绿兰水文站1982-2016年径流量演变特征分析

Analysis of runoff evolution characteristics from 1982 to 2016 at Lvlan Hydrological Station

为了研究中小河流径流量演变的特征,选用线性趋势法、morlet小波分析法、Mann-Kendall突变检验法等多种方法,对绿兰水文站1982-2016年35 a径流量变化趋势性、突变性、周期性进行分析。结果表明:(1)绿兰水文站径流量序列整体呈微弱上升变化趋势,年上升量为0.0 085 m^3/s;(2)径流量序列不存在实质性突变;(3)径流量序列存在多尺度周期变化规律,第一主周期为30 a,第二主周期为12 a,第三主周期为5 a。

In order to study the runoff evolution characteristics of medium and small rivers, the runoff trend, mutation and periodic characteristics of runoff at Lvlan Hydrological Station were analyzed based on 35 years of records from 1982 to 2016 by means of linear trend method, morlet wavelet analysis and Mann-Kendall mutation test method.The results of analysis demonstrate the runoff series of Lvlan Station generally has a slight upward trend with a yearly increase of 0.0085 m^3/s;there exit no substantial mutation of runoff series;the runoff series have multi-scale periodic change rule with the first principal period of 30 a, the second principal period of 12 a and the third principal period of 5 a.