Part 9

1. 1
Advanced Soil and Water
Engineering #9
Masahiro Tasumi
Dept. Forest & Env. Sci.
Class schedule
No. Date Contents
1 4/11 Course outline for Advanced Soil and Water Engineering
2 4/18 Physical characteristics of soil I
3 4/25 Physical characteristics of soil II (NO CLASS)
4 5/9 Physical characteristics of soil III
5 5/16 Physical characteristics of soil IV
6 5/23 Micrometeorology I
7 5/30 Micrometeorology II
8 6/6 Micrometeorology III
9 6/13 Micrometeorology IV
10 6/20 Soil water and Evapotranspiration I
11 6/27 Soil water and Evapotranspiration II
12 7/4 Soil water and Evapotranspiration III
13 7/11 Soil and water engineering in operation I
14 7/18 Soil and water engineering in operation II
15 7/25 Discussions
Today’s Topic
Clear-sky Solar Radiation
-Micrometeorology VI
-as preparation for ET calc.
Comparison between calculated results and the measurements
May 18, 2017 (A clear-sky day) May 29, 2017 (A clear-sky day)
May 29 might be hazy/dusty. (The met. station reports noontime visibility is
50km at May 18 and 30km at May 29, indicating May 29 is slightly hazy/dusty)
The estimated clear-sky solar radiation agreed well in Miyazaki in spring.
However, do not blindly assume the estimation is perfect in all location and season.
The set of estimated equations includes theoretical (i.e. universal) part and
empirical part (i.e. based on assumptions of conditions). Thinking the assumptions
and applicability of equations are one of the important ability of M.S. holder.
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SolarRadiation（W/m2）
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SolarRadiation（W/m2）
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2. 2
Weather Data – Japan. Meteorol. Agency
Western U.S. Agricultural
Weather Stations
Weather Data – NOAA / WMO
Air Pressure at Land and Ocean Surfaces
Precipitation
Air Temperature
Dew Point Temperature, Vapor Pressure, Relative Humidity
Wind Speed and Direction
Sunshine Hours, Solar Radiation
Snowfall, Snow depth
General weather abstract, Cloudiness
Visibility
Miyazaki Meteorological Station Provides…
for Hourly, Daily, Monthly,
Seasonal and Annual time scale.
Miyazaki Meteorological Station Provides…
(Example data in June 13, 2014)

3. 3
Lecture Materials
Solar declination angle (太陽赤緯)
Lecture Materials
Solar declination angle (太陽赤緯)
Lecture Materials
Hour angle (時角)