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首页> 外文期刊>MATEC Web of Conferences >Analysis of water retention in soil horizons of two open trenches on a slope of Serra do Mar, Brazil, susceptible to landslides
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Analysis of water retention in soil horizons of two open trenches on a slope of Serra do Mar, Brazil, susceptible to landslides

机译：塞拉，巴西斜坡上两次开放式沟渠水土潴留分析，易于山体滑坡

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摘要

This research presents and analyzes the results of Soil Water Characteristic Curves (SWCC) for the soil horizons (A, B and C) of two different trenches (TR3 and TR7) opened along a slope located in the Serra da Mar mountain range, Brazil. Microaggregations were observed in soil horizons of both trenches, which changed the textural classification of the soils. TR7 showed more macropores than TR3, especially on horizon C. Unimodal SWCC were obtained for soils of the horizon A for both trenches. Instead, bimodal SWCC were obtained for soils of the deeper horizons (B and C). All soil horizons showed the phenomenon of hysteresis , and it’s more expressive in the macroporosity part. In TR7 the water retention capacity is lower in B and C, facilitating the drainage, however, horizons B and C of TR3 presented greater water retention capacity for the same matric suction value. Depending on the intensity and duration of rainfall, the horizons B and C of both trenches may suffer a decrease of shear strength, without necessarily saturating. The A horizon of TR3 can undergo an erosive process for heavy and short rains.
机译：本研究介绍了两种不同沟槽（TR3和TR7）的土壤水景曲线（SWCC）的土壤水特性曲线（SWCC）的结果沿着位于Serra da Mar山脉，巴西的斜坡。在两条沟槽的土壤视野中观察到微烧结，改变了土壤的纹理分类。 TR7显示比TR3更多的宏观，特别是在地平线上，为两个沟槽的地平线A的土壤获得了单峰SWCC。相反，获得了Bimodal SWCC用于更深的视野（B和C）的土壤。所有土壤视野都显示出滞后现象，并且在大孔隙部分中更具表现力。在TR7中，B和C的水保持能力较低，促进引流，然而，TR3的视野B和C呈现出相同的测距值的更大的水保持能力。根据降雨的强度和持续时间，两个沟槽的地平线B和C可能遭受剪切强度的降低，而不需要饱和。 TR3的地平线可以接受腐蚀过程，以获得沉重和短的降雨。

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