Yin Yingze, Xia Rui, Liu Xiaoyu, Chen Yan, Song Jinxi, Dou Jinghui
Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, College of Urban and Environmental Sciences, Northwest University, Xi'an, 710127, China.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
Sci Rep. 2024 Apr 10;14(1):8373. doi: 10.1038/s41598-024-59129-w.
The spatial response mechanism of hydrology and water quality of large river-connected lakes is very complicated. In this study, we developed a spatial response analysis method that couples wavelet correlation analysis (WTC) with self-organizing maps (SOM), revealing the spatial response and variation of water level and water quality in Poyang Lake, China's largest river-connected lake, over the past decade. The results show that: (1) there was significant spatial heterogeneity in water level and quality during the dry seasons (2010-2018) compared to other hydrological stages. (2) We identified a more pronounced difference in response of water level and quality between northern and southern parts of Poyang Lake. As the distance increases from the northern lake outlet, the impact of rising water levels on water quality deterioration intensified during the dry seasons. (3) The complex spatial heterogeneity of water level and quality response in the dry seasons is primarily influenced by water level fluctuations from the northern region and the cumulative pollutant entering the lake from the south, which particularly leads to the reversal of the response in the central area of Poyang Lake. The results of this study can contribute to scientific decision-making regarding water environment zoning management in large river-connected lakes amidst complex environment conditions.
大型通江湖泊水文与水质的空间响应机制非常复杂。在本研究中，我们开发了一种将小波相关分析（WTC）与自组织映射（SOM）相结合的空间响应分析方法，揭示了中国最大的通江湖泊鄱阳湖在过去十年间水位和水质的空间响应及变化。结果表明：（1）与其他水文阶段相比，枯水期（2010 - 2018年）水位和水质存在显著的空间异质性。（2）我们发现鄱阳湖南北部水位和水质响应差异更为明显。在枯水期，随着距北湖口距离的增加，水位上升对水质恶化的影响加剧。（3）枯水期水位和水质响应复杂的空间异质性主要受北部地区水位波动以及南部入湖累积污染物的影响，这尤其导致鄱阳湖中部地区响应的反转。本研究结果有助于在复杂环境条件下，为大型通江湖泊水环境分区管理的科学决策提供依据。
