局部控制地下浸润灌溉土壤入渗特性试验研究

发布时间：2018-06-14 14:55

本文选题：设施农业 + 局部控制地下浸润灌溉　；参考：《重庆交通大学》2016年硕士论文

【摘要】：我国设施农业发展很快,为消费者提供了丰富多彩的不同品种的反季节蔬菜、水果,但其绝大多数人采用传统的灌溉方式,灌溉用水量大,采用先进的节水灌溉技术不仅可以提高水的利用率,增加种植效益,还可以改善温室作物的水环境病虫害,提高产品品质和产量。局部控制地下浸润灌溉是在参考现有技术基础上提出的具有较高节水潜力的灌水方法,它是利用地下水浸润灌溉的方式,种植槽底部局部开孔,放置在一定深度的水槽中,利用土壤的毛细管作用进行浸润灌溉的技术。研究该技术条件下土壤水分运动规律和模拟对于其熟化和推广应用具有重要意义。本文开展了温室栽培土不同容重土壤水分运动参数的测定、地下点源入渗及地下全面入渗试验,较为系统的分析了不同容重的土壤对土壤水分特征曲线、扩散率,地下点源入渗的入渗速率、累积入渗量、湿润锋运移等入渗参数的影响规律,利用Green-Ampt和Philip两种模型对实测数据进行了拟合。研究结果表明,湿润锋的推移及土壤累计入渗量和入渗速率与入渗时间均呈显著或较显著的幂函数关系;Green-Ampt入渗模型能准确的描述局部控制地下浸润灌溉中累计入渗量与入渗时间不同的关系,Green-Ampt模型对地下有压点源土壤入渗特性的模拟精度比Philip模型的高。
[Abstract]:Facility agriculture in China has developed rapidly, providing consumers with rich and varied varieties of off-season vegetables and fruits. However, most of them use traditional irrigation methods and use a large amount of water for irrigation. Adopting the advanced water-saving irrigation technology can not only improve the utilization rate of water, increase the benefit of planting, but also improve the water environment of greenhouse crops, and improve the quality and yield of the products. Local controlled underground infiltration irrigation is a kind of irrigation method with high water-saving potential, which is put forward on the basis of referring to the existing technology. It is a kind of irrigation method with underground water infiltration, and the bottom of the planting trough is partially perforated and placed in a flume at a certain depth. The technique of soakage irrigation by capillary action of soil. It is of great significance to study the law and simulation of soil moisture movement under the condition of this technology for its ripening and application. In this paper, the measurement of soil moisture movement parameters of different bulk density in greenhouse soil, the experiment of underground point source infiltration and underground comprehensive infiltration were carried out, and the characteristic curves and diffusivity of different bulk density soil to soil moisture were analyzed systematically. The influence of infiltration parameters such as infiltration rate, cumulative infiltration amount and wetting front migration on infiltration rate of underground point source is analyzed. Green-Ampt and Philip models are used to fit the measured data. The results show that Green-Ampt infiltration model can accurately describe the cumulative infiltration amount and infiltration time in local controlled underground irrigation. The simulation accuracy of Green-Ampt model is higher than that of Philip model.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：S275;S152.72

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