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Reyran
The Reyran is a torrent of the Var department in Provence-Alpes-Côte d'Azur, France and a tributary of the Argens. It is an ephemeral stream, 26.8 km long, which originates in Bagnols-en-Forêt in the Var, 12 km from Fréjus. The Reyran flows only three months a year and can be dry the rest of the year. Its flow is very irregular. The annual rate is 22.70 million m3 and once every 30 years reaches to only 15.75 million m3. The rate is highest during the months of December, January and April. The flow rate is sometimes zero during July and August. During the summer months, the river bed may present a series of isolated ponds that decrease in size by the day. The bed of the Reyran is made of coarse sand and gravel up to 30–40 cm. Their lithology is that of surrounding rocks: sandstone, gneiss, pegmatite, volcanic rocks. Fréjus The Reyran is piped in through the city of Fréjus. A concrete canal was built after the Malpasset Dam failure. These are preventive mea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Malpasset Dam
The Malpasset Dam was an arch dam (convex surface facing upstream) on the Reyran River, north of Fréjus on the French Riviera. It collapsed on 2 December 1959, killing 423 people in the resulting flood. The breach was caused by a tectonic fault in the impermeable rock base, which had been inadequately surveyed. Nearby road-building works, using explosives, may also have contributed to the disaster. Construction The dam was a doubly curved equal angle arch type with variable radius. It was built to supply drinking and irrigation water for the region. Construction began in April 1952 and was finished in 1954. Another source reports that construction began as early as 1941. Delays due to lack of funding and labor strikes interrupted construction a few times. The project was led by well-known French engineer André Coyne. Construction cost 580 million francs (by 1955 prices), and was funded and owned by Var département. Concurrent with the dam construction, the A8 autoroute was als ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Malpasset
The Malpasset Dam was an arch dam (convex surface facing upstream) on the Reyran, Reyran River, north of Fréjus on the French Riviera. It collapsed on 2 December 1959, killing 423 people in the resulting flood. The breach was caused by a tectonic fault in the impermeable rock base, which had been inadequately surveyed. Nearby road-building works, using explosives, may also have contributed to the disaster. Construction The dam was a doubly curved equal angle arch type with variable radius. It was built to supply drinking and irrigation water for the region. Construction began in April 1952 and was finished in 1954. Another source reports that construction began as early as 1941. Delays due to lack of funding and labor strikes interrupted construction a few times. The project was led by well-known French engineer Andre Coyne, André Coyne. Construction cost 580 million francs (by 1955 prices), and was funded and owned by Var (département), Var Département in France, département ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fréjus
Fréjus (; ) is a commune in the Var department in the Provence-Alpes-Côte d'Azur region in Southeastern France. In 2019, it had a population of 54,458. It neighbours Saint-Raphaël, effectively forming one urban agglomeration. The north of the commune forms part of the Massif de l'Esterel. On 2 December 1959, the Malpasset Dam, on the Reyran River above the city of Fréjus, ruptured, killing over 400 people. History The origins of Frejus probably lie with the Celto- Ligurian people who settled around the natural harbour of Aegytna. The remains of a defensive wall are still visible on Mont Auriasque and Cap Capelin. The Phocaeans of Marseille later established an outpost on the site. Foundation Frejus was strategically situated at an important crossroads formed by the Via Julia Augusta (which ran between Italy and the Rhône) and the Via Domitia. Although there are only few traces of a settlement at that time, it is known that the poet Cornelius Gallus was born there ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saint-Raphaël, Var
Saint-Raphaël (; oc, Sant Rafèu ) is a commune in the Var department, Provence-Alpes-Côte d'Azur region, Southeastern France. In 2017, it had a population of 35,042. Immediately to the west of Saint-Raphaël lies a larger and older town, Fréjus; together they form an urban agglomeration known as Var Estérel Méditerranée, which also encompasses the smaller communes of Les Adrets-de-l'Estérel, Puget-sur-Argens and Roquebrune-sur-Argens. In the second half of the 19th century, the township came under the influence of Mayor Felix Martin and writer Jean-Baptiste Alphonse Karr; owing to their efforts and its beneficial climate the commune developed into a seaside resort popular with artists, sportsmen and politicians. It is the seat of the canton of Saint-Raphaël, also encompassing Fréjus and Les Adrets-de-l'Estérel, which is the economic and cultural centre of Eastern Var, within the arrondissement of Draguignan. Its inhabitants are called ''Raphaëlois'' in French ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Argens
The Argens (; oc, Argens) is a 116 km long river of the French Riviera. Its drainage basin is fully included in the Var department.Bassin versant : Argens (L') Observatoire Régional Eau et Milieux Aquatiques en PACA The river goes through , , Roquebrune-sur-Argens, Fréjus, then it flows into the |
Pegmatite
A pegmatite is an igneous rock showing a very coarse texture, with large interlocking crystals usually greater in size than and sometimes greater than . Most pegmatites are composed of quartz, feldspar, and mica, having a similar silicic composition to granite. However, rarer intermediate composition and mafic pegmatites are known. Many of the world's largest crystals are found within pegmatites. These include crystals of microcline, quartz, mica, spodumene, beryl, and tourmaline. Some individual crystals are over long. Most pegmatites are thought to form from the last fluid fraction of a large crystallizing magma body. This residual fluid is highly enriched in volatiles and trace elements, and its very low viscosity allows molecules to migrate rapidly to join an existing crystal rather than coming together to form new crystals. This allows a few very large crystals to form. While most pegmatites have a simple composition of minerals common in ordinary igneous roc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rivers Of France
This is a list of rivers that are at least partially in France. The rivers are grouped by sea or ocean. The rivers flowing into the sea are sorted along the coast. Rivers flowing into other rivers are listed by the rivers they flow into. Some rivers (e.g. Sûre/Sauer) do not flow through France themselves, but they are mentioned for having French tributaries. They are given in ''italics''. For clarity, only rivers that are longer than 50 km (or have longer tributaries) are shown. In French, rivers are traditionally classified either as ''fleuves'' when they flow into the sea (or into a desert or lake), or as ''rivières'' when they flow into another river. The ''fleuves'' are shown in bold. For an alphabetical overview of rivers of France, see the category Rivers of France. Tributary list North Sea The rivers in this section are sorted north-east (Netherlands) to south-west (Calais). * Rhine/Rhin (main branch at Hook of Holland, Netherlands) ** Moselle (in Koblenz, Germ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Garonne (Var)
The Garonne (, also , ; Occitan, Catalan, Basque, and es, Garona, ; la, Garumna or ) is a river of southwest France and northern Spain. It flows from the central Spanish Pyrenees to the Gironde estuary at the French port of Bordeaux – a length of , of which is in Spain (Val d'Aran); The Ratera-Saboredo cirque has been pointed by many researchers as the origin of the Garonne.Faura i Sans (M.); Sobre hidrología subterránea en los Pirineos Centrales de Aragón y Cataluña. Bol. de la Real Soc. de Hist. Nat, vom. XVI, pgs. 353-354. Madrid, 1916. The third thesis holds that the river rises on the slopes of Pic Aneto at above sea level and flows by way of a sinkhole known as the '' Forau de Aigualluts'' () through the limestone of the Tuca Blanca de Pomèro and a resurgence in the Val dera Artiga above the Aran Valley in the Spanish Pyrenees. This underground route was suggested by the geologist Ramond de Carbonnières in 1787, but there was no confirmation until 1931, w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanic Rocks
Volcanic rock (often shortened to volcanics in scientific contexts) is a rock formed from lava erupted from a volcano. In other words, it differs from other igneous rock by being of volcanic origin. Like all rock types, the concept of volcanic rock is artificial, and in nature volcanic rocks grade into hypabyssal and metamorphic rocks and constitute an important element of some sediments and sedimentary rocks. For these reasons, in geology, volcanics and shallow hypabyssal rocks are not always treated as distinct. In the context of Precambrian shield geology, the term "volcanic" is often applied to what are strictly metavolcanic rocks. Volcanic rocks and sediment that form from magma erupted into the air are called "volcaniclastics," and these are technically sedimentary rocks. Volcanic rocks are among the most common rock types on Earth's surface, particularly in the oceans. On land, they are very common at plate boundaries and in flood basalt provinces. It has been estimate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sandstone
Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar (both silicates) because they are the most resistant minerals to weathering processes at the Earth's surface. Like uncemented sand, sandstone may be any color due to impurities within the minerals, but the most common colors are tan, brown, yellow, red, grey, pink, white, and black. Since sandstone beds often form highly visible cliffs and other topographic features, certain colors of sandstone have been strongly identified with certain regions. Rock formations that are primarily composed of sandstone usually allow the percolation of water and other fluids and are porous enough to store large quantities, making them valuable aquifers and petroleum reservoirs. Quartz-bearing sandstone can be changed into quartzite through metamorphism, usually relate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gneiss
Gneiss ( ) is a common and widely distributed type of metamorphic rock. It is formed by high-temperature and high-pressure metamorphic processes acting on formations composed of igneous or sedimentary rocks. Gneiss forms at higher temperatures and pressures than schist. Gneiss nearly always shows a banded texture characterized by alternating darker and lighter colored bands and without a distinct cleavage. Gneisses are common in the ancient crust of continental shields. Some of the oldest rocks on Earth are gneisses, such as the Acasta Gneiss. Description Orthogneiss from the Czech Republic In traditional English and North American usage, a gneiss is a coarse-grained metamorphic rock showing compositional banding ( gneissic banding) but poorly developed schistosity and indistinct cleavage. In other words, it is a metamorphic rock composed of mineral grains easily seen with the unaided eye, which form obvious compositional layers, but which has only a weak tendency to fract ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saunders_Quarry-1.jpg "Click for more on -> Sandstone")
