考虑薄膜水的利用介质粒度分布获取水土特征曲线的方法

发布时间：2018-03-10 04:36

本文选题：水土特征曲线　切入点：粒度分布　出处：《水科学进展》2017年04期 　论文类型：期刊论文

【摘要】：利用介质粒度分布间接获取水土特征曲线(SWCC)是一种快速、经济的方法。由于该方法的传统模型(HP模型和MV模型)忽略了薄膜水,获得的SWCC在低含水率段存在显著误差。提出了一种考虑介质表面薄膜水的含水率估算方法,与HP模型和MV模型的吸力计算方法结合预测SWCC,选用土壤水力性质数据库UNSODA的17种土壤样品对两种修正模型的预测效果进行了验证。结果表明,采用薄膜水修正后的HP模型和MV模型可以显著改善传统模型中SWCC低含水率段含水率的低估,并能有效地预测砂土等粗粒介质的SWCC。另外,含水率估算中引入参数β后,修正的MV模型也可用于壤土和黏土等细粒介质的SWCC的预测。
[Abstract]:It is a fast and economical method to obtain soil and water characteristic curve indirectly by using particle size distribution of medium. Because the traditional model of this method is HP model and MV model, membrane water is neglected. The obtained SWCC has significant errors in the low moisture content. A method for estimating the moisture content of the film considering the water content on the surface of the medium is proposed. Combined with the suction calculation method of HP model and MV model, 17 soil samples from soil hydraulic property database UNSODA were selected to verify the prediction effect of the two modified models. The HP model and MV model modified by membrane water can significantly improve the underestimation of water content in the low moisture content of SWCC in the traditional model, and can effectively predict the SWCCs of coarse grained media such as sand and soil. In addition, the parameter 尾 is introduced into the water content estimation. The modified MV model can also be used to predict the SWCC of fine grained media such as loam and clay.
【作者单位】：长安大学环境科学与工程学院;长安大学旱区地下水文与生态效应教育部重点实验室;
【基金】：国家自然科学基金资助项目(41472220) 中央高校基本科研业务费专项资金资助项目(310829162015)~~
【分类号】：S152

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