Calibrating the lyne-hollick filter for baseflow separation based on catchment response time

Nagy, Eszter Dóra and Szilágyi, József and Torma, Péter (2024) Calibrating the lyne-hollick filter for baseflow separation based on catchment response time. JOURNAL OF HYDROLOGY, 638. No. 131483. ISSN 0022-1694

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Abstract

The physically meaningful separation of baseflow from the observed streamflow time series is still an unresolved problem in hydrology. This study provides a novel method that builds upon catchment response time to formulate an optimization criterion for calibrating the Lyne-Hollick filter. Catchment response time parameters, including time of concentration (Tc) and time to equilibrium (Te), can be derived from observed precipitation and discharge time series. A range for the ratio of these two has already been derived on a physical basis. In the presented approach, the parameter of the Lyne-Hollick filter is calibrated so that the ratio of Tc and Te falls between a physically plausible range. The proposed method was tested in 25 catchments, and the results were compared to those derived in a previous study. The Pearson correlation coefficient improved from 0.654 to 0.862 between Tc and the lag time when applying the proposed calibration procedure.

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