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A geophysical profile at the foot of the Dutch coastal dunes near the former outlet of the ‘Old Rhine’

Published online by Cambridge University Press:  01 April 2016

A.C. Seijmonsbergen ,
D.T. Biewinga  and
A.P. Pruissers
A.C. Seijmonsbergen
Affiliation:
Institute for Biodiversity and Ecosystem Dynamics (IBED), section Computational Bio- and Physical Geography (CBPG), University of Amsterdam, Nieuwe Achtergracht 166, 1018WV Amsterdam, The Netherlands. E-mail: A.C.Seijmonsbergen@science.uva.nl
D.T. Biewinga*
Affiliation:
Adviesbureau voor Geofysica en Geologie, Prof. Brandsmaweg 15a, 8308RT Nagele, The Netherlands.
A.P. Pruissers
Affiliation:
Netherlands Institute of Applied Geoscience TNO -, National Geological Survey, P.O. Box 80015, 3508TA Utrecht, The Netherlands
*
Tel: +31 (0)527 65 21 41, fax: +31 (0)527 65 21 47, e-mail:, d.t.biewinga@hetnet.nl(corresponding author)

Abstract

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The apparent electrical conductivity of the subsurface along the Dutch coast between ‘Wassenaarse Slag’ (beach post 92.250) and north of Noordwijk aan Zee (beach post 77.750) reflects the spatial distribution of Holocene coastal deposits. Using a Geonics EM-34 a threefold division based on the mean electrical conductivity could be made in the outlet area of the River Old Rhine. 1) A section showing a sequence of sandy deposits that resembles the Schoorl Member of the Naaldwijk Formation on top of the Zandvoort Member of the Naaldwijk Formation. 2) A section underlain by a shallow clay/peat layer of varying thickness belonging to the Naaldwijk Formation (Walcheren Member) / Nieuwkoop Formation (Hollandveen Member), intercalated within the Schoorl Member and Zandvoort Member of the Naaldwijk Formation. South of the Old Rhine locally Wormer Member deposits of the Naaldwijk Formation underlie these clay/peat layers. 3) A section characterized by channel fill deposits of the former Rhine reaching to -20 m below Normaal Amsterdam Peil (N.A.P.), and belonging to deposits of the Wormer Member of the Naaldwijk Formation, and to two facies of the Naaldwijk Formation (Walcheren Member). The geophysical transect was calibrated using existing nearby drill hole data, so that a continuous snapshot of the subsurface was gained. Therefore this research also contributes to the recent genesis of this part of the Dutch coast.

Keywords

Dutch coastelectrical conductivityGeonics EM-34‘Old Rhine’
Type
Geo(Im)pulse
Information
Netherlands Journal of Geosciences , Volume 83 , Issue 4 , December 2004 , pp. 287 - 291
Copyright
Copyright © Stichting Netherlands Journal of Geosciences 2004

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