Dordogne river dordogne

The Dordogne (Occitan: Dordonha) is a river in south-central and southwest France.

Contrary to appearances, the name of the Dordogne is not a recent word resulting from the names of the Dore and the Dogne. It comes from an ancient Durānius, dérived from a Pre-Celtic root dur-, dor- (as the Durance).

The medieval forms adopted a redoubled suffix -ononia: Dorononia fluvius (sixth century), DornoniaDordonia (ninth century) by a phenomenon of dissimilation, giving the impression of an etymology *Dore-Dogne.

The Dordogne is one of the few rivers in the world that exhibits the phenomenon known as a tidal bore.

The upper valley of the Dordogne is a series of deep gorges. The cliffs, steep banks, fast flowing water and high bridges attract both walkers and drivers. In several places the river is dammed to form long, deep lakes. Camp sites and holiday homes have proliferated wherever the valley floor is wide enough to accommodate them

Below Argentat and around Beaulieu-sur-Dordogne, the valley widens to accommodate fertile farmland, well-watered pasture and orchards. In the towns, which are major tourist attractions because of their history and architecture, the quaysides are lined with eating and drinking places. In Périgord, the valley widens further to encompass one of France's main gastronomic regions, with vineyards, poultry farms and truffle-rich woodlands.

The main season for tourism in the Valley of the Dordogne is from June to September with July and August being high season. The lifestyle and culture of the Dordogne valley attracts both visitors and incomers from all over France, but also from many other countries, particularly Britain and Germany.

The Mascaret / Tidal bore

A tidal bore (or simply bore in context, or also aegir, eagre, or eygre) is a tidal phenomenon in which the leading edge of the incoming tide forms a wave (or waves) of water that travel up a river or narrow bay against the direction of the river or bay's current. As such, it is a true tidal wave (not to be confused with a tsunami).

Bores occur in relatively few locations worldwide, usually in areas with a large tidal range (typically more than 6 metres (20 ft) between high and low water), and where incoming tides are funneled into a shallow, narrowing river via a broad bay. The funnel-like shape not only increases the tidal range, but it can also decrease the duration of the flood tide, down to a point where the flood appears as a sudden increase in the water level. Note the tidal bore takes place during the flood tide and never during the ebb tide.

A tidal bore may take on various forms, ranging from a single breaking wavefront with a roller — somewhat like a hydraulic jump — to ‘undular bores’, comprising a smooth wavefront followed by a train of secondary waves (whelps). Large bores can be particularly dangerous for shipping, but also present opportunities for river surfing.

Two key features of a tidal bore are the intense turbulence and turbulent mixing generated during the bore propagation, as well as its rumble noise. The visual observations of tidal bores highlight the turbulent nature of the surging waters. The tidal bore induces a strong turbulent mixing in the estuarine zone, and the effects may be felt along considerable distances. The velocity observations indicate a rapid deceleration of the flow associated with the passage of the bore as well as large velocity fluctuations. A tidal bore creates a powerful roar that combines the sounds caused by the turbulence in the bore front and whelps, entrained air bubbles in the bore roller, sediment erosion beneath the bore front and of the banks, scouring of shoals and bars, and impacts on obstacles. The bore rumble is heard far away because its low frequencies can travel over long distances. During his expedition in the Qiantang River mouth, Captain Moore heard the first murmur of the tidal bore one hour before it reached his Pandora ship. The low-frequency sound is a characteristic feature of the advancing roller in which the air bubbles entrapped in the large-scale eddies are acoustically active and play the dominant role in the rumble sound generation.

The word bore derives through Old English from the Old Norse word bára, meaning a wave or swell.

You can enjoy our Mascaret from the dikes in August & September: upload & print the agenda !

Banniere 2 gb



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