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- Title
珠江三角洲顶部节点分流特征及影响因素分析.
- Authors
黄鹏飞; 刘 培; 许 伟
- Abstract
By using the methods of ensemble empirical mode decomposition and Mann-Kendall mutation test, the measured hydrological da‐ ta of the top flow node and its upstream control station in the Pearl River Delta from 1959 to 2020 are analyzed, the distributary characteris‐ tics, correlation and trend change of the top node under the influence of geomorphic evolution and runoff-tidal current dynamic change are studied. The results show that because of the change of delta topography and its impact on the adjustment of runoff dynamics, the sudden change year of annual average diversion ratio and flood season average diversion ratio of Sanshui Station is 1988 and 1991, no evidence shows that dry season average diversion ratio has significant abrupt change. However, due to the large scale topographic cutting in the Pearl River Delta, especially the dramatic geomorphic change at key nodes and the resulting adjustment of runoff-tidal current dynamics, the di‐ vergence at the peak of the Pearl River Delta in dry seasons from 2010 to 2020 was more unstable than that from 2000 to 2010. There is a strong correlation between Sanshui Station and Makou Station in flood seasons, and it began to show an increasing trend around 2005 with an annual increase of about 0.001 6. On the contrary, Sanshui Station, Shijiao Station and Wuzhou Station always showed a weakening trend, with an annual decrease of -0.004 7 and -0.003 3, Sanshui Station is increasingly affected by Makou Station year by year. The correlation coefficients of Sanshui Station, Wuzhou Station, Shijiao Station, and Makou Station all show high frequency variation cycles of less than 5 months and about 1 year, the diverting ratio of Sanshui Station showed more obvious short period variation than the other three stations and there were differences of flood and dry season and inter-annual variation inside. In the long run, the diversion ratio of Sanshui Station shows an increasing trend regardless of the annual average or flood season, and the diversion uniformity of Makou and Sanshui Stations keeps increasing. At present, the diversion at the top of the Pearl River Delta has changed from a simple runoff to a complex process of runoff and tidal interaction, and the influence of tidal dynamic factors on the diversion at the top of the delta cannot be ignored.
- Subjects
HILBERT-Huang transform; FLOOD risk; TOPOGRAPHY; RUNOFF; STATISTICAL correlation; SEASONS; FLOODS
- Publication
China Rural Water & Hydropower, 2022, Issue 12, p86
- ISSN
1007-2284
- Publication type
Article
- DOI
10.12396/znsd.220283