Hydromorphological conditions in eighteen restored floodplain
channels of a large river: linking patterns to processes

J 2015

Hydromorphological conditions in eighteen restored floodplain channels of a large river: linking patterns to processes

RIQUIER, Jéremie, Hervé PIÉGAY a Monika ŠULC MICHALKOVÁ

Základní údaje

Originální název

Hydromorphological conditions in eighteen restored floodplain channels of a large river: linking patterns to processes

Autoři

RIQUIER, Jéremie (250 Francie, garant), Hervé PIÉGAY (250 Francie) a Monika ŠULC MICHALKOVÁ (703 Slovensko, domácí)

Vydání

Freshwater Biology, Danvers, Blackwell Science, 2015, 0046-5070

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10501 Hydrology

Stát vydavatele

Spojené státy

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 2.933

Kód RIV

RIV/00216224:14310/15:00082641

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.1111/fwb.12411

UT WoS

000354254800002

Klíčová slova česky

povodňový režim, funkční typologie, velikost zrna, hydrologická konektivita, Rhôna

Klíčová slova anglicky

flooding regime;functional typology;grain size;hydrological connectivity;Rhône

Štítky

AKR

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 14. 6. 2018 15:17, Mgr. Monika Šulc Michalková, Ph.D. et Ph.D.

Anotace

ORIG CZ

V originále

1.Over the past few decades, numerous floodplain restoration projects have attempted to re-establish complex and diverse river floodplains. They often aim to restore lateral connectivity (i.e. interactions between the main river channel and floodplain channels) and rejuvenate floodplain habitats which are no longer maintained or created by fluvial processes. Nonetheless, results of these experiences in terms of hydromorphological conditions and adjustments are rarely shared. The Rhône River is a large, highly regulated system where lateral connectivity has been greatly reduced. We investigated habitat dynamics (using sedimentological indicators as proxies) in 18 floodplain channels that were restored between 1999 and 2006. Environmental data (bathymetry and grain size of surficial fine sediments) were acquired on 3–5 surveys for each channel covering 6–12 years after restoration. In addition, a pre-restoration survey was made in 12 of the 18 channels. Using pressure sensors in the floodplain channels and rating curves in the main channel, we quantified the upstream overflow frequency and magnitude (i.e. maximum shear stress) in the channels and tested how these variables explain observed sedimentological patterns. Between-channel diversity accounted for 81% of the sedimentological variability observed after restoration. Time-averaged sedimentological conditions were robust and well predicted from overflow frequency and magnitude. Similarly, an indirect index of lateral connectivity used by hydrobiologists was also predictable from overflow frequency and magnitude. The remaining 19% of the sedimentological variability was attributed to temporal variation within channels and was mainly related to changes in longitudinal grain size gradient. This emphasises that grain size patterns are periodically reworked as a result of the flooding regime (backflow versus overflow) without significantly affecting average grain sizes. However, trajectories of grain size changes were stochastic and not always related to the hydrological regime. Accordingly, the partial pre-restoration data suggest that post-restoration sedimentological conditions were often similar to those observed before restoration, except in a few channels where major restoration works were performed. Our results quantify how changes in upstream overflow frequency and magnitude can modify physical conditions in the floodplain channels. They can be used to design habitats that are infrequent or missing at the floodplain scale. These results also suggest that changes in upstream plug morphology are a primary habitat driver. Such changes could be more frequently implemented in the Rhône and elsewhere to maximise the diversity of physical conditions in floodplains.

Česky

Článek sleduje vývoj a hydromorfologické podmínky 18 odřezaných koryt řeky Rhôny a jejich hydrologickou konktivitu.

Citovat

RIQUIER, Jéremie, Hervé PIÉGAY a Monika ŠULC MICHALKOVÁ. Hydromorphological conditions in eighteen restored floodplain channels of a large river: linking patterns to processes. Freshwater Biology. Danvers: Blackwell Science, 2015, roč. 60, č. 6, s. 1085-1103. ISSN 0046-5070. Dostupné z: https://dx.doi.org/10.1111/fwb.12411.

@article{1232848,
   author = {Riquier, Jéremie and Piégay, Hervé and Šulc Michalková, Monika},
   article_location = {Danvers},
   article_number = {6},
   doi = {http://dx.doi.org/10.1111/fwb.12411},
   keywords = {flooding regime;functional typology;grain size;hydrological connectivity;Rhône},
   language = {eng},
   issn = {0046-5070},
   journal = {Freshwater Biology},
   title = {Hydromorphological conditions in eighteen restored floodplain channels of a large river: linking patterns to processes},
   url = {http://onlinelibrary.wiley.com/doi/10.1111/fwb.12411/abstract},
   volume = {60},
   year = {2015}
}

TY  - JOUR
ID  - 1232848
AU  - Riquier, Jéremie - Piégay, Hervé - Šulc Michalková, Monika
PY  - 2015
TI  - Hydromorphological conditions in eighteen restored floodplain channels of a large river: linking patterns to processes
JF  - Freshwater Biology
VL  - 60
IS  - 6
SP  - 1085-1103
EP  - 1085-1103
PB  - Blackwell Science
SN  - 00465070
KW  - flooding regime;functional typology;grain size;hydrological connectivity;Rhône
UR  - http://onlinelibrary.wiley.com/doi/10.1111/fwb.12411/abstract
L2  - http://onlinelibrary.wiley.com/doi/10.1111/fwb.12411/abstract
N2  - 1.Over the past few decades, numerous floodplain restoration projects have attempted to re-establish complex and diverse river floodplains. They often aim to restore lateral connectivity (i.e. interactions between the main river channel and floodplain channels) and rejuvenate floodplain habitats which are no longer maintained or created by fluvial processes. Nonetheless, results of these experiences in terms of hydromorphological conditions and adjustments are rarely shared. The Rhône River is a large, highly regulated system where lateral connectivity has been greatly reduced. We investigated habitat dynamics (using sedimentological indicators as proxies) in 18 floodplain channels that were restored between 1999 and 2006. Environmental data (bathymetry and grain size of surficial fine sediments) were acquired on 3–5 surveys for each channel covering 6–12 years after restoration. In addition, a pre-restoration survey was made in 12 of the 18 channels. Using pressure sensors in the floodplain channels and rating curves in the main channel, we quantified the upstream overflow frequency and magnitude (i.e. maximum shear stress) in the channels and tested how these variables explain observed sedimentological patterns. Between-channel diversity accounted for 81% of the sedimentological variability observed after restoration. Time-averaged sedimentological conditions were robust and well predicted from overflow frequency and magnitude. Similarly, an indirect index of lateral connectivity used by hydrobiologists was also predictable from overflow frequency and magnitude. The remaining 19% of the sedimentological variability was attributed to temporal variation within channels and was mainly related to changes in longitudinal grain size gradient. This emphasises that grain size patterns are periodically reworked as a result of the flooding regime (backflow versus overflow) without significantly affecting average grain sizes. However, trajectories of grain size changes were stochastic and not always related to the hydrological regime. Accordingly, the partial pre-restoration data suggest that post-restoration sedimentological conditions were often similar to those observed before restoration, except in a few channels where major restoration works were performed. Our results quantify how changes in upstream overflow frequency and magnitude can modify physical conditions in the floodplain channels. They can be used to design habitats that are infrequent or missing at the floodplain scale. These results also suggest that changes in upstream plug morphology are a primary habitat driver. Such changes could be more frequently implemented in the Rhône and elsewhere to maximise the diversity of physical conditions in floodplains.
ER  -

RIQUIER, Jéremie, Hervé PIÉGAY a Monika ŠULC MICHALKOVÁ. Hydromorphological conditions in eighteen restored floodplain channels of a large river: linking patterns to processes. \textit{Freshwater Biology}. Danvers: Blackwell Science, 2015, roč.~60, č.~6, s.~1085-1103. ISSN~0046-5070. Dostupné z: https://dx.doi.org/10.1111/fwb.12411.

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