Socio-environmental implications of process-based restoration strategies in large rivers: should we remove novel ecosystems along the Rhône (France)?

Thorel, Maxine; Piégay, Hervé; Barthélémy, Carole; Räpple, Bianca; Gruel, Charles-Robin; Marmonier, Pierre; Winiarski, Thierry; Bedell, Jean-Philippe; Arnaud, Fanny; Roux, Gwenaëlle; Stella, John C.; Seignemartin, Gabrielle; Tena, Álvaro; Wawrzyniak, Vincent; Roux-Michollet, Dad; Oursel, Benjamin; Fayolle, Stéphanie; Bertrand, Céline; Franquet, Évelyne

doi:10.1007/s10113-018-1325-7

Cited by 32 publications

(30 citation statements)

References 45 publications

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“…1). The former sections, called the several large European rivers during the 19th century are unique water bodies that must be taken into account in restoration plans (Franquet et al, 1995;Thorel et al, 2018). Dike fields (also called groyne fields) are fairly common infrastructures created along large rivers for flood and inundation management and to promote channel erosion for navigation.…”

Section: Experimental Sitementioning

confidence: 99%

“…Because navigation now mainly occurs in large artificial waterways, those dikes built at the end of the 19th century have lost their functional utility. In Europe, there is thus a large program aiming to remove these dikes to restore lateral erosion during floods, sediments and nutrients inputs to the alluvial plain (Pont et al, 2017, Thorel et al, 2018 and to promote lateral floodplain's habitat dynamics. Such restoration programs with dikes removal and restored connectivity were already been conducted, for example in the Mississippi alluvial plain (Koontz et al, 2016) and proved to increase the productivity of forested riparian wetlands.…”

Section: Experimental Sitementioning

confidence: 99%

“…Finally, we compared chemical and biological classification of these artificial wetlands with metabolism measurements. We hypothesized convergence between these two functional approaches (López-Archilla et al, 2004) to propose strategies for restoration plans (Thorel et al, 2018).…”

Section: Experimental Sitementioning

confidence: 99%

“…Intermediate connectivity maintains an intermediate water and nutrient residence time and a diversity of habitats at the scale of a single pond. A way to maintain such an intermediate residence time is to connect adjacent dike fields to each other in order to increase the flow of water, without direct input of turbid water from the Rhône River (Thorel et al, 2018).…”

Section: Tablementioning

confidence: 99%

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Functional classification of artificial alluvial ponds driven by connectivity with the river: Consequences for restoration

Guillon

Thorel

Flipo

et al. 2019

Ecological Engineering

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Chemical and biological functioning of artificial wetlands and lakes in alluvial plains is investigated based on the example of small artificial ponds located within dike fields along the Rhône River (France). The objective is to identify the diversity of metabolism in these artificial aquatic ecosystems and to propose a functional classification linked to the connectivity with the river. A comprehensive characterization of chemical and biological parameters in six shallow ponds was conducted, along with 4-month continuous monitoring of temperature and dissolved oxygen concentration, both in the sub-surface and at depth. Metabolism intensity is quantified using the diel oxygen method. Multivariate analysis of chemical and biological characteristics is performed to identify the functional heterogeneity between the ponds, which is shown to be consistent with the intensity of primary production (GPP) and ecosystem respiration (ER). Some ponds are permanently connected to the river, like backwater, and are very turbid, because of suspended matter and the presence of phytoplankton. The oxygenation is limited to the surface layer with anoxia rapidly building up at the bottom due to an intense ER. Ponds that are rarely connected become eutrophic with large concentration of phytoplankton and large GPP and ER values. Anoxia and even denitrification occur close to the bottom sediment. Finally, in the ponds with intermediate degree of connection with the river, macrophytes grow in clear water with limited amount of phytoplankton, resulting in a gradient of GPP and ER values, controlled by nutrient availability. Rehabilitation of various connection patterns with the river is thus crucial to maintain a functional diversity in large river alluvial plains.

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Section: Experimental Sitementioning

confidence: 99%

Section: Experimental Sitementioning

confidence: 99%

Section: Experimental Sitementioning

confidence: 99%

Section: Tablementioning

confidence: 99%

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Functional classification of artificial alluvial ponds driven by connectivity with the river: Consequences for restoration

Guillon

Thorel

Flipo

et al. 2019

Ecological Engineering

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“…The concept also suggests that fluvial systems are now socioecological hybrids and that human constructions can be perceived as potentially valuable, as is discussed with the novel ecosystem concept (Hobbs et al, 2006). There is an urgent need to work on highly modified river systems and not only the most natural systems, in order to understand the physical processes and improve their functioning (Thorel et al, 2018). Fluvial geomorphologists have made considerable progress in reading the landscape , interpreting the range of past channel processes, understanding the biophysical and anthropogenic drivers of channel trajectories, and predicting future changes (Brierley et al, 2013;Wohl, 2013;Brown et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Remotely sensed rivers in the Anthropocene: state of the art and prospects

Piégay

Arnaud

Belletti

et al. 2020

Earth Surf Processes Landf

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167

103

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The rivers of the world are undergoing accelerated change in the Anthropocene, and need to be managed at much broader spatial and temporal scales than before. Fluvial remote sensing now offers a technical and methodological framework that can be deployed to monitor the processes at work and to assess the trajectories of rivers in the Anthropocene. In this paper, we review research investigating past, present and future fluvial corridor conditions and processes using remote sensing and we consider emerging challenges facing fluvial and riparian research. We introduce a suite of remote sensing methods designed to diagnose river changes at reach to regional scales. We then focus on identification of channel patterns and acting processes from satellite, airborne or ground acquisitions. These techniques range from grain scales to landform scales, and from real time scales to inter-annual scales. We discuss how remote sensing data can now be coupled to catchment scale models that simulate sediment transfer within connected river networks. We also consider future opportunities in terms of datasets and other resources which are likely to impact river management and monitoring at the global scale. We conclude with a summary of challenges and prospects for remotely sensed rivers in the Anthropocene.

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What are the Political, Social, and Economic Issues in River Restoration? Genealogy and Current Research Issues

2021

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Socio-environmental implications of process-based restoration strategies in large rivers: should we remove novel ecosystems along the Rhône (France)?

Cited by 32 publications

References 45 publications

Functional classification of artificial alluvial ponds driven by connectivity with the river: Consequences for restoration

Functional classification of artificial alluvial ponds driven by connectivity with the river: Consequences for restoration

Remotely sensed rivers in the Anthropocene: state of the art and prospects

What are the Political, Social, and Economic Issues in River Restoration? Genealogy and Current Research Issues

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