砂土斥水性与含水率关系的试验研究及理想模型分析

发布时间：2018-04-03 04:09

本文选题：土壤斥水性　切入点：含水率　出处：《节水灌溉》2017年08期

【摘要】：为了探究土壤斥水性与含水率的关系,采用滴水渗透时间法进行室内试验,基于理想土壤颗粒模型,通过接触角变化进行理论分析,研究了不同含水率下砂土斥水性质的变化规律。结果表明:砂土斥水性随含水率的增大表现出以1.5%~2%含水率范围为拐点的先增大后减小的单峰曲线变化趋势;砂土自身斥水强度越高,其斥水持续时间的峰值越大,对应的土壤含水率值越小,且表现出斥水性质的下阈值含水率也相对越小;滴水渗透时间法和接触角法对土壤斥水性的判定存在差异,其实质是二者分别从土壤的斥水持久性和斥水强度两个角度对斥水性质进行评价。以上研究结果可为斥水土壤的研究奠定基础。
[Abstract]:In order to explore the relationship between soil water repellency and moisture content, the indoor experiment was carried out with the method of drip permeation time. Based on the ideal soil particle model, the contact angle was analyzed theoretically.The variation of water repellent properties of sand under different moisture content was studied.The results show that with the increase of water content, the repulsion of sand soil shows the trend of single peak curve with the range of 1.5% and 2% water content as the inflection point, and the higher the water repellent intensity of sand is, the greater the peak value of water repellent duration is.The smaller the soil moisture content is, the lower the threshold water content is, and the difference exists between the permeation time method and contact angle method.The essence of this study is to evaluate the repulsion properties of soils from the perspectives of water repellent persistence and water repellent intensity.The results above can lay a foundation for the study of water-repellent soil.
【作者单位】：西北农林科技大学水利与建筑工程学院;西北农林科技大学旱区节水农业研究院;
【基金】：国家自然科学基金资助项目(51409221,51349001) 西北农科技大学基本科研业务费(2452017116)
【分类号】：S152.7

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