Local ‐ scale evaporation and water loss distribution in surface soil as related to near‐surface wind conditions and surface geometry

T. G. Poulsen*, Taining Li, Tianjian Lu, Han Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Local (cm) scale water loss distribution and evaporation in soil with flat and furrowed surfaces as a function of near-surface wind speed and wind direction was investigated. Four levels of average main wind speed (10 cm above furrow ridge summits, 0, 1, 3 and 5 m·s−1), three main wind directions (compared to the direction of the furrows, 0°, 45° and 90°) and two levels of relative air humidity (70% and 86%) were considered. Experiments were conducted under controlled (wind tunnel) conditions, using 50 cm diameter and 15 cm height soil samples. For furrowed samples, 6 cm high ridges with 12 cm distance between ridge tops were used. Resulting wind speed profiles above ridge tops were relatively similar (for the same main wind speed), regardless of wind direction, but differed greatly in the valleys between ridges depending on especially wind direction. Strong indication of standing eddies on the lee side of furrow ridges for wind directions ≥45° was found. Local evaporative water loss spatial distribution in furrowed soil, was strongly dependent on wind direction, while local evaporation rates depended strongly on main wind speed and relative humidity level. Significantly higher evaporative water losses were observed at the wind-exposed ridge slopes (for wind directions ≥45°) compared to lee slopes.
Original languageEnglish
JournalEuropean Journal of Soil Science
DOIs
StatePublished - 12 Nov 2021

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