?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Large-scale+motion+over+spanwise+heterogeneous+bed+roughness&rft.creator=Chung%2C+SW&rft.creator=Luo%2C+Q&rft.creator=Stoesser%2C+T&rft.description=This+paper+presents+results+of+large-eddy+simulations+(LES)+of+open-channel+flow+over+a+bed+with+spanwise+heterogeneous+roughness.+The+smooth+channel+bed+is+roughened+via+streamwise-orientated+triangular+strips.+The+flows+reported+are+at+moderate+Reynolds+and+Froude+numbers+and+at+varying+relative+submergence+(i.e.+water-depth-to-strip-height-ratio).+Due+to+the+presence+of+longitudinal+strips%2C+the+flow+exhibits+significantly+different+mean+flow+characteristics+than+the+analogue+flow+over+a+smooth+channel+bed.+The+strip+roughness+induces+turbulence+anisotropy+which+leads+to+the+formation+of+strong+secondary+currents%2C+featuring+upflow+above+strips+and+downflow+in+the+troughs+between+strips.+It+is+found+that+the+spacing+of+the+strips+and+the+relative+submergence+of+the+flow+has+a+profound+influence+on+the+strength+of+secondary+currents+and+the+large-scale+turbulent+motion.&rft.publisher=CRC+Press&rft.contributor=Ferreira+da+Silva%2C+Ana+Maria&rft.contributor=Rennie%2C+Colin&rft.contributor=Gaskin%2C+Susan&rft.contributor=Lacey%2C+Jay&rft.contributor=MacVicar%2C+Bruce&rft.date=2024-08-14&rft.type=Proceedings+paper&rft.language=eng&rft.source=+++++In%3A+Ferreira+da+Silva%2C+Ana+Maria+and+Rennie%2C+Colin+and+Gaskin%2C+Susan+and+Lacey%2C+Jay+and+MacVicar%2C+Bruce%2C+(eds.)+River+Flow+2022+-+Proceedings+of+the+11th+Conference+on+Fluvial+Hydraulics.++(pp.+pp.+83-89).++CRC+Press%3A+London%2C+UK.+(2024)+++++&rft.identifier=https%3A%2F%2Fdiscovery.ucl.ac.uk%2Fid%2Feprint%2F10199602%2F