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🏛️國立陽明交通大學機構典藏

Subject: search.filters.subject.Sediment transport

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    Monitoring of Sediment Transport in a Reservoir using Time Domain Reflectometry
    (2013-01-01)
    Chung, Chih-Chung
    ;
    Lin, Chih-Ping
    ;
    Wu, Po-Lin
    ;
    Hsieh, Sheau-Ling
    ;
    Wu, Ching-Hsien
    Due to geological weathering and climate change, soil erosion in watershed is becoming a serious problem in Taiwan. Large amount of sediment transports to reservoirs during typhoon events and affects the water quality. Density currents in reservoirs have high sediment concentration. The accumulated sediments have significantly reduced the reservoir capacity. Monitoring of sediment transport in a reservoir plays an important role in reservoir management. The existing techniques for suspended sediment concentration (SSC) monitoring, such as optical and acoustic methods, are sensitive to particle size or limited in measurement range. Furthermore, these techniques may not be cost effective for field monitoring due to the required maintenance and spatial coverage. A new technique based on time domain reflectometry (TDR) was recently introduced. It possesses several advantages including particle-size independence, low-cost transducers, durability, and cost-effective multiplexing. This study modified the TDR technique for better field applicability and demonstrated how it can be deployed as a full monitoring program for reservoir management through a case study in the Shihmen reservoir, Taiwan. Monitoring stations at upstream riverbank and outflow channels were installed with fixed protective structures to provide inflow and outflow sediment-discharge records. To capture the characteristics of density currents, multi-depth monitoring stations were designed and deployed on floats in the reservoir. Some of the data collected during Typhoon Fung-Wong are presented as an example to demonstrate the effectiveness and benefits of the monitoring station.
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    土石流堆積及下游河道發展段模式之研究(II)
    (1994)
    葉克家
    ;
    KEH-CHIAYEH
    ;
    國立交通大學土木工程學系
    本計畫係延續去年(81年8月)國科會補助計畫 編號為NSC82-0414-P-009-003-B「土石流堆積模式之 研究」之第二年研究,全程計畫原擬三年完成: 另楊錦釧教授去年接受國科會補助計畫編號 NSC82-0414-P-009-002-B「土石流河道發展段之數值 模擬(□)」之第二年計畫,按原先之構想於今年 合併,以便對土石流堆積後再轉為河道輸砂問 題作一整體性之考慮.本計畫將略述此二計畫 第一年之進度及部分成果,並詳述第二年計畫合後之工作內容及研究方法.此外,因限於經費 及避免重複投資於儀器設備,擬暫停本計畫第 三年之試驗工作,而於日後擇期再另提試驗研 究計畫.
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    河川空間利用之研究---子計畫六：蜿蜒河道有限解析法動床模式之研發及應用(I)
    (1995)
    葉克家
    ;
    KEH-CHIAYEH
    ;
    國立交通大學土木工程學系
    河道依其型態可分為蜿蜒、平直及辮狀等 三種,而以前者為最常見.蜿蜒河川之演變可分 沿主流方向河床之變化及側向之遷移與河寬之 變化二種,但二者相互影響,而為一極複雜之問 題.從水利工程之時間尺度而言,常將河川側向 之變化予以忽略,在尚符合規劃設計需要之原 則下,以簡化分析之困難度.故本研究基於實用 性之考慮,暫不探討河川側向之變化.本研究計 畫為"河川空間利用之研究"整合型計畫下之一 子計畫,依據分工原則,本研究之任務為發展一 套二維度蜿蜒河道動床數值模式,以模擬高水 設計流量時之床形及水位,並以曾文溪中下游 河段為應用對象,其成果將可供有關單位規劃設計之參考.本研究之特點為:(1)發展較先進之 正交貼壁座標系統,以描述河寬及河道沿程曲 率半徑變化之事實;(2)引介有限解析法,此一方 法有別於習見之有限差分法或有限元差法,該 法原應用在流力問題上且成果甚佳;(3)深入探 討二次流機制,以期合理模擬蜿蜒河道凹凸岸 處局部明顯沖淤之現象.根據上述之構想,本計 畫將循序而進分三年完成.第一年工作為定量 流、任意斷面、直線定床渠道模式之發展;第 二年工作為變量流、直線動床模式之發展;第 三年則為變量流、蜿蜒河道動床模式之發展及 在曾文溪之實例應用.
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    台灣地區河川輸砂模式之研選應用研究(I)
    (1995)
    楊錦釧
    ;
    J.C. Yang
    ;
    國立交通大學土木工程研究所
    本計畫係由台大土木系、成大水利系及交 大土木系組成一研究群與美國能源管制委員會 (FERC)合作,評估十二個河道輸砂數值模式,全程 計畫擬分三年施行之,主要的工作包括模式理 論及其適用條件之探討;各個模式重要影響參 數之篩選及局部敏感度之測試及對台灣某特定 河川之測試及分析.目前本計畫已進行兩年半, 工作方向及進度大致均能依預定進度施行之, 曾於80年12月16-18日在美國華盛頓特區召開第一 次雙邊研討會,並於去年度之計畫中已大致完 成上述之工作項目.本年度計畫之工作主要將 包括籌劃及召開第二次中美雙邊會議,並擬依 會議之結論進行下一步之工作,原則上將彙總目前各個模式之測試結果,建立評估總表,並就 篩選剩餘之幾個模式進行較深入之比較分析. AC04900551交通大學土木工程研究所
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    河川空間利用之研究---子計畫三：低水河槽沈滓及汙染質傳輸之模擬(I)
    (1995)
    楊錦釧
    ;
    J.C. Yang
    ;
    國立交通大學土木工程學系
    本研究主要目的乃擬發展一數值模式,期能 合理模擬台灣河川低水時蜿蜒渠槽之流況、沈 滓及汙染質傳輸行為,藉以提供河川低水治理 規劃之參考.本研究為顧及實際應用價值,將蜿 蜒渠槽複雜之三維流況簡化為擬似三維,以水 深平均二維模式為基本架構,但加入二次流之 影響.本模式基本上可大致分為四個子模式,第 一部分為曲線座標水深平均二維水理模式;第 二部分為二次流模式;第三部分為輸砂模式;第 四部分為汙染質傳輸模式.數值方法將採用有 限差分法,為適切模擬天然河道蜿蜒不規則之 形狀,本模式之建立採用正交曲線座標系統.模 式之結果將與前人之實驗結果進行比對驗證,並應用於曾文溪下游段之模擬.本計畫將分三 年進行,第一年進行水理及二次流模式之建立 與測試;第二年進行輸砂及汙染質傳輸模式之 建立與測試;第三年進行曾文溪之應用研究.
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    河川空間利用之研究(II)---子計畫七：蜿蜓河道有限解析法動床模式之研發及應用(II)
    (1996)
    葉克家
    ;
    KEH-CHIAYEH
    ;
    國立交通大學土木工程學系
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    河川空間利用之研究---子計畫六：低水河槽沈滓及汙染質傳輸之模擬(III)
    (1997)
    楊錦釧
    ;
    J.C. Yang
    ;
    交通大學土木工程研究所
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    集集地震對水文現象影響之研究(II)---子計畫V：堰塞湖蓄水溢頂之流場及輸砂實驗研究
    (2001)
    葉克家
    ;
    KEH-CHIAYEH
    ;
    國立交通大學土木工程學系
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    High concentration suspended sediment measurements using time domain reflectometry
    (2011-04-20)
    Chung, Chih-Chung
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    Lin, Chih-Ping
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    土木工程學系
    ;
    防災與水環境研究中心
    ;
    Department of Civil Engineering
    The existing methods of suspended sediment concentration (SSC) monitoring provide a measurement accuracy significantly influenced by the particle size of suspended sediments, function only under limited measurement range and are not cost effective for field maintenance as well as wide spatial coverage. The paper introduces an innovative SSC monitoring methodology based upon time domain reflectometry (TDR), especially emphasizing on optimum TDR measurement accuracy investigated theoretically and experimentally. Pertinent probe design, probe calibration, as well as data reduction procedures were proposed. Ultimately, the approach can achieve the measurement accuracy to adapt the derived hardware resolution and beyond. In addition, the performance evaluation was carried out considering possible influence factors including water salinity, sediment types and particle sizes, and leading cable lengths. TDR SSC measurements indicate insensitive to sediment particle sizes. After proper calibration, the measurements are also insensitive to water electrical conductivity and not affected by leading cable resistances. There are further advantages of the TDR method including high measurement range from 2 to at least 300 g L(-1), easy calibration, robustness, maintainability, and cost-effective multiplexing. (C) 2011 Elsevier B.V. All rights reserved.