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題 名 | 有限體積模式分析大肚溪河口濕地非恆定水流=Finite Volume Model for Unsteady Flow in the Estuarine Wetland of Tatu Creek |
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作 者 | 陳樹群; 何智武; 林震哲; | 書刊名 | 農業工程學報 |
卷 期 | 44:2 1998.06[民87.06] |
頁 次 | 頁77-86 |
分類號 | 443.046 |
關鍵詞 | 有限體積法; 大肚溪; 感潮濕地; 不規則網格; Finite volume method; Tatu creek; Estuarine wetland; Unstructured grids; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究主要目的在利用有限體積法建立二維變量流模式,並配合不規則網格來模 擬大肚溪河口及感潮濕地系統。模式主要特色在於使用積分法則來離散微分方程組,並以高 精度之Osher數值方法通過黎曼問題的近似解來估算各網格邊界上之水量及動量通量。本模 式可用於處理流域集水區內之(1)洪氾平原及濕地的漸乾及漸濕過程;(2)潰壩所產生的不連 續性震波;(3)可同時用於計算亞臨界流與超臨界流;(4)其他如主支流會合、水流流經堰壩 涵管橋墩等水工結構物之水理演算等。大肚溪河口及感潮濕地在常流量及暴雨洪流下之水位 高程變動情形,可配合大肚溪河道大斷面資料求得之曼寧n值來模擬水位高程,其與實測結 果甚為符合。顯示二維有限體積法所建立之變量流模式,對河口濕地漸乾及漸濕過程具有模 擬上之優越性。 |
英文摘要 | The purpose of this paper presents a two-dimensional unsteady flow model based on the finite volume method with a combination of unstructured triangular and quadrilateral grids in Tatu Creek and estuarine wetland system. One of the attractive features of this model is to treat the calculation of the mass and momentum flux across each side of elements as a Riemann problem which is solved using the Osher scheme. This feature enables this model to deal with: (1)the wetting and drying processes for floodplain and wetland studies, (2)the dam-break phenomena involving discontinuous flows, (3) the subcritical and supercritical flows, and (4) other cases, such as computations of tributary inflows and regulated flows through gates, weirs and culverts or bridges. Irrespective of normal discharge and flood flow of Tatu Creek, the results of the numerical model and field observations showed that the results were fairly close to each other. From the result, the FVM model can be gnerally suitable for complicated basin topography, therefore, it can be regarded as a useful tool for the wetting and drying processes of estuarian wetland studies. |
本系統中英文摘要資訊取自各篇刊載內容。