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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50199

Title: The Study of Dynamic Effect on the Soil Water Retention Curve During the Drainage
Authors: Yen-Hsiang Tseng
Yung-Chia Chiu
Contributors: 國立臺灣海洋大學:應用地球科學研究所
Keywords: Unsaturated zone
Soil water retention curve
Capillary pressure
Water content
Dynamic coefficient
Date: 2017-03
Issue Date: 2018-09-20T03:40:12Z
Publisher: Journal of Taiwan Agricultural Engineering
Abstract: Abstract: Unsaturated zone is a very complicated multi-phase system. In order to understand the hydrological characteristics in the unsaturated zone, the primary object is to obtain the hydraulic conductivity. Previous studies showed that the hydraulic conductivity could be estimated based on the soil water retention curve. Traditionally, the soil water retention curve is obtained under static condition; however, the static condition does not apply to the field and the dynamic effects should be considered. In this study, a series of laboratory experiments were performed to measure soil water retention curves during the drainage and to assess the significance of dynamic effects on the curves. The experimental results show that the water retention curves can be significantly differentiated under different flow and boundary conditions. At a given water content, the dynamic capillary pressure is higher than the static capillary pressure during the drainage and the difference increases with the increase of flux or head difference. Dynamic coefficient decreases as the increase of saturation, and depends on the grain size of porous media. Although the mechanisms of dynamic effects are unclear, their effects on the water retention curve cannot be ignored and should be considered when quantifying the hydraulic conductivities.
Relation: 63(1) pp.50-58
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50199
Appears in Collections:[應用地球科學研究所] 期刊論文

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