000202101 001__ 202101
000202101 005__ 20190509132513.0
000202101 0247_ $$2doi$$a10.5075/epfl-lchcomm-58
000202101 022__ $$a1661-1179
000202101 037__ $$aBOOK
000202101 245__ $$aSediment transport and flow conditions in steep rivers with large immobile boulders
000202101 269__ $$a2014
000202101 260__ $$bEPFL - LCH$$c2014$$aLausanne
000202101 336__ $$aBooks
000202101 490__ $$aCommunication (Laboratoire de constructions hydrauliques, Ecole polytechnique fédérale de Lausanne)$$v58
000202101 520__ $$aIn steep mountain rivers, morphological features such as large mostly immobile boulders, strongly influence flow behavior and bedload transport. Without taking into account these large immobile boulders, which are acting as macro-roughness elements, classical bedload transport formula largely overestimate the sediment volume transported. The effect of randomly distributed boulders creating a cascade morphology on the sediment transport capacity and bedload fluctuations in steep mountain channels was studied for the first time by Dr. Tamara Ghilardi with systematic laboratory experiments. A wide grain size distribution was used in the experiments for the movable bedload material present between the large boulders, as it can be found in typical alpine torrents. Boulder size and density was varied in the experiments using shapes of boulders like the ones found in nature. Special attention was also given for the first time on the evolution of the sediment transport characterized by bedload pulses. This allows a new insight on the sediment transport processes in steep channels having large immobile boulders. Finally a new sediment transport formula is suggested which takes into account the presence of such large boulders.
000202101 6531_ $$asteep rivers
000202101 6531_ $$aflume experiments
000202101 6531_ $$aboulders
000202101 6531_ $$amacro-roughness elements
000202101 6531_ $$awide grain size distribution
000202101 6531_ $$abedload fluctuations
000202101 6531_ $$afluctuations amplitude and period
000202101 6531_ $$asediment transport formulae
000202101 700__ $$0242669$$g163150$$aGhilardi, Tamara
000202101 720_1 $$aSchleiss, Anton$$eed.$$g112841$$0241228
000202101 8564_ $$uhttps://infoscience.epfl.ch/record/202101/files/Comm_LCH_58.pdf$$s11079067
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000202101 980__ $$aBOOK