基于REOF的珠江三角洲河网区水位时空变异特征分析

Spatiotemporal variation of water level in Pearl River Delta network area based on REOF

基于1962—2016年珠江三角洲河网区12个水文站的月平均水位资料,利用Mann-Kendall趋势检验法、旋转经验正交函数法(REOF)等方法分析了该地区平均水位的时间演变趋势和空间分布特征。结果表明:水位呈显著上升趋势的月份主要集中在1—3月和12月,水位呈显著下降趋势的月份主要集中在8—9月;珠江三角洲河网区平均水位分布特征可划分为4个典型空间异常型,第一空间异常型表现为旱季水位呈上升趋势,雨季水位呈下降趋势,第二、三、四空间异常型均表现为旱季和雨季水位均为先上升再下降的趋势。

Based on the monthly mean water level data of 12 hydrological stations in the Pearl River Delta network area from 1962 to 2016,the temporal evolution trend and spatial distribution characteristics of the monthly mean water level were analyzed using the Mann-Kendall trend test and the rotated empirical orthogonal function(REOF).The results show that the water level showed a significantly increasing trend mainly in the period from January to March and in December and a significantly declining trend mainly in August and September.The distribution of the mean water level in the Pearl River Delta network area can be classified into four spatial modes.The water level in the first spatial mode increased in the dry season and decreased in the rainy season.The water level in the second,third,and fourth spatial modes increased first and then declined in both the dry season and rainy season.