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Article

A Comparative Investigation of Various Pedotransfer Functions and Their Impact on Hydrological Simulations

1
Department of Physical Geography, Faculty VI, University of Trier, Universitätsring 12, 54296 Trier, Germany
2
TUM Department of Civil, Geo and Environmental Engineering, Technical University of Munich (TUM), Arcisstrasse 21, 80333 München, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Jan Wesseling
Water 2021, 13(10), 1401; https://doi.org/10.3390/w13101401
Received: 22 April 2021 / Revised: 13 May 2021 / Accepted: 14 May 2021 / Published: 17 May 2021
(This article belongs to the Special Issue Recent Progress in Linking Soil Science and Hydrology)
Soil hydraulic properties, which are basically saturated and unsaturated hydraulic conductivity and water retention characteristics, remarkably control the main hydrological processes in catchments. Thus, adequate parameterization of soils is one of the most important tasks in physically based catchment modeling. To estimate these properties, the choice of the PTFs in a hydrological model is often made without taking the runoff characteristics of the catchment into consideration. Therefore, this study introduces a methodology to analyze the sensitivity of a catchment water balance model to the choice of the PTF. To do so, we define 11 scenarios including different combinations of PTFs to estimate the van Genuchten parameters and saturated hydraulic conductivity. We use a calibrated/validated hydrological model (WaSiM-ETH) as a baseline scenario. By altering the underlying PTFs, the effects on the hydraulic properties are quantified. Moreover, we analyze the resulting changes in the spatial/temporal variation of the total runoff and in particular, the runoff components at the catchment outlet. Results reveal that the water distribution in the hydrologic system varies considerably amongst different PTFs, and the water balance components are highly sensitive to the spatial structure of soil hydraulic properties. It is recommended that models be tested by careful consideration of PTFs and orienting the soil parameterization more towards representing a plausible hydrological behavior rather than focusing on matching the calibration data. View Full-Text
Keywords: pedotransfer functions; soil hydraulic parameterization; catchment water balance; runoff components; hydrologic modeling; spatial pattern comparison; water retention curve pedotransfer functions; soil hydraulic parameterization; catchment water balance; runoff components; hydrologic modeling; spatial pattern comparison; water retention curve
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MDPI and ACS Style

Mohajerani, H.; Teschemacher, S.; Casper, M.C. A Comparative Investigation of Various Pedotransfer Functions and Their Impact on Hydrological Simulations. Water 2021, 13, 1401. https://doi.org/10.3390/w13101401

AMA Style

Mohajerani H, Teschemacher S, Casper MC. A Comparative Investigation of Various Pedotransfer Functions and Their Impact on Hydrological Simulations. Water. 2021; 13(10):1401. https://doi.org/10.3390/w13101401

Chicago/Turabian Style

Mohajerani, Hadis, Sonja Teschemacher, and Markus C. Casper 2021. "A Comparative Investigation of Various Pedotransfer Functions and Their Impact on Hydrological Simulations" Water 13, no. 10: 1401. https://doi.org/10.3390/w13101401

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