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Ponor
A ponor is a natural opening where surface water enters into underground passages; they may be found in karst landscapes where the geology and the geomorphology is typically dominated by porous limestone rock. Ponors can drain stream or lake water continuously or can at times work as springs, similar to estavelles. Morphologically, ponors come in forms of large pits and caves, large fissures and caverns, networks of smaller cracks, and sedimentary, alluvial drains. Etymology The name for the karst formation ponor comes from Croatian and Slovene. It derives from the proto-Slavic word ''nora'', meaning ''pit'', ''hole'', ''abyss''; the English word ''narrow'' probably has the same origin. Several places in southeast Europe (Bulgaria, Croatia, Czech Republic, Hungary, Romania, Montenegro, Slovenia) bear the name ''Ponor'' due to associated karst openings. Description Whereas a sinkhole (doline) is a depression of surface topography with a pit or cavity directly underneath, a po ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ponor Monte De Fóses
A ponor is a natural opening where surface water enters into underground passages; they may be found in karst landscapes where the geology and the geomorphology is typically dominated by porous limestone rock. Ponors can drain stream or lake water continuously or can at times work as springs, similar to estavelles. Morphologically, ponors come in forms of large pits and caves, large fissures and caverns, networks of smaller cracks, and sedimentary, alluvial drains. Etymology The name for the karst formation ponor comes from Croatian and Slovene. It derives from the proto-Slavic word ''nora'', meaning ''pit'', ''hole'', ''abyss''; the English word ''narrow'' probably has the same origin. Several places in southeast Europe (Bulgaria, Croatia, Czech Republic, Hungary, Romania, Montenegro, Slovenia) bear the name ''Ponor'' due to associated karst openings. Description Whereas a sinkhole (doline) is a depression of surface topography with a pit or cavity directly underneath, a p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polje
A polje, also karst polje or karst field, is a large flat plain found in karstic geological regions of the world, with areas usually . The name derives from the Slavic languages and literally means 'field', whereas in English ''polje'' specifically refers to a karst plain or karst field. In geology A polje, in geological terminology, is a large, flat-floored depression within karst limestone, whose long axis develops in parallel with major structural trends and can become several miles (tens of kilometers) long. Superficial deposits tend to accumulate along the floor. Drainage may be either by surface watercourses (as an ''open polje'') or by swallow holes (as a ''closed polje'') or ponors. Usually, the ponors cannot transmit entire flood flows, so many poljes become wet-season lakes. The structure of some poljes is related to the geological structure, but others are purely the result of lateral dissolution and planation. The development of poljes is fostered by any blockage i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Risle
The Risle (; less common: ''Rille'') is a long river in Normandy, left tributary of the Seine. The river begins in the Orne department west of L'Aigle, crosses the western part of the department of Eure flowing from south to north and out into the estuary of the Seine on the left bank near Berville-sur-Mer. Its upper valley is part of the Pays d'Ouche, its lower valley separates the regions of the Lieuvin and Roumois. The Risle is regarded as a coastal river. Fishing is common downstream at Pont-Audemer. On July 30, 2012, the Risle vanished in a ponor between La Ferrière-sur-Risle and La Houssaye. It runs underground for . Its only major tributary is the Charentonne. The Risle flows through the following departments and communes: *Orne: Sainte-Gauburge-Sainte-Colombe, L'Aigle * Eure: Rugles, Beaumont-le-Roger, Brionne, Montfort-sur-Risle, Pont-Audemer Pont-Audemer () is a commune in the Eure department in the Normandy region in northern France. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Argon Pedion
Argon Pedion ( gr, Ἀργὸν Πεδίον, 3=untilled plain) is the geological name of a "closed karst basin" in the Arcadian highlands in the Peloponnese peninsula of southern Greece. The first known appearance of this name was in a publication by the ancient geographer Pausanias (110–180 AD). He called it untilled plain, because the grassland and acres may be flooded beyond the time when annual vegetation starts. When the winter rains were very heavy, floods can even turn the plain into a temporary lake. Intensive karst formation (drainage in underground waterways of limestone layers) prevents the formation of a permanent lake. In rare cases, even today, modern technologies can not prevent flooding. Geography Environment The prefecture Arcadia (Νομός Αρκαδίας) is almost entirely rural and mountainous (Arcadian Plateau). The villages are scattered all over the land; there are only very few cities, even the largest city Tripoli, Greece, with ca. 30000 in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Estavelle
In karst geology, estavelle or inversac is a ground orifice which, depending on weather conditions and season, can serve either as a sink or as a source of fresh water. It is a type of ponor or sinkhole A sinkhole is a depression or hole in the ground caused by some form of collapse of the surface layer. The term is sometimes used to refer to doline, enclosed depressions that are locally also known as ''vrtače'' and shakeholes, and to openi .... References Karst Cave geology Dinaric karst formations Dinaric Alps {{geology-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Karst Topography
Karst is a topography formed from the dissolution of soluble rocks such as limestone, dolomite, and gypsum. It is characterized by underground drainage systems with sinkholes and caves. It has also been documented for more weathering-resistant rocks, such as quartzite, given the right conditions. Subterranean drainage may limit surface water, with few to no rivers or lakes. However, in regions where the dissolved bedrock is covered (perhaps by debris) or confined by one or more superimposed non-soluble rock strata, distinctive karst features may occur only at subsurface levels and can be totally missing above ground. The study of ''paleokarst'' (buried karst in the stratigraphic column) is important in petroleum geology because as much as 50% of the world's hydrocarbon reserves are hosted in carbonate rock, and much of this is found in porous karst systems. Etymology The English word ''karst'' was borrowed from German in the late 19th century, which entered German much ear ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sinkhole
A sinkhole is a depression or hole in the ground caused by some form of collapse of the surface layer. The term is sometimes used to refer to doline, enclosed depressions that are locally also known as ''vrtače'' and shakeholes, and to openings where surface water enters into underground passages known as ''ponor'', swallow hole or swallet. A '' cenote'' is a type of sinkhole that exposes groundwater underneath. A ''sink'' or ''stream sink'' are more general terms for sites that drain surface water, possibly by infiltration into sediment or crumbled rock. Most sinkholes are caused by karst processes – the chemical dissolution of carbonate rocks, collapse or suffosion processes. Sinkholes are usually circular and vary in size from tens to hundreds of meters both in diameter and depth, and vary in form from soil-lined bowls to bedrock-edged chasms. Sinkholes may form gradually or suddenly, and are found worldwide. Formation Natural processes Sinkholes may capture su ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reka River
The Reka (literally, 'river' in Slovene), also the Inner Carniola Reka ( sl, Notranjska Reka), is a river that starts as Big Creek ( hr, Vela voda) in Croatia, on the southern side of Mount Snežnik, and flows through western Slovenia, where it is also initially known as Big Creek (). The river is long, of which is in Slovenia. At the village of Škocjan it disappears underground through Škocjan Caves (a UNESCO World Heritage Site), flowing underneath the Slovenian Karst. The river continues as part of the Timavo in Italy. Tracer studies have shown that it also feeds springs elsewhere on the Adriatic Coast between Trieste and Monfalcone. It has a pluvial regime. References External links * * Condition of Reka aCerkvenikov Mlinan- graphs, in the following order, of water level and flow data for the past 30 days (taken by ARSO The Slovenian Environment Agency (Slovenian: ''Agencija Republike Slovenije za okolje'' or ''ARSO'') is the main organisation for environment of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spring (hydrology)
A spring is a point of exit at which groundwater from an aquifer flows out on top of Earth's crust ( pedosphere) and becomes surface water. It is a component of the hydrosphere. Springs have long been important for humans as a source of fresh water, especially in arid regions which have relatively little annual rainfall. Springs are driven out onto the surface by various natural forces, such as gravity and hydrostatic pressure. Their yield varies widely from a volumetric flow rate of nearly zero to more than for the biggest springs. Formation Springs are formed when groundwater flows onto the surface. This typically happens when the groundwater table reaches above the surface level. Springs may also be formed as a result of karst topography, aquifers, or volcanic activity. Springs also have been observed on the ocean floor, spewing hot water directly into the ocean. Springs formed as a result of karst topography create karst springs, in which ground water travels throu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Slovenia
Slovenia ( ; sl, Slovenija ), officially the Republic of Slovenia (Slovene: , abbr.: ''RS''), is a country in Central Europe. It is bordered by Italy to the west, Austria to the north, Hungary to the northeast, Croatia to the southeast, and the Adriatic Sea to the southwest. Slovenia is mostly mountainous and forested, covers , and has a population of 2.1 million (2,108,708 people). Slovenes constitute over 80% of the country's population. Slovene, a South Slavic language, is the official language. Slovenia has a predominantly temperate continental climate, with the exception of the Slovene Littoral and the Julian Alps. A sub-mediterranean climate reaches to the northern extensions of the Dinaric Alps that traverse the country in a northwest–southeast direction. The Julian Alps in the northwest have an alpine climate. Toward the northeastern Pannonian Basin, a continental climate is more pronounced. Ljubljana, the capital and largest city of Slovenia, is geogr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eure
Eure () is a department in Normandy in Northwestern France, named after the river Eure. Its prefecture is Évreux. In 2019, Eure had a population of 599,507.Populations légales 2019: 27 Eure INSEE History Eure is one of the original 83 departments created during the on 4 March 1790. It was created from part of the former of . The name in fact is taken from the Eure rive ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
La Houssaye
La Houssaye () is a commune in the Eure department in northern France. Population See also *Communes of the Eure department The following is a list of the 585 communes of the Eure department of France. The communes cooperate in the following intercommunalities (as of 2020):Communes of Eure {{Eure-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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