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Estimation of the URBS model parameters for flood estimation of ungauged catchments in the upper Ping river basin, Thailand

Punpim Puttaraksa Mapiam, Nutchanart Sriwongsitanon^*

 
ABSTRACT:     Flood hydrographs are usually estimated from models on gauged catchments. Flood estimation on ungauged catchments requires relationships between model parameters and catchment characteristics. In this study, both the URBS model and Nedbor-Afstromings model (NAM) were shown to be successful in simulating flood behaviour in the upper Ping river basin, Northern Thailand. To formulate the relationships for applying to ungauged catchments, we chose the URBS model as it requires only 4 parameters whereas the NAM requires 6. The relationships between the URBS model parameters calibrated from 11 runoff stations and the corresponding catchment characteristics were adopted to estimate the URBS model parameters at 4 runoff stations in the target area as if the catchments were ungauged. The results of flood estimation obtained from the ungauged catchment approach were then compared with that gained from the gauged catchment approach. The results revealed that the proposed relationships between the URBS model parameters and catchment characteristics can be confidently applied for flood estimation of the ungauged catchments within the catchment area of the 11 stations used in the formulation process.

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* Corresponding author, E-mail: fengnns@ku.ac.th

Received 3 Jul 2008, Accepted 27 Feb 2009