JaLCDOI 10.18926/fest/44792
Title Alternative Improvement of complementary relationship-based evapotranspiration model
FullText URL fest_016_035_039.pdf
Author Nakamichi, Takeshi| Moroizumi, Toshitsugu| Miura, Takeshi|
Abstract Advection-Aridity(AA) model can calculate actual evapotranspiration by using only meteorological data. However, comparing the model with Penman equation showed that AA model doesn’t properly evaluate evapotranspiration from urban moisture area. In urban area, Actual evaporation from water calculated by AA model(E) are much less than that by Penman equation(Epo). Multiple regression analysis using estimation results indicates that the difference between the models is due to the difference of the sensitivity to vapor pressure deficit between the models. To improve this problem, modification coefficient k, defined as k=a・albedo+b, is suggested. Regression coefficients a, b are determined as satisfying k=Epo/E for water and k=1 for urban surface. By using this coefficient k, evaporation from water is nearly equal to value estimated by Penman equation, while evaporation from urban surface is changeless.
Keywords Complementary relationship Actual evapotranspiration Potential evapotranspiration Water budget
Publication Title 岡山大学環境理工学部研究報告
Published Date 2011-03-18
Volume volume16
Issue issue1
Start Page 35
End Page 39
ISSN 2185-3347
language 日本語
File Version publisher
NAID 120002949472
JaLCDOI 10.18926/fest/53219
Title Alternative Building of minimum air temperature forecast system using the Internet -Design of the forecast website-
FullText URL fest_020_035_040.pdf
Author Mishima, Takuya| Miura, Takeshi| Moroizumi, Toshitsugu|
Abstract  The purpose of this study is to build a forecast system for predicting at minimum air temperature in the next morning from the meteorological data, such as air temperature, humidity, and the amount of solar radiation, in a field in the evening on the previous day. The meteorological data are sent to a relay server, and then, transferred to a PC in our laboratory of Okayama University by executing the computer program to import the data which are used to calculate the predicted values of minimum air temperature. The predicted minimum air temperatures are released for the farmers on the website in the server of Okayama University. The website is also created by our laboratory. As a result, the predicted minimum air temperatures agreed with the measured ones.
Keywords Minimum air temperature prediction internet frozen disaster
Publication Title 岡山大学環境理工学部研究報告
Published Date 2015-03
Volume volume20
Issue issue1
Start Page 35
End Page 40
ISSN 2187-6940
language 日本語
File Version publisher
NAID 120005572534
JaLCDOI 10.18926/fest/54862
Title Alternative Method for predicting minimum air temperature in the next morning using local meteorological observation data - Improvement on minimum air temperature forecasting system utilizing the Internet -
FullText URL fest_022_055_059.pdf
Author Ueda, Yu| Mishima, Takuya| Miura, Takeshi| Moroizumi, Toshitsugu|
Abstract We have developed a minimum air temperature forecasting system using local meteorological observation data in order to prevent or mitigate the frost damage. In this paper, the correlation between the meteorological factors and the decrease in air temperature during the night was shown. Then minimum air temperature was predicted by the multiple regression equation that uses air temperature and humidity at 18:00 as explanatory variables. As the result, the root mean square error (RMSE) was 2.8°C. When the difference of air temperature between 17:00 and 18:00 was used for the prediction instead of humidity, the RMSE was 3.5°C. Next, the prediction was carried out only in clear nights, then the equation that use air temperature and humidity at 18:00 showed that the RMSE was 1.3°C. Although the predictive accuracy of the equations for clear nights is low on cloudy or rainy nights, we can forecast safely on frosty nights by using those equations in combination with the equations for all nights.
Keywords Minimum air temperature prediction frost damage IT multiple regression analysis
Publication Title 岡山大学環境理工学部研究報告
Published Date 2017-03
Volume volume22
Issue issue1
Start Page 55
End Page 59
ISSN 2187-6940
language 日本語
File Version publisher
NAID 120005997443
JaLCDOI 10.18926/fest/54863
Title Alternative Evaluation of drop in official air temperature record at Okayama caused by relocation of observation field of Okayama Local Meteorological Observatory - By comparison with records observed at surrounding points -
FullText URL fest_022_061_064.pdf
Author Miura, Takeshi| Ueda, Yu| Morita, Hidenori| Chikamori, Hidetaka| Kurokawa, Masahiro| Nakashima, Yoshitaka| Oki, Yoko|
Abstract Statistical change in official temperature records at Okayama City caused by relocation of meteorological observation field of Meteorological Agency was evaluated. The observation field of Okayama local meteorological observatory was moved to the Tsushima Campus of Okayama University from the downtown area of Okayama City in March, 2015. Comparison between the air temperature records measured at meteorological agency station and the records at Tanjo Pond in Tsushima Campus, showed 0.56 ℃ drop in annual average before and after relocation. Moreover, comparison between the records of Okayama local meteorological observatory and that at the surrounding meteorological observing 9 stations showed 0.55 ℃ drop in annual average. Those results suggest that the relocation dropped annual average of air temperature by about 0.6 ℃.
Keywords Okayama Local Meteorological Observatory relocation drop in air temperature
Publication Title 岡山大学環境理工学部研究報告
Published Date 2017-03
Volume volume22
Issue issue1
Start Page 61
End Page 64
ISSN 2187-6940
language 日本語
File Version publisher
NAID 120005997444