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	Weakened hydrological oscillation period increased the frequency of river algal blooms
	Hu, Qiang1; Chen, Yan1,3; Xia, Rui1,2,5; Liu, Xiaoyu1; Jia, Ruining1,4; Zhang, Kai1; Li, Xiaoxuan1; Yan, Chao1,4; Wang, Yao1; Yin, Yingze1,4
	2024-05-15
摘要	The evolution of riverine aquatic ecosystems typically exhibits notable characteristic with cumulative, enduring, and hysteresis. Exploring the non-linear response of riverine ecology to long-term hydrological fluctuations become a major challenge in contemporary interdisciplinary research. In response to the critical issue of frequent river algal blooms in the lower Han River, which is impacted by Asian largest inter-basin water diversion project. We identified the non-linear response of eco-hydrology across various time scales through the integration of Continuous Wavelet Transform (CWT) and Inverse Wavelet Transform (IWT). Our study revealed that: 1) Over the past half century, the hydrological regime in the lower Han river showed a significant downward trend, and existed three significant hydrological oscillation periods (HOPs), including the short-scale Intra-AC (180 days), the medium-scale AC (365 days, the first major period), and the long-scale Inter-AC (2500 days), the variation of Inter-AC changed most dramatically. 2) We further found that the Inter-AC variation of hydrology is more closely related to the formation of river algal blooms in the Han River, and when the hydrological Inter-AC shows steady state or downward trend, the frequency of algal blooms in the lower Han River increases significantly. 3) The river algal blooms in the lower Han River is a cumulative consequence to the long-term hydrological influences. Weakened hydrological Inter-AC is more likely to increase the frequency of river algal blooms, and 10-years Inter-AC cumulation increased the frequency by 60%. Therefore, the weaken of long-scale HOP will significantly increase the frequency of river algal blooms in the future. This study received a critical scientific insight and aimed at provide guidance for the optimization of ecological management within the framework of national large-scale water conservation.
关键词	Han River River algal blooms Hydrological oscillation period Non-linear response Wavelet transform Long-term impact
DOI	10.1016/j.watres.2024.121496
发表期刊	WATER RESEARCH
ISSN	0043-1354
卷号	255页码:9
通讯作者	Xia, Rui(xiarui@craes.org.cn)
收录类别	SCI
WOS记录号	WOS:001218182900001
语种	英语