Soil moisture storage estimation based on steady vertical fluxes under equilibrium

• 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)