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16 Numerical Flood Simulation

Part 2. Hydroinformatics

  1. Guus S Stelling1,
  2. Adri Verwey2

Published Online: 15 APR 2006

DOI: 10.1002/0470848944.hsa025a

Encyclopedia of Hydrological Sciences

Encyclopedia of Hydrological Sciences

How to Cite

Stelling, G. S. and Verwey, A. 2006. Numerical Flood Simulation. Encyclopedia of Hydrological Sciences. 2:16.

Author Information

  1. 1

    Technical University of Delft, Department of Civil Engineering, Delft, The Netherlands

  2. 2

    WL Delft Hydraulics, Delft, The Netherlands

Publication History

  1. Published Online: 15 APR 2006

Abstract

This contribution describes the state of the art of numerical flood simulation, in particular, the models based upon hydraulic laws. Both theory and practical aspects are discussed. In the introduction, various types of applications of these models are listed with their requirements in terms of robustness, accuracy, speed of operation, and engineering staff time. After introducing the 1D Saint Venant unsteady flow equations and describing the meaning of their terms, the concepts of kinematic and diffusive wave approximations are discussed. These provide better ways of understanding the physical behavior of flood waves and demonstrate the link between hydraulic and hydrologic flood propagation models. Numerical discretization of the unsteady flow equations is introduced with special attention given to the correct and robust modeling of rapidly varying flow, as occurring around hydraulic structures, discontinuities in channel beds, and flood-generating breaches of river embankments and reservoir dams. Proceeding with the 2D flow description and its numerical discretization principles, the emergence of hybrid 1D/2D models is discussed with their different options of linking model components of flood-prone areas. The quality of models also relies very much on the availability of detailed and correct data. This contribution briefly introduces the impact of new data collection techniques on numerical flood model schematization.

Keywords:

  • numerical-simulation methods;
  • unsteady flow modeling;
  • flood wave propagation;
  • flood control;
  • flood forecasting;
  • dam break modeling;
  • flood warning;
  • flood damage assessment;
  • flood insurance