Hydrodynamic Characteristics in a Valley Type Tributary Bay during the Raising and Falling Temperature Periods

Abstract:

The heat changes and distribution in water body provide one of the most important elements of structure influencing a host of chemical and biological processes. After the river-type reservoir was constructed, backwater entered into some tributaries, resulting in slow flow velocities in these tributaries. This paper made a reasonable description on the physical mechanism of hydrodynamic and water temperature distributions in a typical tributary bay, basing the hydrodynamic & water temperature coupled three-dimensional mathematical model. Through a large number of measured hydrologic, temperature and meteorological data, the paper simulated and obtained the hydrodynamic and water temperature distribution structure of the typical tributary bay and its evolution process, and described the hydrodynamic characteristics with precise values during the raising and falling temperature period; it is shown from the results that velocity vectors change displayed the water flow moved in a two-way circulation due to non-equilibrium warming and cooling on riverway cross-section, and the maximum flow velocity, turbulent kinetic energy and vorticity appeared on the surface water body, as well as wall near the tributary bay, and the turbulent kinetic energy is minimum on the center of tributary bay. The simulation experiment accurately captured the circulation phenomena caused by temperature difference, and proposed detailed distributions of flow field and related turbulent physical quantity, showed the strong coupling of flow field and temperature field change.

• Periodical: Applied Mechanics and Materials (Volumes 353-356)
• Pages: 2567-2571
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.353-356.2567
• Online since: August 2013
• Authors: Zhen Zhen Yu, Ling Ling Wang, Lei Zhang, Yu Xia Yang, Li Yan, Jian Jun Zhang, Yong Yang
• Keywords: Three-Dimensional Mathematical Model, Turbulence Kinetic Energy, Two-Way Circulation, Valley Type Tributary Bay, Velocity, Vorticity, Water Temperature

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