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Downward approach to hydrological model developmentedited by: Malcolm G. Anderson, Jeffrey J. Mcdonnell |
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Notes for this articleKlemes (1983) defines the downward approach as the “route that starts with trying to find a distinct conceptual node directly at the level of interest (or higher) and then looks for the steps that could have led to it from a lower level”. p.2083
It recognizes that the nature of the whole system is different from the sum of its parts, and that properties of individual processes or components are not intrinsic properties of the whole system, and so any study of the individual processes or components is carried out only from the point of view of understanding the whole system. Consequently, the focus is much more on the interactions, feedbacks, and functional relationships amongst various parts, and their relationship to the whole system behavior.
p. 2083
Depending on the objectives of the model building exercise, however, the downward approach can proceed further – not satisfied with extracting a model structure and parameters from data, it can seek to refine the model by enabling it to use other information available at the same or lower level of scale. p. 2084.
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