QUASI-MEANDERING INDUCED BY FLUVIAL SAND BARS

Fluorescent Sand as a Tracer of Fluvial Sediment

.-_---___-------------------_Introduction. ___________________________ Acknowledgments__ ____________________ Methods used in this study_____________ Coating of grains with fluorescent paint. Sampling of stream sand____________ Sample processing.__________________ The experiment_______________________ Results_-_-______---__-____--_-----___ Page El 1 2 2 2 2 2 3 3 Results Continued Relation of g...

Reverse Meanders, Pseudo Point Bars, and the Enigma of Meandering in Braided Rivers

Current effects on resonant reflection of surface water waves by sand bars

The effect of currents flowing across a bar field on resonant reflection of surface waves by the bars is investigated. Using a multiple-scale expansion, evolution equations for the amplitudes of linear waves are derived and used to investigate the reflection of periodic wave trains with steady amplitude for both normal and oblique incidence. The presence of a current is found to shift resonant ...

Modification of river meandering by tropical deforestation

Tropical forests are the only forest biome to have experienced increased rates of forest loss during the past decade because of global demands for food and biofuels. The implications of such extensive forest clearing on the dynamics of tropical river systems remain relatively unknown, despite significant progress in our understanding of the role of trees in riverbank stability. Here, we documen...

Spiral Meandering

The complex, so called meandering, dynamics of spiral waves in excitable media is examined from the point of view of bifurcation theory. A computational bifurcation analysis is made of spiral dynamics. It is shown that spiral meandering is organized in parameter space around a codimension-two point where a Hopf bifurcation from rotating waves interacts with symmetries on the plane. A simple mod...