Separatrix reconnection in the standard nontwist map is described, including exact methods for determining the reconnection threshold in parameter space. These methods are implemented numerically for the case of odd-period orbit reconnection, where meanders (invariant tori that are not graphs) appear. Nested meander structure is numerically demonstrated, and the idea of meander transport is dis...

River biota are affected by global reach-scale pressures, but most approaches for predicting biota of rivers focus on river reach or segment scale processes and habitats. Moreover, these approaches do not consider long-term morphological changes that affect habitat conditions. In this study, a modelling framework was further developed and tested to assess the effect of pressures at different sp...

We prove a determinantal formula for quantities related to the problem of enumeration of (semi-) meanders, namely the topologically inequivalent planar configurations of non-self-intersecting loops crossing a given (half-) line through a given number of points. This is done by the explicit Gram-Schmidt orthogonalization of certain bases of subspaces of the Temperley-Lieb algebra.

Field observations on small rivers of the Amazon basin are less common due to their remote location and difficult accessibility. Here we show, through sensing analysis field works, planform evolution riverbed topography a river located in upper foreland basin, Ichilo River. By tracking changes over 30 years, identified factors that control meander migration rates River: cutoffs, climate human i...

A new workflow has been developed for modelling reservoir successions that comprise fluvial meander-belt deposits, based on algorithms employ multi-point statistics (MPS). library of training images – from which MPS can borrow geological patterns meandering systems built. The incorporate sedimentary architectures relating to point-bar deposits accumulated by meander-bend expansion and translati...

[1] The power law dependencies between channel morphology and river flows, known as at-station hydraulic geometry (HG), have been recently shown to have exponents that systematically vary with scale (contributing area). To explain these empirical trends, a generalized HG model whose parameters are explicit functions of scale was derived by Dodov and Foufoula-Georgiou [2004], based on a statisti...

Understanding of morphodynamic processes associated with large-scale floods has recently improved following significant advances modern technologies. Nevertheless, a clear link between flood discharge and in-channel sedimentation remains to be resolved. The hydrological geomorphological data available for the meandering Powder River (Montana, USA) since 1977 makes it perfect laboratory investig...

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...