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http://dbpedia.org/ontology/abstract Un embâcle naturel est une accumulation naUn embâcle naturel est une accumulation naturelle de matériaux apportés par l'eau (exceptionnellement par un glissement de terrain) ; il peut s'agir d'accumulation de matériaux rocheux issus de l'érosion, de branches mortes, de plantes aquatiques, de feuilles mortes, de sédiments, de bois flottés ou d'embâcle de glace (au moment de la débâcle). La formation des embâcles puis leur éventuelle rupture jouent un rôle majeur dans la vie d'un cours d'eau, notamment dans les zones de plaine alluviale (et/ou de confluence, particulièrement pour les embâcles constitués de glace). Ces embâcles contribuent à la formation de zones de sédimentation, de bancs de galets, de sable ou gravier, et en réaction de nouvelles zones d'affouillement avec parfois production de méandres, de tresses, d'îlots favorables à la biodiversité et au ralentissement du flux sédimentaire. Souvent, l'accumulation de bois se forme à partir d'une courbe, d'un point d'appui (roches), d'un arbre tombé en travers d'une rivière ou d'un ancien barrage de castors (etc.). L'obstruction de l'écoulement entraîne le contournement de l'embâcle par la rivière, créant et renouvelant les milieux et favorisant notamment les espèces pionnières dans le nouveau lit d'écoulement primaire mais aussi secondaire. Les embâcles naturels sont souvent emportés par les crues après quelques mois ou années, mais ils peuvent alors souvent contribuer à reconstituer d'autres embâcles plus en aval. Parfois, il se stabilisent pour former des structures géomorphologiques relativement pérennes, complexifiant alors le lit (méandrage). Pour les embâcles uniquement constitués de glace, voir aussi l'article « embâcle de glace ».voir aussi l'article « embâcle de glace ». , Unter Verklausung wird der teilweise oder Unter Verklausung wird der teilweise oder vollständige Verschluss eines Fließgewässerquerschnittes infolge angeschwemmten Treibgutes oder Totholzes verstanden. Dadurch wird das Wasser aufgestaut, was zu schnell und stark steigenden Wasserständen oberhalb des Abflusshindernisses führt. Das Wasser versucht nun, das Abflusshindernis zu über- oder umströmen. Die Folgen können oder Überschwemmungen sein. Verklausungen bilden sich vorwiegend an Gewässerengstellen, wie Querbauwerken, verrohrten Bachstrecken, Durchlässen oder zwischen Brückenpfeilern. Besonders gefürchtet sind Verklausungen in Hochwasserentlastungsanlagen von Talsperren oder in deren Grundablässen. Der Wortstamm verweist auf die Klause, einen besonders engen und steilen Abschnitt in einem Flusstal.n und steilen Abschnitt in einem Flusstal. , A log jam is a naturally occurring phenomeA log jam is a naturally occurring phenomenon characterized by a dense accumulation of tree trunks and pieces of large wood across a vast section of a river, stream, or lake. ("Large wood" is commonly defined as pieces of wood more than 10 cm (4 in) in diameter and more than 1 m (3 ft 3 in) long) Log jams in rivers and streams often span the entirety of the water's surface from bank to bank. Log jams form when trees floating in the water become entangled with other trees floating in the water, or become snagged on rocks, large woody debris, or other objects anchored underwater. They can build up slowly over months or years, or they can happen instantaneously when large numbers of trees are swept into the water after natural disasters. A notable example caused by a natural disaster is the log jam that occurred in Spirit Lake following a landslide triggered by the eruption of Mount St. Helens. Until they are dismantled by natural causes or humans, log jams can grow exponentially as more wood arriving from upstream becomes entangled in the mass. Log jams can persist for many decades, as is the case with the log jam in Spirit Lake. Historically in North America, large natural "log rafts" were common across the continent prior to European settlement. The most famous natural wood raft is the Great Raft on the Red River in Louisiana, which prior to its removal in the 1830s affected between 390 and 480 km (240–300 mi) of the main channel. It has been suggested that such extensive log rafts may have been common in Europe in prehistory. Log jams are not to be confused with man-made timber rafts created by loggers or the intentional release of large masses of trees into the water during a log drive to a sawmill.the water during a log drive to a sawmill.
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rdfs:comment Un embâcle naturel est une accumulation naUn embâcle naturel est une accumulation naturelle de matériaux apportés par l'eau (exceptionnellement par un glissement de terrain) ; il peut s'agir d'accumulation de matériaux rocheux issus de l'érosion, de branches mortes, de plantes aquatiques, de feuilles mortes, de sédiments, de bois flottés ou d'embâcle de glace (au moment de la débâcle). Les embâcles naturels sont souvent emportés par les crues après quelques mois ou années, mais ils peuvent alors souvent contribuer à reconstituer d'autres embâcles plus en aval.constituer d'autres embâcles plus en aval. , Unter Verklausung wird der teilweise oder Unter Verklausung wird der teilweise oder vollständige Verschluss eines Fließgewässerquerschnittes infolge angeschwemmten Treibgutes oder Totholzes verstanden. Dadurch wird das Wasser aufgestaut, was zu schnell und stark steigenden Wasserständen oberhalb des Abflusshindernisses führt. Das Wasser versucht nun, das Abflusshindernis zu über- oder umströmen. Die Folgen können oder Überschwemmungen sein. Verklausungen bilden sich vorwiegend an Gewässerengstellen, wie Querbauwerken, verrohrten Bachstrecken, Durchlässen oder zwischen Brückenpfeilern. Besonders gefürchtet sind Verklausungen in Hochwasserentlastungsanlagen von Talsperren oder in deren Grundablässen.on Talsperren oder in deren Grundablässen. , A log jam is a naturally occurring phenomeA log jam is a naturally occurring phenomenon characterized by a dense accumulation of tree trunks and pieces of large wood across a vast section of a river, stream, or lake. ("Large wood" is commonly defined as pieces of wood more than 10 cm (4 in) in diameter and more than 1 m (3 ft 3 in) long) Log jams in rivers and streams often span the entirety of the water's surface from bank to bank. Log jams form when trees floating in the water become entangled with other trees floating in the water, or become snagged on rocks, large woody debris, or other objects anchored underwater. They can build up slowly over months or years, or they can happen instantaneously when large numbers of trees are swept into the water after natural disasters. A notable example caused by a natural disaster is the lmple caused by a natural disaster is the l
rdfs:label Embâcle naturel , Verklausung , Log jam
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