摘要随着合肥城市化的进程不断加快，城镇化规模不断扩大，城市下垫面粗糙程度不断增加，城市降水问题在城市化急剧发展的背景下显得日益突出，与之有关的城市内涝及一系列问题发生的可能性及其造成的损失正在变得越来越大。依据合肥1975-2014年城市化率的特点以及对合肥市的代表雨量站从1975-2014年的降水变化情况进行研究，统计分析年降雨量、汛期（5-10月）降雨量、主汛期（7-8月）降雨量和累计相对偏差等。研究结果表明：合肥市受城市化的影响，年降水量有增加的趋势且降雨变化主要集中在汛期尤其是主汛期。同时，城市化对城市降雨次数也有影响，其中主要体现在大雨、暴雨次数的增加。造成这种影响的机制主要有城市热岛效应、高层建筑阻碍效应和城市凝结核效应。72924

该论文有图6幅，表2个，参考文献10篇。

毕业论文关键词：城市化率  合肥市  降水量   

Hefei impact of urbanization on regional precipitation

Abstract With the accelerating urbanization process in He Fei,the scale of it is getting exp-anding constantly also。 Simultaneously,the roughness of underly surface is increasin-g,it is the precipitation problem that becoming prominent under the background of rap-id urbanization development,the urban waterloggong and the possibility of a series of problems which concerned with it are getting more and more likely。 What’s more, th-e lost that may cause is faced with the same situation。

Having researched on the basis of He Fei’s characteristics of the urbanization rate and the precipitation change in representative station from 1975 to 2014。At the same time, by the data collected and analyzed, including rainfull, flood season’s(May to October) precipitation,major flood season’s(July to August) precipitation, and the cumulative r-elative deviation, the results showed that: by the influence of urbanization, He Fei’s annual precipitation has the trend of inceasing, and the precipitation change mainly co-ncentrated in the flood season particularly in the major flood season。 Meanwhile, urb-anization has an impact on rainfall frequency, mainly reflected in the incease of heav-y rain and rainstorm, the mechanism which caused the problems are Urban heat islan-d effect, High-rise building block effect and City condensation nuclei effect。 

Key Words: urbanization  Hefei  precipitation

目  录

摘  要 III

Abstract IV

目  录 V

图清单 VI

表清单 VI

变量注释表 VI

1 引言 1

2 研究区概况和研究方法 3

2。1研究区概况 3

2。2资料选取 3

2。3研究方法 3

3 结果分析 5

3。1合肥市区降水变化分析 5

3。2合肥城市化率与降水关系 8

4 结论 11

参考文献 12

致谢 13

图清单

图序号 图名称 页码

图1 合肥站各降雨类型日数占年降雨日数百分比