Grain flow (original) (raw)
Ein Körnerstrom (engl. grain flow) ist ein Massentransportprozess wie z. B. eine Sandrutschung auf der Leeseite einer Düne.
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| dbo:abstract | Ein Körnerstrom (engl. grain flow) ist ein Massentransportprozess wie z. B. eine Sandrutschung auf der Leeseite einer Düne. (de) A grain flow is a type of sediment-gravity flow in which the fluid can be either air or water, acts only as a lubricant, and grains within the flow remain in suspension due to grain-to-grain collisions that generate a dispersive pressure to prevent further settling. Grain flows are very common in aeolian settings as grain avalanches on the slip faces of sand dunes. By contrast, pure grain flows are rare in subaqueous settings, where the grains in a flow are generally held in suspension dominantly by traction, saltation, fluid turbulence and/or grain buoyancy when the grains are floating in the clay matrix of a mud flow. However, grain-to-grain collisions are very important as a contributing process of sediment support in subaqueous, sand-rich, high-density turbidity currents. The high concentrations of sand that develop at the base of high-density flows brings grains close enough together that frequent grain-to grain collisions are inevitable and result in layers of sediment that are inverse graded as the smaller grains are able to fall in between larger grains and settle out beneath them. (en) 顆粒流（英語：grain flow）是一種重力流，其中流體（空氣或水），主要是提供潤滑的作用，顆粒在流體中能保持懸浮狀態，是由於顆粒與顆粒之間的碰撞，從而產生分散壓力，而使顆粒不會沉澱。最常見顆粒流是在風成環境中，顆粒因為順沙丘斜面上下滑而形成。相比之下，顆粒流在水下環境中很少。通常顆粒在水中保持懸浮狀態是依賴顆粒的牽引、跳躍、以及流體的湍流作用。在泥流中，顆粒對粘土基質的相對漂浮力，也讓顆粒保持懸浮狀態。在高密度濁流中，底部沙子濃度較高，顆粒間的碰撞能使沙顆粒保持懸浮狀態。較小的顆粒，因爲沒有碰撞反而先沉澱在沙顆粒之下， 造成反向粒级层理。 (zh) |
| dbo:thumbnail | wiki-commons:Special:FilePath/KelsoDunesAvalancheDeposits.jpg?width=300 |
| dbo:wikiPageID | 39934592 (xsd:integer) |
| dbo:wikiPageLength | 1969 (xsd:nonNegativeInteger) |
| dbo:wikiPageRevisionID | 1049928479 (xsd:integer) |
| dbo:wikiPageWikiLink | dbr:Metallurgy dbr:Sand_dunes dbr:Saltation_(geology) dbr:Crystallite dbr:Turbulence dbr:Forging dbc:Sedimentology dbr:Aeolian_processes dbr:Traction_(geology) dbr:Buoyancy dbr:Plastic_deformation dbr:Rolling_(metalworking) dbr:Inverse_grading dbr:High-density_turbidity_currents dbr:Sediment-gravity_flow dbr:Mud_flow dbr:File:KelsoDunesAvalancheDeposits.JPG |
| dbp:wikiPageUsesTemplate | dbt:Geology-stub dbt:Main_article dbt:Reflist |
| dcterms:subject | dbc:Sedimentology |
| gold:hypernym | dbr:Flow |
| rdf:type | dbo:Album |
| rdfs:comment | Ein Körnerstrom (engl. grain flow) ist ein Massentransportprozess wie z. B. eine Sandrutschung auf der Leeseite einer Düne. (de) 顆粒流（英語：grain flow）是一種重力流，其中流體（空氣或水），主要是提供潤滑的作用，顆粒在流體中能保持懸浮狀態，是由於顆粒與顆粒之間的碰撞，從而產生分散壓力，而使顆粒不會沉澱。最常見顆粒流是在風成環境中，顆粒因為順沙丘斜面上下滑而形成。相比之下，顆粒流在水下環境中很少。通常顆粒在水中保持懸浮狀態是依賴顆粒的牽引、跳躍、以及流體的湍流作用。在泥流中，顆粒對粘土基質的相對漂浮力，也讓顆粒保持懸浮狀態。在高密度濁流中，底部沙子濃度較高，顆粒間的碰撞能使沙顆粒保持懸浮狀態。較小的顆粒，因爲沒有碰撞反而先沉澱在沙顆粒之下， 造成反向粒级层理。 (zh) A grain flow is a type of sediment-gravity flow in which the fluid can be either air or water, acts only as a lubricant, and grains within the flow remain in suspension due to grain-to-grain collisions that generate a dispersive pressure to prevent further settling. Grain flows are very common in aeolian settings as grain avalanches on the slip faces of sand dunes. By contrast, pure grain flows are rare in subaqueous settings, where the grains in a flow are generally held in suspension dominantly by traction, saltation, fluid turbulence and/or grain buoyancy when the grains are floating in the clay matrix of a mud flow. However, grain-to-grain collisions are very important as a contributing process of sediment support in subaqueous, sand-rich, high-density turbidity currents. The high conc (en) |
| rdfs:label | Körnerstrom (de) Grain flow (en) 顆粒流 (zh) |
| owl:sameAs | freebase:Grain flow wikidata:Grain flow dbpedia-de:Grain flow dbpedia-zh:Grain flow https://global.dbpedia.org/id/Y17K |
| prov:wasDerivedFrom | wikipedia-en:Grain_flow?oldid=1049928479&ns=0 |
| foaf:depiction | wiki-commons:Special:FilePath/KelsoDunesAvalancheDeposits.jpg |
| foaf:isPrimaryTopicOf | wikipedia-en:Grain_flow |
| is dbo:wikiPageWikiLink of | dbr:1692_Jamaica_earthquake dbr:Cross-bedding dbr:Angoumian dbr:Graded_bedding dbr:Texture_(chemistry) dbr:Sediment_gravity_flow |
| is foaf:primaryTopic of | wikipedia-en:Grain_flow |
