Analysis of Base Flow in Reservoir Watersheds during Drought (I)

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Project title

Code/計畫編號

NSC92-2625-Z019-002

Translated Name/計畫中文名

乾旱期間水資源供需模式之研究---子計畫：乾旱期間水庫集水區基流量分析(I)

Project Coordinator/計畫主持人

Kwan-Tun Lee

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Harbor and River Engineering

Website

https://www.grb.gov.tw/search/planDetail?id=827276

Year

2003

Start date/計畫起

01-08-2003

Expected Completion/計畫迄

31-07-2004

Bugetid/研究經費

854千元

ResearchField/研究領域

土木水利工程

傳統水文學中對於基流量之推估，均是採用序率分析方式進行預測；亦即是藉由過去的水文紀錄資料，以分析未來可能發生的流量分佈情形。有鑑於近十年來全球氣候環境的變遷，因此早期水文紀錄資料所顯現的逕流特性，未必能夠涵蓋現在或未來即將發生的乾旱情形。所以本研究摒棄以往應用序率理論分析低水期流量之方式，而採用定率分析方式以建立集水區基流量分析模式。本年度之主要工作乃在應用部分集水面積觀念，配合研究集水區之地形與土壤特性，建立地形指數模式，以分析乾旱期間集水區之基流量。研究中以石門水庫集水區與橫溪集水區(非水庫集水區)為研究集水區，並應用數值高程模式分析集水區地文特性，而後採用地形指數模式理論以建立基流量分析模式。研究結果顯示，地形指數模式於橫溪集水區可獲致良好的模擬；而模式經乾、濕季修正後，配合集水區分區計算亦可於石門水庫集水區獲得不錯之模擬結果。本研究於未來研究中將以本年度之計畫成果為基礎，配合子計畫一所預測之乾旱降雨情形作為模式之輸入，而推估乾旱時期河川基流量之空間分佈，以作為子計畫三之後續分析，進而提供政府於乾旱時期水資源調配之有效方案。 In conventional hydrology, low-flow was usually analyzed by using stochastic models, which are based on historical records from watersheds for hydrologic predictions. However, research on globe climate change has demonstrated that hydrologic environment was different from that in before especially in the past ten years. Therefore, hydrologic analysis based on previous measured records may not be able to well represent the drought condition in the future. Consequently, the deterministic approach would be more adequate for low-flow simulation instead of using the historical-record-based stochastic model. In this year project, the TOPMODEL model, which is based on the partial contributing area concept, was established for low-flow simulation during drought in correspondence with the characteristics of watershed topography and soil condition in the study watersheds. The Shihmen Reservoir watershed and the Heng-Chi watershed were used for model verification. A digital elevation model was applied to analyze the geomorphic characteristics of the study watersheds. The results obtained by applying the TOPMODEL have shown in good agreement with recorders in the Heng-Chi watershed. Through calibrating model parameters in wet and dry seasons, and separating watershed into several subwatersheds, we could also obtain good simulation results in the Shihmen Reservoir watershed. Further research will be conducted to integrate the predicted rainfall data from the 1st subproject, and then to render the discharge simulation results to the 3rd subproject for drought index derivation. It is hope that the analytical results from this integrated project can provide valuable information to authority for water distribution during drought.

Keyword(s)

基流量分析
地形指數模式
數值高程模式
Base flow analysis
TOPMODEL
Digital elevation model

DSpace CRIS

Analysis of Base Flow in Reservoir Watersheds during Drought (I)

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