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)

Roques, Clément; Rupp, David E.; Jachens, Elizabeth R.; Selker, John S.

doi:10.1002/2017wr022085

Cited by 2 publications

(3 citation statements)

References 10 publications

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“…We thank Roques and colleagues (Roques et al, 2018, hereinafter referred to as RRJS) for their interest in our work (Liang et al, 2017) on base flow recession analysis. We provide detailed responses to the comments raised by RRJS below.…”

Section: Introduction and Discussionmentioning

confidence: 99%

Reply to Comment by Roques et al. on “Base Flow Recession from Unsaturated‐Saturated Porous Media considering Lateral Unsaturated Discharge and Aquifer Compressibility”

Liang

Zhang

et al. 2018

Water Resources Research

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Roques et al. (, https://doi.org/10.1002/2017WR022085) claims that they have proposed an exponential time step (ETS) method to improve the computing method of Liang et al. (, https://doi.org/10.1002/2017WR020938) which used a constant time step (CTS) method on the derivative for dQ/dt in field data, where Q is the base flow discharge and t is the time since the start of base flow recession. This reply emphasizes that the main objective of Liang et al. (, https://doi.org/10.1002/2017WR020938) was to develop an analytical model to investigate the effects of the unsaturated flow on base flow recession, not on the data interpretation methods. The analytical model indicates that the base flow recession hydrograph behaves as dQ/dt ∼aQb with the exponent b close to 1 at late times, which is consistent with previous theoretical models. The model of Liang et al. (, https://doi.org/10.1002/2017WR020938) was applied to field data where the derivative of dQ/dt was computed using the CTS method, a method that has been widely adopted in previous studies. The ETS method proposed by Roques et al. (, https://doi.org/10.1016/j.advwatres.2017.07.013) appears to be a good alternative but its accuracy needs further validation. Using slopes to fit field data as proposed by Roques et al. (, https://doi.org/10.1002/2017WR022085) appears to match data satisfactorily at early times whereas it performs less satisfactorily at late times and leads to the exponent b being obviously larger than 1.

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Section: Introduction and Discussionmentioning

confidence: 99%

Reply to Comment by Roques et al. on “Base Flow Recession from Unsaturated‐Saturated Porous Media considering Lateral Unsaturated Discharge and Aquifer Compressibility”

Liang

Zhang

et al. 2018

Water Resources Research

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“…This usually entails excluding discharges in the analysis in which rainfall occurred in the present and several prior time‐steps (Brutsaert & Nieber, 1977). In addition, the first day of recession is excluded to ensure the recession is unaffected by overland flow (Roques, Rupp, Jachens, & Selker, 2018). More specific details are provided by Brutsaert (2008).…”

Section: Modeling Baseflowmentioning

confidence: 99%

“…More specific details are provided by Brutsaert (2008). To define adequately a daily recession for recession slope analysis, a minimum of 7 days is recommended by Roques et al (2018, p. 3218). For a detailed discussion see Dralle, Karst, Charalampous, Veenstra, and Thompson (2017).…”

Section: Modeling Baseflowmentioning

confidence: 99%

Baseflow and transmission loss: A review

McMahon

Nathan

2021

WIREs Water

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There is an extensive literature dealing with the interaction between groundwater and surface water, and this includes major reviews on baseflow, transmission losses, baseflow recession analysis, and broader aspects of low flows. Although these are mature topics in hydrology, they continue to attract strong interest, with hundreds of papers published in leading journals over the past 20 years. Our comprehensive review of the relevant literature focusses in detail on the use of linear and nonlinear models of recession discharge, and on transmission loss. From this review we identify three approaches to understanding recession, namely (a) theoretical approaches based on the Boussinesq equation, (b) applications of recession slope analysis, and (c) estimates of transmission loss by input–output water balance. We review the application of these techniques to ephemeral and humid areas and note the wide adoption of linear models despite most researchers accepting that the processes are nonlinear. Few papers address the characteristics of groundwater flow to ephemeral streams from unconfined aquifers. Although initially considered an ephemeral arid/semi‐arid stream feature, transmission loss occurs in streams in humid areas. Interestingly, we identify a significant omission in the literature, in that while it is common to observe nonlinear behavior in streamflow recessions, little explicit account has been given to the role of transmission loss which can be an important factor in identifying the structure of nonlinear recession models. This article is categorized under: Science of Water > Hydrological Processes

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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)

Cited by 2 publications

References 10 publications

Reply to Comment by Roques et al. on “Base Flow Recession from Unsaturated‐Saturated Porous Media considering Lateral Unsaturated Discharge and Aquifer Compressibility”

Reply to Comment by Roques et al. on “Base Flow Recession from Unsaturated‐Saturated Porous Media considering Lateral Unsaturated Discharge and Aquifer Compressibility”

Baseflow and transmission loss: A review

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