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Comment on “Base Flow Recession from Unsaturated‐Saturated Porous Media considering Lateral Unsaturated Discharge and Aquifer Compressibility” by Liang, X., H. Zhan, Y.‐K. Zhang, and K. Schilling (2017)
Author(s) -
Roques Clément,
Rupp David E.,
Jachens Elizabeth,
Selker John S.
Publication year - 2018
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 - 10.1002/2017wr022085
Subject(s) - vadose zone , recession , derivative (finance) , flow (mathematics) , constant (computer programming) , porous medium , exponential function , compressibility , aquifer , mathematics , geology , mechanics , calculus (dental) , thermodynamics , porosity , geotechnical engineering , computer science , physics , keynesian economics , mathematical analysis , groundwater , economics , geometry , financial economics , programming language , medicine , dentistry
Liang et al. ([Liang, X., 2017]) presented an analysis of the impacts of unsaturated zone processes on streamflow recession using methodology from Brutsaert and Nieber ([Brutsaert, W., 1977]) with a constant time step in computation of the time derivative of flow. Over the past 10 years, many authors have demonstrated that this method may produce artifacts that lead to incorrect interpretations. To demonstrate the impact of the choice of analysis methods, this comment presents an estimation of recession parameters using the Liang et al. ([Liang, X., 2017]) discharge data that eliminates artifacts introduced through the constant time step. Here we use the exponential time step method, which revealed recession coefficient b greater than 1 which is inconsistent with the fitting framework used in Liang et al. ([Liang, X., 2017]).