Title: Sunshine Hours Modeling and Spa-temporal Variation Analysis Based on DEM in Mountainous Area --Take Mentougou mountain in west Beijing as the example
Abstract: Sunshine hours is an important meteorological and ecological indicator.To understand its complex spa temporal distribution and variation in mountainous area is essential in the mountain research and development.We proposed an area based model to estimate daily amounts of sunshine hours based on Digital Elevation Model and the process of sunlight transmission.and took Beijing West Mountain Mentougou district as the example,modeled the monthly distribution of sunshine hours and analyzed the characteristics of its spa temporal variation.The results demonstrated that the derived values agreed well with the observed values of the two meteorological stations in study area,with R 2 =0.9722 and 0.9649 respectively.The temporal variation of sunshine hours was strong,with the average value of 14.41 h in July,10.54 h in March but 6.34 h in December,and characterized by: much in summer,less in winter and moderate in spring and fall. On the contrary,the standard deviation (SD) was much in winter but less in summer ,i.e.,2.33 in December,1.24 in March but 0.33 in July ,which meant that the spatial variation of sunshine hlurs in winter was stronger than other seasons.Then took the sunshine hours of midwinter day as the example and analyzed the characteristics of its distribution in spatial. The results demonstrated that the sunshine hours of units with different slope, aspec tand geomorphologic type had notable variation from 3.38 h to 8.87 h. It was suggested that this method could calculate the sunshine hours of different tine and space in various slope,aspect,geomorphology and shading condition.So it is important in the understanding of the sunshine hours' spa temporal distribution and variation of tilted surfaces,and in the research and application of land resources evaluation,natural conservation area planning,ecological process research and other related study subjects in mountainous area.
Publication Year: 2002
Publication Date: 2002-01-01
Language: en
Type: article
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Cited By Count: 1
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