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題 名 | Numerical Simulation of Circulation and Salinity Distribution in the Tanshui Estuary=淡水河口環流與鹽分分佈之數值模擬 |
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作 者 | 許銘熙; 郭義雄; 柳文成; 郭振泰; | 書刊名 | Proceedings of the National Science Council : Part A, Physical Science and Engineering |
卷 期 | 23:2 1999.03[民88.03] |
頁 次 | 頁259-273 |
分類號 | 443.64897 |
關鍵詞 | 淡水河口環流; 鹽分分佈; 數值模擬; Numerical model; Residual circulation; Salinity intrusion; Tanshui river system; |
語 文 | 英文(English) |
中文摘要 | 河口流況主要是受到潮汐,隨季節變化的河川流量及海水入侵之影響。本文發展 一適用於主、支流匯流河口之垂直二維數值模式。模式經建立後可用以模擬河口流況之時序 變化及鹽分分佈,並將模式應用於淡水河系,以現場實測資料,作為模式檢定與驗證之依據, 模擬與實測結果相當符合。本文主要強調模式的數值試驗與應用;模式經過檢定與驗證後,並 應用於淡水河口探討不同之水文狀況下,密度變化引起之環流、流速分佈與鹽分入侵等現象。 數值實驗結果顯示,於Q□低流量狀況下,如廢污水量完全截流時,河口中下游鹽分之增加 可高達2至4ppt,但是鹽分入侵極限並無顯著增加,因為它已受到上游高河床之限制。 |
英文摘要 | Flow conditions in an estuary are primarily influenced by tides, seasonally varying freshwater discharge and intrusion of salt water from the ocean. A laterally averaged two-dimensional numerical model is developed and expanded for an estuarine system with tributaries as well as a mainstream. A series of comprehensive field data is used for model calibration and verification. The model simulates the time varying flow and salinity distribution in the Tanshui estuary. Reasonable agreement is obtained between the model results and observed data. This paper focuses on model experiments and applications. The model is applied to investigate the estuarine circulation, residual velocity profiles and salinity distributions under various hydrological conditions in the Tanshui estuary. The numerical experiment results show that, under Q□ flow conditions, if the wastewater is totally cut-off by wastewater interception systems, the salinity will increase by 2 to 4 parts per thousand in the middle portion of the mainstream and lower portion of the tributaries. However, the limit of salt intrusion will change little since it is limited by the shallow depth in the upper estuary. |
本系統中英文摘要資訊取自各篇刊載內容。