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Longitudinal training dams mitigate effects of shipping on environmental conditions and fish density in the littoral zones of the river Rhine

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Published on 01/04/2018 by F.P.L. Collas, A.D. Buijse, L. van den Heuvel, N. van Kessel, M.M. Schoor, H. Eerden, R.S.E.W. Leuven

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Frank Collas

Radboud University Nijmegen

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Abstract

The stability of habitat conditions in littoral zones of navigated rivers is strongly affected by shipping induced waves and water displacements. In particular, the increase of variability in flow conditions diminishes the suitability of these habitats for juvenile fishes. Recently, a novel ecosystem based river management strategy has resulted in the replacement of traditional river training structures (i.e., groynes) by longitudinal training dams (LTDs), and the creation of shore channels in the river Waal, the main, free-flowing and intensively navigated distributary of the river Rhine in the Netherlands. It was hypothesized that these innovative LTDs mitigated the effects of shipping on fishes by maintaining the natural variability of habitat conditions in the littoral zones during ship passages whereby shore channels served as refugia for juvenile fishes. Measurements of abiotic conditions showed a significantly lower water level fluctuation and significantly higher flow stability in shore channels compared to groyne fields. Flow velocity did not differ, nor did the variation in flow velocity fluctuation during ship passage between these habitats. Densities of fish were found to be significantly higher in the littoral zones of shore channels compared to nearby groyne fields. Moreover, electrofishing along the inner side of the newly constructed LTD showed a significant linear relationship between fish density and distance from highly dynamic in- and outflow sections and to lowered inflow sections in the LTD. Results of our field sampling clearly indicate successful ecological rehabilitation of littoral zones that coincides with a facilitation of navigation in the main river channel and increased flood safety.

© 2017 Elsevier B.V. All rights reserved.

Graphical abstract of this publication (Source: Collas et al. 2018)

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Reports

  • Collas, F.P.L., van Kessel, N, van den Heuvel, L., Buijse, A.D. & Leuven, R.S.E.W. (2016). Langsdammen Waal: Resultaten vismonitoring 2016. Verslagen Milieukunde 548, Radboud Universiteit, Nijmegen, Nederland.
  • Collas, F.P.L., van Kessel, N, Thunnissen, N.W., Schoor, M., Buijse, A.D. & Leuven, R.S.E.W. (2016). Langsdammen Waal: Additionele vismonitoring oktober 2016. Verslagen Milieukunde 550, Radboud Universiteit, Nijmegen, Nederland.

Related outputs

Predicting effects of ship-induced changes in flow velocity on native and alien molluscs in the littoral zone of lowland rivers

12/11/2018 by Remon Koopman et al.

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Contains: Publication open access

Sensitivity of native and alien freshwater bivalve species in Europe to climate-related environmental factors

23/05/2018 by Frank Collas et al.

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Contains: Dataset upon request

Last modified: 29/01/2019