Numerical Study of Sediment Transport in the Coastal Region Near the Danshuei River

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基本資料

Project title

Code/計畫編號

NSC94-2611-M019-015

Translated Name/計畫中文名

淡水河口海域沉積物運送之數值研究

Project Coordinator/計畫主持人

Yao-Tsai Lo

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Marine Environmental Informatics

Website

https://www.grb.gov.tw/search/planDetail?id=1106771

Year

2005

Start date/計畫起

01-08-2005

Expected Completion/計畫迄

01-07-2006

Bugetid/研究經費

223千元

ResearchField/研究領域

海洋科學

"利用一個三維數值模式POM (Princeton Ocean Model)研究淡水河水舌。淡水河位於台灣本島北部，是全省第二大河川，其包含三個支流：新店溪、大漢溪、及基隆河。近年來，許多計劃執行研究淡水河水質惡化、污染的問題。先前的研究顯示，數值模式的結果與實際觀測結果有相當性的符合。例如，有一股密度較輕、鹽度較低的水團在河口附近形成。此水舌的結構受潮沙很大的影響，隨著潮沙的漲潮、退潮而在河口來回擺動。此外，模式結果顯示在滿潮或干潮時，在岬角的後方會有渦流的產生，這是因為受海岸摩擦力的結果。本研究計晝的主要目的在於利用數值模式，來探討淡水河水舌的形成與時間進化情形，水舌與潮汐的互相作用過程，以及預測河流注入海洋的懸浮物質的路徑及分布情形。期望特別針對以下幾個問題尋求解答：（1)河水與海水混合的過程為何? (2)潮汐所引發的殘餘流為何? (3)懸浮顆粒在空間與時間上的分布情形為何? (4)不同流量的河水注入，對於淡水河水舌的分布有何改變? (5)台北港的興建對於此近海海域的流況有何影響？" "A three-dimensional estuarine and coastal ocean circulation model, POM (Princeton Ocean Model), is applied to the study of the Danshuei river plume. The Danshuei River, located in the northern island, is the second largest estuary in Taiwan. It includes three tributaries: Hsin-Dien, Dai-Han and Keelung Rivers. Recently, many studies have been conducted on water quality of the Danshuei River because of serious river pollution problems, in which amount of sewage have been discharged from Taipei City for years. Previous studies showed that the model result is in a good agreement with observations. A bulge forms near the river mouth. The river plume is significantly modulated by tides, in which the brackish water is moved back and forth by tides. Also, the model indicates that the model indicates that a shading-eddy is generated behind a headland at the slack high water. The objective of this study is to study the formulation and evolution of the Danshuei River plume and its modulation with tides and prediction of the pathways of river-borne suspended materials on the shelf by means of an existing numerical model. Especially, we will search the answers for the following questions: (1) What are the mixing processes between riverine and oceanic waters? (2) What is the tide-induced residual current over the shelf? (3) What are the spatial and temporal distributions of river-borne suspended particles? (4) How is the Danshuei River plume affected by different river inflow? (5) What are the model-predicted circulation patterns in the coastal region with/without the Taipei Port?"

Keyword(s)

潮沙
殘餘流
數值模式
水舌
tide
residual current
numerical model
river plume

DSpace CRIS

Numerical Study of Sediment Transport in the Coastal Region Near the Danshuei River

基本資料

Description