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Lag prediction in ungauged basins: an investigation through actual data of the upper Tiber River valley
Author(s) -
Melone F.,
Corradini C.,
Singh V. P.
Publication year - 2002
Publication title -
hydrological processes
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.222
H-Index - 161
eISSN - 1099-1085
pISSN - 0885-6087
DOI - 10.1002/hyp.313
Subject(s) - lag , structural basin , kinematic wave , drainage basin , geology , channel (broadcasting) , variable (mathematics) , hydrology (agriculture) , cover (algebra) , environmental science , mathematics , surface runoff , computer science , geomorphology , geotechnical engineering , geography , ecology , cartography , mechanical engineering , computer network , mathematical analysis , engineering , biology
A comparative analysis of a variety of relationships for prediction of basin lag is performed by applying them to 23 basins located in the same geographical area and characterized by a rather similar vegetative cover. The results of computations indicate that a lag–area relationship with two constant parameters is the best predictor for most basins; under different vegetative covers in the same basin only one parameter should be variable. For a few other basins characterized by an anomalous drainage channel network of low density, such a relationship can lead to unacceptable errors. Thus, there is a need for an additional relationship to overcome this difficulty, but a larger number of anomalous basins would be required for its determination. An alternative procedure, based on the use of the non‐linear kinematic wave, which at least allows singling out the cases where a specific lag–area relationship is not reliable, is proposed. This procedure, therefore, represents a partial but very useful solution to avoid considerable errors in hydrological practice. Copyright © 2002 John Wiley & Sons, Ltd.