River regime evolution of the wandering channel in the lower Yellow River based on long sequence
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Abstract:
The temporal and spatial evolution law of the wandering river regime in the lower Yellow River was analyzed to provide t heoretical support and practical value for further understanding the evolution characteristics of the lower Yellow River channel. Based on the systematic collection of river regime observation data of typical sections of the wandering channel in the lower Yellow River from 1960 to 2015, with the Mann-Kendall trend test and Fisher break point test method, the average river width and the migration rate of the mainline of the wandering channel in the lower Yellow River from 1960 to 2015 were analyzed. The results show that: in the past 60 years, the wandering channel in the lower Yellow River showed a clear manifestrion, that was, they were distributed in the shape of a lotus on the plane,while the temporal and spatial distribution of the mainline adjustment rate was not significant; the cross section of the lower Yellow River was the key node of the plane lotus-shaped distribution, and the whole river channd was divided into three sections (the first reach,Tiexie-Yudian section, with the average river width of 1627m; the second reach,Yudian-Chanfang section,with the average river width of 1477m; the third reach, Char fang-Gaocun section, with the average river widt h of 1074m, respectively).
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