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Assessing the Vulnerability of PeriUrban Rivers. Rapport scientifique final du projet AVuPUR (ANR-07-VULN-01)

Abstract : The aim of the AVuPUR project was to produce pieces of knowledge and simulation tools about the hydrology of periurban catchments. These catchments are particularly complex due to the juxtaposition of natural or cultivated areas, urban areas and various anthropogenic networks such as roads, sewer networks. For this reason, these catchments had been poorly studied before. In addition to fundamental understanding of the behaviour of those catchments, the project allowed the derivation of elements useful for decision makers. Two pilot catchments, belonging to long term research observatories, were considered within the AVuPUR project: the Yzeron catchment (150 km2), in the vicinity of Lyon, France, belonging to OTHU, and the Chézine catchment (34 km2), in the suburbs of Nantes, belonging to ONEVU. The first step was the description and understanding of the functioning of the catchments under study. For this purpose, we i) collected and analysed existing geographical (Geographical Information System, GIS) layers and hydrological data; ii) deployed in situ experiments to better understand the hydrological response, in particular in rural areas; iii) developed and compared various land use mapping methods, focusing on the determination of the impervious fraction and the distinction of various vegetation covers. In parallel, we developed and assessed various numerical models, simulating the hydrology of those catchments. At small scale, we proposed a new model, describing each object in the landscape. The aim is a better understanding of their functioning and the derivation of a hierarchy of the dominant objects/processes. For larger catchments, we tried to adapt existing models in order to take into account periurban catchments specificity. Model performance was assessed using indicators allowing the characterization of the impact of land use artificialisation on the water cycle, derived from data analysis. Those indicators are also relevant to quantify the vulnerability of the hydrology of those catchments to urbanization. Prospective meetings gathering the various actors on the Yzeron catchment were organised. They allowed the derivation of possible land use change scenarios in 2030. Those scenarios were introduced in hydrological models to quantify the impact on the hydrological regime and the riverbed erosion risk.
Mots-clés : AVUPUR
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  • HAL Id : hal-02596619, version 1
  • IRSTEA : PUB00034642

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Isabelle Braud, F. Branger, Katia Chancibault, C. Jacqueminet, P. Breil, et al.. Assessing the Vulnerability of PeriUrban Rivers. Rapport scientifique final du projet AVuPUR (ANR-07-VULN-01). [Rapport de recherche] irstea. 2011, pp.96. ⟨hal-02596619⟩

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