Author(s): Masakazu Aoki
Linked Author(s):
Keywords: Rod float observation; Modification; Water surface gradient; 2 dimensional numerical analysis on unsteady flow; Finite element method
Abstract: In flood case, discharge observation is used to by rod float getting out of hazard conditions. But the observation method used by rod float is not based on hydraulic theory, just only integration of velocity and cross sectional area. This method is seldom to get correct data, because a few rod floats on complicated flow and rude cross section leveling. That why, it is important to be modified a correction of discharge observation data. The method of correction is hydraulic way by water surface gradient. After the correction, the confirmation (inspection) survey whether modified discharge data are correct or not to be used by the method of 2 dimensional numerical analysis on unsteady flow. This 2 dimensional numerical analysis is given modified discharge data as boundary condition of upstream, and given observed water level as boundary condition of downstream. If resolution of this analysis could be able to calculated almost same water level with anther observation water level. (middle stream gauge), given modified discharge data are correct. In other words, it is inspection to be corresponded with observation data and calculate water level by 2 dimensional numerical analysis to be used modified discharge data for boundary conditions. It was convinced that observation discharge data were needed to modify corrections.
Year: 2005