长江上游亚高山降水与径流时间序列的非线性特征

Non-linear characteristics of precipitation and runoff in sub-alpine of the upper reaches of Yangtze River.

运用GP算法 ,利用长江上游亚高山 12a的降水时间序列 (序列长度为 4 32 )和 9a的径流时间序列 (序列长度为32 4 )构建n维嵌入相空间 ,拟合得到了该区降水时间序列和径流时间序列的关联维数分别为 2 4和 2 8.该值具有不随时间尺度变化而变化的特性 ,意义在于可以从某一时段降水或径流时间序列的信息中获知更长时段的信息 ,也可以从长时段序列信息中提取某一时段的信息 .而且该分维数的求取可以说明至少有

Temporal sequences of precipitation and runoff in sub alpine of the upper reaches of the Yangtze River are analyzed using GP arithmetic and their fractal dimensions are measured to be 2 4 and 2 8 respectively. The two fractal dimensions imply that information, which exist in short period can be deduced from which in long period and the so is the reverse. Moreover, result of at least three factors controlling the temporal sequence dynamics of precipitation and runoff can be deduced from the obtained fractal dimensions.