Geohistorical construction of the "wild" of the middle valley of the Garonne (near of Toulouse): how much of wilderness in river landscapes?

Valette, Philippe; Carozza, Jean‐Michel; Salles, Denis; David, Mélodie; Simonet, Guillaume

doi:10.4000/developpementdurable.10578

Cited by 5 publications

(9 citation statements)

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“…The transport of people and goods was facilitated in the valley, and this led to a decline in river navigation. As a consequence, public works undertaken to manage the channel decreased (Valette, 2002;Valette et al, 2014). At the same time, the water levels recorded at Toulouse (Fig.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…ecological issues (Valette and Gazelle, 2000;Muller et al, 2002;Valette, 2002;Valette and Carozza, 2010;Valette et al, 2014), have provided signs of an active-belt narrowing prior to the 1960s. In addition, a bed incision has been documented at several points in the fluvial reach since the early twentieth century (Beaudelin, 1989;Steiger et al, 1998.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…From at least the Middle Ages and until the mid-nineteenth century, the Toulouse middle Garonne was subject to river management practices for navigation improvement and/or agricultural land expansion (Valette, 2002). Numerous historical documents have shown that these actions were often ineffective owing to channel instability caused by the river's strong flood dynamics (Valette and Gazelle, 2000;Valette, 2002;Valette et al, 2014).…”

Section: Historical Changesmentioning

confidence: 99%

“…Above all, in-stream gravel mining by local tradesmen, initially intended to facilitate navigation, became systematic during the nineteenth century and later expanded. These activities in the channel thus largely reduced alluvial deposits, especially immediately downstream from Toulouse (Beaudelin, 1989;Valette, 2002;Valette et al, 2014).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…In addition to gravel mining, Valette (2002;Valette et al, 2014) has reported numerous individual works undertaken during the Modern era designed to reclaim land from the river and to concentrate water flow for navigation purposes. The construction of earth guards across secondary channels and the planting of willows to stabilize the banks may have contributed to the closing of secondary channels in zone Z3.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

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Evolutionary trajectory of channel planforms in the middle Garonne River (Toulouse, SW France) over a 130-year period: Contribution of mixed multiple factor analysis (MFAmix)

et al. 2016

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International audienceThe purpose of this study is to propose a methodological essay for defining evolutionary trajectories of channel planforms and to examine the channel change in the middle Garonne River (southwest France) over a 130-year period. The study focuses on a reach of ~90 km situated downstream from the city of Toulouse. A set of four historical maps (1868, 1940s, 1970s, and 2000s) is used to build a geomorphometric diachronic database. Data processing through mixed multiple factor analysis (MFAmix) and hierarchical cluster analysis (HCA) allows distinction between four homogeneous zones within the study reach, depending on their evolutionary trajectories. Channel behavior in the upstream and median zones evolved as of the beginning of the study period (narrowing of the fluvial area, colonization by vegetation, and removal of alluvial bars), likely owing to punctual anthropogenic actions. The downstream zone is characterized by stabilization of the channel and alluvial bar removal over the second half of the twentieth century, coinciding with the campaign undertaken by French local authorities between 1960 and 1984 to protect river banks. The role of ACCEPTED MANUSCRIPT climate transition between the Little Ice Age (LIA) and the onset of the Global Warming period (GW) is also discussed. Results generally are consistent with the chronology established for most European rivers

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Section: Accepted M Manuscriptmentioning

confidence: 99%

Section: Accepted M Manuscriptmentioning

confidence: 99%

Section: Historical Changesmentioning

confidence: 99%

Section: Accepted M Manuscriptmentioning

confidence: 99%

Section: Accepted M Manuscriptmentioning

confidence: 99%

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Evolutionary trajectory of channel planforms in the middle Garonne River (Toulouse, SW France) over a 130-year period: Contribution of mixed multiple factor analysis (MFAmix)

et al. 2016

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La Garonne à Toulouse

Valette¹

2015

norois

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Les paysages garonnais toulousains, du centre ancien jusqu'aux communes périurbaines sud et nord, sont caractérisés par une diversité de paysages luviaux liée à l'histoire des relations entre la Garonne et la ville de Toulouse. Dans le centre ancien les quais et digues (créés au xviii e siècle et xix e siècle) sont constitués de briques roses et font partie de l'identité de la ville. En amont et aval immédiats du front historique, des murs gris en béton composent un tout autre paysage (post 1950). Plus loin encore, dans les communes périurbaines, la valorisation des paysages luviaux s'exprime par des éléments ponctuels (espaces verts, aires de loisirs…). Cette diversité témoigne d'un traitement paysager différent selon les époques. Dans ce travail, il est question de caractériser les intentionnalités paysagères au cours du temps ain de mieux comprendre l'état actuel des paysages luviaux. Plusieurs types d'intentionnalités peuvent être déinis et parmi elles, nous nous intéressons plus particulièrement à l'embellissement et la valorisation des paysages luviaux urbains et périurbains. Pendant de nombreuses années, l'intentionnalité liée à l'embellissement des paysages luviaux urbains toulousains s'est concentrée dans le centre ancien. Depuis quelques années, ce processus semble s'étendre en amont et en aval du centre-ville. Actuellement, de nombreuses rélexions sont en cours autour du projet « Grand parc Garonne » mené par Toulouse Métropole (CUGT, 2012). Ce projet vise à valoriser les paysages luviaux et le patrimoine luvial du centre ancien jusque dans ces communes périurbaines. Dans ces territoires est-il possible de parler d'une intentionnalité paysagère comparable à celle que nous observons en centre-ville ? Existe-t-il une continuité dans la valorisation des paysages luviaux toulousains ?

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Understanding the Links between the Blue Network, Waterscapes and Urban Projects – Comparisons between Three Confluent Cities: Lyon, Nantes and Strasbourg

Rivière-Honegger

Servain

Armani³

et al. 2019

paysage

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Geohistorical construction of the "wild" of the middle valley of the Garonne (near of Toulouse): how much of wilderness in river landscapes?

Cited by 5 publications

References 0 publications

Evolutionary trajectory of channel planforms in the middle Garonne River (Toulouse, SW France) over a 130-year period: Contribution of mixed multiple factor analysis (MFAmix)

Evolutionary trajectory of channel planforms in the middle Garonne River (Toulouse, SW France) over a 130-year period: Contribution of mixed multiple factor analysis (MFAmix)

La Garonne à Toulouse

Understanding the Links between the Blue Network, Waterscapes and Urban Projects – Comparisons between Three Confluent Cities: Lyon, Nantes and Strasbourg

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