起伏地形下浙江省散射辐射时空分异规律模拟

结合影响起伏地形下太阳散射辐射的天空因素与地面因素,通过基于数字高程模型（DEM）数据的起伏地形下天文辐射模型和地形开阔度模型,综合考虑地面因素对散射辐射的影响;基于常规地面气象站观测资料建立的水平面散射辐射模型,考虑天空因素对散射辐射的影响;建立了起伏地形下浙江省散射辐射分布式估算模型;逐月计算了浙江省散射辐射（100m×100m）的空间分布。结果表明：散射分量分布与地理地形因子、季风影响、大气透明程度有关,由高纬向低纬逐渐增加;季节分布特点为,夏季〉春季〉秋季〉冬季;坡度、坡向对散射辐射的分布影响小,但辐射值与开阔度呈正相关,各季辐射最大值分布在开阔度大处,最小值在开阔度最小处,不同季节有所伸缩。计算结果可以为气候变化和环境资源研究提供基础数据。

A model of the spatial and temporal variation rules of diffuse solar radiation over rugged terrain in Zhejiang Province

Sky and terrain factors are elements influencing the Diffuse Solar Radiation（DSR）over rugged terrain.By using DEM data and the extraterrestrial solar radiation model and the terrain openness model,influences of terrain factors on the diffuse solar radiation are comprehensively evaluated.By using the horizontal diffuse solar radiation model simulated by routine meteorological observation data,influences of sky factors on DSR are evaluated.Thus,a model to calculate the diffuse solar radiation over rugged terrains in Zhejiang province was developed and the monthly spatial distribution of DSR was calculated.The results show that：the geographical and topographical factors,the monsoon influence and the atmosphere transparence exert effects on spatial distribution of DSR;the annual DSR presents a decreasing trend form south to north;the order of seasonal DSR is summerspringautumnwinter;the maximum（minimum）DSR lie in the open areas（shaded areas）and has little to do with the slope and aspect.It varies in different seasons.The results can provide data for researches of climate change and environmental resources.