地面建筑物（群）对雷暴云大气电场影响的模拟研究

利用有限差分方法分析了地面建筑物(群)对雷暴云大气电场分布的影响,结果表明:①建筑物(群)的存在对周围大气电场存在较大的影响,建筑物顶部的大气电场明显强于地面,且随建筑物高度增加而增强.如建筑物的长、宽均为40 m,高度h=10、20、50、100 m时,楼顶的大气电场分别是地面(当建筑物不存在时地面相同位置)处的1.4、1.7、2.8和4.5倍.②地面建筑物(群)对地面电场存在明显的屏蔽作用,影响范围约为建筑物高度的3.5倍以内.因此,对大气电场的测量需要考虑周围建筑物(群)的影响.

Effect of Tall Buildings on Thunderstrom Electric Field

An analysis is made of the effect of tall buildings on the thunderstorm electric fields by using the finite difference method. The results show that： （1）The atmospheric electric fields are greatly affected by surrounding buildings; for example, the field intensities at the top of a 40m×40m building （at the center point of its flat roof） with the heights of 10, 20, 50, and 100 m are about 1.4, 1.7, 2.8 or 4.5 times greater than that o ground level in th this shielding effec of the height of th surface without any building, respectively. （2） The field intensity at the inity of the building is reduced relative to the case without buildings, with gligible at horizontal distances from the building exceeding about 3.5 times erefore, the errors caused by the tall buildings should be considered in the measurement of thunderstorm electric fields