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引用本文:郑阳华,邹浩东,何强,李宏,张青,陈德敏,艾海男.水动力条件对沉积物-水界面氧通量的影响.湖泊科学,2018,30(6):1552-1559. DOI:10.18307/2018.0607
ZHENG Yanghua,ZOU Haodong,HE Qiang,LI Hong,ZHANG Qing,CHEN Demin,AI Hainan.Influence of hydrodynamic conditions on the oxygen flux of sediment-water interface. J. Lake Sci.2018,30(6):1552-1559. DOI:10.18307/2018.0607
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水动力条件对沉积物-水界面氧通量的影响
郑阳华1, 邹浩东2, 何强2, 李宏2, 张青3, 陈德敏4, 艾海男2
1.重庆市环境保护局, 重庆 401147;2.重庆大学三峡库区生态环境教育部重点实验室, 重庆 400044;3.长沙市规划设计院有限责任公司, 长沙 410000;4.重庆大学法学院, 重庆 400044
摘要:
氧环境决定了水体沉积物中各种生命所需元素的最终归趋,沉积物-水界面是水相与沉积物相氧传递的重要场所,而水动力条件是影响沉积物-水界面氧传递的重要因素.选择三峡库区一级支流御临河为研究对象,根据长年监测数据建立实验室模型,采用声学多普勒流速测试仪及微电极测试系统构建了非侵入式涡度相关测试系统,探究了不同水动力条件对沉积物-水界面氧通量的影响.结果表明:水体静止状态下沉积物-水界面溶解氧浓度随时间的增加而减少,非静止状态下随时间的增加而增加;沉积物-水界面氧通量随水体流速的增加而增加.根据氧通量求解对应流速下垂直涡动扩散系数并进行线性拟合,当水体流速为0.01~0.14 m/s时,垂直涡动扩散系数与水体流速的相关性最好,此时沉积物-水界面氧通量的传递以涡动扩散为主导.
关键词:  沉积物-水界面  涡度相关测试系统  水动力条件  氧通量  垂直涡动扩散系数  水体流速  御临河
DOI:10.18307/2018.0607
分类号:
基金项目:国家自然科学基金项目(51478061)资助.
Influence of hydrodynamic conditions on the oxygen flux of sediment-water interface
ZHENG Yanghua1, ZOU Haodong2, HE Qiang2, LI Hong2, ZHANG Qing3, CHEN Demin4, AI Hainan2
1.Chongqing Environmental Protection Bureau, Chongqing 401147, P. R. China;2.Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400044, P. R. China;3.Changsha Planning & Design Institute Co., Ltd., Changsha 410000, P. R. China;4.Law School, Chongqing University, Chongqing 400044, P. R. China
Abstract:
Oxygen determines the final ending of various nutrient elements in sediments, and the sediment-water interface(SWI) is an important place for the oxygen transferring between the water phase and the sediments. This paper choose the Yulin River, one tributary of the Three Gorges Reservoir area, as the research object. According to the long-term monitoring data, a laboratory simulation device was established to simulate the natural water environment, and a non-invasive eddy correlation test system was built to explore the different hydrodynamic conditions on the SWI oxygen flux. The results showed that the dissolved oxygen concentration of SWI decreased with the increase of time in the stationary state of the water body, and increased with the increase of time in the non-stationary state. The SWI oxygen flux increases with the water velocity. According to the oxygen flux, the coefficient of vertical eddy diffusion (Kv) was calculated and linearly fitted. When the water velocity was 0.01-0.14 m/s, the correlation of the value of Kv and the water velocity was the best, and the SWI oxygen flux was transferred driven by eddy diffusion.
Key words:  Sediment-water interface  eddy correlation test system  hydrodynamic condition  oxygen flux  coefficient of vertical eddy diffusion  water velocity  Yulin River
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