منابع مشابه
Unsteady Turbulence Characteristics in an Undular Bore
When a river mouth has a flat converging shape with a tidal range exceeding 6 to 9 m, the river may experience a tidal bore. A tidal bore is a positive surge, and the aim of the study is to detail the turbulent field beneath an undular bore. New unsteady experiments were conducted in a large channel. Turbulence measurements were performed with high-temporal resolution using side-looking acousti...
متن کاملAnalytic model for a weakly dissipative shallow-water undular bore.
We use the integrable Kaup-Boussinesq shallow water system, modified by a small viscous term, to model the formation of an undular bore with a steady profile. The description is made in terms of the corresponding integrable Whitham system, also appropriately modified by viscosity. This is derived in Riemann variables using a modified finite-gap integration technique for the Ablowitz-Kaup-Newell...
متن کاملA bound on oscillations in an unsteady undular bore
The tidal bore is a well-known phenomenon in fluid mechanics, having been observed in many rivers around the world. Two of the better known rivers where bores regularly appear are the Severn River in England [1] and the Qiantang River in China [2]. The usual circumstances in which a bore can appear develop when a tidal swell causes a difference in surface elevation in the mouth of a river or fu...
متن کاملAnalytic model for a frictional shallow-water undular bore
We use the integrable Kaup-Boussinesq shallow water system, modified by a small viscous term, to model the formation of an undular bore with a steady profile. The description is made in terms of the corresponding integrable Whitham system, also appropriately modified by friction. This is derived in Riemann variables using a modified finite-gap integration technique for the AKNS scheme. The Whit...
متن کاملUndular bore solution of the Camassa-Holm equation.
Modulation theory is developed for a periodic peakon solution of the Camassa-Holm equation. An explicit simple wave solution of these modulation equations is then derived; this simple wave describing the evolution into an undular bore of an initial step. The characteristic on which the expansion fan occurs (propagating at a nonlinear group velocity) has a turning point, illustrating the fact th...
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ژورنال
عنوان ژورنال: Journal of Fluid Mechanics
سال: 2012
ISSN: 0022-1120,1469-7645
DOI: 10.1017/jfm.2012.338