| dbo:abstract |
Das Wort Rausche bezeichnet in der Hydrologie der Gewässer einen flach abfallenden Gewässerabschnitt mit höherer Fließgeschwindigkeit und Wasserturbulenz als im umgebenden Gewässerverlauf. Im Gegensatz zum Kolk haben Rauschen bei wechselnden Wasserführungen relativ gleichbleibend hohe Turbulenz bei ansteigendem Abfluss. In einem natürlichen Gewässer wechseln sich Rauschen und Kolke regelhaft ab. In der Renaturierung werden in vielen Fällen künstliche Feldsteinrauschen eingesetzt, um stufenförmige Sohlabstürze (zum Beispiel Wehre) abzubauen, die die Fischwanderung behindern, und um Strukturierung und Besiedlung des Gewässergrundes zu verbessern. Sandfreie, kiesige Rauschen sind wichtige Laichplätze zum Beispiel für Bachforellen, da hier eine ausreichende Sauerstoffversorgung des Laichs gewährleistet ist. Rauschen werden daher gelegentlich auch als Laichbänke bezeichnet. (de) In a flowing stream, a riffle-pool sequence (also known as a pool-riffle sequence) develops as a stream's hydrological flow structure alternates from areas of relatively shallow to deeper water. This sequence is present only in streams carrying gravel or coarser sediments. Riffles are formed in shallow areas by coarser materials, such as gravel deposits, over which water flows. Pools are deeper, calmer areas whose bed load (in general) is made up of finer material such as silt. Streams with only sand or silt laden beds do not develop the feature. The sequence within a stream bed commonly occurs at intervals of from 5 to 7 stream widths. Meandering streams with relatively coarse bed load tend to develop a riffle-pool sequence with pools in the outsides of the bends and riffles in the crossovers between one meander to the next on the opposite margin of the stream. The pools are areas of active erosion and the material eroded tends to be deposited in the riffle areas between them. (en) |
| dbo:thumbnail |
wiki-commons:Special:FilePath/Giba_river_at_Inda_Mihtsun.jpg?width=300 |
| dbo:wikiPageExternalLink |
http://environment.fhwa.dot.gov/ecosystems/wildlife/fish2.asp https://web.archive.org/web/20060207000156/http:/www.boquetriver.org/adoptriffle.html https://web.archive.org/web/20060716103822/http:/www.uwsp.edu/geo/faculty/ritter/geog101/textbook/fluvial_systems/channel_types.html |
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dbc:Limnology dbr:Bed_load dbc:Rivers dbr:Stream_pool dbr:Stream dbc:Physical_geography dbr:Gravel dbr:Riffle dbc:Water_streams dbc:Geomorphology dbr:Meander dbr:Sand dbr:Silt dbr:Sediment dbr:File:Giba_river_at_Inda_Mihtsun.jpg dbr:File:Pool_in_Giba.jpg |
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dbt:Citations_needed dbt:Reflist dbt:Rivers,_streams_and_springs |
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dbc:Limnology dbc:Rivers dbc:Physical_geography dbc:Water_streams dbc:Geomorphology |
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yago:WikicatWaterStreams yago:BodyOfWater109225146 yago:PhysicalEntity100001930 yago:YagoGeoEntity yago:YagoPermanentlyLocatedEntity yago:River109411430 yago:Stream109448361 yago:Thing100002452 yago:WikicatRivers |
| rdfs:comment |
Das Wort Rausche bezeichnet in der Hydrologie der Gewässer einen flach abfallenden Gewässerabschnitt mit höherer Fließgeschwindigkeit und Wasserturbulenz als im umgebenden Gewässerverlauf. Im Gegensatz zum Kolk haben Rauschen bei wechselnden Wasserführungen relativ gleichbleibend hohe Turbulenz bei ansteigendem Abfluss. In einem natürlichen Gewässer wechseln sich Rauschen und Kolke regelhaft ab. (de) In a flowing stream, a riffle-pool sequence (also known as a pool-riffle sequence) develops as a stream's hydrological flow structure alternates from areas of relatively shallow to deeper water. This sequence is present only in streams carrying gravel or coarser sediments. Riffles are formed in shallow areas by coarser materials, such as gravel deposits, over which water flows. Pools are deeper, calmer areas whose bed load (in general) is made up of finer material such as silt. Streams with only sand or silt laden beds do not develop the feature. The sequence within a stream bed commonly occurs at intervals of from 5 to 7 stream widths. Meandering streams with relatively coarse bed load tend to develop a riffle-pool sequence with pools in the outsides of the bends and riffles in the crosso (en) |
| rdfs:label |
Rausche (Hydrogeologie) (de) Riffle-pool sequence (en) |
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freebase:Riffle-pool sequence yago-res:Riffle-pool sequence wikidata:Riffle-pool sequence dbpedia-de:Riffle-pool sequence https://global.dbpedia.org/id/jm7j |
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wikipedia-en:Riffle-pool_sequence?oldid=1045197556&ns=0 |
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wiki-commons:Special:FilePath/Giba_river_at_Inda_Mihtsun.jpg wiki-commons:Special:FilePath/Pool_in_Giba.jpg |
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wikipedia-en:Riffle-pool_sequence |
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dbr:Little_Avon_River dbr:River_Perry dbr:River_Tillingbourne dbr:North_Shore_Channel dbr:Coon_Creek_(Kishwaukee_River_tributary) dbr:Missouri_River dbr:Cambarus_acuminatus dbr:Course_of_San_Juan_Creek dbr:Riffle-Pool_Sequence dbr:Middle_Fork_American_River dbr:Channel_types dbr:Meander dbr:Pool-and-riffle dbr:Pool-riffle_sequences |
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wikipedia-en:Riffle-pool_sequence |
