Analysis of temporal and spatial distribution of temperature and precipitation in Weihe River Basin from 1984 to 2021
The ecological environment of the Weihe River Basin is fragile,and precipitation and temperature are directly related to agricultural production in the region.Based on the precipitation and temperature data from 14 meteorological sta-tions in the Weihe River Basin from 1984 to 2021,this article analyzes the spatial and temporal variation characteristics of precipitation and temperature in Weihe River Basin through trend analysis,M-K mutation test,wavelet analysis,spatial interpolation,and other methods.The results show that:(1)The annual average temperature and maximum temperature in the Weihe River Basin show a significant upward trend,with a rate of increase of 0.33℃/10a.The annual average tem-perature experienced a sudden change in 1996.During the study period,the oscillation degree of the first main cycle(16a)decreased and then increased,and the corresponding fluctuation degree of the second main cycle(6a)remained rel-atively stable.(2)The annual average precipitation shows a significant upward trend(2.85 mm/a),with a sudden change around 2018 and four oscillation periods of 3a,8a,13a,and 26a.(3)The average temperature and minimum temperature in space for many years are distributed as"low in the north and high in the south",while the maximum temperature is dis-tributed as"low in the east and west,and high in the north and south".The middle and lower reaches of the main stream of the Weihe River are areas where high temperature values are concentrated.(4)The annual average precipitation shows a spatial distribution pattern of"high in the southeast and low in the northwest"and"high in the downstream and low in the upstream",with Huashan Station and Fengxiang Station as the centers of high precipitation values.
precipitation and temperaturespatial and temporal distributionwavelet analysistrend testWeihe River Basin
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