A forecasting system of water elevations around Taiwan： Studies on Numerical Modeling of Storm Surges and Grid Generation in CoastalWaters around Taiwan (III)
Date Issued
2004
Date
2004
Author(s)
蔡丁貴
DOI
922625Z002014
Abstract
1.Main program:
The object of this proposal is to form an integrated research group to make
efforts in establishing a forecasting system of water elevations around Taiwan. It
includes four components, namely, study of tidal prediction model on seas
surrounding Taiwan, numerical modeling of studies on storm surge in coastal waters
around Taiwan, numerical modeling of studies on grid generation technology in
coastal waters around Taiwan, and studies on an information system of coastal water
elevation around Taiwan. This integrated program is to be completed in period of
three years. The team of several researchers will devote themselves to the works of
numerical modeling, database establishment, and in-site investigations of coastal
water elevations around Taiwan. The final goal is the establishment of a predictive
and warning system for coastal floods around Taiwan.
This integrated project will make a selection of main regions suffered from
coastal flooding after water elevations around Taiwan are obtained. Common data
format, file system, and in-site field investigations is arranged throughout this
integrated research. Three to four progress meetings was conducted during the passed
research period to exchange research results and to share experiences in order to
achieve the goal of each individual sub-project.
The study results of this year include: (1) the harmonic constants associate with
the current ellipse of the principle constituents of semidiurnal tide are solved on coast
and seas around Taiwan, (2) solving singularity problem of BEM and the
establishment of the formulation for extending its application to multi-connected
regions, (3) the computing of astronomic tide and storm surge around Taiwan, (4) the
establishing of small-area (simple connected) boundary-fitted orthogonal grid system
and large-area (multiply-connected) boundary-fitted orthogonal grid system, (5)
completing the first-stage arrangement of Geographic Information System, and (6)
in-site data associated with the data analysis can be found in GIS.
2.Sub-program:
This study is a sub-study of the integrated research program “A forecastingsystem of water elevations around Taiwan”. The main purpose of this study is to
develop a new storm surge model by considering the local boundary effects. And the
success of this model is expected to reduce losses of life and property caused by storm
surges. The other purpose of this study is to establish and offer the boundary-fitted
orthogonal grid systems for another two sub-studies of this program.
The study first introduces the FEMA storm surge model developed by the
Federal Emergency Management Agency, U. S. A., and further improves the model
theoretically and numerically by replacing the original grid system with the
boundary-fitted grid system. Meanwhile, newer viewpoints about the singularity
problems in BIEM are discussed.
Finally, a new numerical scheme is established in this storm surge model to
improve the computational efficiency and stability.
In the first stage of the development of this new storm surge model, the principle
work is to improve the boundary-fitted coordinate system. In the second stage, the
main work is to combine the FEMAmodel with the orthogonal coordinate grid system.
In the last stage, variation of the astronomic tide will be included and the verifications
and validations of the new model with curvilinear coordinate system will be made.
The development of this model will meet the needs of the coastal storm surge
prediction, coastal river water level prediction, and coastal flooding prediction.
Moreover, this study can be taken as the base of the inundation prediction and
evacuation management system for coastal flooding areas of Taiwan. Also, the
development of this model can provide as guidelines of the setback line and flooding
insurance.
Subjects
Storm surge
Boundary-fitted orthogonal grids
Water level
Taiwan
Publisher
臺北市：國立臺灣大學土木工程學系暨研究所
Type
report
File(s)![Thumbnail Image]()
Loading...
Name
922625Z002014.pdf
Size
3.15 MB
Format
Adobe PDF
Checksum
(MD5):37a232146100834ab5308bcdacae5d71