The study of hydraulic buffer zone and its applications
Date Issued
2009
Date
2009
Author(s)
Hung, Cheng-Yang
Abstract
In the numerical modeling of flows in oceans, estuaries, rivers or groundwater, the effect of abrupt changes in terrain usually causes numerical instability. In this work, numerical treatment using “hydraulic buffer zone” for solving such computational difficulty is proposed. Hydraulic buffer zone is set to be located at the area withbrupt changes in terrain, and decomposes the computational domain into two subregions. Direct simulation of the flow in the hydraulic buffer zone is ignored, and the connection of the regions divided by the buffer zone is performed using the condition of mass or energy conservation. Hydraulic buffer zone also can be applied to the connection of two computational regions with different spatial resolutions. n this research, the connecting schemes using hydraulic buffer zone in the modeling of groundwater flow and estuary hydrodynamics are developed. The kriging method is employed to interpolate/extrapolate the water head and water surface elevation across the buffer zone in the groundwater flow modeling and the estuary hydrodynamics modeling, respectively. At every time step, the iterative computations across the buffer zone are performed until the results of two successive iterations converge.o test the capability of hydraulic buffer zone, several calculations for simplified problems in groundwater and estuary hydrodynamics modeling are performed and reveal reasonable results, including irregular boundary shapes.pplications to the groundwater modeling in Zhuoshui river and the hydrodynamics modeling in the estuary of the Mei-Luan Creek are given. The results show that the treatment of hydraulic buffer zone is capability of handling the numerical instability caused by the abrupt changes in terrain and connecting two computational regions with different resolutions.
Subjects
Buffer zone
SDGs
Type
thesis
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