Articles | Volume 13, issue 1
Hydrol. Earth Syst. Sci., 13, 27–40, 2009
https://doi.org/10.5194/hess-13-27-2009
Hydrol. Earth Syst. Sci., 13, 27–40, 2009
https://doi.org/10.5194/hess-13-27-2009

  23 Jan 2009

23 Jan 2009

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

J.-C. Huang1, T.-Y. Lee1,2, and S.-J. Kao1,3 J.-C. Huang et al.
  • 1Research Center for Environmental Changes, Academia Sinica, Taipei, Taiwan
  • 2Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei, Taiwan
  • 3State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, China

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.

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