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Solar Radiation Estimation from Rainfall and Temperature Data in Arid and Semi-arid Climates of Iran | ||
| Desert | ||
| مقاله 5، دوره 14، شماره 2، اسفند 2009، صفحه 141-150 اصل مقاله (241.99 K) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22059/jdesert.2009.36334 | ||
| نویسندگان | ||
| N. Ghahreman* 1؛ B. Bakhtiari2 | ||
| 1Asst. Prof., College of Soil and Water Engineering, University of Tehran, Karaj, Iran | ||
| 2Shahid Bahonar University of Kerman, Kerman, Iran | ||
| چکیده | ||
| Precipitation and air temperature data, only, are often recorded at meteorological stations, with radiation being measured at very few weather stations, especially in developing countries. Therefore there arises a need for suitable models to estimate solar radiation for a completion of data sets. This paper is about an evaluation of eight models for an estimation of daily solar radiation (Q) from commonly measured variables in six synoptic stations of Iran, namely: Mashhad, Kerman, Tabriz, Esfehan, Hamedan and Zanjan using daily rainfall and temperature data for a duration of three years of 2000, 2001 and 2002. These stations represent several arid and semiarid sub-climates of Iran as based on extended-De Martonne climatic classification (semiarid-cold: Mashhad and Tabriz, arid-cold: Esfehan, Kerman, semiarid-extracold: Hamedan and Zanjan). The STATISTICA (ver. 6.0) software was employed for non-linear multivariate regression. The results indicated that most of the models overestimated in lower values of solar radiation while underestimating in the higher ranges, indicating a systematic error. Performance of the models was evaluated based on the Root Mean Square Errors (RMSE) as well as R2. RMSE ranged from 1.14 to 7.76 Cal cm-2min-1 for the whole data range and in all the six stations. Among the eight models, the Richardson model rendered the best agreement with the measured data in Kerman and Zanjan stations. In case of Hamedan station, Bristow and Campbell model was the most suitable. As for Tabriz station, De Jong and Stewart model using rainfall and range of daily temperature data led to the best performance. In Mashhad station, McCaskill equation can be recommended. Analysis of the data in Esfehan station showed no significant difference among the models. Due to variation in equations' performances, to come to valid conclusions and to choose the most suitable radiation models, further study would be required from other climatic regions the country. | ||
| کلیدواژه‌ها | ||
| Radiation models؛ Rainfall؛ Solar radiation؛ temperature | ||
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