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Alpes-de-Haute-Provence

Department in Provence-Alpes-Côte d'Azur, France

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  • 11 chapters

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Alpes-de-Haute-Provence's main cities are Digne-les-Bains (prefecture), Manosque, Sisteron, Barcelonnette, Castellane and Forcalquier. Inhabitants are called the Bas-Alpins (masculine) or Bas-Alpines (feminine) in reference to the department's former name, Basses-Alpes, which was in use until 1970. Although the prefecture is Digne-les-Bains, the largest city is Manosque. Alpes-de-Haute-Provence's INSEE and postal code is 04.

Geography

The departmental can be divided into three zones depending on the terrain, climate, population and economy:

  • the plateaux, hills and valleys of Haute-Provence, which comprise one-third of the area but two-thirds of the population and the most important cities of the department with almost all of the economic activity apart from mountain tourism. The valley of the Durance, the artery of the department, cuts the rest of the department into two parts:
  • the Lower Alps: an intermediate mountain area with valleys and very remote villages
  • the High Alps: including the valleys of Ubaye, Blanche, and the high Verdon (upstream of Colmars-les-Alpes) where the economy is built around mountain tourism (skiing). In the Haute-Ubaye, the mountain peaks exceed 3000 m above sea level and all the passes are close to or above 2000 m in altitude. In this part of the department is one of the highest roads in Europe: the main road D64 reaches an altitude of 2802 m near the Col de la Bonette (2715 m) and connects the region of Barcelonnette to the Tinée and Vésubie valleys.

The relief of the land compartmentalises the region: the enclosed valleys are difficult to access, so dividing the country into as many local areas which communicate very little with the outside. In 1877, 55 communes only had access to trails or mule paths.

The seismic hazard is moderate (zone 3) to medium (zone 4) with different faults such as the Durance located in the department.

Hydrology

The main river is the Durance which runs in the west of the department. It is in the Durance valley that the most important traffic routes are found: the A51 autoroute and the railway main line. Almost all of the department is in the watershed of the Durance except for the extreme south-east (the cantons of Annot and Entrevaux) which are drained by the Var.

The main tributaries of the Durance in the department are the Ubaye, the Bléone, the Asse, the Verdon on the left bank, the Buëch, the Jabron, and the Largue on the right bank.

The Durance and its tributaries have a torrential character, with a transition between the snow regime of the high valleys and the Mediterranean rainfall regime in the lower mountains and below. The summer low water levels are severe and violent floods occur when heavy rains fall which is often in autumn. The Durance, Verdon, Bléone and Buëch have had the construction of several dams and the diversion of parts of the river for irrigation and power generation in the 20th century.

Climate

The climate of the Alpes-de-Haute-Provence department is a Mediterranean climate degrading by altitude and latitude. In fact, while in the lower valleys and flat lands of Haute-Provence an inland Mediterranean climate prevails, by contrast in the hills it is more mixed with the valley of the Ubaye characteristic of the inner Alps, with a marked continentality: winters are very harsh with stormy summers. In between, the two influences mingle in the area of the Lower Alps. The characteristics of both climate trends are found throughout the department to a greater or lesser extent:

  • dry air and little fog (less than 20 days per year)
  • infrequent rainfall (less than 90 days per year) but heavy (650 to 1500 mm per year)
  • frequent thunderstorms in the mountains in summer
  • High sunshine hours in all seasons (2550 to 2850 hours per year)
  • high thermal amplitudes, diurnal (over 10 °C) and annual (18 °C)
  • fresh and bright winters
  • very hot summers barely tempered by altitude.

Haute-Provence is therefore of interest to European astronomers looking for a partly cloudy night sky and one not affected by light pollution. Many amateur observatories have been built, and the Observatoire de Haute-Provence is one of the largest observatories in continental Europe. It is an active astronomy research centre.

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