Flow hydraulic characteristics and dynamic erodibility of saline-sodic soil slopes for coastal areas under simulated rainfall conditions. Issue 5 (16th April 2022)

• Record Type: Journal Article
• Authors: Liu, Dongdong; She, Dongli
• Is Part Of: Archives of agronomy and soil science. Volume 68:Issue 5(2022)
• Page Start: 646
• Page End: 660
• Publication Date: 2022-04-16
• Subjects: Saline–sodic soil -- sediment loss -- hydraulic flow characteristics -- soil erodibility; Horticulture -- Periodicals; Soils -- Periodicals; 630.5
• DOI: 10.1080/03650340.2020.1849623
• Languages: English
• ISSNs: 0365-0340

Abstract

ABSTRACT: Tidal flat reclamation generates several excavated saline-sodic soil slopes. However, there are limited studies on the hydraulic flow characteristics and dynamic erodibility of saline-sodic soil slopes. This study was conducted to quantify the effects of the soil bulk density (1.35 and 1.40 g cm −3 ), rainfall intensity (85, 110, and 125 mm h −1 ), and slope gradient (11°, 22°, and 35° ) on the hydraulic characteristics and soil erodibility of saline–sodic soil slopes under simulated rainfall conditions. The mean sediment loss significantly increases with the slope gradient (pr = 0.9, p < 0.01), rainfall intensity (pr = 0.6, p < 0.05), and soil bulk density (pr = 0.6, p < 0.05). The hydraulic shear stress ( τ ) and stream power ( ω ) are good sediment loss predictors for all soil bulk densities (R 2 = 0.4 and 0.6). The stream power equation SL = Kω ( ω − ωcr ) outperforms both hydraulic shear stress equations [ SL = Kτ ( τ − τcr ) 3/2 ; SL = Kτ ( τ − τcr )]. In most cases, the soil erodibility exponentially increases to a maximum and then exponentially decreases ( R 2 > 0.6). Consequently, the dynamic changes in the saline-sodic soil erodibility during a rainfall event cannot be neglected.