Performances of Rainfall-Runoff Models Calibrated over Single and Continuous Storm Flow Events

Accurate parameter estimation is important for reliable rainfall-runoff modeling. Prior studies emphasize that a sufficient length of continuous events is required for model calibration to overcome the effect of initial conditions. This paper investigates the feasibility of calibrating rainfall-runoff models over a number of limited storm flow events. For a subcatchment having a moderate influence from initial soil moisture conditions, this study shows that rainfall-runoff models could still be calibrated reliably over a set of representative events provided that the events cover a wide range of peak flow, total runoff volume, and initial soil moisture conditions. This approach could provide an alternative calibration strategy for a small watershed that has a limited data length but consists of runoff events with a wide range of magnitudes. Compared to continuous-event calibration, event-based calibration appears to perform better in simulating the overall shape of hydrograph, peak flow and time to peak. However, continuous-event calibration was found to be more reliable in providing runoff volume, suggesting that continuous-event calibration should still be used when runoff volume is the main concern of a study.

  • Availability:
  • Supplemental Notes:
    • Abstract reprinted with permission from ASCE
  • Authors:
    • Tan, Stephen Boon Kean
    • Chua, Lloyd Hock Chye
    • Shuy, Eng Ban
    • Lo, Edmond Yat-Man
    • Lim, Lai Wan
  • Publication Date: 2008-7

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01104204
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 11 2008 6:02PM