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Géographie des risques environnementaux liés aux transports routiers en montagne. Incidences des emissions d'oxydes d'azote en vallées d'Aspe et de Biriatou (Pyrénées)

Abstract : The purpose of this thesis is to evaluate the impact of road pollution on moutain ecosystems and show that geographic approach is complementary to that of the chemists or biologists. Two valleys have been chosen for field studies : sites at Biriatou/Saint-Jean-de-Luz, an international corridor confronted with considerable growth in heavy vehicle traffic – more than 7500 trucks per day in 2000 ; and in the Aspe valley, to assess the situation before the opening of the new international road tunnel of the Somport. Road atmospheric pollution studies raises many methodological difficulties. To study the effects of this pollution, it must be first charted. We describe the model of spatial diffusion of pollution used. The studied pollutant is nitrogen dioxide (NO2) because it contributes, with the other nitrogen compounds, to acidification and eutrophisation of water and soils. The method integrates topography. We have established a cartography of nitorgen deposits for the two studied sectors. Then, this thesis talk about impacts. The evaluation of the deposition is not sufficient to determine the risk. Each ecosystem has specific characteristics (buffer capacity of soil, type of vegetation). The critical loads differ according to the environmental conditions. The definition of the risks areas needs the comparison of the levels of pollution and environmental conditions. The methodology used showed that the environmental risks of the road traffic is real, even when the traffic is weak, according to dispersion possibility.
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Contributor : Gaelle Deletraz <>
Submitted on : Thursday, September 18, 2003 - 9:35:02 AM
Last modification on : Friday, January 15, 2021 - 9:23:53 AM
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Gaëlle Deletraz. Géographie des risques environnementaux liés aux transports routiers en montagne. Incidences des emissions d'oxydes d'azote en vallées d'Aspe et de Biriatou (Pyrénées). Géographie. Université de Pau et des Pays de l'Adour, 2002. Français. ⟨tel-00003245⟩

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