solar radiation estimation from rainfall and temperature data in arid and semi-arid climates of iran
نویسندگان
چکیده
precipitation and air temperature data, only, are often recorded at meteorological stations, with radiation beingmeasured at very few weather stations, especially in developing countries. therefore there arises a need for suitablemodels to estimate solar radiation for a completion of data sets. this paper is about an evaluation of eight models foran 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 ofthree years of 2000, 2001 and 2002. these stations represent several arid and semiarid sub-climates of iran as basedon 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-linearmultivariate regression. the results indicated that most of the models overestimated in lower values of solar radiationwhile underestimating in the higher ranges, indicating a systematic error. performance of the models was evaluatedbased on the root mean square errors (rmse) as well as r2. rmse ranged from 1.14 to 7.76 cal cm-2min-1 for thewhole data range and in all the six stations. among the eight models, the richardson model rendered the bestagreement with the measured data in kerman and zanjan stations. in case of hamedan station, bristow and campbellmodel was the most suitable. as for tabriz station, de jong and stewart model using rainfall and range of dailytemperature data led to the best performance. in mashhad station, mccaskill equation can be recommended. analysisof 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 berequired from other climatic regions the country.
منابع مشابه
Solar Radiation Estimation from Rainfall and Temperature Data in Arid and Semi-arid Climates of Iran
Precipitation and air temperature data, only, are often recorded at meteorological stations, with radiation beingmeasured at very few weather stations, especially in developing countries. Therefore there arises a need for suitablemodels to estimate solar radiation for a completion of data sets. This paper is about an evaluation of eight models foran estimation of daily solar radiation (Q) from ...
متن کاملInvestigating the interaction between rivers and sand dunes in arid and semi-arid regions of Iran
Extended abstract 1- Introduction Fluvial and aeolian processes are important factors in changing the surface of morphology in the Earth. When rivers and sand dunes meet, the transportation of sediment between them can lead to one of the systems or both of them change. With their connection between river sediment and wind systems there would be lots of reactions, but very little has been st...
متن کاملUse of the IHACRES rainfall-runoff model in arid and semi arid regions
Streamflow in arid and semi-arid regions tends to be dominated by rapid responses to intense rainfall events. Such events frequently have a high degree of spatial variability, coupled with poorly gauged rainfall data. This sets a fundamental limit on the capacity of any rainfall-runoff model to reproduce the observed flow. The IHACRES model is a parameterically efficient rainfall-runoff model t...
متن کاملFractional vegetation cover estimation in arid and semi-arid environments using HJ-1 satellite hyperspectral data
This paper evaluates the usefulness of the hyperspectral imager (HSI) onboard Chinese HJ-1-A small satellite in vegetation mapping. Fractional vegetation cover (FVC) is an important surface microclimate parameter for characterizing land surface vegetation cover as well as the most effective indicator for assessing desertification and crop growth condition. The HJ-1/HSI data were used to calcula...
متن کاملThe Landscape as a Unit for Rangeland Inventory in Arid and Semi-arid Regions of Iran
Severe range degradation was critically extended in many region of Iran and caused many rangelands were restricted and interwoven with croplands in a complex system. Therefore, rangeland planning and inventory as an isolated activity has become almost impossible. Current landscape planning involves contributions of different social organizations often with different interests and with different...
متن کاملمنابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
desertناشر: international desert research center (idrc), university of tehran
ISSN 2008-0875
دوره 14
شماره 2 2009
کلمات کلیدی
میزبانی شده توسط پلتفرم ابری doprax.com
copyright © 2015-2023