摘要
本文利用40a的四川地面台站的降水和气温资料，从计算分析可利用降水系数人手，分析了四川地区水资源的基本特征，给出了一些定量评估的结果。研究表明，四川地区的水资源季节变化明显，降水量和蒸发量高度集中在夏季，冬季最少。年可利用降水系数为0．45，与降水量和蒸发量的季节差异一样，冬季可利用降水系数最小，夏季最大，秋季大于春季。可利用降水系数一年之内，1-7月逐渐增大，8-12月逐渐减少。总体来说，四川地区可利用降水资源的空间分布不均，其中四川盆地的可利用降水系数低于川西高原和攀西地区。
Using 40a ground observational data from 143 meteorological stations in Sichuan, this study addresses the char- acteristics of usable precipitation of Sichuan. The results show that water resources in Sichuan area obviously seasonal change, precipitation and evaporation are highly concentrated in summer, while winter has least precipitation and evaporation. Annual usable precipitation coefficient is 0.45, like precipitation and evaporation characteristics, the usable precipitation coefficient in winter is the smallest, largest in summer, and the usable precipitation coefficient in autumn is higher than it in spring. There is a normal distribution of usable precipitation coefficient in a year, increasing from January to July and reducing from August to December gradually. In general, the distribution of usable precipitation coefficient in Sichuan is uneven, the usable precipitati- on coefficient in Sichuan Basin is lower than it in the Western Plateau and Panxi area.
出处
《高原山地气象研究》
2013年第3期83-86,共4页
Plateau and Mountain Meteorology Research
基金
西南区域气象中心2011年区域重大科研业务项目"西南地区空中云水资源评估和开发利用研究"(西南区域气2011-02)
关键词
四川地区
可利用降水
蒸发量
Sichuan, usable precipitation, evaporation
