Ardèche (07) - France

 

Club de VTT de Labeaume - Randonnée des Chambons - Tanargue - 22 / 40 km + route

dimanche 26 juillet 2015

voir le tracé GPS : cliquer ici (PDF 9 Mo - afficher en 200 %) - Distance - profil : cliquer ici (PDF 1.6 Mo) - trace GPX : cliquer ici (ZIP) - KMZ

Balade sur les pentes de Taranis
Organisée pour la seconde année consécutive au départ du hameau des Chambons (commune de Borne - 07) à l'initiative du Cyclo Club du Tanargue (voir le site  :  https://sites.google.com/site/cycloclubdutanargue/ ), la  Randonnée des Chambons proposait cette année plusieurs parcours en VTT, vélo de route et Randonnée à la découverte de la Montagne Ardéchoise et plus particulièrement du Tanargue. Parmi les contreforts du Vivarais qui s'étendent vers le sud depuis les vastes plateaux du Massif Central, la montagne du Tanargue tient une place particulière en ce sens que ce massif essentiellement granitique concentre sur de courtes distances de forts contrastes de température entre un air froid en provenance du Nord et un air chaud venu de la Provence. Ces chocs thermiques sont à l’origine de phénomènes particulièrement violents appelés « épisodes cévenols ». Lorsque de l’air chaud et humide arrive de la Méditerranée toute proche, il se heurte aux contreforts froids des Cévennes. L’écart de température, qui peut-être supérieur à 10 °C en quelques kilomètres, génère une importante condensation qui se traduit par des pluies diluviennes à l’origine des crues majeures qui surviennent à l’automne et au printemps lors des équinoxes. Situé entre plusieurs vallées encaissées (la Borne, la Beaume et le Lignon), le nom de ce massif évoque l’époque celtique et notamment le dieu « Taranis » du ciel et du tonnerre dont les colères s’abattaient sur la montagne « Arga ». On dit aujourd’hui de ce massif qu’il se caractérise par un très haut degré kéraunique, c’est-à-dire une forte sensibilité à capter la foudre. Compte tenu de ces particularités climatiques, mais aussi topographiques et géologiques, le massif du Tanargue concentre toutes les attentions des météorologues. Aujourd'hui, sous un franc soleil à peine voilé en fin de matinée par quelques cirrus épars, les participants auront pu découvrir ce massif sous sa forme la plus apaisée entre vastes paysages et formidables panoramas jusqu'aux contours des lointaines Alpes.

PHOTOS

© photos : Jean-François LEGER, Mathieu MORVERAND, Frank RIVIERE, Michel VOYANT

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