Simulating typhoon-induced storm hydrographs in subtropical mountainous watershed: An integrated 3-layer TOPMODEL

J. C. Huang, T. Y. Lee, S. J. Kao*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A three-layer TOPMODEL is constructed by integrating diffusion wave approach into surface flow, soil moisture deficit into inter flow and exponential recession curve function into base flow. A subtropical mountainous watershed, Heng-Chi, and 22 rain storms with various rainfall types and wide ranges of total rainfall (from 81 to 1026 mm) were applied. The global best-fitted parameter set gives an average efficient coefficient of 82% for calibration and 80% for validation. Sensitivity analysis reveals that soil transmissivity dominates the discharge volume and recession coefficient dominates the hydrograph shape in TOPMODEL framework. Over 90% observed discharges of validation events falls within the 90% confidence interval derived form calibration events. The resembling performances between calibration and validation as well as good results of the confidence interval demonstrate the capability of 3-layer TOPMODEL on simulating cyclones with various rainfall intensity and pattern in subtropical watershed. Meanwhile, the upper confidence limit is suggested preferably when considering flood assessment.

Original languageEnglish
Pages (from-to)27-40
Number of pages14
JournalHydrology and Earth System Sciences
Volume13
Issue number1
DOIs
Publication statusPublished - 2009
Externally publishedYes

ASJC Scopus subject areas

  • Water Science and Technology
  • Earth and Planetary Sciences (miscellaneous)

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