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• Hjulström_curve abstract "The Hjulström curve, named after Filip Hjulström (1902–1982), is a graph used by hydrologists and geologists to determine whether a river will erode, transport, or deposit sediment. It was originally published in his doctoral thesis \"The River Fyris\" in 1935. The graph takes sediment particle size and water velocity into account.The upper curve shows the critical erosion velocity in cm/s as a function of particle size in mm, while the lower curve shows the deposition velocity as a function of particle size. Note that the axes are logarithmic. The plot shows several key concepts about the relationships between erosion, transportation, and deposition. For particle sizes where friction is the dominating force preventing erosion, the curves follow each other closely and the required velocity increases with particle size. However, for cohesive sediment, mostly clay but also silt, the erosion velocity increases with decreasing grainsize, as the cohesive forces are relatively more important when the particles get smaller. The critical velocity for deposition, on the other hand, depends on the settling velocity, and that decreases with decreasing grainsize. The Hjulström curve shows that sand particles of a size around 0.1 mm require the lowest stream velocity to erode.The curve was in 1956 expanded by Hjulström's disciple and successor as professor, Åke Sundborg. He significantly improved the level of detail in the cohesive part of the diagram, and added lines for different modes of transportation. The result is called the Sundborg diagram, or the Hjulström-Sundborg Diagram, in the academic literature.This curve dates back to early 20th century research on river geomorphology and has no more than a historical value nowadays, although its simplicity is still attractive. Among the drawbacks of this curve are that it does not take the water depth into account and more importantly, that it does not show that sedimentation is caused by flow velocity deceleration and erosion is caused by flow acceleration. The dimensionless Shields diagram is now unanimously accepted for initiation of sediment motion in rivers. Much work was done on river sediment transport formulae in the second half of the 20th century and that work should be used preferably to Hjulström's curve, e.g. Meyer-Peter & Müller (1948), Engelund-Hansen (1967), Lefort (1991), Belleudy (2012). Please refer to the much more detailed page on sediment transport.".
• Hjulström_curve thumbnail Hjulströms_diagram_en.PNG?width=300.
• Hjulström_curve wikiPageID "5949047".
• Hjulström_curve wikiPageLength "3248".
• Hjulström_curve wikiPageOutDegree "21".
• Hjulström_curve wikiPageRevisionID "699936234".
• Hjulström_curve wikiPageWikiLink Category:Curves.
• Hjulström_curve wikiPageWikiLink Category:Geography.
• Hjulström_curve wikiPageWikiLink Category:Geological_techniques.
• Hjulström_curve wikiPageWikiLink Category:Geomorphology.
• Hjulström_curve wikiPageWikiLink Category:Hydrology.
• Hjulström_curve wikiPageWikiLink Clay.
• Hjulström_curve wikiPageWikiLink Cohesion_(geology).
• Hjulström_curve wikiPageWikiLink Deposition_(geology).
• Hjulström_curve wikiPageWikiLink Erosion.
• Hjulström_curve wikiPageWikiLink Filip_Hjulström.
• Hjulström_curve wikiPageWikiLink Grainsize.
• Hjulström_curve wikiPageWikiLink Graph_of_a_function.
• Hjulström_curve wikiPageWikiLink Hydrology.
• Hjulström_curve wikiPageWikiLink Logarithmic_scale.
• Hjulström_curve wikiPageWikiLink River.
• Hjulström_curve wikiPageWikiLink Sediment_transport.
• Hjulström_curve wikiPageWikiLink Silt.
• Hjulström_curve wikiPageWikiLink Terminal_velocity.
• Hjulström_curve wikiPageWikiLink Åke_Sundborg.
• Hjulström_curve wikiPageWikiLink File:Hjulströms_diagram_en.PNG.
• Hjulström_curve wikiPageWikiLinkText "Hjulstroms Diagram".
• Hjulström_curve wikiPageWikiLinkText "Hjulström curve".
• Hjulström_curve wikiPageUsesTemplate Template:Reflist.
• Hjulström_curve subject Category:Curves.
• Hjulström_curve subject Category:Geography.
• Hjulström_curve subject Category:Geological_techniques.
• Hjulström_curve subject Category:Geomorphology.
• Hjulström_curve subject Category:Hydrology.
• Hjulström_curve hypernym Graph.
• Hjulström_curve type Software.
• Hjulström_curve type Classification.
• Hjulström_curve type Diacritic.
• Hjulström_curve type Geophysic.
• Hjulström_curve type Redirect.
• Hjulström_curve type Science.
• Hjulström_curve type Subfield.
• Hjulström_curve comment "The Hjulström curve, named after Filip Hjulström (1902–1982), is a graph used by hydrologists and geologists to determine whether a river will erode, transport, or deposit sediment. It was originally published in his doctoral thesis \"The River Fyris\" in 1935.".
• Hjulström_curve label "Hjulström curve".
• Hjulström_curve sameAs Q1621367.
• Hjulström_curve sameAs منحنى_هجلستروم.
• Hjulström_curve sameAs Hjulström-Diagramm.
• Hjulström_curve sameAs Curva_de_Hjulström.
• Hjulström_curve sameAs Hjulström_kurba.
• Hjulström_curve sameAs Diagramme_de_Hjulström.
• Hjulström_curve sameAs Curva_di_Hjulström.
• Hjulström_curve sameAs m.0fg4ql.
• Hjulström_curve sameAs Hjulströms_diagram.
• Hjulström_curve sameAs Q1621367.
• Hjulström_curve wasDerivedFrom Hjulström_curve?oldid=699936234.
• Hjulström_curve depiction Hjulströms_diagram_en.PNG.
• Hjulström_curve isPrimaryTopicOf Hjulström_curve.