Study on hydrodynamic partition and total phosphorus standard in the Three Gorges Reservoir
XIE Pei1, SUN Ning1, FANG Yuan2, WANG Li-jing1, LI Hong1, QIAO Fei1
1. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; 2. Faculty of Resources and Environmental Science, Hubei University, Wuhan 430062, China
Abstract：The EFDC model was used to calculate water age in the Three Gorges Reservoir from 2010 to 2018. Result shows water age increased from the end to the head of the dam, especially in Baqian where water age over 100 days. With the lake attributes increased, tributaries nearby the dam were greatly affected. Dam operation has great influence on the water age, it will increase to 2~4 times during the high water level period. Based on the spatial distribution of water age, the Three Gorges Reservoir and its 17tributaries were divided into riverine, intermediate and lacustrine zones. Quantitative analysis of factors affecting water age showed that water age is positively correlated with water level, negatively correlated with discharge, and the change rate of drainage period is more obvious than that of impoundment period. Water age varies up to 6 to 7 days within unit flow and water level, and the variation range is between 30 and 100 days. Finally, the evaluation standard of total phosphorus in intermediate zone based on the weight method of water age was put forward, which revealed the temporal and spatial variation characteristics of total phosphorus, and provide scientific basis for the management and early warning of phosphorus pollution in the Three Gorges Reservoir.
谢培, 孙宁, 方源, 王丽婧, 李虹, 乔飞. 三峡水库水动力分区及总磷标准研究[J]. 中国环境科学, 2022, 42(10): 4752-4757.
XIE Pei, SUN Ning, FANG Yuan, WANG Li-jing, LI Hong, QIAO Fei. Study on hydrodynamic partition and total phosphorus standard in the Three Gorges Reservoir. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(10): 4752-4757.
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