Estimating soil surface evaporation from fields irrigated by micro systems

估算微系统灌溉田地的土壤表面蒸发量

• 批准号: 02660242
• 负责人: NAKANO Yoshisuke
• 金额: $ 1.22万
• 依托单位: Faculty of Agriculture, Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02660242/
• 关键词: Micro irrigation; Irradiation; Water consumption; Heat balance; Row crop; Wetted surface; Water potential; Soil surface evaporation

To evaluate the consumptive use efficiency of irrigated water. it is interest to estimate the soil surface evaporation component separately from transpiration component. When the fields are irrigated by microirrigation systems. wetted area are formed on the soil surface. Estimating evaporation rate from the wetted spots are important to quantify the water for irrigation.Two approaches were pursued on this project. Firstly. vapor diffusion mechanism in the binary layer on the soil surface was experimentally examined. Evaporimeter made with thin plaster layer was observed to give good estimation. Secondary. the mechanism of water diffusion in the the vicinity of soil surface was examined. Using an equipment to measure soil water potential, distribution of volumetric soil water contents during the fallen rate stage of drying in the surface layer were observed. Water flow rates determined with this observation were compared with calculated results of summation model. With this technique, water diffusivity in the surface layer were precisely investigated.

评价灌溉水的消耗利用效率。将土壤表面蒸发分量与蒸腾分量分开估计是很有意义的。当田地由微灌溉系统灌溉时。土壤表面形成湿润区。估计湿点的蒸发率对于量化灌溉用水非常重要。该项目采用了两种方法。首先。通过实验研究了土壤表面二元层中的蒸汽扩散机制。观察用薄石膏层制成的蒸发计可以给出良好的估计。次要的。研究了土壤表面附近水扩散的机制。利用土壤水势测量设备，观测表层干燥降速阶段土壤体积含水量的分布情况。将通过该观察确定的水流量与求和模型的计算结果进行比较。通过该技术，可以精确研究表面层的水扩散率。

项目成果

Yoshisuke NAKANO and Masaharu KURODA: "Three Dimensional Analysis of Soil Moisture Movement in Row Crop Field for Irrigation" Transactions 14th International Congress of Soil Science. 14, VI. 102-107 (1990)

Yoshisuke NAKANO 和 Masaharu KURODA：“灌溉中耕作物田间土壤湿度运动的三维分析”第 14 届国际土壤科学大会交易。

Yoshisuke NAKANO,Masaharu KURODA: "Three Dimensional Analysis of Soil Moisture Movement in Row Crop Field for Irrigation" Transactions 14th International Congress of Soil Science. 14ーIII. 102-107 (1991)

Yoshisuke NAKANO、Masaharu KURODA：“灌溉作物田间土壤水分运动的三维分析”第 14 届国际土壤科学大会 14-III（1991 年）。

Yoshisuke NAKANO,Masaharu HURODA: "Three Dimensional Analysis of Soil Moisture Movement in Row Crop Field for Irrigation" Transactions 14th International Congress of Soil Science. 14-VI. 102-107 (1990)

Yoshisuke NAKANO、Masaharu HURODA：“灌溉中耕作物田间土壤水分运动的三维分析”第 14 届国际土壤科学大会交易。

Yoshisuke NAKANO,Masaharu KURODA: "IRRIGATION and DRAINAGE" American Sciety of Civil Engineerings, 821 (1991)

Yoshisuke NAKANO、Masaharu KURODA：“灌溉和排水”美国土木工程学会，821 (1991)

Yoshisuke NAKANO, Masaharu KURODA: "IRRIGATION and DRAINAGE" American Sciety of Civil Engineerings, 821 (1991)

Yoshisuke NAKANO、Masaharu KURODA：“灌溉和排水”美国土木工程学会，821 (1991)