Izbash formula (original) (raw)
The Izbash formula is a formula for the stability calculation of armourstone in running water. The stability of granular material in flow can be determined by the Shields formula or the Izbash formula. The first is more suitable for fine grain material (such as sand and gravel), while the Izbash formula is more suitable for larger stone. The Izbash formula was developed by . In general form, the formula ... or ... where:
| Property | Value |
|---|---|
| dbo:abstract | The Izbash formula is a formula for the stability calculation of armourstone in running water. The stability of granular material in flow can be determined by the Shields formula or the Izbash formula. The first is more suitable for fine grain material (such as sand and gravel), while the Izbash formula is more suitable for larger stone. The Izbash formula was developed by . In general form, the formula ... or ... where: uc = flow rate in the vicinity of the stoneΔ = relative density of the stone (= (ρs -ρw)/ρw) where ρs is the density of the stone and ρw is the density of the waterg = acceleration of gravityd = diameter of the stone The coefficient 1.7 is the experimental constant measured by Izbash. In fact, this constant contains two components, namely an effect for friction, inertia, etc. and a component that describes the turbulent character of the current. The use of the coefficient 1.7 is therefore only permitted in currents where the turbulence is locally generated by the roughness of the water building block. In other cases, this should be adjusted. (en) De Izbash-formule is een formule voor de stabiliteitsberekening van waterbouwsteen in stromend water. De stabiliteit van korrelig materiaal in stroming kan bepaald worden met de Shields-formule of de Izbash-formule. De eerste is meer geschikt voor fijnkorrelig materiaal (zoals zand en grind), terwijl de Izbash-formule meer geschikt is voor grotere steen. De Izbash-formule is ontwikkeld door Sergej Vladimirovitsj Izbasj.In algemene vorm is de formule ... of ... waarin: uc = stroomsnelheid in de nabijheid van de steenΔ = relatieve dichtheid van de steen (= (ρs − ρw)/ρw) waarin ρs de dichtheid van de steen en ρw de dichtheid van het water isg = versnelling van de zwaartekrachtd = diameter van de steen De coëfficiënt 1,7 is de door Izbash gemeten experimentele constante. Feitelijk bevat deze constante twee componenten, nl. een effect voor de wrijving, traagheid, etc. en een component die het turbulente karakter van de stroom beschrijft. Het gebruik van de coëfficiënt 1,7 is dan ook alleen toegestaan in stroming waar de turbulentie lokaal door de ruwheid van de waterbouwsteen is opgewekt. In andere gevallen moet dit worden aangepast. (nl) |
| dbo:thumbnail | wiki-commons:Special:FilePath/Izbash-derivation.jpg?width=300 |
| dbo:wikiPageExternalLink | http://kennisbank-waterbouw.tudelft.nl/DesignCodes/rockmanual/ |
| dbo:wikiPageID | 68237078 (xsd:integer) |
| dbo:wikiPageLength | 11604 (xsd:nonNegativeInteger) |
| dbo:wikiPageRevisionID | 1073174241 (xsd:integer) |
| dbo:wikiPageWikiLink | dbc:Rivers dbr:Armourstone dbr:Density dbr:Turbulence dbr:Turbulence_modeling dbc:Hydraulic_structures dbr:Shields_formula dbr:Turbulence_modelling dbr:File:Izbash-derivation.jpg dbr:File:Slope_effect_of_a_current.jpg dbr:File:Vortex-Hofland1.jpg dbr:File:Vortex-Hofland2.jpg dbr:Sergei_Vladimirovich_Izbash |
| dbp:wikiPageUsesTemplate | dbt:Cite_book dbt:Reflist dbt:Short_description |
| dcterms:subject | dbc:Rivers dbc:Hydraulic_structures |
| rdfs:comment | The Izbash formula is a formula for the stability calculation of armourstone in running water. The stability of granular material in flow can be determined by the Shields formula or the Izbash formula. The first is more suitable for fine grain material (such as sand and gravel), while the Izbash formula is more suitable for larger stone. The Izbash formula was developed by . In general form, the formula ... or ... where: (en) De Izbash-formule is een formule voor de stabiliteitsberekening van waterbouwsteen in stromend water. De stabiliteit van korrelig materiaal in stroming kan bepaald worden met de Shields-formule of de Izbash-formule. De eerste is meer geschikt voor fijnkorrelig materiaal (zoals zand en grind), terwijl de Izbash-formule meer geschikt is voor grotere steen. De Izbash-formule is ontwikkeld door Sergej Vladimirovitsj Izbasj.In algemene vorm is de formule ... of ... waarin: (nl) |
| rdfs:label | Izbash formula (en) Izbash-formule (nl) |
| owl:sameAs | wikidata:Izbash formula dbpedia-nl:Izbash formula https://global.dbpedia.org/id/9Yksj |
| prov:wasDerivedFrom | wikipedia-en:Izbash_formula?oldid=1073174241&ns=0 |
| foaf:depiction | wiki-commons:Special:FilePath/Izbash-derivation.jpg wiki-commons:Special:FilePath/Slope_effect_of_a_current.jpg wiki-commons:Special:FilePath/Vortex-Hofland1.jpg wiki-commons:Special:FilePath/Vortex-Hofland2.jpg |
| foaf:isPrimaryTopicOf | wikipedia-en:Izbash_formula |
| is dbo:wikiPageWikiLink of | dbr:Armourstone dbr:Shields_formula |
| is foaf:primaryTopic of | wikipedia-en:Izbash_formula |
