Volume 20, Issue 20 pp. 4335-4349
Research Article

Comparative modelling of two catchments in Taiwan and England

Yu-Chi Wang

Yu-Chi Wang

Department of Hydraulic and Ocean Engineering, National Cheng-Kung University, No. 1, Ta-Hsueh Rd, Tainan, Taiwan 701, ROC

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Dawei Han

Dawei Han

Water and Environmental Management Research Centre, University of Bristol, Bristol BS8 1TR, UK

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Pao-Shan Yu

Corresponding Author

Pao-Shan Yu

Department of Hydraulic and Ocean Engineering, National Cheng-Kung University, No. 1, Ta-Hsueh Rd, Tainan, Taiwan 701, ROC

Department of Hydraulic and Ocean Engineering, National Cheng-Kung University, No. 1, Ta-Hsueh Rd., Tainan, Taiwan 701, ROC.===Search for more papers by this author
I. D. Cluckie

I. D. Cluckie

Water and Environmental Management Research Centre, University of Bristol, Bristol BS8 1TR, UK

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First published: 01 November 2006
Citations: 7

Abstract

A comparative modelling of two catchments of similar sizes in Taiwan and England is described. In the study, despite its success in many Taiwanese catchments, including the Yan-Shui Creek catchment in this study, the distributed model GBDM was initially found unsuitable when applied to the Brue catchment in South West England. However, the simulations are much better after revising the infiltration capacity. Further exploration reveals several interesting findings. (1) The infiltration computation based on soil characteristics and classifications is unreliable in the model. Other factors, such as climate, farming practice and vegetation cover, could have a much more significant impact. (2) The application of the GBDM far away from its ‘home country’ unveils a possible weakness of such a model for being ‘underfitting’. The fact that an ‘adjustment factor’ added in the model could improve both its calibration and validation may indicate that there is a room to improve the GBDM structure for catchments outside Taiwan. (3) The study illustrates the difficulty in creating a universal distributed model that could suit all possible hydrological environments, under the constraint of model parameter parsimony to minimize the ‘equifinality’ problem. Copyright © 2006 John Wiley & Sons, Ltd.

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