{"title":"Local flushing time and its relationship to reservoir eutrophication in Xiangxi Bay, China","authors":"Qian Zhao, J. Mao, Haibin Cai, H. Dai","doi":"10.1080/10402381.2022.2137071","DOIUrl":null,"url":null,"abstract":"Abstract Zhao Q, Mao J, Cai H, Dai H. 2023. Local flushing time and its relationship to reservoir eutrophication in Xiangxi Bay, China. Lake Reserv Manage. 39:72–87. Reservoir impoundment often accelerates the process of eutrophication. Consequently, algal blooms frequently occur in weakly flushed, eutrophic tributary embayments. As a reliable and straightforward criterion for characterizing the hydrodynamic influence on water quality, local flushing time was investigated in a long, narrow bay formed where a tributary enters the Three Gorges Reservoir in China. We determined the local flushing time using a calibrated 3-dimensional hydrodynamic and transport model. The spatial and temporal variations of the local flushing time were studied under different operational conditions characterized by water level fluctuations. The local flushing time showed responses to both upstream inflow and the Three Gorges Reservoir mainstream backwater. The spatial–temporal distributions of local flushing time are significantly affected by density currents that frequently occur in the bay because of the operation of the Three Gorges Reservoir. Positive correlations were found between local flushing time and total nitrogen, and dissolved silicon concentrations. The spatial heterogeneity of local flushing time demonstrates that there is a specific zone with a longer local flushing time (i.e., low flushing rates) in the upper middle portion of the bay. High-risk areas for algal blooms coincide with the quasi-stagnant flow zone. These findings could help to develop strategies to manage algal blooms in weakly flushed eutrophic bays.","PeriodicalId":18017,"journal":{"name":"Lake and Reservoir Management","volume":"39 1","pages":"72 - 87"},"PeriodicalIF":1.1000,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Lake and Reservoir Management","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1080/10402381.2022.2137071","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"LIMNOLOGY","Score":null,"Total":0}
引用次数: 1
Abstract
Abstract Zhao Q, Mao J, Cai H, Dai H. 2023. Local flushing time and its relationship to reservoir eutrophication in Xiangxi Bay, China. Lake Reserv Manage. 39:72–87. Reservoir impoundment often accelerates the process of eutrophication. Consequently, algal blooms frequently occur in weakly flushed, eutrophic tributary embayments. As a reliable and straightforward criterion for characterizing the hydrodynamic influence on water quality, local flushing time was investigated in a long, narrow bay formed where a tributary enters the Three Gorges Reservoir in China. We determined the local flushing time using a calibrated 3-dimensional hydrodynamic and transport model. The spatial and temporal variations of the local flushing time were studied under different operational conditions characterized by water level fluctuations. The local flushing time showed responses to both upstream inflow and the Three Gorges Reservoir mainstream backwater. The spatial–temporal distributions of local flushing time are significantly affected by density currents that frequently occur in the bay because of the operation of the Three Gorges Reservoir. Positive correlations were found between local flushing time and total nitrogen, and dissolved silicon concentrations. The spatial heterogeneity of local flushing time demonstrates that there is a specific zone with a longer local flushing time (i.e., low flushing rates) in the upper middle portion of the bay. High-risk areas for algal blooms coincide with the quasi-stagnant flow zone. These findings could help to develop strategies to manage algal blooms in weakly flushed eutrophic bays.
期刊介绍：
Lake and Reservoir Management (LRM) publishes original, previously unpublished studies relevant to lake and reservoir management. Papers address the management of lakes and reservoirs, their watersheds and tributaries, along with the limnology and ecology needed for sound management of these systems. Case studies that advance the science of lake management or confirm important management concepts are appropriate as long as there is clearly described management significance. Papers on economic, social, regulatory and policy aspects of lake management are also welcome with appropriate supporting data and management implications. Literature syntheses and papers developing a conceptual foundation of lake and watershed ecology will be considered for publication, but there needs to be clear emphasis on management implications. Modeling papers will be considered where the model is properly verified but it is also highly preferable that management based on the model has been taken and results have been documented. Application of known models to yet another system without a clear advance in resultant management are unlikely to be accepted. Shorter notes that convey important early results of long-term studies or provide data relating to causative agents or management approaches that warrant further study are acceptable even if the story is not yet complete. All submissions are subject to peer review to assure relevance and reliability for management application.
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