| 付智勇,李朝霞,蔡崇法,郭忠录.不同起始条件下坡面薄层紫色土水分和壤中流响应[J].水利学报,2011,42(8): |
| 不同起始条件下坡面薄层紫色土水分和壤中流响应 |
| Impact of boundary conditions on soil water and subsurface flow in shallow purple soil slope |
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| DOI： |
| 中文关键词: 壤中流 优先流 薄层紫色土 降雨强度 结皮 |
| 英文关键词: subsurface flow preferential flow shallow purple soil rainfall intensity surface seal |
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| 中文摘要: |
| 通过原位人工模拟降雨试验，运用数理统计方法对描述土壤水分过程和壤中流过程的参数进行了分析，定量研究了降雨强度和表土结皮程度 （用0~5mm表土容重表征） 对薄层紫色土坡面土壤水分和壤中流的影响。结果表明:（1） 土壤水分湿润峰平均运移速率0.28~1.63mm/s之间，优先流特征明显；（2） 降雨强度和表土结皮程度是影响土壤水分过程和壤中流过程的主要素，降雨强度增加有利于优先流的发生和发展，而表土结皮的形成是阻碍优先流发生和发展的主要原因。 |
| 英文摘要: |
| By applying mathematical statistics methods，the parameters of the water-content wave and sub?surface flow hydrograph which derived from in-situ simulated rainfall were analyzed，and the effects of rain?fall intensity and surface soil bulk density（0~5mm depth）on subsurface flow of a shallow purple soil slope was studied. The results show that the wetting front velocities are in the range from 0.28 to 1.63mm/s with obvious features of preferential flow，which are much higher than the velocities expected from flows that are driven by the combined gradients of gravity and capillarity. Rainfall intensity and surface soil bulk density are major factors affecting the soil water movement and subsurface flow. The increase of rainfall intensity facilitates the occurrence and development of preferential flow，while surface seal is the main reason impedes preferential flow. |
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