A Simple Physical Model of River Meandering
نویسندگان
چکیده
منابع مشابه
A Simple Model of River Meandering and its Comparison to Natural Channels
We develop a new method for analysis of meandering channels based on planform sinuosity. This analysis objectively identifies three channel reach lengths based on sinuosity measured at those lengths: the length of typical, simple bends; the length of long, often compound bends; and the length of several bends in sequence that often evolve from compound bends to form multi-bend loops. These leng...
متن کاملRiver meandering dynamics.
The Ikeda, Parker, and Sawai river meandering model is reexamined using a physical approach employing an explicit equation of motion. For periodic river shapes as seen from above, a cross-stream surface elevation gradient creates a velocity shear that is responsible for the decay of small-wavelength meander bends, whereas secondary currents in the plane perpendicular to the downstream direction...
متن کاملCritical wavelength for river meandering.
A fully nonlinear modal analysis identifies a critical centerline wave number q(c) for river meandering that separates long-wavelength bends, which grow to cutoff, from short-wavelength bends, which decay. Exact, numerical, and approximate analytical results for q(c) rely on the Ikeda, Parker, and Sawai [J. Fluid Mech. 112, 363 (1981)] model, supplemented by dynamical equations that govern the ...
متن کاملSignificance of cutoff in meandering river dynamics
Porto, the institutional repository of the Politecnico di Torino, is provided by the University Library and the IT-Services. The aim is to enable open access to all the world. Please share with us how this access benefits you. Your story matters. [1] The occurrence of cutoff events, although sporadic, is a key component in the complex dynamics of meandering rivers. In the present work, we show ...
متن کاملModification 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...
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ژورنال
عنوان ژورنال: Journal of Geography, Environment and Earth Science International
سال: 2014
ISSN: 2454-7352
DOI: 10.9734/jgeesi/2014/14888