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Soil moisture storage estimation based on steady vertical fluxes under equilibrium
Uppsala University, Sweden.ORCID iD: 0000-0003-2662-9264
2017 (English)In: Journal of Hydrology, ISSN 0022-1694, E-ISSN 1879-2707, Vol. 553, p. 798-804Article in journal (Refereed) Published
Abstract [en]

Soil moisture is an important variable for hillslope and catchment hydrology. There are various computational methods to estimate soil moisture and their complexity varies greatly: from one box with vertically constant volumetric soil water content to fully saturated-unsaturated coupled physically-based models. Different complexity levels are applicable depending on the simulation scale, computational time limitations, input data and knowledge about the parameters. The Vertical Equilibrium Model (VEM) is a simple approach to estimate the catchment-wide soil water storage at a daily time-scale on the basis of water table level observations, soil properties and an assumption of hydrological equilibrium without vertical fluxes above the water table. In this study VEM was extended by considering vertical fluxes, which allows conditions with evaporation and infiltration to be represented. The aim was to test the hypothesis that the simulated volumetric soil water content significantly depends on vertical fluxes. The water content difference between the no-flux, equilibrium approach and the new constant-flux approach greatly depended on the soil textural class, ranging between ∼1% for silty clay and ∼44% for sand at an evapotranspiration rate of 5 mm·d−1. The two approaches gave a mean volumetric soil water content difference of ∼1 mm for two case studies (sandy loam and organic rich soils). The results showed that for many soil types the differences in estimated storage between the no-flux and the constant flux approaches were relatively small.

Place, publisher, year, edition, pages
Elsevier B.V. , 2017. Vol. 553, p. 798-804
Keywords [en]
Catchment water storage, VEM, Vertical flux, Volumetric soil water content, Catchments, Digital storage, Evapotranspiration, Groundwater, Moisture, Runoff, Soil moisture, Soils, Water content, Water supply, Catchment hydrology, Equilibrium approaches, Physically based models, Soil water content, Soil water storage, Vertical equilibriums, Vertical fluxes, Water storage, Soil testing, catchment, equilibrium, estimation method, flux measurement, hillslope, hypothesis testing, infiltration, model, moisture content, soil texture, soil water, volume, water table
National Category
Oceanography, Hydrology and Water Resources
Identifiers
URN: urn:nbn:se:ri:diva-57259DOI: 10.1016/j.jhydrol.2017.08.042Scopus ID: 2-s2.0-85028734413OAI: oai:DiVA.org:ri-57259DiVA, id: diva2:1616173
Note

Funding details: 2011-4889; Funding details: Uppsala Universitet; Funding text 1: This work was supported by the Swedish Science Foundation (project number 2011-4889) and Uppsala University . All the data used in this study were kindly provided by the Krycklan Catchment Study (KCS), ( http://www.slu.se/Krycklan ). We would like to sincerely thank the anonymous reviewers and H.Y. Badger whose comments greatly improved the quality of this manuscript.

Available from: 2021-12-02 Created: 2021-12-02 Last updated: 2023-06-02Bibliographically approved

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Amvrosiadi, Nino

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