| Title Alternative | Mitigation Effect of Thermal Environment on the Asphalt by Sprayed Water |
|---|---|
| FullText URL | fest_026_007_010.pdf |
| Author | MOROIZUMI, Toshitsugu| ITO, Naoya| MIURA, Takeshi| |
| Abstract | In this study, water was sprinkled on the asphalt surface during the hottest hours of the day using a sprinkler, and the effect was experimentally verified. An air temperature, a humidity, a ground surface temperature, and a globe temperature which is radiant heat from the ground were measured, and using these measurements, WBGT (Wet-Bulb Globe Temperature), which is an index of thermal stress on the human body, was calculated. In this way, we investigated not only the climate mitigation effect but also the mitigation effect of the thermal environment felt by the human body. As a result, the following points were clarified in this study: 1) During sprinkling, the air temperature, the black globe temperature, and the WBGT were lower in the sprinkled area than in the controlled area, and the wet-bulb temperature hardly changed. 2) Focusing on the amount of change after watering compared to before watering, the air temperature, the globe temperature, and the WBGT decreased, and the wet-bulb temperature hardly changed. 3) In the sprinkled area, when the WBGT value just before watering is higher than that of the strict caution (WBGT is 28°C or higher), it drops to a level one rank lower, and when the WBGT value just before watering is warning (WBGT value is 25°C or higher), it was almost no change. |
| Keywords | WBGT Air temperature Globe Temperature Thermal environment Sprayed water |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2021-03 |
| Volume | volume26 |
| Issue | issue1 |
| Start Page | 7 |
| End Page | 10 |
| ISSN | 13419099 |
| language | Japanese |
| File Version | publisher |
| Title Alternative | Estimation of actual evapotranspiration in 3 river basins in Okayama prefecture - Comparison of Morton method and modified Brutsaert & Stricker method - |
|---|---|
| FullText URL | fest_026_001_005.pdf |
| Author | MOROIZUMI, Toshitsugu| MIURA, Takeshi| |
| Abstract | In the study, the actual evaporation was estimated in the Asahi River, the Takahashi River, and the Yoshii River basins in Okayama prefecture for four years from January 1999 to December 2002. The Morton method and the modified Brutsaert and Stricker (B & S) method were applied to the three river basins to estimate the actual evapotranspiration and compare the two methods. As a result, the actual evapotranspiration by the Morton method was all almost equal to that by the Penman’s potential evapotranspiration, and the evapotranspiration was overestimated rather than the actual evapotranspiration. The actual evapotranspiration by the modified B & S method was below the Penman’s potential evapotranspiration throughout the year, and the total annual amount was about 80% of the potential evapotranspiration. In addition, the modified B & S method showed the general tendency that the actual evapotranspiration was lower in urban area than in the hilly and mountainous areas. |
| Keywords | Complementary relationship Actual evapotranspiration Potential evapotranspiration |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2021-03 |
| Volume | volume26 |
| Issue | issue1 |
| Start Page | 1 |
| End Page | 5 |
| ISSN | 13419099 |
| language | Japanese |
| File Version | publisher |
| 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 | Japanese |
| File Version | publisher |
| NAID | 120005997444 |
| 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 | Japanese |
| File Version | publisher |
| NAID | 120005997443 |
| 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 | Japanese |
| File Version | publisher |
| NAID | 120005572534 |
| 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 | Japanese |
| File Version | publisher |
| NAID | 120002949472 |
| Author | Moroizumi, Toshitsugu| Kusuyama, Tomoyo| Miura, Takeshi| |
|---|---|
| Published Date | 2009-12 |
| Publication Title | 環境制御 |
| Volume | volume31 |
| Content Type | Departmental Bulletin Paper |
| Author | Takahashi, Sin-Ei| Miura, Takeshi| Hatori, Osamu| |
|---|---|
| Published Date | 2004-01 |
| Publication Title | Mathematical Journal of Okayama University |
| Volume | volume46 |
| Issue | issue1 |
| Content Type | Journal Article |
| JaLCDOI | 10.18926/mjou/33926 |
| Author | Miura, Takeshi| |
|---|---|
| Published Date | 2002-01 |
| Publication Title | Mathematical Journal of Okayama University |
| Volume | volume44 |
| Issue | issue1 |
| Content Type | Journal Article |
| JaLCDOI | 10.18926/mjou/33119 |
| Author | Moroizumi, Toshitsugu| Sasaki, Yumi| Miura, Takeshi| |
|---|---|
| Published Date | 2008-12 |
| Publication Title | 環境制御 |
| Volume | volume30 |
| Content Type | Journal Article |
| Author | 吉崎 文人| 黒田 訓宏| Miura, Takeshi| Moroizumi, Toshitsugu| |
|---|---|
| Published Date | 2004-07-01 |
| Publication Title | 岡山大学農学部センター報告 |
| Volume | volume26 |
| Content Type | Departmental Bulletin Paper |
| Author | 猪原 幸子| Iwata, Tooru| Miura, Takeshi| |
|---|---|
| Published Date | 2004-07-01 |
| Publication Title | 岡山大学農学部センター報告 |
| Volume | volume26 |
| Content Type | Departmental Bulletin Paper |
| Author | 牛川 希望| Iwata, Tooru| Miura, Takeshi| |
|---|---|
| Published Date | 2004-07-01 |
| Publication Title | 岡山大学農学部センター報告 |
| Volume | volume26 |
| Content Type | Departmental Bulletin Paper |
| JaLCDOI | 10.18926/fest/11635 |
|---|---|
| FullText URL | 001_169_179.pdf |
| Author | Abenney-Mickson Stephen| Miura, Takeshi| |
| Abstract | The SWAP93 model was used to predict how much capillary rise would occur in cropped fields. The experimental fields were located in a humid climate and it was thought that contribution from groundwater sources to total water use could be significant. In one field planted with soybean, the model predicted an average daily uptake of 1.3 mm; in another field planted with pumpkin, there was average daily uptake of 0.3 mm; and yet in a third field located in a vinyl house there was average daily uptake of 0.03 mm. These predictions represent about 38,7 and 1% contribution to total water use respectively. Even though there were no measured data to compare with, the results lie within the range of other works reported in the literature. |
| Keywords | Crop water use capillary rise SWAP93 model groundwater |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1996-03 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 169 |
| End Page | 179 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313364 |
| JaLCDOI | 10.18926/fest/11628 |
|---|---|
| Title Alternative | Secular changes of air temperature and precipitation in Okayama City. |
| FullText URL | 001_163_168.pdf |
| Author | Miura, Takeshi| |
| Abstract | In this paper, secular changes of air temperature and the amount of precipitation in Okayama city are discussed using observed values at Okayama meteorologiccal station. Special reference is made to 1993 and 1994 in which peculiar changes occurred. The results obtained are summarized as follows: (1) The increasing rate of the annual mean air temperature at Okayama city is 0.85℃/100y. This value is nearly equal to the average of Japan; 0.87℃/100y. (2) The increasing rate indicates seasonal changes, and the rate is high especially in April and May. (3) The rapid increase of the air temperature in the 1980s is due to removal of Okayama meteorological station from the edge of town to the center. (4) The annual mean air temperature in 1994 is 16.9℃, and the monthly mean temperature for July and August are 29.8 and 29.6℃ respectively. These values are new records at the Okayama station. (5) The air temperature in July and August, 1993 are higher than in 1980 when it was much colder in the summer. (6) The amount of precipitation does not show any secular changes. |
| Keywords | the air temperature secular changes Okayama city |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1996-03 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 163 |
| End Page | 168 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313505 |
| JaLCDOI | 10.18926/fest/11572 |
|---|---|
| Title Alternative | Comparison of micrometeorological environments inside and outside a watermelon plastic greenhouse |
| FullText URL | 003_121_126.pdf |
| Author | Morita, Noboru| Miura, Takeshi| |
| Abstract | The use of glass and plastic greenhouses have rapidly increased in recent years. Meteorological and soil moisture environments inside a greenhouse are significantly different from those in the open field. These differences should be understandable to establish accurate predictions of water consumption and evapotranspiraton inside a greenhouse which play impotrant roles in the design of any irrigation system. This study aims to estimate the micrometeorological conditions inside a watermelon plastic greenhouse which can be used for evapotranspiration calculations. Therefore, micrometeorological data were measured inside and outside the greenhouse for the comparison purposes. The results of this study may be summarized as : (1) Solar radiation inside the greenhouse was about 70% of that of outside it. (2) Net radiation during the daytime inside the greenhouse was almost the same as the absorbed total short-wave radiation. (3) The difference of air temperature inside and outside the greenhouse was very large during the daytime whereas not much difference was observed during the nighttime. (4) Both relative humidity and saturation deficit inside the greenhouse were higher than outside in case of highly vegetative land. (5) Wind speed inside the greenhouse was almost zero, while outside the average value was 1.8m/s. |
| Keywords | plastic greenhouse micrometeorology watermelon |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1998-01-14 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 121 |
| End Page | 126 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313884 |
| JaLCDOI | 10.18926/fest/11537 |
|---|---|
| Title Alternative | Long-term Change Trend of Climate at Aomori City |
| FullText URL | 006_081_084.pdf |
| Author | Moroizumi, Toshitsugu| Sato, Yuichi| Sato, Koichi| Miura, Takeshi| |
| Abstract | Characteristics of long-term change for air temperature, precipitation and snowfall-depth at Aomori city were analyzed with data during the 111 years, from 1886 to 1996. The typical results were as follows: (1) The increasing rate of the annual mean air temperature was 1.07℃/111 year. (2) The increasing rate of the monthly minimum air temperature was larger than that of the monthly maximum air temperature. (3) The increasing rate of the monthly air temperature was large from winter to spring, however, was not so from summer to autumn. (4) The decreasing rate of annual precipitation was 0.187 mm/year. (5) The 5-year moving average of annual snowfall-depth might indicate the existence of about 10-year period. |
| Keywords | Air temperature precipitation snowfall-depth long-term change Aomori city |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2001-02-28 |
| Volume | volume6 |
| Issue | issue1 |
| Start Page | 81 |
| End Page | 84 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313378 |
| JaLCDOI | 10.18926/fest/11536 |
|---|---|
| Title Alternative | Long-term Trend of Rainfall at Tsudaka Farm of Okayama University |
| FullText URL | 007_107_111.pdf |
| Author | Moroizumi, Toshitsugu| Yomota, Atsushi| Miura, Takeshi| |
| Abstract | Characteristics of long-term change in rainfall at Tsudaka Farm of Okayama University were analyzed with data during the 20 years, from 1979 to 1998. The typical results were as follows: (1) The average of annual rainfall was 1203 mm at average, 1726 mm at maximum, and 666 mm at minimum. (2) The decreasing rate of the annual rainfall was 5.37 mm/year. (3) Trend of rainfall intensity in each rainfall duration showed an increase of which rate were 0.005~0.256 mm/h/year, contrary to the annual trend. (4) Rainfall intensities in n-years probability were estimated using the maximum rainfall intensity for each rainfall duration. |
| Keywords | Rainfall Rainfall intensity Rainfall duration Talbot formula Long-term trend Tsudaka Farm of Okayama University |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2002-03-22 |
| Volume | volume7 |
| Issue | issue1 |
| Start Page | 107 |
| End Page | 111 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313813 |
| JaLCDOI | 10.18926/fest/11463 |
|---|---|
| Title Alternative | Heat Budget on Rice Field |
| FullText URL | 009_081_085.pdf |
| Author | Yang, Dongmei| Iwata, Toru| Miura, Takeshi| Ohtaki, Eiji| |
| Abstract | Experience of flux measurements over tall canopies has revealed that the eddy flux of sensible plus latent heat is about 30% smaller than the available radiant energy flux. A systematic observation was carried out to investigate the imbalance problem on rice field. The rice field represents a complex system consisting of rice plant, irrigated water and soil. Date obtained in this experiment show that appreciable understimations of sensible and latent heat fluxes are not recognized but understimations of 15 to 23% are counted in the soil heat flux. |
| Keywords | Heat budget Eddy correlation method Sensible heat flux Latent heat flux Soil heat flux |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2004-02-27 |
| Volume | volume9 |
| Issue | issue1 |
| Start Page | 81 |
| End Page | 85 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313468 |
| JaLCDOI | 10.18926/fest/11462 |
|---|---|
| Title Alternative | Comparison of micrometeorological environments inside and outside an oriental pickling melon greenhouse. |
| FullText URL | 012_125_130.pdf |
| Author | Morimoto, Yuji| Hirano, Emi| Miura, Takeshi| |
| Abstract | The use of greenhouses has rapidly increased after 1965, and the area became 11 times of 1965 as of 2001. Meteorological conditions and soil moisture environments inside a greenhouse are significantly different from those in the open field. These differences should be understandable to establish accurate predictions of water consumption and evapotranspiration inside a greenhouse which play important roles in the design of any irrigation system. This study aims to estimate the micrometeorological conditions inside an oriental pickling melon greenhouse which can be used for evapotranspiration calculations. Therefore, micrometeorological data were measured inside and outside the greenhouse for the comparison purposes. The results of this study may be summarized as: (1) Solar radiation inside the greenhouse was decreased about 30% of that of outside it by plastic film and frame. (2) Net radiation during the daytime inside the greenhouse was almost the same as the absorbed total short-wave radiation. (3) The difference of daytime mean air temperature inside and outside the greenhouse was between 3 and 4 degree Celsius in day average. (4) Both relative humidity and saturation deficit inside the greenhouse were higher than outside, and those were affected by ventilation. (5) Wind speed inside the greenhouse was greatly affected by opening rate of the house side. |
| Keywords | greenhouse micrometeorology oriental pickling melon |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2007-03-15 |
| Volume | volume12 |
| Issue | issue1 |
| Start Page | 125 |
| End Page | 130 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313863 |
