沼液穴灌土壤水分运移的交汇入渗特征

发布时间：2019-04-01 06:41

【摘要】：通过室内试验研究不同沼液浓度(原液与水的体积比为1∶4、1∶6、1∶8、CK)和穴孔直径(3、5、7 cm)对沼液穴灌土壤水分运移交汇入渗特征的影响。结果显示:相同入渗时间内,累积入渗量随沼液浓度的增大而减小;相同沼液浓度条件下,土壤水分累积入渗量随穴孔直径的增大而增大,土壤水分入渗速率随入渗距离的增大而减小;在相同穴孔直径及入渗位置,沼液浓度越大,土壤入渗速率越小;在相同入渗位置,随穴孔直径的增加,土壤入渗速率逐渐增加;Kostiakov入渗模型准确描述了累积入渗量随入渗时间增加而增加的关系,且模型拟合系数R2均大于0.99;沼液浓度相同时,土壤含水率为22%等值线以上的面积随着穴孔直径的增加而增大;土壤含水率为22%等值线以上的面积随沼液浓度的减小而增大。综合分析结果表明,沼液穴灌交汇入渗速率、累积入渗量及土壤含水率分布受沼液浓度、穴孔直径的影响。
[Abstract]:The effects of different biogas slurry concentrations (the volume ratios of raw liquid to water are 1 ~ 4, 1 ~ 6, 1 ~ 8, CK) and hole diameter (3, 5, 7 cm) on the infiltration characteristics of soil water transfer under biogas burrow irrigation were studied by laboratory experiments. The results showed that the cumulative infiltration decreased with the increase of biogas concentration in the same infiltration time. Under the same biogas liquid concentration, the cumulative infiltration of soil water increased with the increase of hole diameter, and the soil water infiltration rate decreased with the increase of infiltration distance. At the same hole diameter and infiltration position, the larger the biogas slurry concentration is, the smaller the soil infiltration rate is, and at the same infiltration position, the soil infiltration rate increases gradually with the increase of hole diameter. The Kostiakov infiltration model accurately describes the relationship between the cumulative infiltration amount and the infiltration time, and the fitting coefficients of the model are all more than 0.999; At the same concentration of biogas liquor, the area above 22% contours of soil moisture increased with the increase of hole diameter, and the area above 22% contours of soil moisture increased with the decrease of biogas slurry concentration. The results showed that the interflow infiltration rate, cumulative infiltration and soil water content distribution were affected by biogas slurry concentration and hole diameter.
【作者单位】：甘肃农业大学工学院;兰州理工大学西部能源与环境研究中心;西北低碳城镇支撑技术协同创新中心;
【基金】：国家自然科学基金项目(51369014,51509122)
【分类号】：S152.7

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