| Summary: | 碩士 === 國立臺灣大學 === 生物環境系統工程學系暨研究所 === 91 === In order to solve the transport of water in the unsaturated soil, the hydraulic property must be available, that property is dependent on the moistures and nature of soils. In unsaturated soils, hysteresis is an important phenomenon affecting water flow, and the effect should be taking into account during wetting and drying processes. Taiwan is surrounded with seawater , and it''s very serious that seawater infiltrates into soil. The salinization of soil not only affects the usage of area along the coast, but also influences the restoration of soil and development of agriculture. Because after the salinity and water infiltrates into soil, the progress of infiltrating, evaporating, and movement become very complex. In addition, hysteresis also has a great influence. Therefore, it becomes more important for unsaturated flow and the research of salinity transport. Hysteresis has important effects in the field and cannot be neglected. Most studies are ignored about hysteresis because of complication. The prediction of soil water balance can be improved by taking hysteresis into account under diurnally varying environmental condition that involved alternative wetting and drying.
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