2D NUMERICAL MODEL OF FLOODING IN EAST BANGKOK

This paper proposes a new numerical flooding model oriented to water systems comprising large canal networks. The approach is based on the diffusion wave equation related to a modified version of the so-called "calculations with apparent cross-sectional flow areas." The mathematical formulation is based on the analogy of a porous medium characterized by a permeability depending on parameters and directions of the canal network. The "continuous medium" approach is combined with the nonnegative stable numerical algorithm (initially developed for the one-dimensional diffusion wave equation). A numerical solution of the resulting finite-difference equations requires a tangible generalization of the nonnegative algorithm to the case of coupled two-dimensional (2D) river-surface flows. Finally, the flood evolution in the lower Chao-Praya River basin (located in the eastern areas of Bangkok, Thailand) is simulated, and the computational efficiency of the proposed method is demonstrated.

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00763567
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 17 1999 12:00AM