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 7 - WATER RESOURCES AND HYDROINFORMATICS : Efficient Algorithm for Watershed Overland Flow Simulations
Efficient Algorithm for Watershed Overland Flow Simulations
Author : Pin-Chun Huang and Kwan Tun Lee
Digital elevation model (DEM) is used to represent watershed topographic features in a raster or a vector data format, which has widely been linked with flow routing equations for watershed runoff modeling. In this study, a recursive formulation was encoded into each computational time step to permit a larger time increment in performing the kinematic-wave and diffusion-wave routing algorithms. To suit for the requirement of performing the recursive formulation, a novel routing sequence was developed to determine the cell-to-cell computational procedure in connection with the DEM database, in which the routing sequence can be set to follow either the grid elevation in a descendant order for the kinematic-wave routing or the water stage in a descendant order for the diffusion-wave routing. The proposed novel routing sequence was applied to a mountain watershed to show the computational efficiency. The result shows that the efficiency of the proposed algorithm was significant suppress than that of the conventional numerical algorithm especially for steep watersheds, in which the computing time was only one fifteenth in comparison with the conventional numerical method.
File Size : 1,091,903 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Date Published : 19/07/2016
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