Characteristics of Fine Hourly Precipitation During Flood Season in Haidong Region
Based on the hourly precipitation data from 42 regional automated stations in the Haidong area from 2016 to 2022,the study analyzed the refined characteristics of precipitation in Haidong over the past seven years at different temporal scales.The findings were as follows:(1)There was a clear interannual variation in precipitation.The year 2018 experienced abnormally high rainfall.The peak rainfall time from 3 to 12 AM was advancing each year,and in 2021,the early morning peak had disappeared.This corresponded to the reduction in rainfall during the flood season in Haidong starting from 2021.(2)There was a significant monthly variation in rainfall in the Haidong area.The highest rainfall was typically in August,and the increase in precipitation during the flood season in the afternoon was primarily due to increased rainfall intensity.Unlike the total rainfall and frequency,the highest rainfall intensity mainly occured in July and August.(3)From 2016 to 2022,the annual average rainfall in the Haidong area generally showed a spatial distribution of"more in the mountains,less in the south".The volume and range of rainfall were characterized by"less during the day,more at night"and"greater at night,smaller during the day"respectively.Influenced by the altitude,there was a distinct characteristic of night rain,with the Yellow River valley receiving generally less rainfall.Due to the uneven distribution of the underlying surface,rainfall mainly concentrated from the afternoon to early evening,predominantly being convective in nature.The analysis results had important reference significance for better understanding the regional precipitation variation law and improving the level of refined precipitation forecasting.
万方数据
维普
