重庆市降水量的时空分布  

Temporal-Spatial Distribution of Precipitation in Chongqing

作　　者：陈忠[1] 任雪梅[1] 周心琴[1] 罗丽霞[1] 王建力[1] 李艳娜[2] 

机构地区：[1]西南师范大学资源与环境科学学院,重庆400715 [2]重庆商学院旅游管理系,重庆400076

出　　处：《四川师范学院学报（自然科学版）》2003年第2期171-176,共6页Journal of Sichuan Teachers College(Natural Science)

基　　金：教育部骨干教师基金资助项目(2001)

摘　　要：根据对重庆市98个雨量站从1950-1985年的降水资料的分析,探讨了重庆市年降水量的时空分布规律.在空间上,降水量自长寿沿东北方向,大致从1200mm先逐步降低至1100mm,然后开始增加,至大巴山区达到1800mm左右;自丰都沿东南方向,降水量大致从950mm开始逐步增加,至酉阳秀山一带达到1500mm左右.在大巴山区,降水量随海拔升高而增加.在岭谷间降水量的多少与水汽输送线路有关.在时间上,在长江河谷地区降水量存在约12年和18年的变化周期,在大巴山区存在约9,10年的变化周期,在川东平行岭谷区和乌江流域区则存在约11年或12年的变化周期.在四川盆地东部、大巴山区和乌江流域,降水量的季节变化明显,主要降水期集中在4-10月,其可占全年降水量的80%以上.Based on the precipitation database collected from 1950 to 1985 of ninety_eight rainfall stations in Chongqing, we have analyzed the precipitation features of Chongqing through temporal and spatial distribution. In space, the precipitation decreases firstly from about 1200mm to 1100mm, then begins to increase and reach about 1800mm around the Dabashan Mountains along the northeast direction from Changshou County. Similarly, the precipitation increases gradually from 950mm to 1500mm around Youyang and Xiushan Counties at the southeast direction from Fengdu County. In the Dabashan Moutains the precipitation increases as the altitude increases. In addition, the amount of precipitation in ridges and valleys is related to the passway of vapour_transporting. On the temporal aspect, the precipitation has a random change with various years. The precipitation has a regular periodical change of 12_years and 18_years in the region of valleys of the Yangtze River,9_years/10_years in the Dabashan Mountains and 11_years/12_years in the region of the Wujiang River and of eastern Sichuan Basin. It also has a decreased_trend change in the eastern part of Sichuan Basin, Dabashan Mountains and Wujiang Basin, but the decreased_extent of precipitation is different in these regions. However, the precipitation has a increased_trend change in the region of eastern Sichuan Basin. It is obvious that the precipitation has a seasonal change. The rain season is concentrated from April to October every year, and the rainfall occupies 80 precent of the annual precipitation.

关 键 词：重庆 降水量 时空分布 降水期 季节变化 水资源 

分 类 号：P426.613[天文地球—大气科学及气象学]