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Soil moisture stora...
Soil moisture storage estimation based on steady vertical fluxes under equilibrium
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- Amvrosiadi, Nino (author)
- Uppsala universitet,Luft-, vatten- och landskapslära
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- Bishop, Kevin (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för vatten och miljö,Department of Aquatic Sciences and Assessment,Swedish Univ Agr Sci, Dept Aquat Sci & Assessment, Uppsala, Sweden
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- Seibert, Jan (author)
- Uppsala universitet,Luft-, vatten- och landskapslära,Univ Zurich, Dept Geog, Zurich, Switzerland
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(creator_code:org_t)
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- Elsevier B.V. 2017
- 2017
- English.
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In: Journal of Hydrology. - : Elsevier B.V.. - 0022-1694 .- 1879-2707. ; 553, s. 798-804
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Abstract
Subject headings
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- 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.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Oceanografi, hydrologi och vattenresurser (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Oceanography, Hydrology and Water Resources (hsv//eng)
Keyword
- 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
Publication and Content Type
- ref (subject category)
- art (subject category)
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