斥水土壤水分特征曲线及拟合模型分析

发布时间：2018-05-17 13:26

本文选题：斥水 + 土壤　；参考：《中国农村水利水电》2017年07期

【摘要】：为了研究斥水土壤的持水能力,选用以色列3类土质、2个斥水程度的6种斥水土壤,采用离心机法测定其土壤水分特征曲线,应用RETC软件中的VG、BC、DP和LND模型进行拟合,并对拟合效果进行评价。结果表明:斥水土壤的土壤水分特征曲线与亲水土壤的变化规律基本一致,同一种类型的土壤,在同一吸力条件下,土壤斥水程度等级越高,含水率越小,保水能力越低。从模拟效果来看,对于斥水黏土和壤土,VG、BC和DP模型的拟合值和实测值均呈极显著相关关系,而LND模型不适用;对于砂土,VG、BC、LND和DP模型拟合值和实测值均为极显著相关关系。因此对于斥水砂土推荐使用LND和DP模型;对于黏土和壤土,VG、BC和DP模型拟合效果差异不大,均可使用。
[Abstract]:In order to study the water-holding capacity of water-repellent soil, the soil moisture characteristic curves were measured by centrifuge method and fitted by VGG BCCDP and LND models in RETC software, and 6 kinds of water-repellent soils with 3 types of soil quality and 2 types of water repellent degree in Israel were selected. The fitting effect was evaluated. The results showed that the characteristic curve of soil moisture was basically consistent with that of hydrophilic soil. Under the same suction condition, the higher the degree of repulsion, the smaller the moisture content and the lower the water retention capacity of the same type of soil. From the result of simulation, the fitting value and the measured value of VGN BC and DP model were significantly correlated, but the LND model was not applicable, and the fitting value and the measured value of VGCU LND model and DP model were extremely significant correlation for sand soil. Therefore, LND and DP models are recommended for water-repellent sandy soils, while for clay and loam, there is no significant difference between the two models.
【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农业水土工程教育部重点实验室;本古里安大学Blaustein沙漠研究所;
【基金】：国家自然科学基金资助项目(51409221、51349001) 中央高校基本科研业务费(2452016069)
【分类号】：S152.7

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