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  4. Applying Hilbert-Huang Transform to handle terrain data for simulation of flood inundation
 
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Applying Hilbert-Huang Transform to handle terrain data for simulation of flood inundation

Date Issued
2008
Date
2008
Author(s)
Chien, Chin
URI
http://ntur.lib.ntu.edu.tw//handle/246246/187646
Abstract
Since shallow water computation can not tolerate rapid terrain variation without divergence, the conventional hydrodynamic simulation can not handle problems with complicate terrain and buildings. Therefore, only large scaled, mild variation terrain is considered in conventional hydrodynamic simulation. However, due to the fact that survey technology has improved a lot recently, both urban and suburban terrains can be measured accurately either by aircraft or satellite, hydrodynamic simulation should improve accordingly. Because Hilbert-Huang Transform(HHT)can follow the smoothness of a rapidly varied curve to obtain intrinsic model functions layer by layer, we therefore can use HHT to handle complicated terrain data according to its roughness and hopefully to achieve the balance point of computation model tolerance and terrain complication degree. Under the constraint of Taiwan’s terrain and climate, inappropriate land usage and drainage system are easy to result in flood. Hence this research aims on the balance point of computation model tolerance and terrain complicated degree by observing the result of flood inundation simulation. The present study just applies the aforementioned HHT to handle urban and suburban terrain data and uses HHM to carry out the flood inundation simulation in order to achieve the balance point of computation model tolerance and terrain complicated degree. Comparing the simulation result of the present study to that of the conventional flood inundation simulation without complicated terrain the present study is indeed realistic.he present study provides a revolutionary measure to solve the problem induced by urban and suburban terrain complication degree and computation model tolerance of hydrodynamic simulation. It can serve as reference for future improvement of hydrodynamic simulation.
Subjects
Hilbert-Huang Transform
horizontal two dimensional hydrodynamic model
urban terrain
suburban terrain
flood inundation model
Type
thesis
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