Boucher; J.-M. Baltassat is a Earth and Planetary Sciences article available to read on EtoBox.

What is Numerical Study of the Variations of Magnetic Resonance Signals Caused by Surface Slope about?

When performing forward modelling and inversion of Magnetic Resonance Sounding (MRS) data, the watercontent distribution is typically assumed to be horizontal (1D case). This assumption is fully justified because MRS is often used for characterizing continuous aquifers in a nearly flat environment. However, MRS can also be used in areas with sharp topographical variations. Following a review of the standard MRS equations when using a coincident transmitter/receiver loop, the mathematical terms potentially affected by tilting of the loop are discussed. We present the results of a numerical modelling exercise, studying a case where the surface is not horizontal and the loop cannot be considered to be parallel to the top of the aquifer. This shows that maximum variations in the MRS-signal amplitude are caused mainly by north-or south-dipping slopes. Slope effects depend on the loop size (a larger loop produces a larger error) especially in the presence of shallow water. With a geomagnetic-field inclination of 65°and a slope angle ≤10°, the topography causes a maximum variation in amplitude of less than 10%. Near magnetic poles and equator, the slope effect is lower and undetectable in

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Author

J.-F. Girard; A. Legchenko; M. Boucher; J.-M. Baltassat

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0926-9851)

Published

2008

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)