| Summary: | 碩士 === 中原大學 === 土木工程研究所 === 94 === In the process of the land water circulation, rainfall and evaporation are both playing a quite important role. In a word, evaporation is the function of the water changing form the liquid to the gas and finally entering into the atmosphere. The evaporation function of the earth’s surface usually takes place while there is no rainfall, at this moment, the number of the water content of the soil and soil temperature will cause the change of the evaporating speed, and each meteorological factor and land hydrology factors will also influence each other, so it is extremely complicated in studying. Therefore, this text aims at the evaporation situations of the laterite of the district of Taoyuan and the sand of the Dajia River and studies these situations further. The outcome of the study will contribute to the model setting up of the water content of the non-saturated layer of the soil in the future.
This study will be according to the between the change of the water content of the soil and the ratio of soil to water, and shape a straight line. Then, we can find the process of the soil evaporation can divide into three stages: (1) steadily evaporation, (2) the evaporating rate drops apparently, (3) the evaporating rate becomes faint; and we can get the formula of the soil evaporation in each stage depending on the experimental result.
The experimental result shows that the interrelationship between the change of the water content of the soil and the ratio of soil to water will present a segmenting type of linear relationship depending on specific soil moisture constant. And, after the regression analysis, the R-square values are all greater than 0.7 besides the stage of the evaporating rate becoming faint. The result of this study could contribute to the setting-up of the model of the whole hydrology circulation, and it could also has much reference value.
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