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Internal structure and development of an aeolian river dune in The Netherlands, using 3-D interpretation of ground-penetrating radar data

Published online by Cambridge University Press:  01 April 2016

R.L. Van Dam
R.L. Van Dam*
Affiliation:
Netherlands Institute of Applied Geoscience TNO, PO Box 6012, 2600 JA Delft, The Netherlands
*
Currently at: Geopuls, Bemuurde Weerd o.z. 7, 3514 AN Utrecht, The Netherlands; e-mail:[email protected]

Abstract

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Ground-penetrating radar data from a regular grid are used to study the internal structure and development of a 9-m high aeolian river dune in the Dutch Rhine-Meuse delta. The purpose of this investigation was to image the internal sedimentary structures to better understand the development of these aeolian river dunes. Three radar facies can be recognised in the GPR sections. Radar facies 1 has a maximum thickness of 5 to 6 m and is characterised by dipping, parallel reflections with a maximum length of at least 20 m. The reflections from perpendicular sections, analysed using closed-loop correlation in 3-D-interpretation software, form eastward dipping (14° maximum) surfaces. Radar facies 2 is one continuous, sub-horizontal reflection. This high amplitude reflection is most probably caused by a thin organic horizon. Radar facies 3 has a thickness of 3 to 4 m and is made up of sets of short, predominantly eastward to north-eastward dipping reflections separated by rather continuous, sub-horizontal reflections. The eastward dipping surfaces in radar facies 1 are foresets of a dune that was deposited by prevailing westerly winds in the Younger Dryas, the last cold period in the Pleistocene. During the Early Holocene, an increasing vegetation cover stabilised the dune and formed a thin organic horizon. Subsequent resumption of dune forming processes led to the formation of radar facies 3 on top of the vegetated Pleistocene dune. Sedimentation by small dunes, partly eroding each other, led to sets of cross-stratification separated by bounding surfaces. The results suggest a small change in palaeo wind direction.

Keywords

aeolianground-penetrating radarpalaeo wind directionRhine-Meuse deltathree-dimensional imaging
Type
Regular Papers
Information
Netherlands Journal of Geosciences , Volume 81 , Issue 1 , March 2002 , pp. 27 - 37
Copyright
Copyright © Stichting Netherlands Journal of Geosciences 2002

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