Topography-induced dynamic structure in the Pearl River：a case study in the Yamen outlet

LIU Huan; WU Jiaxue; WU Yaju

doi:10.3969/j.issn.0253-4193.2013.05.003

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LIU Huan, WU Jiaxue, WU Yaju. Topography-induced dynamic structure in the Pearl River：a case study in the Yamen outlet[J]. Haiyang Xuebao, 2013, 35(5): 29-36. doi: 10.3969/j.issn.0253-4193.2013.05.003

Citation:

LIU Huan, WU Jiaxue, WU Yaju. Topography-induced dynamic structure in the Pearl River：a case study in the Yamen outlet[J]. Haiyang Xuebao, 2013, 35(5): 29-36. doi: 10.3969/j.issn.0253-4193.2013.05.003

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Topography-induced dynamic structure in the Pearl River：a case study in the Yamen outlet

doi: 10.3969/j.issn.0253-4193.2013.05.003

1.
Research Center of Coastal Ocean Science and Technology, Sun Yat-sen University, Guangzhou 510275, China;School of Marine Science, Sun Yat-sen University, GuangZhou 510275, China
2.
Pearl River Hydraulic Research Institute, Guangzhou 510611, China

Received Date: 2012-12-10

Abstract

Abstract

The local topography plays a significant role in estuarine momentum balance, tidal energy balance, tidal properties and sediment transport. Taking the typical geomorphic unit in the Pearl River estuary named Yamen as an example, water level guaging and bottom-mounted tripod measurements were conducted to explore the dynamic structure induced by the topographic boundary. The results show that: (1) the narrowing of the cross-sections Yamen in area leads to a backwater in the opposite-flow direction, increaseing the water level gradient in the down-flow direction. (2) The baratropic force induced by the water level gradient is a primary term in the momentum equation. The depth-averaged along-channel momentum balance is achieved between baratropic force and advection during the peak tide, and between baratropic force and local acceleration during the slack tide. (3) The form drag induced by topographic features is several times to one order in magnitude larger than the skin drag caused by bed roughness.
- topographic boundary,
- dynamic structure,
- momentum balance,
- Pearl River Estuary

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References(22)

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