布哈河流域土壤冻结对入渗影响研究

Effects of soil freezing on infiltration in Buha river basin

为了研究在不同负温及不同初始含水量条件下的均质土壤对土壤入渗特性的影响,本研究进行了室内模拟垂向一维均质冻结土壤积水入渗试验。结果表明:(1)在垂直入渗条件下,当土壤初始含水量相同时,累积入渗量随土壤初始负温升高而增加,土壤初始负温越高,累积入渗量越大;土壤初始负温相同时,累积入渗量随初始含水量的增大而降低;(2)在冻结条件下,土壤入渗率随入渗时间的增大呈先增加后降低的过程。入渗期间,随着土壤初始温度降低,土壤剖面含水量增加的趋势减弱,土壤剖面体积含水量的变化与土壤剖面体积含冰量的变化趋势相反,当体积含冰量随深度增加时,土壤的体积含水量会相对降低。(3)当土壤初始温度相同时,试验结束时刻累积入渗量越大的试验处理,土壤温度越高。本试验结果可以为构建冻融条件下土壤入渗产流模型提供基础理论支撑。

An experiment of indoor simulated vertical one-dimensional homogeneous frozen soil infiltration is carried out in this paper in order to study the effects of homogeneous soil on soil infiltration characteristics under the different negative temperature and different initial water content.The results show that:(1)Under condition of vertical infiltration,the cumulative infiltration increases with the increase of initial negative soil temperature with the same initial soil water content;the cumulative infiltration decreases with the increase of initial water content with the same initial negative soil temperature;(2)The soil infiltration rate first increases and then decreases with the extension of infiltration time under the freezing conditions.The water content of soil profile increases with the decrease of initial soil temperature during the infiltration.The variation trend of volumetric water content of soil profile is opposite to that of ice content.The volumetric water content of soil will be decreased relatively when the volumetric ice content increases with depth.(3)The greater the cumulative infiltration at the end of the experiment is,the higher the soil temperature is with the same initial soil temperature.The experiment can provide basic theoretical support for the construction of soil infiltration runoff model under the conditions of freeze-thaw.