000182755 001__ 182755
000182755 005__ 20190316235536.0
000182755 0247_ $$2doi$$a10.1029/2012JF002414
000182755 02470 $$2ISI$$a000310683200001
000182755 037__ $$aARTICLE
000182755 245__ $$aFlow processes near smooth and rough (concave) outer banks in curved open channels
000182755 269__ $$a2012
000182755 260__ $$bAmer Geophysical Union$$c2012$$aWashington
000182755 300__ $$a17
000182755 336__ $$aJournal Articles
000182755 500__ $$a[888]
000182755 520__ $$aFlow processes near the (concave) outer bank in curved river reaches are investigated in a laboratory flume, with focus on the influence of the bank roughness. An outer-bank cell of reversed secondary flow occurs for all the investigated roughness configurations of the outer bank. The cell widens the outer-bank boundary layer, which reduces the flow forcing on the bank, but also advects high-momentum fluid toward the lower part of the bank, which enhances the flow forcing on the bank. Increasing the roughness of the outer bank causes a considerable widening and strengthening of the outer-bank cell, which amplifies both effects on the flow forcing. The widening of the outer-bank boundary layer induced by the outer-bank cell reduces the effective width of the channel, i.e., the width where most of the discharge is conveyed, which increases significantly the sediment transport capacity in the central part of the channel. The near-bank processes are qualitatively similar but show considerable quantitative variations around the bend. The outer-bank cell reaches its maximum strength in the zone that is most vulnerable to bed scour and bank erosion, which corroborates its morphological relevance. The outer cell is mainly generated by reversed near-surface gradients in the profile of the streamwise velocity. The anisotropy of the cross-stream turbulence is the major mechanism opposed to the outer-bank cell. Increasing roughness of the outer bank amplifies all dominant mechanisms but does not modify their relative importance. The relevance of the experimental results for natural curved river configurations is discussed.
000182755 6531_ $$aFlow processes , open channels
000182755 700__ $$0241199$$g112543$$aBlanckaert, Koen
000182755 700__ $$aDuarte, A.
000182755 700__ $$aChen, Q.
000182755 700__ $$0241228$$g112841$$aSchleiss, Anton
000182755 773__ $$j117$$tJournal of Geophysical Research$$q1-17
000182755 8564_ $$uhttps://infoscience.epfl.ch/record/182755/files/2012-888_Blanckaert_Duarte_Chen_Schleiss_Flow_processes_near_smooth_and_rough_outer_banks.pdf$$zn/a$$s3469376$$yn/a
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000182755 937__ $$aEPFL-ARTICLE-182755
000182755 973__ $$rNON-REVIEWED$$sPUBLISHED$$aEPFL
000182755 980__ $$aARTICLE