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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 吳富春(Fu-Chun Wu) | |
| dc.contributor.author | Yu-Chen Chen | en |
| dc.contributor.author | 陳昱辰 | zh_TW |
| dc.date.accessioned | 2021-06-16T23:32:14Z | - |
| dc.date.available | 2015-08-01 | |
| dc.date.copyright | 2012-08-01 | |
| dc.date.issued | 2012 | |
| dc.date.submitted | 2012-07-29 | |
| dc.identifier.citation | Bates, P. D., and J. M. Hervouet, A new method for moving boundary hydrodynamic problems in shallow water, Proc. R. Soc. London, Ser. A, 455, 3107–3128, 1999.
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/65242 | - |
| dc.description.abstract | 河川形貌動力學（River morphology）之知識乃為河岸工程建設與淡水環境棲地復育之基礎。許多特別之現象如河床甲護化（Armoring）及下游顆粒細化（Downstream fining）等，均顯著地影響了河川生物棲地之品質。因此，瞭解中尺度河川地形貌（Meso-scale bedforms）之演變及其底床顆粒之組成變化乃為一重要之課題；然而河川之水流水理、底床之非均勻粒徑組成及輸砂運移事件此三者間複雜之交互作用使得形貌動力之問題非常難以處理。本研究中，吾人發展了一套二維水深平均（Depth-averaged 2D）能夠處理多粒徑輸砂（Mixed-size sediment transport）之有限元素（Finite element）形貌動力模式，並研發了垂直方向連續篩化（Vertical continuous sorting）之演算機制─虛擬質量法（Virtual mass），以試圖瞭解天然河川中常見之區塊動力（Patch dynamics）等問題其形貌與粒徑組成之演變；模式中應用特徵消散有限元素上風方法（Characteristic dissipative Galerkin, CDG scheme）於乾溼演算水理模組（Wetting and drying module）及床貌演變模組（Bed evolution module）以處理傳遞主導（Advection dominated）之砂洲遷移問題中常見之數值不穩定性問題（Numerical instability）。 | zh_TW |
| dc.description.abstract | The knowledge of river morphology is fundamental and useful information for engineering and habitat restoration purposes. Many interesting phenomena such as armoring and downstream fining significantly affect the quality of riverine habitats. Therefore, the development of meso-scale bedforms and the change in their sediment composition have become important topics of study. However, the complex interactions between flood flow, nonuniform particles and sediment transport make these problems difficult to tackle. In this study, we develop a 2D (two-dimensional) many-fraction FE (finite element) morphodynamic model which is capable of dealing with mixed-size sediment transport problems. We also present a new type of vertical sorting scheme, the virtual mass method, to investigate the common phenomenon such as patch dynamics that could occurs in most natural rivers. The proposed model adopts the characteristic dissipative Galerkin (CDG) scheme in the wetting and drying module and bed evolution module such that the convection dominated bar evolution can be computed without numerical instabilities. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-16T23:32:14Z (GMT). No. of bitstreams: 1 ntu-101-R98622019-1.pdf: 4625881 bytes, checksum: b62caf985a7b615c969f334b45bee44d (MD5) Previous issue date: 2012 | en |
| dc.description.tableofcontents | 口試委員會審書 ........................................... i
誌謝 .................................................... ii 中文摘要 ................................................iii 英文摘要 .................................................iv 目錄 ..................................................... v 圖目錄 ................................................. vii 表目錄 .................................................. ix 符號表 ................................................... x 第一章 緒論 ............................................1-1 1.1 前言 ............................................. 1-1 1.3 文獻回顧 ......................................... 1-2 1.4 研究目的 ......................................... 1-4 第二章 理論架構 ........................................2-1 2.1 水理模組 ......................................... 2-1 2.1.1 水深平均雷諾方程式 ............................2-1 2.1.2 乾溼演算控制方程式 ............................2-5 2.2 床貌演變模組 ..................................... 2-8 2.2.1 泥砂連續方程式 ................................2-9 2.2.2 床面基準輸砂式 ...............................2-10 2.2.3 泥砂顆粒摩擦角 ...............................2-19 2.3 粒徑篩化模組 .................................... 2-20 2.3.1 活動層與副表層 ...............................2-21 2.3.2 虛擬質量分配法 ...............................2-22 2.3.3 底床組成穩定演算機制 ......................... 2-26 第三章 數值方法 .......................................3-1 3.1 特徵消散有限元素法 ................................3-1 3.1.1 特徵消散法應用於水理模組 ......................3-2 3.1.2 特徵消散法應用於乾溼演算 .....................3-6 3.1.3 特徵消散法應用於床貌演變組 ....................3-9 3.2 模式執行 ....................................... 3-12 第四章 模式驗證 ........................................4-1 4.1 變量流乾溼演算試驗 .................................4-1 4.2 形貌動力與粒徑篩化驗證 ..............................4-7 第五章 模式應用 ........................................5-1 5.1 新店溪複合流量水理應用 ............................5-1 5.1.1 研究區域地形取樣 .............................5-1 5.1.2 坡度適應格網演算 ..............................5-8 5.1.3 多重流量棲地分析 ............................5-10 5.2 強制床面區塊動力試驗 .............................5-20 5.2.1 試驗材料與方法 ...............................5-20 5.2.2 床面區塊之發展與穩定 .........................5-25 第六章 結論與建議 ......................................6-1 6.1 結論 ............................................. 6-1 6.2 建議 ............................................. 6-2 參考文獻 ................................................7-1 附錄 ...................................................8-1 | |
| dc.language.iso | zh-TW | |
| dc.subject | 特徵消散法 | zh_TW |
| dc.subject | 泥砂篩化 | zh_TW |
| dc.subject | 區塊動力 | zh_TW |
| dc.subject | 形貌動力模式 | zh_TW |
| dc.subject | 多粒徑輸砂 | zh_TW |
| dc.subject | mixed-size sediment | en |
| dc.subject | characteristic dissipative Galerkin | en |
| dc.subject | morphodynamic model | en |
| dc.subject | patch dynamics | en |
| dc.subject | sediment sorting | en |
| dc.title | 以特徵消散有限元素形貌動力模式模擬粒徑篩化現象 | zh_TW |
| dc.title | Simulation of Grain Sorting Using the Characteristic Dissipation Galerkin Morphodynamic ( CDG-Morpho ) Model | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 100-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 蕭政宗,周逸儒,賴悅仁 | |
| dc.subject.keyword | 形貌動力模式,特徵消散法,多粒徑輸砂,泥砂篩化,區塊動力, | zh_TW |
| dc.subject.keyword | morphodynamic model,characteristic dissipative Galerkin,mixed-size sediment,sediment sorting,patch dynamics, | en |
| dc.relation.page | 144 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2012-07-30 | |
| dc.contributor.author-college | 生物資源暨農學院 | zh_TW |
| dc.contributor.author-dept | 生物環境系統工程學研究所 | zh_TW |
| 顯示於系所單位： | 生物環境系統工程學系 | |
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