Sigmoidal water retention function with improved behaviour in dry and wet soils

نویسندگان

چکیده

Abstract. A popular parameterized soil water retention curve (SWRC) has a hydraulic conductivity associated with it that can have physically unacceptable infinite slope at saturation. The problem was eliminated before by giving the SWRC non-zero air entry value. This improved version still an asymptote dry end, which limits its usefulness for conditions and causes integral to diverge commonly occurring parameter values. We therefore joined parameterizations' sigmoid midsection logarithmic section ending zero content finite matric potential, as done previously power-law-type SWRC. selected five parameterizations had been proven produce unproblematic near-saturation conductivities fitted these our new data from 21 soils. branch gave more realistic extrapolations into end of both curves than asymptotic branch. tested original curve, first improvement, second improvement feeding them numerical model calculated evapotranspiration deep drainage nine combinations soils climates. robust other two. better able substantial drop during early stages drying earlier improvement. It generated smaller amounts evenly distributed compared spiked response rainfall produced

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ژورنال

عنوان ژورنال: Hydrology and Earth System Sciences

سال: 2021

ISSN: ['1607-7938', '1027-5606']

DOI: https://doi.org/10.5194/hess-25-983-2021