Regionalization of unit hydrograph parameters: 1. Comparison of regression analysis techniques |
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| Authors: | Y -K Tung K -C Yeh J -C Yang |
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| Institution: | (1) Wyoming Water Resources Center & Statistics Department, The University of Wyoming, 82071 Laramie, WY, USA;(2) Department of Civil Engineering, National Chiao-Tung University, Hsinchu, Taiwan, Republic of China |
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| Abstract: | Hydrologic regionalization is a useful tool that allows for the transfer of hydrological information from gaged sites to ungaged
sites. This study developed regional regression equations that relate the two parameters in Nash's IUH model to the basin
characteristics for 42 major watersheds in Taiwan. In the process of developing the regional equations, different regression
procedures including the conventional univariate regression, multivariate regression, and seemingly unrelated regression were
used. Multivariate regression and seeming unrelated regression were applied because there exists a rather strong correlation
between the Nash's IUH parameters. Furthermore, a validation study was conducted to examine the predictability of regional
equations derived by different regression procedures. The study indicates that hydrologic regionalization involving several
dependent variables should consider their correlations in the process of establishing the regional equations. The consideration
of such correlation will enhance the predictability of resulting regional equations as compared with the ones from the conventional
univariate regression procedure. |
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| Keywords: | Hydrologic regionalization unit hydrograph regression analysis multivariate regression seemingly unrelated regression validation |
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