The development of evapotranspiration for upland irrigation planning by the AMeDAS meteorolgical data

利用气象资料，采用彭曼法计算了高地灌溉中最重要的参考蒸散量。在日本，大约有840个气象站测量气温、太阳辐射等。这些数据从AMeDAS测量开始以来已经测量了大约20年，并且可以用于Penman方程。本研究的目的是在计算机硬盘上开发一个数据库，以便从数据库中取出必要的数据。用户可以选择目标观测位置、气象因子和观测项，并可以通过Penman方程计算平均值、累积值和参考蒸发量。这些结果输出到数据文件中，并显示为等值线图或等值线图。另一方面，在实际蒸散量的估算中，需要作物系数， 关于我们 使用Penman方程计算的参考蒸散量进行定量。在日本，各种作物的作物系数数据很少，因此，需要测量更多的数据，以详细的高地灌溉规划。三浦博士是一名首席研究员，他使用微气象方法测量了不同高地的蒸散量，并将这些结果重新排列为作物系数。此外，他还建立了辐射平衡的长期测量系统，以测试基于测量值的净辐射预测方程。本文将已发表的文献归纳为四类，即AMeDAS与Penman方程的关系、旱地微气象观测、高地气象观测、和气象环境。今后将发表更多的论文。少

A reference evapotransipiration that is the most important factor in upland field irrigation is calculated by the Penman's method using the meteorological data. There are about 840 weather stations in Japan where air temperature, solar radiation, and so on are measured. Those data have been measured for about 20 years since the start of AMeDAS measurement and can be used for the Penman' equation. The objective of this study was to develop a database on the hard disk in a computer to take out the necessary data from the database. The user can select the target observation location, meteorological factors, and the observation term and can calculate the average values, the cumulative values, and the reference evaporation by Penman's equation. Those results are output into a data file and displayed as a contour map or a plot of equi-values. The system program was coded by a Microsoft Visual Basic language.On the other hand, the crop coefficient is needed to estimate the actual evapotranspi … More ration using a reference evapotranspiration calculated by the Penman's equation. In Japan, there are few data of crop coefficients for various kinds of crops, and therefore it is needed to measure much more data for the detailed upland irrigation planning. Dr. Miura who is a head investigator has measured the evapotranspiration at different upland fields using the micrometeorological method and rearranged those results as crop coefficients. Furthermore, he has set up the long-term measurement system of radiation balance to test the predictive equation of net radiation based on measured values. The differences of sunshine duration due to the different instruments of heliograph have reported, however, the result for the predictive equation of net radiation has not reported.In this report, some papers that have already been published are classified into four categories, that is, the relationship between AMeDAS and Penman's equation, the measurement of micrometeorology in upland field, the upland field irrigation, and the meteorological environment. More papers will be published in the future. Less