检索结果-南通市图书馆

SEDIMENT RESUSPENSION IN THE CHANGJIANG ESTUARY

在线全文

学校读者我要写书评

暂无评论

International Journal of Sediment research 1995年第1期 32-42页

作者： SHI Weirong 1 and li jiufa2( , institute of’ estuarine and coastal research, east china normal university shanghai,200062, china)( institute of estuarine and coastal research, east china normal university shanghai.200062. china)

ＳＥＤＩＭＥＮＴＲＥＳＵＳＰＥＮＳＩＯＮＩＮＴＨＥＣＨＡＮＧＪＩＡＮＧＥＳＴＵＡＲＹＳＨＩＷｅｉｒｏｎｇ１ａｎｄＬＩＪｉｕｆａ２Ａｂｓｔｒａｃｔ：Ａｓｐｅｃｉｆｉｃｖａｒｉａｔｉｏｎｐａｔｔｅｒｎｏｆｔｈｅｎｅａｒｂ... 详细信息

ＳＥＤＩＭＥＮＴＲＥＳＵＳＰＥＮＳＩＯＮＩＮＴＨＥＣＨＡＮＧＪＩＡＮＧＥＳＴＵＡＲＹＳＨＩＷｅｉｒｏｎｇ１ａｎｄＬＩＪｉｕｆａ２Ａｂｓｔｒａｃｔ：Ａｓｐｅｃｉｆｉｃｖａｒｉａｔｉｏｎｐａｔｔｅｒｎｏｆｔｈｅｎｅａｒｂｏｔｔｏｍｓｕｓｐｅｎｄｅｄｓｅｄ...

关键词： Tidal resuspension Turbidity maximum Sediment concentration Changjiang Estuary Diffusion

Distribution and fluxes of suspended sediments in the offshore waters of the Changjiang (Yangtze) Estuary

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2009年第4期28卷 86-95页

作者： WAN Xinning li jiufa SHEN Huanting State Key Laboratory of estuarine and coastal research East China Normal University Shanghai 200062 China shanghai Waterway Engineering Design and Consulting Co. LTD Shanghai 200120 China

The offshore waters of the Changjiang Estuary are the transitional areas where river-supplied water and sediment are transported to the sea, and material exchanges occur with the neighbored Hangzhou Bay and the Jiangsu waters. Field observations of currents and sediment properties were conducted to study temporal and spatial distributions of suspended sediments under various dynamical conditions. The high sediment concentrations were found to occur in the western and southern waters of the offshore, and the low concentrations occurred in the eastern and northern waters. This pattern of the suspended sediment concentration （SSC） distribution is obviously influ- enced by the runoff and tidal current. The significant difference of along-estuary SSC distribution indicates that the SSC is reduced gradually from the west to the east, and that in the spring tide is obviously higher than in the neap tide. The methods of mechanism analysis and equal-area grids were used to calculate the suspended sediment fluxes at the typical cross sections. It was found that 44 percent of total suspended sediments from the Changjiang River were deposited in the submarine delta, and more than 27 percent of sediments were transported southernly into the Hangzhou Bay, and only 9 percent of sediments was supplied and exchanged with the northern Jiangsu waters, and about 20 percent of sediments was delivered offshore to the sea.

关键词： Changjiang Estuary offshore waters suspended sediment distribution flux

The Bedload Movement in the Changjiang Estuary

在线全文

学校读者我要写书评

暂无评论

china Ocean Engineering 1993年第4期8卷 441-450页

作者： li jiufa, Shi Weirong, Shen Huanting Xu Haigen and Doeke Eisma Associate Professor, institute of estuarine & coastal research (1ECR), east china normal university, shanghai200062 Professor, IECR, east china normal university, shanghai 200062 Professor, Netherlands institute for Sea research, P. O. Box 59 1790 AB, Den Burg, Texel, The Netherlands institute of estuarine & coastal research (IECR) East China Normal University Shanghai 200062 China

Sandwaves in the Changjiang estuary were measured with a shallow sediment profiler and an echosounder from 1978 to 1988. The data, together with grain size and bedform of sediment indicates that the bedload movement by rolling and saltation is of great significance to sediment transport and is the principal factor responsible for sandwave and sandbody development in the estuary. The sandwaves were found well-developed, which is related to the tidal range and the velocity of ebb current. However, the further growth is restricted by strong flood current prevailing in the estuary. Because of the significant bedload, the sandbodies shift obviously and frequently, and sometimes the exchange of position occurs between the sandbodies and tidal channels. As a result, ships are regularly forced to change their navigation course.

关键词： Changjiang Estuary bed load sand ripple sediment

ON THE VERTICAL STRUCTURE OF TIDAL CURRENTS IN SHALLOWWATER NEAR THE CHANGJIANG RIVER ESTUARY

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Oceanology and limnology 1987年第1期5卷 22-33页

作者：李身铎 institute of estuarine and coastal research east china normal university shanghai

This research on the vertical structure of tidal current in shallow water near the Changjiang River estuary is based on a great deal of observation data of current obtained recently, and a simple mathematic model. The essential features of the structure are: （1） the maximum velocity decreases with depth, the shallower the water, the lower the velocity; （2） the orientation of maximum velocity continuously deviates from the surface to the bottom to the left at the western side of the mouth bar and to the right at the eastern side; （3） the time of maximum velocity leads steadily with depth; （4） in general, tidal currents rotate clockwise, the nearer the sea-bed, the narrower the ellipse of the tidal current; （5） the ratio W1/W2 varies non-linearly with depth, and is smaller in the middle layer than at the surface and bottom. Bottom friction is the main cause of the vertical structure.

关键词： ON THE VERTICAL STRUCTURE OF TIDAL CURRENTS IN SHALLOWWATER NEAR THE CHANGJIANG RIVER ESTUARY

THE TIDAL FLATS MORPHOLOGICAL DEVELOPMENT AND THE coastal LAND RECLAMATION IN shanghai

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Geographical Sciences 1996年第1期6卷 84-91页

作者： li jiufa(institute of Estuanne & coastal research, east china normal Univ., shanghai 200062People’s Republic of china)Zhang Chen(Nanjing institute of Geography and limnology, CAS, Nanjing 210008People’s Republic of china) Inst of estuarine + coastal Rsch East China Normal Univ Shanghai 200062 China

More than 904.2 km2 of the flats are above the theorotical datum level with progressive rate of 20-200 m/a to the sea in shanghai. Since the reclaimed land is vital important to the city, multiple approaches to accelerating siltation are proposed in the paper according to detailed study of dynamics, sedimentary structure and landform evolution based on plentiful in situ data. It is of great significance to utilize tidal flats and reclamation of land in shanghai.

关键词： Changjiang Estuary shanghai tidal flat reclamation

TRANSPORT OF THE SUSPENDED SEDIMENT IN THE CHANGJIANG ESTUARY

在线全文

学校读者我要写书评

暂无评论

International Journal of Sediment research 1992年第3期 45-63页

作者： SHEN Huanting institute of Esturaine and coastal research, east china normal university, shanghai, china li jiufa institute of Esturaine and coastal research, east china normal university, shanghai, china ZHU Huifang institute of Esturaine and coastal research, east china normal university, shanghai, china HAN Mingbao institute of Esturaine and coastal research, east china normal university, shanghai, china ZHOU Fugen Department of Marine Geology, Tongji Univcrsity, shanghai, china

The Changjiang River is characterized by the enormous volume of runoff and the great amount of sediment load with remarkable seasonal variation. The annual runoff sometimes is respondent to the amount of sediment load, and sometimes not. The amount of monthly sediment load after the month of the maximum runoff is larger than those before the month. The sediment concentration and net quantity of sediment transport in the vicinity of the river mouth varies greatly in time between the ebb and flood, spring and neap, and dry seasons and flood seasons. The three bifurcations also have differences in concentration and net quantity in space. Even in the same bifurcation they have differences in and out of the sand bar. At present, the North Channel is the main passage for water and sediment load emptying into the sea from the Changjiang River. More than 50 percent of the sediments from the river basin are deposited nearby the South Branch entrance and the main depositional area is situated in subaqueous delta off the South Channel. Between 122°30’E and 123°E is an important boundary for eastward sediment dispersion from which the suspended sediment are dispersed towards the east by south.

关键词： Changjiang Estuary Suspended sediment Sediment concentration Deposition Dispersion Sediment transport.

FIELD OBSERVATIONS ON BED SEDIMENTS AND SANDWAVES IN CHANGJIANG ESTUARY

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

International Journal of Sediment research 2005年第2期20卷 129-135页

作者： jiufa li1,Xinning WAN1,2,Ming YING3 and Xiaohua CHEN41 Prof.,3,4 Dr.,State Key Laboratory of estuarine and coastal research,east china normal university,shanghai 200062,china,2Dr.Engr.shanghai institute of Waterways,shanghai 200120,china State Key Laboratory of estuarine and coastal research East China Normal University Shanghai 200062 China State Key Laboratory of estuarine and coastal research East China Normal University Shanghai 200062 China State Key Laboratory of estuarine and coastal research East China Normal University Shanghai 200062 China

A series of advanced instruments were applied to obtain the field data of bed,bed forms and relevant dynamic factors in the 150 km-long reach of the Changjiang River from Jiangyin to Hengsha Island in March 2002. We found that well-sorted fine sand was in the majority of the bed sediment,which had a median diameter of 2 . Well-developed sandwaves were formed because the grains jumped together on the bed,which was related to the granularity and current velocity during the flood-ebb tidal cycles.

关键词： Changjiang estuary Sediment Bedload transport Granularity Sandwave

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

东海北部鱼类组成特征分析

水产学报 2004年第4期28卷 384-392页

作者：李圣法严利平李长松胡芬华东师范大学河口海岸国家重点实验室中国水产科学研究院东海水产研究所农业部海洋与河口渔业重点开放实验室中国水产科学研究院东海水产研究所农业部海洋与河口渔业重点开放实验室上海 200062 中国水产科学研究院东海水产研究所农业部海洋与河口渔业重点开放实验室上海 200090

利用1997-2000年东海北部(29°30′～33°00′N,122°30′～128°00′E)四个季节的底拖网调查资料,选取生物量占总生物量90％的前27种鱼类,运用聚类分析和多维标度分析法,研究了东海北部鱼类组成的空间格局特征。结果显示东海北部鱼类... 详细信息

利用1997-2000年东海北部(29°30′～33°00′N,122°30′～128°00′E)四个季节的底拖网调查资料,选取生物量占总生物量90％的前27种鱼类,运用聚类分析和多维标度分析法,研究了东海北部鱼类组成的空间格局特征。结果显示东海北部鱼类组成可分为三个群聚类型,即近海群聚、较深海域群聚和外海群聚。近海群聚的主要种类有凤鲚(Coilia mystus)、龙头鱼(Harpadon nehereus)、黄鲫(Setipinna taty)等;较深海域群聚的主要种类有鳀(Engraulis japonicus)、带鱼(Trichiurus japonicus)、日本鲭(Scomber japonicus)、鳄齿鱼(Champsodon capensis)、细条天竺鲷(Apogon lineatus)、发光鲷(Acropoma japonicum)等;而竹(竹夹)鱼(Trachurus japonicus)、星康吉鳗(Conger myriaster)、黄鲷(Taius tumifrons)、水珍鱼(Argentina kgoshimae)、日本海鲂(Zeus fober)、绿鳍马面鲀(Thamnaconus sepremtrionalis)等为外海群聚的主要种类。同时分析了水深、底层温度、底层盐度等环境因子与鱼类群聚的关系,表明影响鱼类群聚的主要环境因子有水深、底层盐度。不同群聚间的种类分布是重叠交错的,并没有明显的群聚边界,但密集分布海域各异,不同群聚的种类组成在不同季节具有一定的持续性,其种类组成保持了相对的稳定。

关键词：鱼类组成特征鱼类群聚东海北部环境因子聚类分析非线性多维标度分析

THREE METHODS FOR ESTIMATING TURBULENT STRESS AND DRAG COEFFICIENT IN TIDAL CURRENTS OF THE HANGZHOU BAY

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1987年第4期32卷 252-257页

作者：方国洪李身铎曹德明 institute of Occanology Academia SinicaQingdao estuarine and coastal Rcscarch institute East China Normal UniversityShanghai institute of Occanology Academia SinicaQingdaon this paper we employed three metbods for measuring and estimating the turbulent stress and the results obtained were in good agreement with each other. The first method is a direct application of the momentum equations the second one is based on the integration of momentum equations over an area by which an overall estimate of the stress term for the area can be obtained while the third one makes use of the energy equation and from which the estimate of the drag coefficient is deduced.

In this paper, we employed three metbods for measuring and estimating the turbulent stress and the results obtained were in good agreement with each other. The first method is a direct application of the momentum equations; the second one is based on the integration of momentum equations over an area, by which an overall estimate of the stress term for the area can be obtained; while the third one makes use of the energy equation and from which the estimate of the drag coefficient is deduced.

关键词： momentum turbulent deduced estimating tidal turbulence angular generating coordinates alignment