Mutation analysis of annual sediment discharge at Wu Long station in Wu Jiang River Basin from 1960 to 2016


Autoři: Peng Chen aff001;  Guangming Tan aff001;  Jinyun Deng aff001;  Quanxi Xu aff003;  Rouxin Tang aff001
Působiště autorů: State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, China aff001;  Key Lab. of River Regulation and Flood Control of Ministry of Water Resources, Changjiang River Scientific Research Inst., Wuhan, China aff002;  Bureau of Hydrology, Yangtze River Water Resources Commission, Wuhan, China aff003
Vyšlo v časopise: PLoS ONE 14(12)
Kategorie: Research Article
doi: 10.1371/journal.pone.0225935

Souhrn

This article introduces a new method for mutation detection, the approximate entropy method, which is based on the complexity of time series. The mutation of average annual sediment discharge in Wu Jiang River Basin from 1960 to 2016 is detected by the introduced approximate entropy method, and compared with the results of double cumulative curve method and B-G segmentation algorithm. The mutation physical mechanism of the sediment discharge is discussed from the aspects of sediment source, annual distribution and interannual variation, climate change, impact of water conservancy and water conservation projects on sediment transport. The results show that mutation points occurred at 1984 and 2008 at Wu Long station, and the sediment discharge has a significant change after 2008. The mutation of average annual sediment discharge in Wu Jiang River Basin is caused by both climate change and human activity. Sediment reduction effect of the hydraulic engineerings built since 1990s climate is main and direct, and the climate change have secondary effect on sediment discharge change.

Klíčová slova:

Entropy – Erosion – Mutation detection – Point mutation – Power stations – Rivers – Sediment – Surface water


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2019 Číslo 12