图  1  2021年7月17日08：00—23日08：00河南省中北部气象站(a)和水文站(b)累积雨量、河南省中北部及周边地形高度(黑色曲线为河南省界线，细灰色曲线为市界线)(c)，气象站和水文站分布(d)

Fig. 1  Accumulated rainfall from 0800 BT 17 Jul to 0800 BT 23 Jul in 2021 based on meteorological(a) and hydrological(b) observations, terrain elevations over central and northern Henan Province and its surroundings(the black thick curves denote provincial boundaries, the grey thin curves denote city boundaries)(c), distribution of meteorological and hydrological rain gauge stations(d)