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为揭示纵向岭谷区红河支流盘龙河流域输移率的变化状况及影响因素,文章采用小波分析数学方法,具体分析了盘龙河输沙率序列中存在的变化趋势、多时间尺度、周期性、突变性等特征.结果表明:盘龙河流域河流输沙率自1951年至1997年一直呈现出波动上升的趋势,而1998年以来有下降的倾向;输沙率的变化具有多时间尺度特征,不同时段振荡强度不同;就周期性而言,输沙率存在有4,7和22年的振荡周期,其中22年的振荡周期最为明显,贯穿整个研究时段,4年和7年尺度上局部特征突出;在4,7和22年时间尺度上分析输沙率的突变特征得知,4年尺度上的突变有27次,7年尺度上的突变有16次,22年尺度上的突变有5次,长时间尺度上嵌套着短时间尺度;结合社会统计数据和气候数据的分析得知,输沙率的变化趋势主要受人为扰动的影响,而多时间尺度、周期性和突变性特征则主要受气候变化的控制.
In order to reveal the changes of the Panlonghe River basin migration rate and its influencing factors in the tributary of the Red River in the Longitudinal Rift Valley, this paper analyzes the changing trend of the sediment transport rate sequences of the Panlong River by using the wavelet analysis mathematic method. The multi-time scales, The results show that the sediment transport rate of Panlonghe River basin has been fluctuating upward from 1951 to 1997, and has been declining since 1998. The change of sediment transport rate has multiple time scales Characteristics and oscillation intensity at different time periods. In terms of periodicity, there are 4, 7 and 22 years of oscillation cycle in the sediment transport rate, of which the 22-year oscillation period is the most obvious. Throughout the study period, on the 4-year and 7-year scales The local characteristics are prominent. By analyzing the abrupt change of sediment transport rate on the time scales of 4, 7 and 22 years, it is known that there are 27 mutations on the 4-year scale, 16 mutations on the 7-year scale and 22-year scale There are five times, on a long time scale, a short time scale is nested. According to the analysis of social statistics data and climate data, the trend of sediment discharge rate is mainly influenced by man-made disturbances, while many time scales, periods and mutations Characteristics are mainly affected by the climate Change control.