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Flow hydraulic characteristics and dynamic erodibility of saline-sodic soil slopes for coastal areas under simulated rainfall conditions
Archives of Agronomy and Soil Science ( IF 2.3 ) Pub Date : 2020-11-18
Dongdong Liu, Dongli She

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 (R2 = 0.4 and 0.6). The stream power equation SL = Kω (ωωcr ) outperforms both hydraulic shear stress equations [SL = Kτ (ττcr )3/2; SL = Kτ (ττcr )]. In most cases, the soil erodibility exponentially increases to a maximum and then exponentially decreases (R2 > 0.6). Consequently, the dynamic changes in the saline-sodic soil erodibility during a rainfall event cannot be neglected.



中文翻译:

模拟降雨条件下滨海盐碱土坡的水流特性和动态侵蚀性

摘要

滩涂开垦会产生一些开挖的盐碱土坡。但是,盐碱土质边坡的水力流动特性和动态侵蚀性研究很少。进行这项研究以量化土壤容重(1.35和1.40 g cm -3),降雨强度(85、110和125 mm h -1)和坡度梯度(11 °,22 °和35)的影响°)在模拟降雨条件下盐碱土坡的水力特性和土壤易蚀性。平均沉积物损失随坡度梯度(pr = 0.9,p <0.01),降雨强度(pr = 0.6,p <0.05)和土壤容重(pr = 0.6,p <0.05)显着增加。水力剪切应力(对于所有土壤容重(R 2分别为0.4和0.6),τ和流功率(ω)是良好的泥沙流失预测指标。流功率方程小号大号= K ωω - ω CR)优于两个液压剪应力方程[小号大号= K ττ - τ CR3/2 ; 小号大号= K ττ - τ CR)。在大多数情况下,土壤可蚀性呈指数增长到最大值,然后呈指数下降(R 2 > 0.6)。因此,不能忽略降雨事件期间盐碱土壤易蚀性的动态变化。

更新日期:2020-11-18
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