摘要
为进一步认识砂夹垆土壤水分运动的基本规律,采用数值模拟的方法,研究夹层土质、夹层埋深、夹层厚度、初始含水率和压力水头对砂夹垆土壤水分运动的影响.结果表明,砂夹垆土壤水分运动与均质土存在较大差异,入渗过程表现为与均质土相同阶段、阻水减渗阶段和稳渗阶段;湿润锋进入夹层后,累积入渗量与入渗时间符合线性关系;土壤初始含水率和压力水头对砂夹垆土壤水分运动影响较小,夹层土质、夹层厚度和夹层埋深对砂夹垆土壤水分运动影响较大.在节水灌溉技术和工程防渗技术中,应重点考虑夹层质地、厚度和埋深.
In order to further understand the basic law of soil moisture movement in interlayer of sand with loessal soil, the numeric simulation method was used to investigate the influence of soil nature, burying depth, thickness, initial moisture content, and pressure head of the interlayer on the soil moisture movement in the interlayer of sand with loessal soil. The result showed that the soil moisture movement in the interlayer of sand with toessal soil would be much difference from that in homogeneous soil. Its water infiltration process would exhibit three stages as follows, the same stage as homogenedus soil, water-re- sistance infiltration-reduction stage, and steady infiltration stage. The cumulative infiltration quantity and infiltration time would exhibit a linear relationship when wetting front enters into the interlayer. Initial moisture content and pressure head would have less effect on soil moisture movement in the interlayer of sand with loessal soil. Soil water movement of sand with loessal soil interlayer would be significantly affected by the soil property, thickness, and burying depth of the interlayer. In the water-saving irrigation and engineering seepage control technique, the emphasis should be given to the soil nature, thickness, and depth of the interlayer.
出处
《兰州理工大学学报》
CAS
北大核心
2017年第1期61-66,共6页
Journal of Lanzhou University of Technology
基金
国家自然科学青年基金(51409137
51269008)
甘肃省自然科学青年基金(145RJYA293)
关键词
砂夹垆
土壤水分运动
影响因素
数值模拟
HYDRUS-1D
sand-loessal soil interlayer
soil moisture movement
influencing factors
numerical simula-tion
HYDRUS-1 D
