In this paper, we consider a class of nonlinear partial differential equations which model soil water infiltration, redistribution and extraction in a bedded soil profile irrigated by a line source drip irrigation system. By using the nonlocal conservation theorem method and the partial Lagrangian a
A new conservation law of the shallow-water equations
β Scribed by Joseph Egger
- Publisher
- John Wiley and Sons
- Year
- 1994
- Tongue
- English
- Weight
- 357 KB
- Volume
- 120
- Category
- Article
- ISSN
- 0035-9009
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β¦ Synopsis
Abstract
A new conservation law is derived from the inviscid shallowβwater equations. This law governs the spreading of a fixed quantity of fluid. The symmetries of the Lagrangian of shallowβwater flow are determined. The links of these symmetries to the new law and to other conservation laws are discussed.
π SIMILAR VOLUMES
A study of a number of current numerical schemes for the shallow water equations leads to the establishment of relationships between these schemes. Further analysis then suggests new formulations of the schemes, as well as an alternative scheme having the same key properties.
The local symmetries and conservation laws are calculated for the equations of shallow water with an axisymmetric profile of bottom under the assumption that the corresponding generating functions may depend only on all variables and their derivatives up to the second order. It is shown that if the
Numerical results are presented and compared for four conservative upwind difference schemes for the shallow water equations when applied to a standard test problem This includes consideration of the effect of treating part of the flux balance as a source, and a comparison of square-root and arithme
In recent years upwind differencing has gained acceptance as a robust and accurate technique for the numerical approximation of the one-dimensional shallow water equations. In two dimensions the benefits have been less marked due to the reliance of the methods on standard operator splitting techniqu