澜沧江月径流量变化的相关性和多时间尺度特征

 以云南境内澜沧江1955年1月～2001年12月的逐月径流量观测数据为基础,应用相关分析和小波变换的分析方法,研究了云南境内澜沧江月径流量变化的相关性特征和多时间尺度特征.结论为:云南境内澜沧江下游的月径流量变化不仅显著地包含了上游的月径流量变化,而且还更显著地包含了云南境内的月气候变化影响.云南境内澜沧江月径流量变化表现出了十分明显的多时间尺度变化特征.澜沧江上游地区的月气候变化和云南境内的月气候变化均可能存在有约4个月和53个月的特征时间尺度变化.澜沧江下游允景洪的约7个月、30个月和74个月的特征时间尺度的月径流量变化主要是由澜沧江上游旧州的月径流量变化造成的;而澜沧江下游允景洪的约14个月和21个月的特征时间尺度的月径流量变化则完全是由云南境内的月气候变化造成的.对于较小特征时间尺度的变化,云南月气候变化造成的澜沧江月径流量变化一般是相同或滞后于澜沧江上游的月径流量变化;而对于较大特征时间尺度的变化,云南月气候变化造成的澜沧江月径流量变化则总是滞后于澜沧江上游的月径流量变化.

Correlation and multi-timescale characteristics of the monthly variations for Lancang River flow in the region of Yunnan

Based on the observational data of the Lancang River flow from January 1995 to Decembe 2001,the correlation and multi-timescale characteristics of the monthly variations for Lancang River flow in the region of Yunnan are investigated.With the correlation analysis and wavelet transform,the results show that over the lower reach Lancang of River flow's are influenced by the upper reach fo Lancang River flow's variations,and the climate changes over Yunnan.The monthly variations for Lancang River flow in the region of Yunnan obviously appear multi-timescale features.There might be 4 and 53 months' characteristic timescales of the monthly climate changes over the regions of the upper and lower reaches Lancang River.The 7,30 and 74 months' characteristic timescales of Yinjinghong are due to the flow's variations of Jiuzhou,but the 14 and 21 months' characteristic timescales of Yinjinghong are due to the monthly climate changes over Yunnan.Corresponding to the smaller characteristic timescale,the time phases of the flow's variations influenced by the monthly climate changes over Yunnan equal or lag the time phases of the upper reaches Lancang River flow's variations.For the larger characteristic timescale,the time phases of the flow's variations influenced by the monthly climate changes over Yunnan always lag the time phases of the upper reaches Lancang River flow's variations.