淹水模式基本數值地理資訊系統之建立(II)
Date Issued
2000
Date
2000
Author(s)
DOI
892625Z002008
Abstract
Every year flood during typhoon attack often causes serious damage to Taiwan. To mitigate flood disaster, sophisticated technology such as flood forecast, inundation simulation, hydraulic routing has to be implemented on river basin basis. Also a complete array of geographic, such as digital elevation model, land use, drainage and traffic network, and social-economic data have to be compiled into a complete and working data system to support the inundation model for better decision in flood disaster mitigation.
There are a lot of information gathered by government officials and private firms for better decision making. Some of the information have spatial distributed characteristics and can not be handled by alphanumeric database system efficiently. Maps are traditional way for handling these spatially distributed information. Paper maps are not easy to use and are difficult to update. Maps with different scales can not be overlaid for spatial analysis. Geographic Information System (GIS) is an efficient tool for management and analysis of these spatial data. It combines the attribute database and graphic data to form geographic database. With its spatial analytical ability, useful information for decision support can be extracted.
Vital data for flood disaster mitigation are somehow gathered but are scattered around different organizations and firms. Format and precision are different, and data may be incomplete in the upstream area. This jointed project is to gathers all the related information and integrate them into a working system for better flood control and damage mitigation.
The project is separated into three major portions: the first one for transportation network, social and economical data collection, the second one for digital terrain and watershed characteristics, the last one for land use analysis. All the geographic data are integrated into a geographic information system. For the first face of the project, the major road network has been built for the whole island. Social and economical data including population, building types, industrial and commercial activities are collected and associated with the map layer at village level. The digital terrain analysis results show that the correlation of the average slope for different order channels and overland areas is explicit. Linear relationships are shown in the stream order to the logarithmic values for different orders of stream number, channel slope, channel length, and contributing area. Consequently, the Horton¡¦s stream order law
can be adequately applied in the study area.
Subjects
Geographic Information
Disaster mitigation
GIS
Decision support
digital topography
stream network
watershed geomorphic parameters
land use
remote sensing
SDGs
Publisher
臺北市：國立臺灣大學生物環境系統工程學系暨研究所
Type
report
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