The Evaporation of Different Soil Surface in Situ Experiment

• Main Authors: Wei-Qing Luo, 羅維清
• Other Authors: Te-Hsing Chang
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/68171778145458233521

碩士 === 中原大學 === 土木工程研究所 === 100 === Abstract In the process of the hydrological circulation, Evapotranspiration plays a very important role. Specifically in hydraulic engineering, it is important items in water balance computation. In Taiwan Affected by the geography and climate, rainfall is uneven distribution of time and space,and terrain changes and fluctuations is very giant、river is short and rapid,because rainfall intercepts and stores is not easy to use, so rain flows into the sea directly, Available water resource is more limited in Taiwan. There is many influence factors in soiltranspiration rate, includes meteorological variables, the moisture amount and type of soil will also directly affect soil evaporation.Therefore, in this paper, four kinds of soil evaporation process will be researched and analysised, The outcome of the study will contribute to the model setting up of different soil moisture and evaporation. The experiment was performed at the Chung Yuan Christian University, using weighing method for measured soil evaporation and the free water surface evaporation every day ,according to the between the change of the water content of the soil and the ratio of soil to water,using OriginPro 8.5 draw the diagram of dimensionless of water content and evaporation rate, will know the soil full of evaporation results. The result shows, the interrelationship between the change of the water content of the soil and the ratio of soil to water, after the regression analysis by OriginPro 8.5, the R-square values are all greater than 0.8. In addition to Compare the experimental measurements of free surface evaporation and the weather station of Pan Data, Spring correction factor of 0.54, Summer correction factor of 0.67, average the value of 0.605.There is a great help for Hydro-meteorological model established and very valuable reference. Finally, the model and experimental results are broadly in line with, therefore, verify the mode can use to calculate the soil evaporation.