ESTIMATING SOME HYDRAULIC CHARACTERISTICS OF SOIL USING FRACTAL DIMENSION OF SOLID PARTICLES

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EMAMI H.

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Journal: Journal of Soil Management and Sustainable Production Year:2016 | Volume:6 | Issue:1 Page(s): 219-232

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Title

ESTIMATING SOME HYDRAULIC CHARACTERISTICS OF SOIL USING FRACTAL DIMENSION OF SOLID PARTICLES

Author(s)

EMAMI H. | Issue Writer Certificate

Keywords

FRACTALQ2

SOIL MOISTUREQ1

SOIL TEXTUREQ1

Abstract

Background and Objectives: SOIL MOISTURE retention curve is the most important hydraulic function for modeling water flow and solute transport in porous media. Although the hydraulic properties are measured through the direct methods, they are time consuming, difficult and expensive. In last decades, considerable attention has been focused on the development of relationships between the soil water content and the matric potential using FRACTAL geometry models. FRACTAL models based on mathematical and physical concepts described the geometry of solid porous media. Applications of FRACTAL geometry has provided a useful tool to bridge the gap between the use of empirical models and physical interpretation of their parameters. Based on the FRACTAL scaling of soil structure, different SOIL MOISTURE retention curve models have been developed. There are also models based on the FRACTAL scaling of particle size distribution or the pore phase of soils. To apply the models, one needs to determine the FRACTAL dimensions. This research was performed to estimate soil hydraulic characteristics using FRACTAL dimension of solid particles in 40 soil samples.Materials and Methods: 40 soil samples with various physical and chemical properties were collected from 40 km of southern Mashhad (Iran) to estimate soil hydraulic characteristics using FRACTAL dimension of solid particles. SOIL TEXTURE, bulk density and SOIL MOISTURE at 9 pressure heads 0, 10, 30, 50, 100, 300, 500, 1000 and 1500 kPa were measured and used for determining the parameters of Van Genuchten equation (m and α) in RETC software. Also FRACTAL dimension of solid particles was determined based on clay percentage and used for estimating the moisture contents in Brooks and Corey and Van Genuchten equations.Results: The results showed that correlation coefficient (r) values between measured and estimated SOIL MOISTURE contents were slightly high (>0.86) in all SOIL TEXTURE classes, i.e. silty clay, loam and sandy loam and the precision of models in estimating SOIL MOISTURE contents for silty loam class was higher than other classes. Also, using of FRACTAL dimension for estimating the α parameter of Van Genuchten equation had the high precision (r>0.99 and RMSE<0.02) in all 3 SOIL TEXTUREs. The precision of estimated m parametre in Van Genuchten equation by using of FRACTAL dimension in sandy loam class was low (r=0.49; RMSE=0.066), but in loam (r=0.49; RMSE=0.06) and specially in silty clay (r=0.88; RMSE=0065) SOIL TEXTURE class was high.Conclusion: In general, the results of this research showed that using FRACTAL dimension for estimation of the hydraulic characteristics has a high precision in moderate classes and as well as fine soil texturse is high and its efficiency is low in coarse textures.

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APA: Copy

EMAMI, H.. (2016). ESTIMATING SOME HYDRAULIC CHARACTERISTICS OF SOIL USING FRACTAL DIMENSION OF SOLID PARTICLES. ELECTRONIC JOURNAL OF SOIL MANAGEMENT AND SUSTAINABLE PRODUCTION, 6(1), 219-232. SID. https://sid.ir/paper/209872/en

Vancouver: Copy

EMAMI H.. ESTIMATING SOME HYDRAULIC CHARACTERISTICS OF SOIL USING FRACTAL DIMENSION OF SOLID PARTICLES. ELECTRONIC JOURNAL OF SOIL MANAGEMENT AND SUSTAINABLE PRODUCTION[Internet]. 2016;6(1):219-232. Available from: https://sid.ir/paper/209872/en

IEEE: Copy

H. EMAMI, “ESTIMATING SOME HYDRAULIC CHARACTERISTICS OF SOIL USING FRACTAL DIMENSION OF SOLID PARTICLES,” ELECTRONIC JOURNAL OF SOIL MANAGEMENT AND SUSTAINABLE PRODUCTION, vol. 6, no. 1, pp. 219–232, 2016, [Online]. Available: https://sid.ir/paper/209872/en

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