000174075 001__ 174075
000174075 005__ 20180913061100.0
000174075 0247_ $$2doi$$a10.1061/(ASCE)HY.1943-7900.0000469
000174075 02470 $$2ISI$$a000299134800004
000174075 037__ $$aARTICLE
000174075 245__ $$aFlow Resistance Caused by Large-Scale Bank Roughness in a Channel
000174075 269__ $$a2011
000174075 260__ $$c2011
000174075 336__ $$aJournal Articles
000174075 500__ $$a[822]
000174075 520__ $$aSystematic experimental investigations have been performed under steady flow conditions in a channel whose banks are equipped with large-scale rectangular roughness elements. The purpose was to determine the flow resistance owing to such macrorough banks. The practical motivation of the study is to see how morphological restoration of banks in channelized rivers, such as lateral cavities, influences the steady flow characteristics. The experiments performed in 40 different geometrical configurations revealed various two-dimensional flow characteristics in the bank cavities created by the roughness elements compared to the prismatic reference channel. The overall head loss of the flow is governed by the existence of different phenomena, such as vertical mixing layers, wake zones, recirculation gyres, coherent structures, and skin friction. The analysis of the experiments for steady flow conditions showed that the flow resistance is significantly increased in the macrorough configurations because of the disturbance of the bank geometry inducing large-scale depressions. The additional flow resistance attributable to macroroughness has been related to the forms of the banks. By separating the observed flow behavior into a normal recirculating, a reattachment and a square-grooved flow type, macrorough flow-resistance formulas according two different approaches could be developed that are in good agreement with the laboratory experiments
000174075 6531_ $$aHydraulic models
000174075 6531_ $$aMacroroughness
000174075 6531_ $$aFlow resistance
000174075 6531_ $$aCavity flow
000174075 6531_ $$aSteady channel flow
000174075 700__ $$0244038$$aMeile, Tobias$$g110836
000174075 700__ $$0240225$$aBoillat, Jean-Louis$$g104572
000174075 700__ $$0241228$$aSchleiss, Anton$$g112841
000174075 773__ $$j137$$k12$$q1588-1597$$tJournal of Hydraulic Engineering
000174075 909C0 $$0252079$$pLCH$$xU10263
000174075 909C0 $$0255473$$pPL-LCH$$xU10263
000174075 909CO $$ooai:infoscience.tind.io:174075$$particle$$pENAC
000174075 917Z8 $$x206365
000174075 917Z8 $$x173008
000174075 937__ $$aEPFL-ARTICLE-174075
000174075 973__ $$aEPFL$$rNON-REVIEWED$$sPUBLISHED
000174075 980__ $$aARTICLE