| 郑健,周鹏杰,张彦宁,殷李高,张恩继.沼液穴灌入渗影响因素分析及数值模拟研究[J].干旱地区农业研究,2018,36(6):13~20 |
| 沼液穴灌入渗影响因素分析及数值模拟研究 |
| Analysis and numerical simulation of factors influencing the hole application infiltration of biogas slurry |
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| DOI：10.7606/j.issn.1000-7601.2018.06.03 |
| 中文关键词: 沼液穴灌 数值模拟 湿润锋 入渗速率 累积入渗量 |
| 英文关键词:hole irrigation of biogas slurry numerical simulation wetting front infiltration rate cumulative infiltration |
| 基金项目:国家自然科学基金资助项目（51509122，51369014）；甘肃省高等学校科技成果转化项目（2018D-04）；甘肃省自然科学基金（18JR3RA154）；2018年杨凌示范区产学研用协同创新重大项目计划（2018CXY-14） |
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| 中文摘要: |
| 通过试验研究了不同沼液配比、穴孔直径和土壤容重对沼液穴灌入渗的影响，并采用COMSOL Multiphysics软件对入渗过程进行了数值模拟。试验设置了3个沼液配比（沼液∶水体积比为1∶4、1∶6、1∶8）和1个对照组CK（纯水），3个穴孔直径（3、5 cm和7 cm）和2个土壤容重（1.35 g·cm-3和1.45 g·cm-3）。试验结果表明：在相同时间内入渗速率、累积入渗量和湿润体体积随穴孔直径的增大而增加，随土壤容重和沼液含量的增加而减小；水平入渗距离与垂向入渗距离的比值随穴孔孔径增大而减小，湿润体形状随穴孔直径的增加逐渐由水平轴大于垂直轴的椭球体趋向于水平轴小于垂直轴；当土壤容重较大时，可增加穴孔直径和降低沼液含量来提高单位时间土壤累积入渗量；所有处理均呈现湿润锋初始阶段运移速度较快，后期逐渐变慢，并且运移速度逐渐趋于稳定的趋势；采用COMSOL Multiphysics软件能够较准确实现沼液穴灌技术中湿润锋运移和湿润体内土壤含水率变化的模拟。 |
| 英文摘要: |
| Hole application of biogas slurry is an fertigation technology under research now. To explore the effect of water ratio, hole size, and soil bulk density on soil water infiltration around the irrigation hole after hole application of biogas slurry, a series of experiments were conducted to study the influencing factors. Meanwhile, the process of soil water infiltration was simulated using software, COMSOL Multiphysics. The treatments included 3 volume ratios of biogas slurry:water (1∶4, 1∶6, and 1∶8), and a control (water only), three hole diameters (3 cm, 5 cm, and 7 cm) and two soil bulk densities (1.35 and 1.45 g·cm-3).Results showed that the infiltration rate, the cumulative infiltration, and the volume of the wetting body increased with increasing the hole diameter after the same infiltration time, but decreased with increasing soil bulk density and the slurry: water ratio. However, the ratio of the horizontal infiltration distance to vertical infiltration depth decreased with increasing hole diameter. The wetting body shape transformed from a spheroid with greater horizontal axis than the vertical axis to that with shorter horizontal axis than the vertical axis. In the case with higher soil bulk density, the cumulative infiltration in unit time was increased by increasing the hole diameter and reducing the biogas slurry:water ratio. The wetting front was advancing faster at the initial stage of hole irrigation but slowed down later and then approached steady state. Our results concluded that the process of the wetting front movement and soil moisture content variation in the wetting body can be simulated with the software, COMSOL Multiphysics. |
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