Shuitu Baochi Xuebao (Jun 2024)
The Relationship Between Soil Crust and Infiltration Under Simulation Continuous and Intermittent Precipitation
Abstract
[Objective] This study was aimed at investigating the variation relationship between soil crust and infiltration performance under continuous and intermittent rainfall conditions. [Methods] Three typical cultivated layer loesses were selected, and indoor simulated rainfall experiments were conducted to analyze the relationship between soil crust strength, cohesion, and infiltration performance under different rainfall conditions. [Results] (1) The infiltration performance decreased with the increase of continuous rainfall duration and intermittent rainfall events; under the same rainfall duration and intensity, the desilting effect of intermittent rainfall was higher than that of continuous rainfall. (2) Soil crust strength and cohesion increased with the increase of continuous rainfall duration and intermittent rainfall events; the infiltration performance of cinnamon soil and black earth was significantly linearly correlated with crust strength and cohesion (p < 0.05). The longer the continuous rainfall duration and the more frequent the intermittent rainfall events, the greater the soil crust strength, cohesion, and desilting effect. The infiltration performance of sandy soil was significantly nonlinearly correlated with crust strength and cohesion (p < 0.05). (3) The smaller the MWD and GMD of the crust, the worse the infiltration performance and the greater the desilting effect; furthermore, the correlation analysis results showed that the impact of intermittent rainfall on infiltration performance is higher. [Conclusion] Finally, under the same rainfall intensity, intermittent rainfall can form a more solid crust, which has a stronger weakening effect on soil infiltration performance. This study can provide a reference for the prevention and control of soil and water loss on the Loess Plateau and the effective utilization of water resources
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