Impact of Water-Sediment Exchange on Underwater Terrain Shaping Process for a Tide-Influenced Waterfront Lake
Publication: Journal of Hydrologic Engineering
Volume 20, Issue 9
Abstract
This study selected a typical waterfront lake, the Inner Lake, as the research area. Based on field measurements and laboratory experiments, the basic properties of sediment particles were analyzed, including size, bulk and dry bulk density, and hydrostatic and hydrodynamic settling velocity. With the finite-volume method, the flux vector splitting (FVS) scheme was employed to establish a two-dimensional unsteady flow and sediment mathematical model. The underwater terrain shaping processes in the short term (2017), middle term (2020), and long term (2025) were predicted. The results showed that sediment deposition thickness will significantly increase in the Inner Lake, reaching 13.5 cm in the short term (January 2017), 28.6 cm in the middle term (January 2020), and 55.2 cm in the long term (January 2025). Owing to the strong hydrodynamic condition of the Leading Channel, sediment deposition there is the lowest, with the lake bed elevating rate at on average. The elevating rate at the northern bottomland and the southern bottomland is 54.3% higher than at the Leading Channel because of the reduction of sediment carrying capacity, and it is at a middle level at Jiaonan Gate because of the backwater effect of the tide. The average elevating rate of the whole lake is in the short term, in the middle term, and in the long term. The increase in average elevating rate indicates that sediment deposition will further affect hydrodynamic conditions and thereby accelerate the lake bed elevating process.
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Acknowledgments
This work was jointly supported by funds from the National Natural Science Foundation of China (No. 51309082) and the Major Science and Technology Program for Water Pollution Control and Treatment of China (Nos. 2012ZX07506-002 and 2012ZX07101-001).
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Published In
Journal of Hydrologic Engineering
Volume 20 • Issue 9 • September 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: May 9, 2014
Accepted: Nov 13, 2014
Published online: Dec 15, 2014
Discussion open until: May 15, 2015
Published in print: Sep 1, 2015
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