石家庄市风环境容量变化特征及区划研究

利用气象观测、高分辨率城市地理信息、卫星遥感反演及ERA-Interim再分析资料,基于水平风速、混合层高度及地表粗糙度长度指标,利用等权重加权综合评价法和几何间隔分级法,开展了石家庄市风环境容量指标和区划研究,得到风环境容量指数分级阈值和空间分布.结果表明,石家庄市水平风速和大气混合层高度均由西部山区向东南部平原逐渐降低,在西南部山区存在一个高值区,在东南部平原存在一个低值区,且具有明显的季节和日变化特征;石家庄市区和西部山区地表粗糙度长度较大,平原地区较小;风环境容量指标分为低值区、次低值区、中等区、次高值区和高值区5个等级,在空间上石家庄市区及平原地区级别较低,西部和北部山区级别较高,其中石家庄市区、正定东南部、栾城东部、藁城大部分地区及无极西部是风环境容量最低区域,赞皇、高邑、赵县西南部、元氏西部、南部及井陉西南部为最高区域.

Variation characteristics and zoning research of wind environmental capacity in Shijiazhuang

Based on the meteorology observation data, high resolution urban geographic information, satellite remote sensing data and ERA Interim reanalysis data, and the horizontal wind speed, mixing layer height and surface roughness length factors, the research on the wind environmental capacity indexes and zoning in Shijiazhuang was carried out to obtain the classification threshold and spatial distribution of different levels of wind environmental capacity index by using the equal weighted comprehensive evaluation method and geometric interval classification method. The results showed that both the wind speed and mixing layer height with obvious seasonal and diurnal variations gradually decreased from the western mountainous area to the southeastern plain. The southwest mountainous area presented a high value center and the southeast plain exhibited a low value center. The surface roughness lengths were higher in Shijiazhuang urban area and western mountainous area, while smaller in plain area. The wind environmental capacity index thresholds were calculated at different levels, including low value zone, sub low value zone, median value zone, sub high value zone and high value zone. The capacity index was lower in urban and plain areas, including the southeast of Zhengding, the east of Luancheng, the most areas of Gaocheng and the west of Wuji. The higher value of wind environmental capacity index was mainly distributed in western and northern mountainous area, and the highest value was distributed in Zanhuang, Gaoyi, the southwest of Zhaoxian, the southwest of Yuanshi, and the southwest of Jingxing.