| Summary: | 碩士 === 國立中興大學 === 土木工程學系所 === 106 === It is very important to master the change of soil water budget in the formulation of upland irrigation plan. In dry areas with very low annual rainfall, the supply and the pinch of irrigation water is always disputed, if the change of soil moisture content can be accurately analyzed and used as the basis of irrigation water, not only the water requirement of the crop can be provided properly, but also can avoid irrigation surplus and cause waste of water resources.
In this study, the soil moisture content was estimated by using the soil water movement analysis with Arimori Masahiro(2009), and based on the relevant data of the Soil moisture movement analysis of the irrigation and drainage laboratory of the Agricultural College of Kyoto University, Japan, The paper analyzes the long time variation of soil moisture content in upland test land from April 11, 2015 to July 31 in the East sowing area of Japan,the measured value of the soil moisture content measured by TDR was used as the comparative model in the report.
In this study, we further improved the soil water movement model and added the surface layer to make it more accord with the dry land moisture movement, and compared the two models before and after the soil 0~10cm, 0~20cm, 0~30cm, 0~40cm, 0~60cm for Long-time variation of soil moisture content in different cumulative depth layers of 60cm.
The results show that the change of water content in 0~10cm soil is the largest, and the simulation effect is the best in 0~60cm total soil layer, and the result shows that the simulation effect of the modified model is better than that of the modified model, so it is necessary to discuss the surface layer. In addition, according to the results of the water budget, the crop water requirement can also be used as a reference for crop irrigation water, so it is suitable to estimate the soil moisture content by using the water barrel model as the basis of the irrigation water in upland.
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