摘要
城市热环境变化影响城市小区域气候,探究影响因子与其作用机制,可有效减缓城市热岛现象。利用郑州市1960~2017年长序列数据,从相对热岛(RHI)和绝对热岛(AHI)两个层面探究驱动因子降雨(R)、蒸发(E)、建成区面积(B_(BUA))、城镇化率(U_(UR))的影响关系,利用交叉小波和小波相干探究热岛与降雨的雨热关系,采用Copula函数计算影响因子在不同取值条件下与热岛的遭遇概率。结果表明,相对热岛-相对降雨在短中周期、绝对热岛-降雨在短周期上均呈负相关关系,雨热关系不同步,且绝对热岛-降雨的关系最为显著;影响因子B_(BUA)、U_(UR)取值越大,R取值越小,则与RHI、AHI的遭遇概率越大;不同影响因子在不同评价层面,敏感性强弱不同,E在不同层面的反馈机制也不同,可见选取合适评价分析层面,有利于准确量化影响程度。
The urban thermal environment affects the climate of urban small regions, and the urban heat island phenomenon can be effectively mitigated by studying the principles of the impact factors. This paper investigated their relationship with rainfall(R), evaporation(E), built-up area(B_(BUA))and urbanization rate(U_(UR))in terms of both relative heat island(R_(HI)) and absolute heat island(A_(HI)) using long series data from 1960 to 2017 in Zhengzhou City. The cross wavelet transform and wavelet coherence were used to analyze the rain-heat relationship between heat islands and rainfall, and the Copula functions were used to calculate the conditional probability of the impact factors at different values and heat island. The results show that both the relative level of the short and medium period and the absolute level of the short period are negatively correlated, the rainfall-heat relationship is not synchronous, and the absolute heat island-rainfall relationship is the most significant;The greater the value taken for the impact factors(B_(BUA))and(U_(UR)), the smaller the value taken for R and the greater the conditional probability with RHI and AHI;Different impact factors have different sensitivity strengths at different levels of evaluation, and E has different feedback mechanisms at different levels, choosing the appropriate level of evaluation and analysis will allow for accurate quantification of the degree of impact.
作者
张金萍
晋位
ZHANG Jin-ping;JIN Wei(School of Water Conservancy Engineering,Zhengzhou University,Zhengzhou 450001,China;Yellow River Institute for Ecological Protection&Regional Coordinated Development,Zhengzhou University,Zhengzhou 450001,China)
出处
《水电能源科学》
北大核心
2022年第2期13-16,21,共5页
Water Resources and Power
基金
国家重点研发计划(2018YFC0406501)
河南省科技攻关项目(192102310508)
河南省自然科学基金项目(212300410404)。
关键词
相对热岛
绝对热岛
影响因子
交叉小波
小波相干
COPULA函数
relative heat island
absolute heat island
impact factors
cross wavelet transform
wavelet coherence
Copula functions
