Local flushing time and its relationship to reservoir eutrophication in Xiangxi Bay, China

IF 1.1 4区环境科学与生态学 Q4 LIMNOLOGY

Lake and Reservoir Management Pub Date : 2023-01-02 DOI:10.1080/10402381.2022.2137071

Qian Zhao, J. Mao, Haibin Cai, H. Dai

{"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.

查看原文本刊更多论文

湘西湾局部冲刷时间及其与水库富营养化的关系

摘要赵Q，毛J，蔡H，戴H.2023。湘西湾局部冲刷时间及其与水库富营养化的关系。湖泊保护区管理。39:72–87.水库蓄水往往会加速富营养化的进程。因此，藻类水华经常发生在轻度冲刷、富营养化的支流河口。作为表征水动力对水质影响的一个可靠而直接的标准，研究了支流进入中国三峡水库形成的狭长海湾的局部冲刷时间。我们使用校准的三维流体动力学和传输模型确定了局部冲洗时间。研究了以水位波动为特征的不同运行条件下局部冲洗时间的空间和时间变化。局部冲刷时间对上游来水和三峡水库干流回水均有响应。由于三峡水库的运行，海湾中频繁出现的密度流对局部冲刷时间的时空分布产生了显著影响。局部冲洗时间与总氮和溶解硅浓度呈正相关。局部冲刷时间的空间异质性表明，在海湾的中上部存在一个局部冲刷时间较长（即冲刷率较低）的特定区域。藻类水华的高风险区域与准滞流区重合。这些发现可能有助于制定管理弱冲刷富营养化海湾藻类水华的策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Lake and Reservoir Management 环境科学-海洋与淡水生物学

自引率

6.70%

发文量

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.