行政院國家科學委員會補助專題研究計畫成果報告:防洪示範區淹水境況模擬與決策支援系統之研究(二)─總計畫暨子計畫：基隆河流域水文環境評估及沿岸逕流量推測之研究(二)
Date Issued
2002
Date
2002
Author(s)
王如意
DOI
902625Z002010
Abstract
The objectives of this research project are aimed to study the hydrological characteristics and set up adequate rainfall-runoff model for estimating the runoff discharges along Keelung River for the application of flood mitigation in the project area. Due to rugged valley in its topography, meandering river course, steep slope and complicated tributaries, Keelung River flows into low-lying plain of Taipei Basin. Following the rapid economic development and booming business in recent decades, many residents populated increasingly along banks of Keelung River, great change in land use and high degree of hydrological impact by the urban development can be significantly seen as a result. Severe flood and inundation damages caused by storm or typhoon hitting occur in Keelung River every year.
This research, the sixth subtopic of the objective-oriented and integrated project entitled, ¡§Inundation Scenario Simulation and Decision Support System for Flood-Damage Mitigation in Pilot Areas,¡¨ is accordingly proposed to study the hydrological environment, execute the detailed analysis for the detenninistic rainfall-runoff process, set up the adequately hydrological models to simulate the flood behavior and finally adjust the design discharge for hydrological planning along Keelung River Basin. The results obtained in this study can provide No. 7 and 8 research projects of scenario simulation as the necessary input condition, also to No. 9 and 10 research projects of flood damage and decision support system as the essential information for application.
To begin with the research procedure, rainfall, flood records and the related data are proposed to collect, analyze and store in the appropriate data bank. Several field surveys to the project sites are expected to accomplish to understand the present status of watersheds along the banks of Keelung River. Frequency analyses of rainfall in Keelung River Basin are scheduled to finish, rainfall intensity-duration-frequency curves are drawn, and the adequate rainfall pattern can be formed. The adequacy of rainfall network is also investigated by Kriging approach. Furthermore, ARC/INFO analysis of Geographical Information System are applied for analysis the geomorphologic characteristics of river network and watershed topography of Keelung River Basin. Suitable cell structures of every tributary can thus be organized. Semi-spatial distributed with parallel typed reservoirs conceptual model is theoretically derived, model parameters are reasonably optimized, and the resulting flood hydrographs can be simulated for different design conditions. Moreover, the hydrological effects due to urban development along the project areas are analyzed as the functional relationship between the physical parameter and the land-use variation by applying the concept of instantaneous unit hydrograph. Finally, by considering different layout conditions of flood-mitigation plans, the design discharge for the important locations along Keelung River can be modified for the hydrological planning of the pilot area.
Subjects
Rainfall analysis
Runoff simulation
Network design
Urban development
Scenario simulation
Decision support system
Hydrological planning
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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