Distributed Modeling Of Solar Radiation And Spatial Distribution Characteristrics In China Based On DEM

Energy is an important foundation for economic and social development.Due to the rapid increase in energy demand,it has become a consensus to fully develop and use green clan solar energy resources.As a basic energy source for other various renewable energy sources,total solar radiation has great potential for the development of the industry.With the continuous advancement of meteorological and GIS application technologies,the accurate calculation and refined assessment of solar energy resources will become the key factors for large-scale development and utilization.The spatial distribution of solar energy resources is influenced by multiple factors such as actual terrain,climate,and underlying surface.As the digital elevation model(DEM)of the digital representation of the surface morphology,the resolution is an important indicator of the accurate and efficient expression of the terrain.Therefore,the higher resolution DEM is the basis and prerequisite for the fine simulation of the spatial distribution of solar energy resources.Based on DEM data of China with a resolution of 30 meters,the spatial distribution of Extraterrestrial Solar Radiation(ESR)and Direct Solar Radiation(DSR)over rugged terrains of China was calculated by using parallel computing framework of MATLAB software.Using Spatial analysis,geostatistical semivariograms,and multiscale data comparisons methods to analyze spatial distribution of Insolation-Duration,ESR and DER over rugged terrains of China.The content of the analysis includes the influences of slopes and aspects,the spatial scale effects of DEM,the different types of landforms and the spatial variability.The results clearly depict that the distributed estimation of ESR and DSR by using the MATLAB parallel framework to do well on the overall macro-distribution and local differences.The spatial distribution of ESR and DSR is affected by altitude and local topography.The local terrain factors on ESR will be vary from time,latitude,slope and aspect.The percentage of sunshine under the influence of climate conditions will be another important component of DSR.The ESR and DSR are related to the features of landform types,climate and environment under different landform types.Then,mountainous landforms are most greatly affected by terrain obscuration because of the topographic relief.Based on high-resolution DEM data to estimation of solar radiation over rugged terrains of China,which not only is good for improving the refinement of the overall simulation,but also is of great benefit to an in-depth understanding of the spatial distribution of solar radiation under local topography.Introducing geostatistical semivariograms to analyze the spatial variability of ESR and DSR is a new attempt to reveal the correlation between the spatial distribution of solar radiation and astronomical elements,latitude,slope,and aspect.The higher resolution solar radiation spatial distribution data has very important theoretical significance and broad application prospects for the in-depth and detailed evaluation of solar radiation energy resources.It is also an important basic guarantee and prerequisite for the effective development and utilization of solar energy resources.