纵向岭谷区红河的跨境径流量变化特征分析

THE CHARACTERISTIC ANALYSES OF THE TRANSBOUNDARY FLOW CHANGE OF THE HONGHE RIVER IN THE LONGITUDINAL RANGE-GORGE

以云南境内红河蛮耗站的多年径流量观测数据和云南的降水场、气温场观测数据为基础,应用小波变换和相关系数的统计分析方法,分析了红河的跨境径流量变化特征及其与云南气候变化的关系。结论为:近50年来,纵向岭谷区红河的跨镜径流量变化表现出了较大时间尺度的波动;径流量的年内分配不均,主要集中在云南雨季开始后的6～11月份;径流量的年际变化表现出了十分明显的多时间尺度特征,其特征时间尺度约为2年、8年和17年;红河的跨境径流量变化与云南干、雨季的降水量场变化之间存在有十分显著的相关关系,但与云南干、雨季的气温场变化之间的相关性不是很显著,说明红河的跨境径流量变化主要是由于云南降水量场的变化造成的。

Based on the observational data of the Honghe River flow in Manhao hydrometric station and precipitation field, temperature field in Yunnan, using the wavelet transform and correlation analysis method , the characteristics of the transboundary flow change of the Honghe River and the relationship with precipitation field and temperature field over Yunnan are analyzed. The results show that the evolution of transbondary flow of the Honghe River has fluctuations on large timescale in recent 50 years. Its annual distribution of isn＇t uniform, runoffs are concentrated during June to October which after starting of Yunnan＇s rain season. The annual variations of transbondary flow of the Honghe river obviously appear multi-timescale feature. It＇s characteristic timescales are 2-year, 8-year, 17-year. There are very significant correlations between the annual variations of the transbondary flow of the Honghe .River and the precipitation field in rain season and dry season over Yunnan, but the correlations with the temperature field isn＇t very significant. This illuminates the main reasons for the transboundary flow Variations for the Honghe River are the changes of the precipitation field over Yunnan.