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| 风对石臼湖底泥磷释放的影响 |
| Impact of Wind on Phosphorus Release from the Sediments in Shijiu Lake |
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| DOI： |
| 中文关键词: 磷 风生流 预警指标 底泥 浅水湖泊 石臼湖 |
| 英文关键词: Phosphorus Wind driven current Early warning indicator Sediments Shallow lake Shijiu Lake |
| 基金项目:国家重点研发计划基金资助项目（2022YFC3204400） |
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| 摘要点击次数: 27 |
| 全文下载次数: 14 |
| 中文摘要: |
| 针对长江通江浅水湖泊石臼湖低水位期总磷（TP）易超标的问题，在实测气象、水质数据的基础上定性分析风对石臼湖国考断面TP超标的影响，通过室内静态释放试验和动态释放试验定量分析风对底泥磷释放的影响。结果表明：低水位期风扰动下的底泥磷释放是石臼湖国考断面TP超标的主要原因；石臼湖底泥具有密度小、有机质占比高、含磷量高（尤其是颗粒态磷）、粉土占比高的特点，易于在扰动情况下悬浮；在静水状态下，石臼湖底泥能维持较稳定的磷吸附-释放平衡，释放量在±2mg/（m2·d）范围，扰动会显著促进其再悬浮磷释放，释放量＞15mg/（m2·d）；石臼湖夏季水位一般为7 m，当风速超过63 m/s时，国考断面TP超标风险显著上升。 |
| 英文摘要: |
| To address the issue of total phosphorus（TP） concentration exceeding the standard during low water level period of Shijiu Lake， a shallow lake connected to the Yangtze River， this study qualitatively analyzed the impact of wind on TP concentration exceeding the standard in the national monitoring sections in Shijiu Lake based on measured meteorological and water quality data， and quantitatively analyzed the influence of wind induced disturbances on TP release from sediments according to the static and dynamic release tests in the laboratory. The results showed that wind was the main reason for phosphorus release from sediments， which led to TP concentration exceeding the standard in the national monitoring sections during the low water level period of Shijiu Lake. The sediments in Shijiu Lake were characterized by low density， high proportion of organic matter， high phosphorus content（especially in granular form）， high proportion of silt， and were prone to suspension under the influence of wind. Under windless conditions， 〖JP2〗the adsorption release of phosphorus in sediments in Shijiu Lake could maintain a relatively stable 〖JP2〗equilibrium， with a release amount of ±2mg/（m2·d）.〖JP〗Wind induced disturbances could significantly 〖GK!87mm〗promote sediments resuspension and phosphorus release， with a release amount exceeding 15mg/（m2·d）. 〖JP3〗The water level of Shijiu Lake was generally 7 m in summer. When the wind speed exceeded 63 m/s， the risk of TP concentration exceeding the standard in national monitoring sections increased significantly. |
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