基于分形的全范围土壤水分特征曲线模型

Q1 Physics and Astronomy

Capillarity Pub Date : 2019-12-25 DOI:10.26804/capi.2019.04.02

Tingxu Jin, Xin Cai, Yin Chen, Shanshan Jiang, Wei Wei

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引用次数: 6

摘要

土壤水分特征曲线(SWCC)在水利工程、土木工程和石油工程等领域有着重要的应用。大多数SWCC模型忽略了干态下的膜流，无法准确描述整个含水率范围内的SWCC。本文将Campbell和Shiozawa模型与Tao模型相结合，提出了一种可替代的分形模型来预测整个含水率范围内的SWCC。该模型能较好地预测12组试验数据，分形维数、饱和体积含水量、烘干条件下基质吸力、进风值等参数与理论值基本一致。结果表明:对于不同分形孔径分布的土壤，在对数-对数尺度上，体积含水量与基质吸力之间存在较强的线性关系;此外，在所有情况下，实验数据与模型预测结果吻合较好。引用本文:金，谭，蔡晓，陈，杨，蒋，生，魏伟。全范围含水量土壤水分特征曲线的分形模型。毛细管学，2019,2(4):66-75,doi: 10.26804/capi.2019.04.02。

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A fractal-based model for soil water characteristic curve over entire range of water content

Soil water characteristic curve (SWCC) has been an important role in hydraulic engineering, civil engineer and petroleum engineering, etc. Most of SWCC models neglected the film flow in the dry state, so that they cannot accurately describe the SWCC over entire range of water content. In this work, an alternative fractal model is proposed to predict the SWCC over entire range of water content by combining Campbell and Shiozawa model and Tao model. The proposed model can well predict twelve sets of experimental data, and its parameters, including the fractal dimension, the saturated volumetric water content, the matric suction at oven-dry condition, and the air-entry value, accord with theoretical value. The results show that there is a strong linear relationship between volumetric water content and matrix suction in log-log scale for different fractal pore-size distribution of soils. In addition, good agreement is obtained between the experimental data and the model predictions in all of the cases. Cited as : Jin, T., Cai, X., Chen, Y., Jiang, S., Wei, W. A fractal-based model for soil water characteristic curve over entire range of water content. Capillarity, 2019, 2(4): 66-75, doi: 10.26804/capi.2019.04.02.

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来源期刊

Capillarity Physics and Astronomy-Surfaces and Interfaces

CiteScore

7.10

自引率

0.00%

发文量

审稿时长

2~3 weeks

期刊介绍： Capillarity publishes high-quality original research articles and current reviews on fundamental scientific principles and innovations of capillarity in physics, chemistry, biology, environmental science and related emerging fields. All advances in theoretical, numerical and experimental approaches to capillarity in capillary tube and interface dominated structure and system area are welcome. The following topics are within (but not limited to) the scope of capillarity: i) Capillary-driven phenomenon in natural/artificial tubes, porous and nanoporous materials ii) Fundamental mechanisms of capillarity aided by theory and experiments iii) Spontaneous imbibition, adsorption, wicking and related applications of capillarity in hydrocarbon production, chemical process and biological sciences iv) Static and dynamic interfacial processes, surfactants, wettability, film and colloids v) New approaches and technologies on capillarity Capillarity is a quarterly open access journal and free to read for all. The journal provides a communicate platform for researchers who are interested in all fields of capillary phenomenon.