Persistent Link:
http://hdl.handle.net/10150/191594
Title:
Measurement of cobble abrasion in natural streams.
Author:
Carlson, Frederick Roberts,1944-
Issue Date:
1974
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
The particle size of sediment in natural streams is modified by sorting, mixing, solution, and abrasion. Abrasion is the physical process(es) occurring during stream-flow events that causes wear (weight loss) of sedimentary particles. The deterministic cobble abrasion model assumes wear is proportional to total frictional work done on the particle (Etot ). Etot equals the work done by bed friction (Eb) plus the work done by dynamic bed-load friction caused by the motion of nearby particles. Eb is estimated by Eb = (3 x 10⁻⁴)Ww x •⁴⁵y•⁵⁵ where Eb = work done by bed friction (ergs) Ww = particle weight in water (grams) y = fall (cm) x = distance moved (cm) Dynamic bed-load friction is not calculable but is assumed to vary directly with size and concentration of moving bed load. Wear is related to total work by abradibility, a factor inversely proportional to sphericity, roundness, and inherent rock strength. Traceable cobbles were abraded in ephemeral streams in southern Arizona. The apparent abrasion efficiency (weight loss per erg of work done by bed friction) varied approximately with discharge squared. Field wear measurements compare reasonably well with prior laboratory measurements. Roundness changes, transport over bedrock, and en route weathering affect the apparent abrasion efficiency observed in natural streams.
Type:
Thesis-Reproduction (electronic); text
LCSH Subjects:
Hydrology.; Sediment transport.; Ephemeral streams -- Arizona.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Hydrology and Water Resources; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
Bull, William B.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleMeasurement of cobble abrasion in natural streams.en_US
dc.creatorCarlson, Frederick Roberts,1944-en_US
dc.contributor.authorCarlson, Frederick Roberts,1944-en_US
dc.date.issued1974en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractThe particle size of sediment in natural streams is modified by sorting, mixing, solution, and abrasion. Abrasion is the physical process(es) occurring during stream-flow events that causes wear (weight loss) of sedimentary particles. The deterministic cobble abrasion model assumes wear is proportional to total frictional work done on the particle (Etot ). Etot equals the work done by bed friction (Eb) plus the work done by dynamic bed-load friction caused by the motion of nearby particles. Eb is estimated by Eb = (3 x 10⁻⁴)Ww x •⁴⁵y•⁵⁵ where Eb = work done by bed friction (ergs) Ww = particle weight in water (grams) y = fall (cm) x = distance moved (cm) Dynamic bed-load friction is not calculable but is assumed to vary directly with size and concentration of moving bed load. Wear is related to total work by abradibility, a factor inversely proportional to sphericity, roundness, and inherent rock strength. Traceable cobbles were abraded in ephemeral streams in southern Arizona. The apparent abrasion efficiency (weight loss per erg of work done by bed friction) varied approximately with discharge squared. Field wear measurements compare reasonably well with prior laboratory measurements. Roundness changes, transport over bedrock, and en route weathering affect the apparent abrasion efficiency observed in natural streams.en_US
dc.description.notehydrology collectionen_US
dc.typeThesis-Reproduction (electronic)en_US
dc.typetexten_US
dc.subject.lcshHydrology.en_US
dc.subject.lcshSediment transport.en_US
dc.subject.lcshEphemeral streams -- Arizona.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineHydrology and Water Resourcesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.chairBull, William B.en_US
dc.identifier.oclc213387022en_US
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