A Simplified Calculation Method of Surface Solar Radiation over Rugged Terrains: the Procedure and its Application in Anhui Province

doi:10.3969/j.issn.1000-6362.2017.07.001

Abstract

Abstract: To rapidly and accurately estimate the surface solar radiation over rugged terrains, a simplified algorithm was established by considering the effect of astronomy, meteorology and topography factors, which included model of astronomical radiation over rugged terrains, climatological formula of surface solar radiation, and optimal interpolation scheme for sunshine percentage. A case study was then implemented in Anhui Province to illustrate the parameterization and application of the algorithm. Regression analysis was adopted to obtain the parameters of climatological formula by using observed solar radiation of 2 stations, and the relative error of the formula was 7.65%. Result of cross-validation indicated that the Thin Plate Spline method was the optimal interpolation scheme for sunshine percentage in Anhui Province. By using the simplified algorithm, the surface solar radiation at any location could be calculated on the basis of the percentage of sunshine and the digital elevation. Result indicated that the annual surface solar radiation was averaged at 4500MJ·m-2·y-1 in the province. As effected by the topographical and climate characteristics, the spatial pattern was dominated by more solar radiation gained in the north and less in the south of the province, while the southern slope of mountain received more solar radiation compared than the northern slope. The impact of terrains on the solar radiation showed different season characteristics, which is more significant in the winter half year. Moreover, the rugged terrains tended to reduce the solar radiation compared the flat plain in the summer half year. Further, the assessment of solar energy resources showed that the 3rd level of solar resources dominated in Anhui Province. The 4th level was identified in the northern slope of the Dabie and Wannan Mountains, while 2 level resource areas sporadically located in the southern slope of hilly in North Anhui. Due to the decline of percentage of sunshine, the significant decrease of global solar radiation was simulated by the method in Anhui Province in recent years.

Key words: Astronomical radiation, Sunshine percentage, Spatial analysis, Thin plate spline, Anhui province

LU Yan-yu, TIAN Hong, HOU En-bing, SUN Wei, DENG Han-qing, HE Dong-yan. A Simplified Calculation Method of Surface Solar Radiation over Rugged Terrains: the Procedure and its Application in Anhui Province[J]. Chinese Journal of Agrometeorology, 2017, 38(07): 397-406.

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