河南汝阳短时强降水特征分析

Characteristics of Short-term Rainstorm in Ruyang, Henan Province

本文利用汝阳县2013—2017年6—8月小时雨量资料,分析汝阳县夏季短时强降水的时空分布特征、天气学形式特征及雷达特征。结果表明:汝阳县短时强降水发生时间集中在"七下八上",在一天当中,下午和傍晚是短时强降水的高发期;靠近水源、有山地和丘陵抬升作用的地形有利于短时强降水回波的发生发展;南部山区易局地生成回波并加强发展,移入型回波以西向居多,且从生成到本责任区移动迅速、影响时间短、降水范围大、雨强相对较小。

Based on the hourly rainfall data from June to August of 2013 to 2017 in Ruyang County,the temporal and spatial distribution characteristics,synoptic forms and radar characteristics of short-term heavy precipitation in summer in Ruyang County were analyzed in this paper.The results showed that the occurrence time of short-term heavy precipitation in Ruyang County was concentrated on"seven to eight days",and in the middle of the day,the high occurrence period of short-term heavy precipitation was in the afternoon and evening;the terrain near the water source,with uplifting effect of mountains and hills was conducive to the occurrence and development of short-term heavy precipitation echoes;in the southern mountainous areas,local echoes were easily generated and developed.Most of the migratory echoes were from west to west,and they moved rapidly from generation to responsibility area,with short impact time,large precipitation range and relatively small rainfall intensity.