Parsimonius Watershed Chep

CHAPTER 22

A Parsimonious Watershed Model
James F. Limbrunner, Richard M. Vogel, and Steven C. Chapra
Department of elegant and Environmental Engineering, Tufts University, Medford,
MA 02155, U.S.A.,
email: james.limbrunner@tufts.edu, Richard.Vogel@tufts.edu and
Steven.Chapra@tufts.edu ,
Tel: 617-627-3211, FAX: 617-627-3994
1. INTRODUCTION
There be now a very large come of landmark models for predicting
streamflow from climatic inputs and land surface characteristics as evidenced by
this book, by the 25 watershed models presented in its predecessor (Singh, 1995)
and by the 72 models reviewed in Singh and Woolhiser (2002). Alternative
temporal and spatial scales are numerous, and watershed clay sculpture philosophies
are diverse. The degree of model complexity, as indicated by number of
parameters, also varies widely. Beven (1989) suggests that in spite of the
dozens of parameters normally include in watershed models, it appears that 3
to 5 parameters should be sufficient to vomit most of the information in a
hydrologic record. Jakeman and Hornberger (1993) and others imbibe drawn
similar conclusions. A parsimonious watershed model is very careful or
economic and even sparing in its use of model parameters.




around of the watershed models described in this text, in Singh (1995)
and in Singh and Woolhiser (2002) have well in excess of 3 to 5 model
parameters, some with more than 10-20 model parameters. On the one hand,
such models are useful for detailed engineering and scientific studies of
watershed processes, to that extent on the other hand, calibration and uncertainty analyses
for such models is frequently more challenging than for parsimonious models. For
example, it can take on the beau monde of weeks to develop a realistic calibration of
the HSPF model, whereas a parsimonious model can be calibrated in less than a
day. Furthermore, operations such as validation, uncertainty analysis, and
appendix of complex models to ungaged watersheds using...If you want to get a full essay, order it on our website: Orderessay



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