OL’ ’ MAN RIVER. GEO-ARCHAEOLOGICAL ASPECTS OF RIVERS AND RIVER PLAINS, Ghent Academia Press, 2009, p 510-518, 2009
Caractérisée par des pentes faibles, un sol souvent imperméable et traversée par Oued Majerda, le... more Caractérisée par des pentes faibles, un sol souvent imperméable et traversée par Oued Majerda, le cours le plus grand de la Tunisie, la plaine de Jendouba-Bou Salem, a été à plusieurs reprises, envahie par les eaux des fortes pluies. Le risque des inondations n'y est pas nouveau; mais sa fréquence et l'ampleur de ses dégâts semblent avoir augmenté au cours des dernières années. L'Homme a joué un rôle important dans cette évolution. De fait, les changements d'occupation des terres sont à l'origine d'une modification profonde de la géomorphologie des oueds et des terrains qui les jouxtent. En témoignent le retrait parfois impressionnant des berges ainsi que le changement des trajectoires des cours d'eau et surtout la mise en place d'importantes accumulations sédimentaires bien visibles dans le paysage. Des illustrations expressives ont été relevées lors des évènements les plus récents de mai 2000 et surtout celui de janvier-février 2003. D'autres indices d'instabilité des lits à l'occasion des crues ont été révélés par une étude comparée des documents cartographiques et photographiques de différentes dates.
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Key-words: Mid-Medjerda (Tunisia), inundation risk, geodynamic activity, geoarchaeology, socio-environmental impacts, geodynamic.
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On September 23, 2009 and by the end of the night, 150 mm of rain suddenly fell in the Redeyef region. This precipitation generated abundant urban runoffs and very violent floods in the Dakhla wadi (5.74 km2 upstream of Redeyef) and its tributaries (total area of 14.8 km2 downstream of the city). The runoffs and floods produced victims and caused significant damages. Despite limited knowledge about rainfall and lack of hydrological data, the present study focusses on the event mentioned above. It purports to investigate the connection, through the use of field data collected and the mapping of flooded areas, between the pluvio-hydrological conditions, the extension of the urban fabric, and developments influencing the flows. The September 23, 2009 exceptional floods in the Redeyef region, represent an example of the risks to which the localities bordering a wadi in an arid environment are exposed.
KEY-WORDS : exceptional rainfall, torrential flows, catastrophic flooding, anarchic urbanisation, Redeyef, Tunisia.
Key-words: Mid-Medjerda (Tunisia), inundation risk, geodynamic activity, geoarchaeology, socio-environmental impacts, geodynamic.
On September 23, 2009 and by the end of the night, 150 mm of rain suddenly fell in the Redeyef region. This precipitation generated abundant urban runoffs and very violent floods in the Dakhla wadi (5.74 km2 upstream of Redeyef) and its tributaries (total area of 14.8 km2 downstream of the city). The runoffs and floods produced victims and caused significant damages. Despite limited knowledge about rainfall and lack of hydrological data, the present study focusses on the event mentioned above. It purports to investigate the connection, through the use of field data collected and the mapping of flooded areas, between the pluvio-hydrological conditions, the extension of the urban fabric, and developments influencing the flows. The September 23, 2009 exceptional floods in the Redeyef region, represent an example of the risks to which the localities bordering a wadi in an arid environment are exposed.
KEY-WORDS : exceptional rainfall, torrential flows, catastrophic flooding, anarchic urbanisation, Redeyef, Tunisia.