Morphodynamic effects of stone and wooden groynes in a restored river reach
Restoration works on an 11 km long reach of the Spree River near Cottbus in Germany were accomplished in 2014. The overall objective was to improve the biodiversity, changing the morphological structure from a straight single-thread river to a braiding one with reshaped thalweg, and creating zones w...
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2018-01-01
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Series: | E3S Web of Conferences |
Online Access: | https://doi.org/10.1051/e3sconf/20184002038 |
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doaj-12eed7f5300e444fb25211dba1af077f2021-02-02T03:41:58ZengEDP SciencesE3S Web of Conferences2267-12422018-01-01400203810.1051/e3sconf/20184002038e3sconf_riverflow2018_02038Morphodynamic effects of stone and wooden groynes in a restored river reachZaid BahaeldeenNardone ParideNones MichaelGerstgraser ChristophKoll KatinkaRestoration works on an 11 km long reach of the Spree River near Cottbus in Germany were accomplished in 2014. The overall objective was to improve the biodiversity, changing the morphological structure from a straight single-thread river to a braiding one with reshaped thalweg, and creating zones with varying flow velocities required for fish spawning. Several interventions were made, among which also two types of groynes were constructed along the reach: impermeable stone groynes, with an inclined crest so that only the tip is typically submerged during normal flow conditions, and wooden groynes made of several large trunks, which are mainly submerged at normal flow conditions. To compare local morphodynamic effects caused by the different types, flow velocities and bed topography were measured at distances of 12 m upstream and 16 m downstream of two selected groynes. The vertical profile was captured by measuring at five levels above the bed. Bed material was sampled at several locations around the groynes. The analysis of the measurements showed the effect of each groyne type on the flow velocity, bed topography and bed material. Furthermore, the differences in the effects of each groyne type on the flow, bed topography and bed material were highlighted.https://doi.org/10.1051/e3sconf/20184002038 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Zaid Bahaeldeen Nardone Paride Nones Michael Gerstgraser Christoph Koll Katinka |
spellingShingle |
Zaid Bahaeldeen Nardone Paride Nones Michael Gerstgraser Christoph Koll Katinka Morphodynamic effects of stone and wooden groynes in a restored river reach E3S Web of Conferences |
author_facet |
Zaid Bahaeldeen Nardone Paride Nones Michael Gerstgraser Christoph Koll Katinka |
author_sort |
Zaid Bahaeldeen |
title |
Morphodynamic effects of stone and wooden groynes in a restored river reach |
title_short |
Morphodynamic effects of stone and wooden groynes in a restored river reach |
title_full |
Morphodynamic effects of stone and wooden groynes in a restored river reach |
title_fullStr |
Morphodynamic effects of stone and wooden groynes in a restored river reach |
title_full_unstemmed |
Morphodynamic effects of stone and wooden groynes in a restored river reach |
title_sort |
morphodynamic effects of stone and wooden groynes in a restored river reach |
publisher |
EDP Sciences |
series |
E3S Web of Conferences |
issn |
2267-1242 |
publishDate |
2018-01-01 |
description |
Restoration works on an 11 km long reach of the Spree River near Cottbus in Germany were accomplished in 2014. The overall objective was to improve the biodiversity, changing the morphological structure from a straight single-thread river to a braiding one with reshaped thalweg, and creating zones with varying flow velocities required for fish spawning. Several interventions were made, among which also two types of groynes were constructed along the reach: impermeable stone groynes, with an inclined crest so that only the tip is typically submerged during normal flow conditions, and wooden groynes made of several large trunks, which are mainly submerged at normal flow conditions. To compare local morphodynamic effects caused by the different types, flow velocities and bed topography were measured at distances of 12 m upstream and 16 m downstream of two selected groynes. The vertical profile was captured by measuring at five levels above the bed. Bed material was sampled at several locations around the groynes. The analysis of the measurements showed the effect of each groyne type on the flow velocity, bed topography and bed material. Furthermore, the differences in the effects of each groyne type on the flow, bed topography and bed material were highlighted. |
url |
https://doi.org/10.1051/e3sconf/20184002038 |
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