14 research outputs found
Reasons for and against participation in studies of medicinal therapies for women with breast cancer: a debate
Diffusion of bedload particles in open-channel flows: distribution of travel times and second-order statistics of particle trajectories
Indicators of river system hydromorphological character and dynamics: understanding current conditions and guiding sustainable river management
The work leading to this paper received funding from the EUâs FP7 programme under Grant Agreement No. 282656 (REFORM). The Indicators were developed within the context of REFORM deliverable D2.1, therefore all partners involved in this deliverable contributed to some extent to their discussion and development
Novel massâaggregationâbased calibration of an acoustic method of monitoring bedload flux by infrequent desert flash floods
Bedload transport in rivers, size matters but so does shape
International audienceBedload transport modelling in rivers takes into account the size and density of pebbles to estimate particle mobility, but does not formally consider particle shape. To address this issue and to compare the relative roles of the density and shape of particles, we performed original sediment transport experiments in an annular flume using molded artificial pebbles equipped with a radio frequency identification tracking system. The particles were designed with four distinct shapes and four different densities while having the same volume, and their speeds and distances traveled under constant hydraulic conditions were analyzed. The results show that particle shape has more influence than particle density on the resting time between particle displacement and the mean traveling distance. For all densities investigated, the particle shape systematically induced differences in travel distance that were strongly correlated (R-2 = 0.94) with the Sneed and Folks shape index. Such shape influences, although often mentioned, are here quantified for the first time, demonstrating why and how they can be included in bedload transport models