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Assessing riparian zone impacts on water and sediment movement: a new approach

Published online by Cambridge University Press:  24 March 2014

S.D. Keesstra ,
E. Kondrlova ,
A. Czajka ,
M. Seeger  and
J. Maroulis
S.D. Keesstra*
Affiliation:
Land Degradation and Development Group, Wageningen University, Droevendaalsesteeg 4, 6708 PB Wageningen, the Netherlands
E. Kondrlova
Affiliation:
Department of Landscape Engineering and Ground Design, Faculty of Horticulture and Landscape Engineering, Slovak University of Agriculture, Hospodárska 7, 94976 Nitra, Slovakia
A. Czajka
Affiliation:
Department of Earth Sciences, University of Silesia, Bedzinska 60, 41-200 Sosnowiec, Poland
M. Seeger
Affiliation:
Land Degradation and Development Group, Wageningen University, Droevendaalsesteeg 4, 6708 PB Wageningen, the Netherlands Department of Physical Geography/Geosciences, University of Trier, D-54286, Trier, Germany
J. Maroulis
Affiliation:
Land Degradation and Development Group, Wageningen University, Droevendaalsesteeg 4, 6708 PB Wageningen, the Netherlands Australian Centre for Sustainable Catchments, University of Southern Queensland, Toowoomba, QLD 4350, Queensland, Australia
*
Email: saskia.keesstra@wur.nl.
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Abstract

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The state of river channels and their riparian zones in terms of geomorphology and vegetation has a significant effect on water and sediment transport in headwater catchments. High roughness in natural rivers due to vegetation and geomorphological attributes generate drag on flowing water. This drag will slow water discharge, which in turn influences the sediment dynamics of the flow. The impacts of changes in the management of rivers and their riparian zone (either by catchment managers or river restoration plans) impacts both up- as well as downstream reaches, and should be assessed holistically prior to the implementation of these plans.

To assess the river's current state as well as any possible changes in geomorphology and vegetation in and around the river, effective approaches to characterise the river are needed. In this paper, we present a practical approach for making detailed surveys of relevant river attributes. This methodology has the benefit of being both detailed – describing river depth, width, channel morphology, erosive features and vegetation types – but also being practical in terms of time management. This is accomplished by identifying and describing characteristic benchmark reaches (typical sites) in detail against which the remainder of the river course can be rated. Using this method, a large river stretch can be assessed in a relatively short period while still retrieving high quality data for the total river course. In this way, models with high data requirements for assessing the condition of a river course, can be parameterised without major investments on field surveys.

In a small headwater catchment (23 km2) in southwestern Poland, this field methodology was used to retrieve data to run an existing model (HEC-GeoRAS) which can assess the impact of changes in the riparian and channel vegetation and channel management on sedimentation processes and stream flow velocity. This model determines the impact of channel morphology and in-channel and riparian vegetation on stream flow and sediment transport. Using four return periods of flooding (2, 10, 20 and 100 years), two opposing channel management / morphology scenarios were run; a natural channel and a fully regulated channel. The modelling results show an increase in the effect of riparian vegetation / geomorphology with an increase in return period of the modeled peak discharge. More natural channel form and increased roughness reduces the stream flow velocity due to increasing drag from flow obstructions (vegetation and channel morphological features). The higher the flood water stage, the greater the drag due to vegetation on the floodplains of natural river reaches compared to channelised sections. Slower flow rates have an impact on sediment mobilisation and transport in the river.

Keywords

riparian vegetationwater and sediment transportchannel managementmodelling flood retention
Type
Research Article
Information
Netherlands Journal of Geosciences , Volume 91 , Issue 1-2 , September 2012 , pp. 245 - 255
Copyright
Copyright © Stichting Netherlands Journal of Geosciences 2012

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