Accession Number:

ADA101396

Title:

Stream Channel stability. Appendix K. Two-Dimensional Finite-Element Model for Routing Water and Sediment in Short Alluvial Channel Reaches,

Descriptive Note:

Corporate Author:

SOIL CONSERVATION SERVICE OXFORD MS SEDIMENTATION LAB

Personal Author(s):

Report Date:

1981-04-01

Pagination or Media Count:

61.0

Abstract:

The objective of this study is to develop a new methodology for modeling the phenomenon of sediment movement in irregular alluvial channels, scouring around obstructions, etc. The basic physical principles of conservation of mass and momentum are used to describe the fluid flow. The conservation of mass and semi-empirical equations governing sediment particle movement are adopted to establish the interaction between the sediment movement and the fluid flow. The resulting mathematical model is, unfortunately, highly nonlinear and complex. It is impractical, if not impossible, to solve it analytically. Therefore, the numerical methods of finite element and finite difference are used to obtain approximate solutions of this model. The application of the finite element method FEM to model fluid flows has progressed rapidly in recent years from the simplest linear inviscid fluid flow problems Martin, 1968 Argyris et al., 1969 to slow viscous flows Tong, 1969 Atkinson et al., 1969 Oden and Sornogyi, 1969, and finally to the solution of full Navier-Stokes equations Oden, 1970 Skiba, 1970 Olson, 1972 Oden and Wellford, 1972. However, this latter area represents an extremely large and complex field. As such, the research, although very active, can only be referred to as being in its beginning stage Olson, 1975. A summary of its recent applications to flows through porous media, shallow water circulation, and two-dimensional viscous flows had been presented by Connor and Brebbia 1976.

Subject Categories:

  • Hydrology, Limnology and Potamology
  • Soil Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE