?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=The+Validation+of+the+Logarithmic+Velocity+Profiles+Above+Rough-Bed+Flows&rft.creator=Nassrullah%2C+S&rft.creator=Stubbs%2C+A&rft.creator=Stoesser%2C+T&rft.creator=Wilson%2C+CAME&rft.description=Knowledge+of+rough-bed+flows+is+important+for+river+engineers+and+environmental+scientists+alike+asmost+natural+surface+water+flows+are+considered+within+the+hydraulically+rough+flow+regime.+This+study+helps+our+understanding+of+flow+characteristics+above+a+rough+gravel+riverbed%2C+which+in-turn%2C+affect+fine+sediment+and+nutrient+transport+which+can+have+a+large+impact+on+aquatic+organisms+and+the+ecosystem+at+large.+High+velocity+flows+over+rough+beds+result+in+increased+turbulence+intensity+and+contribute+to+the+suspension+of+fine+sediment.+Therefore%2C+the+main+aim+of+this+study+is+to+validate+first-order+turbulence+statistics+in+the+form+of+spatially-averaged+streamwise+velocity+profiles+of+the+flow+over+a+highly-porous+rough+bed+at+intermediate+relative+submergence.+The+experiments+were+conducted+under+uniform+flow+conditions+in+Cardiff+University%E2%80%99s+Hydraulics+Laboratory+using+a+narrow+flume%2C+10+m+long%2C+0.3+m+wide%2C+and+0.3+m+deep%2C+equipped+with+a+bed+of+natural+gravel+with+an+average+diameter+of+20+mm.+A+side+looking+Acoustic+Doppler+Velocimeter+(ADV)+was+used+to+measure+velocity+profiles+at+40+random+locations+within+the+sampling+area.+The+results+show+that+a+logarithmic+velocity+profile+is+valid+for+rough-bed+flows+with+a+von+Karman%E2%80%99s+constant+of+0.41+and+a+Nikuradse+equivalent+sand+roughness+of+between+1.5d+and+2d.&rft.subject=Rough+gravel+riverbed%2C+Acoustic+Doppler+Velocimeter+(ADV)%2C+Rough+surface+turbulence%2C+Logarithmic+velocity%0D%0Aprofile%2C+Hydraulically+rough+flow.&rft.publisher=The+International+Association+for+Hydro-Environment+Engineering+and+Research+(IAHR)&rft.date=2019-09-01&rft.type=Proceedings+paper&rft.publisher=38th+IAHR+World+Congress&rft.language=eng&rft.source=+++++In%3A++Proceedings+of+the+38th+IAHR+World+Congress+(Panama).++++The+International+Association+for+Hydro-Environment+Engineering+and+Research+(IAHR)%3A+Panama+City%2C+Panama.+(2019)+++++&rft.format=text&rft.identifier=https%3A%2F%2Fdiscovery.ucl.ac.uk%2Fid%2Feprint%2F10116515%2F1%2FTHEVALIDATIONOFTHELOGARITHMICVELOCITYPROFILESABOVEROUGH-BEDFLOWS.pdf&rft.identifier=https%3A%2F%2Fdiscovery.ucl.ac.uk%2Fid%2Feprint%2F10116515%2F&rft.rights=open