Evaluation of an In Situ Measurement Technique for Streambank Critical Shear Stress and Soil Erodibility

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dc.contributor.authorCharonko, Cami Marieen
dc.contributor.committeecochairMostaghimi, Saieden
dc.contributor.committeecochairThompson, Theresa M.en
dc.contributor.committeememberDiplas, Panayiotisen
dc.contributor.departmentBiological Systems Engineeringen
dc.date.accessioned2014-03-14T20:39:16Zen
dc.date.adate2010-06-23en
dc.date.available2014-03-14T20:39:16Zen
dc.date.issued2010-05-18en
dc.date.rdate2012-06-22en
dc.date.sdate2010-06-03en
dc.description.abstractThe multiangle submerged jet test device (JTD) provides a simple in situ method of measuring streambank critical shear stress (Ï c) and soil erodibility (kd). Previous research showed streambank kd and Ï c can vary by up to four orders of magnitude at a single site; therefore, it is essential to determine if the large range is due to natural variability in soil properties or errors due to the test method. The study objectives were to evaluate the repeatability of the JTD and determine how it compares to traditional flume studies. To evaluate the repeatability, a total of 21 jet tests were conducted on two remolded soils, a clay loam and clay, compacted at uniform moisture content to a bulk density of 1.53 g/cm^3 and 1.46 g/cm^3, respectively. To determine the similarity between JTD and a traditional measurement method, JTD Ï c and kd measurements were compared with measurements determined from flume tests. The JTD kd and Ï c ranged from 1.68-2.81 cm³/N-s and 0.28-0.79 Pa, respectively, for the clay loam and 1.36-2.69 cm³/N-s and 0.30-2.72 Pa, respectively, for the clay. The modest variation of kd and Ï c for the remolded soils suggests the JTD is repeatable, indicating the wide range of parameters measured in the field was a result of natural soil variability. The JTD median kd and Ï c, except clay loam kd (clay loam kd = 2.31 cm^3/N-s, Ï c = 0.45 Pa; clay kd = 2.18 cm^3/N-s, Ï c = 1.10 Pa) were significantly different than the flume values (clay loam kd = 2.43 cm³/N-s, Ï c = 0.23 Pa; clay kd = 4.59 cm³/N-s, Ï c = 0.16 Pa); however, considering the range of potential errors in both test methods, the findings indicate the multiangle submerged jet test provides reasonable measurement of erosion parameters in a field setting.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-06032010-142638en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06032010-142638/en
dc.identifier.urihttp://hdl.handle.net/10919/33401en
dc.publisherVirginia Techen
dc.relation.haspartCharonko_CM_T_2010_f3.AVIen
dc.relation.haspartCharonko_CM_T_2010_f2.AVIen
dc.relation.haspartCharonko_CM_T_2010_f1.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectsubmerged jet test deviceen
dc.subjectflume erosion testen
dc.subjectcohesive soil erosionen
dc.subjectcritical shear stressen
dc.subjectsoil erodibilityen
dc.titleEvaluation of an In Situ Measurement Technique for Streambank Critical Shear Stress and Soil Erodibilityen
dc.typeThesisen
thesis.degree.disciplineBiological Systems Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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