Bifurcation Mechanics

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Presentation transcript:

Bifurcation Mechanics Conjecture: The network is in dynamic equilibrium because these asymmetric bifurcations are in dynamic equilibrium What processes? flow partitioning by bed topography and channel planform flow partitioning by downstream water surface BCs flow partitioning by secondary circulation bedload partitioning by bed topography suspended load partitioning by tapping surface waters Consider simplest case with lengths and downstream WSE of branches equal, and steady Q and Qs of main stem Perfectly symmetric case seems like a reasonable solution What about asymmetric cases? Maybe, if… topographic steering of bedload: bed ramp partitions bedload according to long and transverse slopes shallower throat taps water with lower suspended solids bed ramp creates dynamic WSE differences at throats, thereby changing energy slopes in branches topographic steering of flow Method: Use morphodynamic model simulating Unsteady/Nonuniform flow and sed transport: Delt3d (SLIDE showing grid with BCs and verbal list of relations)