000151688 001__ 151688
000151688 005__ 20190316234854.0
000151688 020__ $$a978-3-939230-00-7
000151688 037__ $$aCONF
000151688 245__ $$aInfluence of macro-rough banks on steady flow in a channel
000151688 269__ $$a2010
000151688 260__ $$bEd. Dittrich, Koll, Aeberle & Geisenhainer (eds)$$c2010$$aBraunschweig, Germany
000151688 336__ $$aConference Papers
000151688 500__ $$a[739]
000151688 520__ $$aHigh-head storage hydropower plants operate their turbines during periods of high energy demand. The starting and stopping of turbines results in rapid fluctuations of discharge and water levels in rivers called hydropeaking, which are unfavorable from an ecological point of view. Morphological measures might help to reduce the fluctuations by increasing the natural retention capacity of rivers. With this practical background, the experimental investigations presented in this paper focused on the determination of the flow resistance under steady flow conditions caused by large scale roughness elements at the channel banks, namely rectangular cavities (depressions). The experiments conducted in 41 different geometrical configurations showed various two dimensional flow characteristics in the cavities. 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 due to the disturbance of the bank geometry. Three different approaches have been considered relating the additional flow resistance due to macro-roughness to the forms of the banks. By separating the observed flow conditions into a square grooved, a reattachment and a normal recirculating flow type, the developed macro-rough flow resistance formulas are in good agreement with the laboratory experiments. Furthermore, water body oscillations have been observed in axi-symmetric macro-rough configurations. They lead to water-surface oscillations and transverse velocity components
000151688 6531_ $$aMacro-roughness, Flow resistance, Cavity flow, Steady channel flow
000151688 700__ $$0244038$$g110836$$aMeile, Tobias
000151688 700__ $$0240225$$g104572$$aBoillat, Jean-Louis
000151688 700__ $$aSchleiss, Anton$$g112841$$0241228
000151688 7112_ $$dSeptember 8-10, 2010$$cBraunschweig, Germany$$aRiver Flow 2010
000151688 773__ $$tRiver Flow 2010$$q343-351
000151688 8564_ $$uhttp://www.riverflow2010.org/$$zURL
000151688 8564_ $$uhttps://infoscience.epfl.ch/record/151688/files/2010-739-Meile_Boillat_Schleiss_Influence_of_macro_rough_banks_on_steady_flow_in_a_channel_River_Flow_2010.pdf$$zn/a$$s1254939$$yn/a
000151688 909C0 $$xU10263$$0252079$$pLCH
000151688 909C0 $$pPL-LCH$$xU10263$$0255473
000151688 909CO $$qGLOBAL_SET$$pconf$$pENAC$$ooai:infoscience.tind.io:151688
000151688 917Z8 $$x206365
000151688 937__ $$aEPFL-CONF-151688
000151688 973__ $$rNON-REVIEWED$$sPUBLISHED$$aEPFL
000151688 980__ $$aCONF