Institute of Agrophysics, Polish Academy of Sciences, Lublin, Poland.
PLoS One. 2023 May 12;18(5):e0285611. doi: 10.1371/journal.pone.0285611. eCollection 2023.
The splash phenomenon and the scale of the surface deformation of post-fire soils in the variants of various hydrophobicity and moisture content were studied. Splash erosion is the result of the impact of a single water drop and was analysed using high-speed cameras, while the surface deformation was parameterized using a structured light scanner. The extremely water-repellent variant (dry_V) showed distinct differences, expressed primarily in the number of ejected particles, which was 2.5 times higher than in the four soils with lower levels of hydrophobicity. It was also observed that as a result of the drop impact onto an extremely hydrophobic soil surface, a form known as liquid marble was created inside the crater. Soil moisture content determined the manner, scale and dynamics of the splash erosion. In the case of wet soils, the phenomenon proceeded up to five times faster, and as a result of the drop impact, a large number of fine particles were ejected, which reached nearly twice the velocities and three times the displacement distances compared to the dry soil group. However, the particles and/or aggregate splashed on the dry samples were larger, which also translated into the formation of craters up to twice as extensive as those in the wet soils.
研究了不同疏水性和含水量变体中火后土壤的飞溅现象和表面变形规模。飞溅侵蚀是单个水滴冲击的结果，使用高速摄像机进行了分析，而表面变形则使用结构光扫描仪进行了参数化。极疏水的变体（干_V）表现出明显的差异，主要表现在喷出的颗粒数量上，比疏水性较低的四种土壤高出 2.5 倍。还观察到，由于液滴撞击到极疏水的土壤表面，在弹坑内部形成了一种称为液珠的形式。土壤湿度决定了飞溅侵蚀的方式、规模和动力学。在潮湿土壤的情况下，这一现象的速度快了五倍，并且由于液滴的冲击，大量细小颗粒被喷出，其速度达到干燥土壤组的近两倍，位移距离达到三倍。然而，喷溅在干燥样品上的颗粒和/或团聚体较大，这也导致弹坑的形成范围比潮湿土壤中的弹坑大了近两倍。
