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Denitrification in Chongming east tidal flat sediment, Yangtze estuary, China

Science China Earth Sciences 2006年第10期49卷 1090-1097页

作者： WANG Dongqi1,2. CHEN Zhenlou1,3, XU Shiyuan1,2. HU Lingzhen1 & WANG Jun1,2.1. College of Resources & Environment, east China normal {2., shanghai 2.0062. China 2. state key laboratory of estuarine and coastal sediment dynamics and morphodynamics, east China normal {2., shanghai 2.0062. China 3. key {12. of Geographical Information Science of Ministry of Education,east China normal {2.,shanghai 2.0062. China 1. College of Resources & Environment East China Normal University Shanghai 200062 China 2. state key laboratory of estuarine and coastal sediment dynamics and morphodynamics East China Normal University Shanghai 200062 China 3. key laboratory of Geographical Information Science of Ministry of Education East China Normal University Shanghai 200062 China

From July 2.03 to July 2.04, samples were collected on Chongming Island east tidal flat every two months. The research showed that the nitrous oxide (N2.) production rate was very low in the water, Chongming east tidal flat (CM) {2. was the N2. source of the water. {2. N2. natural production rate was between -0.08 and 1.74 μmolN·m-2.h-1. N2. natural production rate was higher in the summer. The difference of the N2. natural production rate in the different tidal flats, the correlation between the N2. natural production rate and the denitrification rate, and those with the temperature and DO indicate that middle tidal flat {2. denitrification was the main process of the N2. production, while in the low tidal flat {2., the production of the N2. came from several processes of the nitrogen cycling. Tidal flat {2. denitrification reaction was stronger in summer and winter but relatively lower in the late autumn and early spring. Seasonal change of the {2. denitrification rate was wide, from 1.12.to 33.34 μmolN·m-2.h-1. Temperature, DO and the coactions of them had the prominent effect on the tidal flat {2. denitrification.

关键词： Yangtze estuary, tidal flat sediment, denitrification, nitrous oxide, effect factor.

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近岸波浪破碎方向谱模型

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天津大学学报（自然科学与工程技术版） 2001年第5期34卷 628-632页

作者：赵子丹刘百桥天津大学建筑工程学院

在线性海浪方向谱折绕射联合模型基础上 ,通过引入破碎波高概率分布和单个破碎波的处理方法 ,提出了在能量控制上与我国港口工程规范基本等效的近岸波浪破碎方向谱模型 ,使海浪方向谱折绕射联合模型的适用范围拓展到了破碎带内 .模拟地... 详细信息

在线性海浪方向谱折绕射联合模型基础上 ,通过引入破碎波高概率分布和单个破碎波的处理方法 ,提出了在能量控制上与我国港口工程规范基本等效的近岸波浪破碎方向谱模型 ,使海浪方向谱折绕射联合模型的适用范围拓展到了破碎带内 .模拟地形上的数值计算实验表明 ,该模型既能从宏观上较好地控制破碎波的沿程能量变化 ,又能通过波浪的内在结构反映近岸波浪的变形特征 .

关键词：近岸波浪破碎波高概率分布方向谱折绕射联合模型海洋工程破碎带

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DRY-SEASON VARIABILITY IN SUSPENDED sediment CONCENTRATIONS IN THE SOUTH PASSAGE OF THE CHANGJIANG ESTUARY

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International Journal of sediment Research 2007年第3期22卷 199-207页

作者： Wenxiang ZHANG1, Shilun YANG2. Jun ZHU3, Shiliang GONG4, and Pingxing DING2.1 Dr., Instructor, 2.Dr., Prof., 4 Ph.D. Candidate, state key Lab of {2. & coastal Research, east China normal university, Zhongshan N. Rd., 3663, shanghai 2.0062. China. 3 Ph.D. Candidate, Department of Environmental, coastal and Ocean Science, university of Massachusetts, Boston, MA 02.2.-3393, USA E China normal Univ State Key Lab Estuarine & Coastal Res Shanghai 200062 Peoples R China Univ Massachusetts Dept Environm Coastal & Ocean Sci Boston MA 02125 USA

This paper reports the results of continuous monitoring of turbidity, water depth, salinity (using an Optical Backscatter Sensor (OBS)), and current velocity (using a Current meter (SLC9-2.) in the South Passage of the Changjiang Estuary over a spring–neap period in February 2.03 (dry season). The turbidity measured via OBS was closely correlated with the suspended sediment concentration (SSC), which was highly variable. Over the study period, the SSC in the middle layer ranged from 110 to 1400 mg/l. The minimum SSC occurred during a late ebb tide, and the maximum SSC occurred during a late flood tide. On average, the SSC was 1.5 times higher during flood tide than during ebb tide. Vertically within the water column, SSC increased downward, with the ratio of SSC measured near the bed to that measured at the surface ranging from 1.90 to 18.3. The temporal variability in SSC is jointly governed by tides and wind-induced waves, whereas the vertical variability in SSC is attributed to the effect of gravity and vertical water circulation.

关键词： Suspended sediment concentration (SSC) Optical Backscatter Sensor (OBS) sediment dynamics Changjiang Estuary

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Temporal and spatial changes of suspended sediment concentration and resuspension in the Yangtze River estuary

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Journal of Geographical Sciences 2003年第4期13卷 498-506页

作者： CHEN Shenliang, ZHANG Guoan, YANG Shilun(state key {2. of estuarine and coastal Research, east China normal university,shanghai 2.0062. China) state key {2. of estuarine and coastal Research East China Normal University Shanghai China

A detailed analysis of suspended sediment concentration (SSC) variations over a year period is presented using the data from 8 stations in the Yangtze River estuary and its adjacent waters, together with a discussion of the hydrodynamic regimes of the estuary. Spatially, the SSC from Xuliujing downwards to Hangzhou Bay increases almost constantly, and the suspended sediment in the inner estuary shows higher concentration in summer than in winter, while in the outer estuary it shows higher concentration in winter than in summer, and the magnitude is greater in the outer estuary than in the inner estuary, greater in the Hangzhou Bay than in the Yangtze River estuary. The sediments discharged by the Yangtze River into the sea are resuspended by marine dynamics included tidal currents and wind waves. Temporally, the SSC shows a pronounced neap-spring tidal cycle and seasonal variations. Furthermore, through the analysis of dynamic mechanism, it is concluded that wave and tidal current are two predominant factors of sediment resuspension and control the distribution and changes of SSC, in which tidal currents control neap-spring tidal cycles, and wind waves control seasonal variations. The ratio between river discharge and marine dynamics controls spatial distribution of SSC.

关键词： suspended sediment concentration temporal and spatial changes sediment resuspension Yangtze River estuary

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长江口南汇边滩的演变及其沉积动力机制

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上海地质 2003年第4期 1-4页

作者：陈沈良张国安谷国传华东师范大学河口海岸国家重点实验室上海200062

南汇边滩是长江口、杭州湾以及外海三者交互作用的特殊地带。根据不同时期海图对比分析发现 ,南汇边滩北冲南淤 ,逐渐向东南方向伸展 ,平均速率为 30m/a。通过初步的机制探讨认为 ,南汇边滩有径流输沙和涨潮回输泥沙的双重补给 ,加上适... 详细信息

南汇边滩是长江口、杭州湾以及外海三者交互作用的特殊地带。根据不同时期海图对比分析发现 ,南汇边滩北冲南淤 ,逐渐向东南方向伸展 ,平均速率为 30m/a。通过初步的机制探讨认为 ,南汇边滩有径流输沙和涨潮回输泥沙的双重补给 ,加上适宜盐度的絮凝 ,沉积速率较大 ,在滩面淤高的同时向水平方向扩展 ,但北侧受南槽落潮水流南偏的作用而不断冲刷 ,东侧突出的沙嘴受外海风浪的强烈作用难以东扩 ,南侧受杭州湾口近东西向的涨落潮流作用 ,在这些动力泥沙的综合作用下。

关键词：南汇边滩冲淤演变沉积动力机制

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