摘要
收集了青海省西北诸河地区降水资料,分析了该地区1956-2016系列降水的时间和空间分布规律,结果表明:①降水集中度及5-9月降水量呈微弱上升趋势,趋于不均匀化,集中期呈微弱下降趋势,有提前表现。②年降水呈显著增加趋势,且降水量时序具有长程相关性,预测将保持持续增加的趋势;在2001年前后发生突变;5个时间尺度的周期波动控制着年降水量在整个时域内的变化特征,其中以31a为主要周期。③降水量在地区平面分布上极不均匀,亦有东、南部山区向西北盆地递减,降水量的垂直差异明显,并呈现一定的规律性。④多年平均降水在空间上呈现由四周山区高值向柴达木盆地低值中心递进的态势,低值区域缩减。
Precipitation data of river basins in northwest region of Qinghai are collected to analyze the temporal and spatial distribution rules of precipitation in this region from 1956 to 2016.The results show that:①Precipitation concentration and precipitation from May to September shows a slight upward trend and tended to be uneven,while the concentration period shows a slight downward trend,showing an ahead trend.②The annual precipitation shows a significant increase trend,and the precipitation time series has a long-range correlation,which is predicted to maintain the trend of continuous increase;the abrupt change of precipitation around 2001.The periodic fluctuations of five time scales control the variation characteristics of annual precipitation in the whole time domain,of which 31 a is the main period.③Precipitation in the region is extremely uneven in the plane distribution,the eastern and southern mountainous areas are decreasing to the northwest basin,the vertical difference of precipitation is obvious and shows some regularity.④In space,the annual average precipitation shows a progressive trend from the high value of the surrounding mountain area to the low value center of Qaidam Basin,and the low value area shrinks.
作者
杨阳
时璐
刘弢
孙永寿
李燕
YANG Yang;SHI Lu;LIU Tao;SUN Yong-shou;LI Yan(Hydrology and Water Resources Survey Bureau of Qinghai Province,Xining 810001,China)
出处
《中国农村水利水电》
北大核心
2020年第8期159-165,共7页
China Rural Water and Hydropower
关键词
青海西北诸河
降水时空分布规律
趋势
预测
突变
周期
northwest region of Qinghai
spatial and temporal distribution of precipitation
trend
forecast
abrupt change
period
