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| Causes of distribution characteristic of flushing time of Xiangxi bay in autumn |
| ZHANG Hongqing1,2, DAI Huichao3, BAO Zhongjin1, WANG Bin1, WANG Ziming1 |
| 1. Zhejiang Institute of Hydraulics & Estuary, Hangzhou, Zhejiang 310020, China; 2. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, Zhejiang 310058, China; 3. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, Jiangsu 210098, China |
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Abstract For the problem of algal bloom of tributaries of the Three Gorges Reservoir in autumn, 3D hydrodynamic model, based on the background of the Xiangxi River was set up to explore the flushing time distribution and its causes during Sep.1 to Nov.30. Results show that in the storage period of the Three Gorges Reservoir, the areas of longer flushing time mainly focus on the middle of tributary embayment of the Xiangxi River, and the maximum of flushing time at every layer of tributary embayment increases as the water level rises at the end of flood season; in the following middle and lower area of tributary embayment, flushing time of the surface layer is the longest owing to trunk stream decanted into the tributary embayment from the middle and bottom layers, and the difference of flushing time between the surface and middle and bottom layers nearby tributary embayment estuary increases with the duration of trunk stream intrusion increasing. In the upstream and middle and upper areas, the flow direction is from the bottom of the tributary embayment to trunk stream within most of the time of this period, so flushing time at the bottom of this area is shorter than that at the surface and middle layers. The results can provide a reference for preventing and controlling the fall blooms problems of tributaries embayment of the Three Gorges Reservoir.
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Received: 13 November 2015
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| [1]杨正健,刘德富,纪道斌,等. 三峡水库172.5 m蓄水过程对香溪河库湾水体富营养化的影响[J]. 中国科学(技术科学), 2010,40(4): 358-369. YANG Zhengjian, LIU Defu, JI Daobin, et al. Influence of the impounding process of the Three Gorges Re-servoir up to water level 172.5 m on water eutrophication in the Xiangxi bay[J]. Scientia sinica(technologica), 2010,40(4):358-369.(in Chinese)[2]练继建, 姚烨, 马超. 香溪河春季突发水华事件的应急调度策略[J]. 天津大学学报(自然科学与工程技术版), 2013,46(4):291-297. LIAN Jijian, YAO Ye, MA Chao. Emergency regulation strategy for sudden algal bloom accidents of Xiangxi Ri-ver in spring[J]. Journal of Tianjin University(science and technology), 2013,46(4):291-297.(in Chinese)[3]廖文根. 水动力调控:抑制三峡库区支流水华的路径[J]. 中国三峡建设, 2008(9):60-63.LIAO Wengen. Hydrodynamic regulation: inhibition of the Three Gorges Reservoir tributaries blooms path[J]. China Three Gorges construction, 2008(9):60-63.(in Chinese)[4]王玲玲, 戴会超, 蔡庆华. 河道型水库支流库湾富营养化数值模拟研究[J]. 四川大学学报(工程科学版), 2009,41(2): 18-23. WANG Lingling, DAI Huichao, CAI Qinghua. Simulation of eutrophication in branch of channel type reservoirs[J]. Journal of Sichuan University(engineering science edition), 2009,41(2):18-23.(in Chinese)[5]周建军. 优化调度改善三峡水库生态环境[J]. 科技导报, 2008, 26(7): 64-71. ZHOU Jianjun. Improvement of eco-environmental conditions of Three Gorges Reservoir by optimal operations[J]. Science & technology review, 2008, 26(7): 64-71.(in Chinese)[6]纪道斌,刘德富,杨正健,等. 汛末蓄水期香溪河库湾倒灌异重流现象及其对水华的影响[J]. 水利学报, 2010,41(6): 691-696,702. JI Daobin, LIU Defu, YANG Zhengjian, et al. Adverse slope density flow and its ecological effect on the algae bloom in Xiangxi bay of TGR during the reservoir impounding at the end of flood season[J]. Journal of hydraulic engineering, 2010,41(6):691-696,702.(in Chinese)[7]马超, 练继建. 人控调度方案对库区支流水动力和水质的影响机制初探[J]. 天津大学学报, 2011, 44(3):202-209. MA Chao, LIAN Jijian. Preliminary research on influence mechanism of human controlled dispatching solutions to hydrodynamics and water quality of tributaries of reservoir[J]. Journal of Tianjin University, 2011,44(3):202-209.(in Chinese)[8]MAO Jingqiao, WONG K T M, LEE J H W, et al. Ti-dal flushing time of marine fish culture zones in Hong Kong[J]. China ocean engineering, 2011,25(4):625-643.[9]SÁMANO M L, BÁRCENA J F, GARCíA A, et al. Flushing time as a descriptor for heavily modified water bodies classification and management: application to the Huelva Harbour[J]. Journal of environmental management, 2012,107: 37-44.[10]BÁRCENA J F, GARCÍA A, GÓMEZ A G, et al. Spatial and temporal flushing time approach in estuaries influenced by river and tide:an application in Suances Estuary(Northern Spain)[J]. Estuarine, coastal and shelf science, 2012,112: 40-51.[11]PHELPS J J C, POLTON J A, SOUZA A J, et al. Hydrodynamic timescales in a hyper-tidal region of freshwater influence[J]. Continental shelf research, 2013,63: 13-22.[12]CHOI K W, LEE J H W. Numerical determination of flushing time for stratified water bodies[J]. Journal of marine systems, 2004,50(3/4): 263-281.[13]GRIFOLL M, DEL CAMPO A, ESPINO M, et al. Water renewal and risk assessment of water pollution in semi-enclosed domains: application to Bilbao Harbour(Bay of Biscay)[J]. Journal of marine systems, 2013, 109/110: S241-S251.[14]WANG Guizhi, WANG Zhangyong, ZHAI Weidong, et al. Net subterranean estuarine export fluxes of dissolved inorganic C, N, P, Si, and total alkalinity into the Jiulong River estuary, China[J]. Geochimica et cosmochimica acta, 2015,149: 103-114.[15]ZHU Hongjun, HAN Qinghua, WANG Jian, et al. Numerical investigation of the process and flow erosion of flushing oil tank with nitrogen[J]. Powder technology, 2015,275: 12-24.[16]GUO Qizhong, LORDI G P. Method for quantifying freshwater input and flushing time in estuaries[J]. Journal of environmental engineering, 2000,126(7): 675-683.[17]蒋定国, 戴会超, 刘伟. 温度异重流作用下三峡香溪河库湾春季营养盐时空分布特征研究[J]. 应用基础与工程科学学报, 2013,21(1):20-31. JIANG Dingguo, DAI Huichao, LIU Wei. Temporal and spatial distributions of nutrients in Xiangxi Bay of the Three Gorges Reservoir under the influence of temperature density current[J]. Journal of basic science and engineering, 2013,21(1):20-31.(in Chinese) |
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