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Author: Zverkov M. S.

NUMERICAL STUDY OF THE INFLUENCE OF ARTIFICIAL RAINFALL EFFECTIVE PRESSURE ON SOIL SPLASH

Topics: 06.01.03 Agrophysics

Abstract:

The purpose of the study was to determine the effect of effective pressure magnitude of the artificial rain drops on the mass of splashed soil as a parameter characterizing splash erosion. A total of 40 soil samples were investigated, which were splashed from droplets with a diameter of 1.73 and 2.73 mm, falling from a height of 1.0–2.5 m in increments of 0.5 m (replication fivefold). As a result of the impact of a drop with a diameter of 1.73 mm, when falling from a height of 1.0 to 2.5 m, the median mass value m of the splashed particles was respectively from 0 to 0.014 ± 0.001 g; 0 to 2.5 m – from 0.006 ± 0.002 to 0.021 ± 0.006 g, respectively (the critical value of the Student’s t test tα = 2.776 in each sample is less than the empirical te Student’s test 3.464–8.612, significance level p is less < 0.05). The median value of the effective pressure pe of a single impact of a drop with a diameter of 1.73 mm when falling from a height of 1.0 to 2.5 m was respectively from 90.95 ± 4.61 to 168.60 ± 3.52 kPa; impact of a drop with a diameter 2,73 mm falling from a height of 1.0 to 2.5 m pe was from 114.92 ± 1.80 to 205.09 ± 10.50 kPa, respectively (tα = 8.610 << te from [20.091; 61.278], p < 0,001). The statistical significance of the dependence of the splashed particles mass on the effective pressure of the raindrops impact (tα = 5.041 << te from [19.140; 62.572], p < 0.001) was revealed. A regression equation for determining the mass m of splashed soil particles depending on the effective pressure pe of a single impact is obtained. It is determined that the larger diameter dd, the fall height h and the effective pressure pe a drop has, the more soil particles (m) it can spray. The importance of preventive measures to reduce the intensity of splash erosion as a condition to prevent the development of soil degradation processes is noted.
Keywords: water erosion, drip erosion, drop, soil degradation, soil, rain, rain pressure, soil splash, sprinkling.
DOI: 10.31774/2222-1816-2019-1-168-183

For citation:
M. S. Zverkov
NUMERICAL STUDY OF THE INFLUENCE OF ARTIFICIAL RAINFALL EFFECTIVE PRESSURE ON SOIL SPLASH
Scientific Journal of Russian Scientific Research Institute of Land Improvement Problems. 2019. No 1. P. 168-183
DOI: 10.31774/2222-1816-2019-1-168-183

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