Un espace de liberté pour la Loire et l'Allier : de la détermination géomorphologique à la gestion / Optimum streamways for the Loire and Allier

Bazin, Patrick; Gautier, Emmanuelle

doi:10.3406/geoca.1996.4355

Cited by 13 publications

(8 citation statements)

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“…El uso de esta cartografía para identificar el espacio fluvial, está académicamente aceptado (Ollero et al, 2009) y se ha empleado en los ríos Allier en Francia (Bazin & Gautier, 1996), Arga y Aragón en Navarra (Gobierno de Navarra, 2010) y Odra en Burgos (Fernández et al, 2015). Sin embargo, su uso se complementa con otros criterios que no han sido considerados en el presente trabajo.…”

Section: B) Definición Del Espacio Fluvial Urbanounclassified

Ríos y ciudades: análisis de los usos del suelo en el espacio fluvial de las áreas urbanas españolas

Vian

Izquierdo

2021

BAGE

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En el presente artículo se analizan los usos del suelo existentes en las zonas de inundación frecuente de las áreas urbanas españolas. Estos se clasifican en grupos, distinguiendo las coberturas naturales de las antrópicas y, dentro de ellas, los usos compatibles y no compatibles con las inundaciones fluviales. El análisis realizado determina y compara el reparto de usos en el espacio fluvial y en las áreas urbanas, estudiando la ocupación de los ríos según la región biogeográfica a la que pertenecen y su temporalidad de flujo. Los resultados muestran que (1) los ríos en las ciudades son potenciales infraestructuras verdes donde abundan las coberturas naturales, espacios ajardinados, agrícolas y ganaderos; (2) se ha ocupado casi tres cuartas partes del espacio fluvial en las áreas urbanas; y (3) la presión antrópica es mayor en los ríos de la región mediterránea y, sobre todo, en los cursos de caudal intermitente. Este trabajo, pone de manifiesto la falta de una ordenación territorial coherente con los espacios fluviales y puede ser útil para contribuir a una sistematización metodológica que permita ampliar y contrastar el conocimiento de esta línea científica.

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Section: B) Definición Del Espacio Fluvial Urbanounclassified

Ríos y ciudades: análisis de los usos del suelo en el espacio fluvial de las áreas urbanas españolas

Vian

Izquierdo

2021

BAGE

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“…Even if outcomes are successful, long-term disruption of the ecological functionality from the construction work need to be considered. Alternatively, this disturbance in the system can also be seen as part of the dynamic change to a river system and can lead to succession processes in vegetation and therefore enhance the entire ecological situation 32 .…”

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The third dimension in river restoration: how anthropogenic disturbance changes boundary conditions for ecological mitigation

Guzelj

Hauer

Egger

2020

Sci Rep

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the goals of the european Water framework Directive changed the perspective on rivers from human to ecosystem-based river management. After decades of channelizing and damming rivers, restoration projects are applied with more or less successful outcomes. The anthropogenic influence put on rivers can change their physical parameters and result in a different morphological type of river. Using the Ammer River as an example, a comparison between applied systems of corridor determination based on historical maps and data; calculation of regime width; and the change in parameters and river typology are pointed out. the results showed (a) a change in stream power and morphology (b) great difference between the historical and the predicted river type and (c) that regulated rivers can have a near-natural morphology. More than two thirds of rivers worldwide are highly impacted by human interference 1 .The impact of urbanization on rivers has been described and identified as the "urban stream syndrome" 2. Some of the main impacts during the last decades are protection and mitigation measures against flooding or land erosion 3-5. As a result, rivers were channelized and/or straightened to be able to "control" water discharge in case of flooding 1,6 with the highest priority being the creation of dams and levees 7. For example, in Germany or in the USA, only about 2[%] of water bodies are still in a natural state 8,9. Additionally, rivers have been used for water supply; transforming kinetic energy to electrical power 10 ; transportation; and drainage of former wetlands for use for agriculture or settlements. All these factors have significant impacts on river morphology and ecological integrity of rivers 10-13. However, when planning the use of water bodies for human needs ecological impacts were rarely considered 8. With the introduction of the European Water Framework Directive (WFD) a need to focus on a broader spectrum of functions of rivers is given as a good ecological status (GES) for rivers 14 is requested with a basin wide approach 15-17. As a higher level of water quality is required by 2021 (or 2027 at the latest 15), restoration projects are taking place all through Europe. Despite EU directives, cultural differences in restoration trends have been observed throughout Europe 18. Different restoration approaches 19 had been developed on reach-scale or smallscale basis, and established in the past 19-23 , with most following the theory that habitat heterogeneity leads to a higher biodiversity. However, this theory was rarely a consideration in the short or mid-term perspective 10,24,25. According to Shields 26 , small-scale restorations have a higher social acceptance than large-scale restorations, and are more cost effective, while reach-scaled projects show better ecological results related to river rehabilitation. Monitoring showed that not every rehabilitation method is suitable for every morphological type of river 24,26-28. Measures being successful in the trout region may have not the same effect in lowlan...

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“…En termes de style fluvial, ce tronçon n'appartient pas à une classification particulière. Le lit mineur, enserré dans des digues insubmersibles (les levées) détermine une Loire « corsetée », rectiligne et parsemée d'île (Bazin et Gautier, 1996).…”

Section: Contexte Géologique Et Données Hydrologiquesunclassified

La dynamique du paysage et de l’occupation humaine entre Loire et Cisse

Thonniet¹,

Rigot

2016

norois

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Cet article s'attache à présenter les premiers résultats d'une étude sur la dynamique des paysages et de l'occupation humaine sur le temps long dans une portion de la plaine alluviale de la Loire. Le secteur choisi pour cette recherche est le val de Cisse. Ce type de milieu présente l'intérêt de regrouper un certain nombre de problématiques liées à l'occupation de la vallée : insertion des riverains et mise en place des activités économiques dans un espace sensible, prise en compte des conditions hydriques, aménagements, exposition au risque d'inondation. Par ailleurs, il s'agit d'un espace marqueur de l'évolution du milieu. L'analyse des documents d'archives, des données archéologiques, des données cartographiques et des données géomorphologiques, dans une perspective géoarchéologique, fournit une première approche des modalités d'occupation et d'exploitation du sol depuis le Néolithique. L'occupation ancienne, pérenne, mais lâche et concentrée dans des secteurs protégés, témoigne d'une appropriation de l'espace essentiellement centrée sur la mise en valeur agricole. Dans la partie aval du val en particulier, l'absence de bourg confirme la déconnexion entre l'espace exploité et les lieux de l'occupation humaine et suggère la présence ancienne d'une zone d'expansion des crues de la Loire.

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Un espace de liberté pour la Loire et l'Allier : de la détermination géomorphologique à la gestion / Optimum streamways for the Loire and Allier

Cited by 13 publications

References 0 publications

Ríos y ciudades: análisis de los usos del suelo en el espacio fluvial de las áreas urbanas españolas

Ríos y ciudades: análisis de los usos del suelo en el espacio fluvial de las áreas urbanas españolas

The third dimension in river restoration: how anthropogenic disturbance changes boundary conditions for ecological mitigation

La dynamique du paysage et de l’occupation humaine entre Loire et Cisse

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