IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 6 - MARITIME HYDRAULICS AND COASTAL ENGINEERING : The Seasonal Characteristic of Pulsatileflow Field and Topography Change in the Estuarine Channel of...
The Seasonal Characteristic of Pulsatileflow Field and Topography Change in the Estuarine Channel of the Yangtze River
Author : Zhangjiao Wang, Tadaharu ISHIKAWA and Ryosuke AKOH
The flow field in the Yangtze estuarine channel is highly pulsatilethroughout the year, because of its mild channel slope and large tidal amplitude. This paper compares the different tendency of topography change in flood season and dry season by using numerical simulation. The shallow water equations on the base of unstructured triangular mesh system are applied to calculate the flow field. The Laursen?sformula on bed sediment load is used to evaluate the topography change. The calculations result shows highly pulsatile sediment transport in thalweg and remarkable cross-sectional flow above the underwater shoals in both seasons. In dry season, due to the stronger landward transport, sandspits develops at the edge of underwater shoals. This small scale topography feature further develops in the next flood season and changes the flow field entirely. Considering the large sediment transport rate, the topography outline is formed in flood season. However, the small scale sandspit might be a key point to the topography change in the Yangtze Estuarine channel.
File Size : 1,741,052 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Article : THEME 6 - MARITIME HYDRAULICS AND COASTAL ENGINEERING
Date Published : 18/07/2016
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