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dc.contributor.convenorhttp://tucson.ars.ag.gov/isco/isco15/main.htm
dc.contributor.authorRouhipour, H.
dc.contributor.authorGhadiri, Hossein
dc.contributor.authorRose, Calvin
dc.contributor.authorYu, Bofu
dc.date.accessioned2017-05-03T11:33:51Z
dc.date.available2017-05-03T11:33:51Z
dc.date.issued2008
dc.date.modified2010-07-07T07:41:09Z
dc.identifier.urihttp://hdl.handle.net/10072/24085
dc.description.abstractManning's roughness coefficient for flow over bare soil is needed in order to determine other hydraulic parameters such as flow depth and velocity in overland flow, parameters needed to calculate streampower and shear stress in erosion process studies. A modified equation of Manning's n was developed to estimate flow velocity in shallow overland flow in experiments undertaken in a 5.8 by 1 m flume of the Griffith University Tilting flume Simulated Rainfall facility and adopted data from the literature. Even with the flow of water over a soil surface in which roughness elements are well inundated, and in less erosive situations where erosional bed forms are not pronounced, the magnitude of resistance coefficients in equations such as those of Manning, Darcy-Weisbach or Chezy vary with flow velocity (at least). Using both original laboratory and field data, and data from the literature, the paper examines this question of the apparent variation of resistance coefficients in relation to flow velocity, even in the absence of interaction between hydraulics and resulting erosional bed forms. Resistance equations are first assessed as to their ability to describe overland flow velocity when tested against these data sources. The result is that Manning's equation received stronger support than the Darcy-Weisbach or Chezy equations, though all equations were useful. The second question addressed is how best to estimate velocity of overland flow from measurements of slope and unit discharge, recognizing that the apparent flow velocity variation in resistance coefficients is probably a result of shortcomings in all of the listed resistance equations. A new methodology is illustrated which gives good agreement between estimated and measured flow velocity for both well-inundated sheet and rill flow. Comments are given on the predictive use of this methodology.
dc.description.publicationstatusYes
dc.format.extent405980 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglish
dc.language.isoen_AU
dc.publisherNo data provided
dc.publisher.placeBudapest, Hungary
dc.publisher.urihttp://tucson.ars.ag.gov/isco/isco15/MS.htm
dc.relation.ispartofstudentpublicationN
dc.relation.ispartofconferencename15th International Soil Conservation Conference
dc.relation.ispartofconferencetitleSoil and Water Conservation, Climate Change and Environmental Sensitivity
dc.relation.ispartofdatefrom2008-05-19
dc.relation.ispartofdateto2008-05-23
dc.relation.ispartoflocationBudapest, Hungary
dc.rights.retentionY
dc.subject.fieldofresearchcode300104
dc.titleA new methodology for velocity estimation in sheet and rilled overland flow using modified Manning's roughness coefficient
dc.typeConference output
dc.type.descriptionE2 - Conferences (Non Refereed)
dc.type.codeE - Conference Publications
gro.rights.copyright© The Author(s) 2008. The attached file is posted here with permission of the copyright owners for your personal use only. No further distribution permitted. For information about this conference please refer to the publisher's website or contact the authors.
gro.date.issued2008
gro.hasfulltextFull Text
gro.griffith.authorRose, Calvin W.
gro.griffith.authorGhadiri, Hossein
gro.griffith.authorYu, Bofu


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    Contains papers delivered by Griffith authors at national and international conferences.

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