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The Contrastive Study about the Transport Mechanism and the Characteristics of Water and Suspended Sediment of Flood and Ebb Channels in the Changjiang Estuary

Author: TangYuJie
Tutor: WangYongHong
School: Ocean University of China
Course: Marine Geology
Keywords: Yangtze Delta Ebb slot Water and sediment Transport mechanism Particle size distribution of suspended sediment
CLC: TV148
Type: Master's thesis
Year: 2008
Downloads: 107
Quote: 1
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Abstract


Estuary ebb tank water transport characteristics and sediment characteristics, as well as the transport mechanism is not only important estuarine dynamics, in practice the harbor site and the sea lanes governance has important significance. In this paper, Xinqiao Channel, the southern branch of the main channel on the rise, ebb slot as the research object, using the hydrodynamic characteristics of the hydrological statistics, dynamic analysis of their system, suspended sediment and water and sediment transport mechanisms. LIIST size distribution characteristics of the flood channels Xinqiao Channel up for further study, and particle size characteristics of the ebb slot basis. Temporal and spatial variation of water and sediment characteristics based on the April 2005 Dry Season the neap measured data analysis, combined with the already flood DRY SEASON information, research ebb slot trend. The results show that: the extremely complex hydrodynamic flood channels of the Yangtze River estuary. Hung dry season hydrological characteristics change not only exists, but also there is the wave of the size of the flood season and DRY SEASON neap tidal changes. With the changes in the hydrodynamic and suspended sediment of the ebb slots there are also significant differences. The maximum flow rate and average velocity of the flood tide high tide slot is always greater than the ebb flow rate, as well as greater than the the ebb the slot tide flow rate in the same section, the ebb slot is the opposite. The flood channels only DRY SEASON tide of performance to the obvious advantage of the high tide, high tide is greater than the ebb amount, when the flood season and DRY SEASON neap tide amount to less than the ebb amount. Flood channels the Euler residual current flood season the tide direction to the sea to the land, the flood season neap DRY SEASON. Hung DRY SEASON size tide during flood channels, the maximum high tide sediment concentration and the average high tide sediment concentration is greater than the ebb slot corresponding tide sediment concentration; DRY SEASON largest tidal ebb and average ebb sediment concentration tide ebb The groove is greater than the ebb slot, the neap tidal flood season when the opposite. Vertically, the ebb slot suspended sediment rose range is always kept in the lower, flood channels Hung Dry Season and neap tidal change occurs, remain in the lower tide when the flood season, flood season neap partly up to the upper, dry season neap tide when up to the upper part. The Xinqiao Channel upper always maintain high tide advantages sand unchanged, and the the the Dry Seasons tide advantages sand To big Yuhong quarter. Advection the sediment items in the ebb slot of the contribution to the total sediment must be greater than the value of the flood channels. Up, ebb slot source than the dry season are big Yuhong quarter. Tide when the flood season, flood channels advection sediment transport direction toward the sea to the land, the flood season neap DRY SEASON. Shinbashi watercourse lower portion from the surface to the bottom, with an average particle size, the median diameter are kept increasing trend. Surface suspended sediment in the average particle size is less than the underlying, recreation stream hanging Sand average particle size greater than rapids. On vertical distribution of particle concentration of suspended sediment and suspended sediment concentration along the vertical distribution pattern consistent. Particle size of suspended sediment silt, 69.5% of the average volume concentration of coarse particles.

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CLC: > Industrial Technology > Hydraulic Engineering > The basic science of water resources project > Sediment dynamics, River Dynamics > Estuaries,harbors,coastal sediment
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