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Authie (river)
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Authie (river)
The Authie (French pronunciation: [o.ti] ⓘ; Picard: Eutie; (West Flemish: Otie)) is a river in northern France whose 108-kilometre (67 mi) course crosses the departement of the Pas-de-Calais and the Somme. Its source is near the village of Coigneux. It flows through the towns of Doullens, Auxi-le-Château, Nempont-Saint-Firmin and Nampont, finally flowing out into the Channel near Berck.
Its steady flow has attracted mankind for many centuries, developing an agricultural environment that is still dominant today. The valley of the Authie, with many towns, villages, abbeys and chateaux, holds a rich architectural heritage alongside the banks of the river, while the river mouth forms a sizeable bay between Fort-Mahon-Plage and Berck, typical of Picardy estuaries. The area is home to a diverse range of flora and fauna.
The origin of the name Authie has not been established with any certainty. A possibility is the pre-Celtic word *atur, meaning "river". It was known in Latin as Alteia.
Many waterways’ names, such as the Adour, originate from the Celtic term alt, meaning "deep" and that could refer to the steep-sided bed of the river. Another suggestion stems from the Latin word attegia designating groups of fishermen and lumberjacks living by any river.
The Authie takes its source from Coigneux at an altitude of 131 meters (430 ft), passes by the town of Authie and travels in a west - northwest direction based on the general tectonic orientation of the river currents of the area (Somme, Canche). It receives the intake of its first notable tributary, the Quilliene, at Thièvres. The river then goes to Doullens, where it converges with its main tributary (the Grouche), followed by Auxi-le-Château, and then Argoules and Nampont to the north of the forest of Crécy, before it flows into the English Channel between Fort-Mahon-Plage and Berck. Entering the Marquenterre, as a result of small tributaries, particularly the Fliers, the Authie bends its course towards the southeast, then forms, at Groffliers, an estuary. Its course separates, shortly after Auxi-le-Château, the departments of the Somme and Pas-de-Calais.
The Authie cuts into the wide plateau sloped towards the west that contains Artois and Ponthieu; a small layer of Pleistocene silt covers the flint clay and a base of chalk. The chalk appears on the slopes of the coastal river valley that cuts into it, while the bottom of the valley is made up of alluvium.
The profile along the river is rather consistent and characterized by a small slope of average (1%), more intense upstream of Doullens (2.3%), and not more than 0.4% downstream of Dompierre-sur-Authie making the Authie a slow flowing stream.
The course of the river can be divided into several parts:
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Authie (river)
The Authie (French pronunciation: [o.ti] ⓘ; Picard: Eutie; (West Flemish: Otie)) is a river in northern France whose 108-kilometre (67 mi) course crosses the departement of the Pas-de-Calais and the Somme. Its source is near the village of Coigneux. It flows through the towns of Doullens, Auxi-le-Château, Nempont-Saint-Firmin and Nampont, finally flowing out into the Channel near Berck.
Its steady flow has attracted mankind for many centuries, developing an agricultural environment that is still dominant today. The valley of the Authie, with many towns, villages, abbeys and chateaux, holds a rich architectural heritage alongside the banks of the river, while the river mouth forms a sizeable bay between Fort-Mahon-Plage and Berck, typical of Picardy estuaries. The area is home to a diverse range of flora and fauna.
The origin of the name Authie has not been established with any certainty. A possibility is the pre-Celtic word *atur, meaning "river". It was known in Latin as Alteia.
Many waterways’ names, such as the Adour, originate from the Celtic term alt, meaning "deep" and that could refer to the steep-sided bed of the river. Another suggestion stems from the Latin word attegia designating groups of fishermen and lumberjacks living by any river.
The Authie takes its source from Coigneux at an altitude of 131 meters (430 ft), passes by the town of Authie and travels in a west - northwest direction based on the general tectonic orientation of the river currents of the area (Somme, Canche). It receives the intake of its first notable tributary, the Quilliene, at Thièvres. The river then goes to Doullens, where it converges with its main tributary (the Grouche), followed by Auxi-le-Château, and then Argoules and Nampont to the north of the forest of Crécy, before it flows into the English Channel between Fort-Mahon-Plage and Berck. Entering the Marquenterre, as a result of small tributaries, particularly the Fliers, the Authie bends its course towards the southeast, then forms, at Groffliers, an estuary. Its course separates, shortly after Auxi-le-Château, the departments of the Somme and Pas-de-Calais.
The Authie cuts into the wide plateau sloped towards the west that contains Artois and Ponthieu; a small layer of Pleistocene silt covers the flint clay and a base of chalk. The chalk appears on the slopes of the coastal river valley that cuts into it, while the bottom of the valley is made up of alluvium.
The profile along the river is rather consistent and characterized by a small slope of average (1%), more intense upstream of Doullens (2.3%), and not more than 0.4% downstream of Dompierre-sur-Authie making the Authie a slow flowing stream.
The course of the river can be divided into several parts:
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