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Ground-penetrating radar profiling on embanked floodplains

Published online by Cambridge University Press:  01 April 2016

M.A.J. Bakker ,
D. Maljers  and
H.J.T. Weerts
M.A.J. Bakker*
Affiliation:
TNO Built Environment and Geosciences - Netherlands Geological Survey, Princetonlaan 6, 3508 TA Utrecht, the Netherlands
D. Maljers
Affiliation:
TNO Built Environment and Geosciences - Netherlands Geological Survey, Princetonlaan 6, 3508 TA Utrecht, the Netherlands
H.J.T. Weerts
Affiliation:
TNO Built Environment and Geosciences - Netherlands Geological Survey, Princetonlaan 6, 3508 TA Utrecht, the Netherlands
*
*Corresponding author. Email:[email protected]
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Abstract

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Management of the Dutch embanked floodplains is of crucial interest in the light of a likely increase of extreme floods. One of the issues is a gradual decrease of floodwater accommodation space as a result of overbank deposition of mud and sand during floods. To address this issue, sediment deposits of an undisturbed embanked floodplain near Winssen along the river Waal were studied using ground-penetrating radar (GPR). A number of radar facies units were recognized. Boreholes were used to relate radar facies units to sedimentary facies and to determine radar velocity. The GPR groundwave is affected by differences in moisture and texture of the top layer and probably interferes with the first subsurface reflector. The architectural elements recognized in the GPR transects confirm earlier reported insights on human-influenced river behaviour. This is testified in the development of sand bars during flood regimes that are probably more widespread than previously established.

Keywords

floodplainoverbank sedimentsGPR (ground-penetrating radar)radar facies
Type
Research Article
Information
Netherlands Journal of Geosciences , Volume 86 , Issue 1 , April 2007 , pp. 55 - 61
Copyright
Copyright © Stichting Netherlands Journal of Geosciences 2007

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