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1基本情况新郑市位于豫西山区向豫东平原过渡地带,地形自西向东依次为山区、丘陵、平原、沙岗兼洼,总面积873km~2,属于淮河流域。境内主要有12条河流,总长度为223．82km,河道平均坡降为1．7‰,沟壑密度0．46km/km~2。气候属温带大陆性季风气候,多年平均气温为14．15℃,极端最高气温425℃,多年平均降雨量为679．0mm,年最大降雨量为1172．2mm(1967年),年最小降雨量为449．4mm(1966年),降雨在时间分布上不均,汛期(6～9月)多年平均降雨量为440．3mm,占全年降雨量的64．86%。按降水比例分布:平水年、丰水年、枯水年分别占80%、13．3%、6．7%。因受冷暖气团交替影响,干旱、暴雨、霜冻、大风、低温、干热风等灾害性天气较多,尤其是干旱、雨涝、干热风危害性最大。
1 Basic Situation Xinzheng City is located in the transitional zone from the mountainous area of Henan to the east of the Yudong Plain. The terrain is mountainous, hilly, plain, sandy hill and depression with a total area of 873km ~ 2 from west to east, belonging to the Huaihe River Basin. The territory of the main 12 rivers, the total length of 223.82km, the average gradient of the river was 1.7 ‰, gully density 0.46km / km ~ 2. The climate is a temperate continental monsoon climate, the annual average temperature of 14.15 ℃, the extreme maximum temperature of 425 ℃, the average annual rainfall of 679.0mm, annual maximum rainfall of 1172.2mm (1967), the minimum annual rainfall of 449 .4mm (1966), the uneven distribution of rainfall in time, the flood season (June to September) the average annual rainfall of 440.3mm, accounting for 64.86% of the annual rainfall. According to the proportion of precipitation distribution: flat water years, wet years, dry years accounted for 80%, 13.3%, 6.7%. Due to the alternating influence of cold and warm air mass, the disastrous weather such as drought, heavy rain, frost, gale, low temperature and hot and dry wind are more, especially the droughts, rain and floods and the hot and dry wind are most harmful.