温度对砂型土壤和石英砂水分特征曲线的影响

发布时间：2018-01-04 13:21

本文关键词：温度对砂型土壤和石英砂水分特征曲线的影响　出处：《水土保持研究》2016年06期 　论文类型：期刊论文

【摘要】：为了研究温度变化对土壤和石英砂持水特性差异的影响机理,在离心机试验的基础上结合理论分析,对不同温度下土壤和石英砂水分特征曲线实测数据、低吸力段比水容及Van Genuchten经验模型的拟合参数进行了研究分析。结果表明:温度的变化对土壤水分特征曲线的位置影响显著,对曲线的走势无太大影响;而对于石英砂样本受温度变化的影响并不明显;温度对土壤持水能力的影响很大部分是由土壤中水分的性质和土壤自身性质共同决定的;同时,结合比水容的概念和水分特征曲线的VG模型参数较准确地评价温度变化下两种供试样品的持水性能和水分的有效程度。
[Abstract]:In order to study the influence mechanism of temperature change on soil and quartz sand water holding characteristics, based on the centrifuge test and theoretical analysis, the measured data of soil and quartz sand moisture characteristic curve at different temperatures were measured. The specific water capacity of low suction section and the fitting parameters of Van Genuchten empirical model were studied and analyzed. The results showed that the change of temperature had a significant effect on the position of soil water characteristic curve. It has no great influence on the trend of curve. The effect of temperature on quartz sand samples is not obvious. The effect of temperature on soil water holding capacity is largely determined by the properties of soil moisture and soil itself. At the same time, the VG model parameters based on the concept of specific water capacity and the water characteristic curve are used to evaluate the water holding capacity and the water availability of the two samples under the temperature change.
【作者单位】：三峡大学水利与环境学院;水资源安全保障湖北省协同创新中心;
【基金】：国家自然科学基金项目(51409152) 湖北省自然科学基金项目(2012FFB03802)
【分类号】：S152
【正文快照】： 非饱和土壤水分特征曲线[1](SWCC)是土壤水管理和研究的最基本资料,是描述非饱和土壤中土壤水分含量或饱和度与土壤基质势之间的关系曲线,同时它也是研究土壤水分运动和溶质运移等问题的基础,反映土壤水分能态和持水特征,对研究土壤水分运移及植物生长等方面有重要意义。土壤

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