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Objective, observations‐based, automatic estimation of the catchment response timescale
Author(s) -
Morin Efrat,
Georgakakos Konstantine P.,
Shamir Uri,
Garti Rami,
Enzel Yehouda
Publication year - 2002
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/2001wr000808
Subject(s) - surface runoff , drainage basin , environmental science , hydrology (agriculture) , estimation , range (aeronautics) , magnitude (astronomy) , series (stratigraphy) , soil science , geology , geography , cartography , ecology , geotechnical engineering , paleontology , materials science , physics , management , astronomy , economics , composite material , biology
A new characteristic timescale of a catchment is presented, the response timescale (RTS). It is a range of averaging time intervals which, when applied to catchment rainfall, yield smoothed time series that best approximate that of the resultant runoff. In determining the RTS, nothing is assumed about the nature of the rainfall‐runoff transformation. In addition, this new measure is shown to be robust against measurement errors. An objective, automatic, observations‐based algorithm is described that introduces the concept of peaks density for the estimation of RTS. Estimation is exemplified for single and multiple rainfall‐runoff events through application to small catchments in Panama and Israel. In all cases, relatively stable values of response timescale are obtained. It is concluded that at least for the case studies, the response timescale is an intrinsic characteristic of the catchment and it is generally expected to be different from the catchment lag time and time of concentration.