黄土高原可照时间空间分布特征研究  

Spatial Distribution of Insolation-Duration in Loess Plateau

作　　者：张刚[1] 汤国安[1] 宋效东[1] 常瑞雪[1] 

机构地区：[1]南京师范大学虚拟地理环境教育部重点实验室,江苏南京210023

出　　处：《武汉大学学报（信息科学版）》2015年第6期834-840,共7页Geomatics and Information Science of Wuhan University

基　　金：国家863计划资助项目(2011AA120303);江苏省高校自然科学研究重大资助项目(13KJA170001)~~

摘　　要：可照时间作为太阳活动的表现形式,是影响太阳辐射计算的重要参数之一。基于数据并行技术,综合考虑地形因子对可照时间的影响,提出了起伏地形下基于DEM的并行可照时间模型。利用黄土高原地区90m×90mSRTM作为基础数据,计算了整个黄土高原地区月、季、年可照时间的空间分布,定量分析了地形遮蔽度、坡度、坡向等地形要素对季节可照时间的影响。结果表明,黄土高原地区可照时间呈现出北高南低的分布特征,同一纬度不同地貌类型区的可照时间差异明显,表现出非地带性分布特征;黄土高原地区季节平均可照时间从大到小依次为夏季、春季、秋季、冬季,呈季节不对称性分布。可照时间受地形要素的影响显著,当地形遮蔽度大于0.6或坡度大于15°时,季节可照时间随遮蔽度或坡度的增大而减小;季节可照时间受坡向的影响基本相同,整体表现为阳坡、半阳坡大于阴坡、半阴坡,平坦开阔区优于地形起伏较大的山区。Based on the principle of data parallelism, we put forward a data partition and result fusion strategy, designing a parallelism insolation-duration model over rugged terrains, the monthly, seasonal and annual insolation-duration of Loess Plateau based on DEM with the resolution of 90 m×90 m is calculated with this model. In order to analyze its distribution, we also discuss the influence of terrain shading areas, slope and aspect on the insolation-duration of rugged terrain. In different landform areas of same latitude, insolation-duration displays a marked difference and presents non-zonality distri bution, particularly in winter with a lower sun elevation angle. The seasonal average insolation-duration of the Loess Plateau is greatest in the summer then the spring then autumn with winter having the lowest average insolation duration. This shows the asymmetry distribution of seasons. In the quantitative analysis, insolation-duration decreases along with the accretion of terrain shading areas upon reaching 0.6. In addition, when the slope of the study area was below 15, insolation-duration re mained largely unchanged; when the slope is upward of 15°, insolation-duration will sharply decrease. Meanwhile the influence of aspect is essentially the same in seasons.

关 键 词：黄土高原 数据并行 可照时间 地形要素 DEM 

分 类 号：P231[天文地球—摄影测量与遥感]