ESTIMATION OF ROUGHNESS PROFILE IN TRAPEZOIDAL OPEN CHANNELS. TECHNICAL NOTE

In the well-known de Saint Venant equations, the bed roughness-coefficient cannot be measured directly and therefore needs to be estimated. The estimation process is referred to as parameter identification, which is a mathematical process based on using the difference between the solution of the model equations and the measured system response. This paper introduces an approach for solving the parameter identification problem in the de Saint Venant equations. The method proposed is widely used in gas dynamics; however, it has not been used before for unsteady problem identification of open channel flow parameters. Although the proposed solution procedure is applied to the bed roughness-coefficient, it can be used for other parameters, such as cross-sectional area and bed width. Starting with an initial guess of the roughness coefficient, the algorithm iteratively improves the guesses in the direction of the gradient of the least square criterion. The gradient is obtained by means of a variational approach, while the conditions of the criterion minimum are identified by the general method of indefinite Lagrangian multipliers.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/8672558
• Corporate Authors:

  American Society of Civil Engineers

  1801 Alexander Bell Drive
  Reston, VA  United States  20191-4400
• Authors:
  • Atanov, G A
  • Evseeva, E G
  • Meselhe, E A
• Publication Date: 1999-3

Language

• English

Media Info

• Features: Appendices; Figures; References;
• Pagination: p. 309-312
• Serial:
  • Journal of Hydraulic Engineering
  • Volume: 125
  • Issue Number: 3
  • Publisher: American Society of Civil Engineers
  • ISSN: 0733-9429
  • Serial URL: https://ascelibrary.org/journal/jhend8

Subject/Index Terms

• TRT Terms: Algorithms; Case studies; Channel flow; Channels (Waterways); Estimating; Iterative methods; Lagrangian functions; Least squares method; Mathematical models; Roughness; Roughness coefficient
• Subject Areas: Highways; Hydraulics and Hydrology; I26: Water Run-off - Freeze-thaw;

Filing Info

• Accession Number: 00762769
• Record Type: Publication
• Files: TRIS
• Created Date: Apr 13 1999 12:00AM