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研究生:向雲謙
研究生(外文):Yun-Chen Shiang
論文名稱:重力測量技術估計水庫淤砂量變化:以曾文水庫為例
論文名稱(外文):Estimation of Sediment Variation by Gravimetry estimation:A case study in Tseng Wen Reservoir
指導教授:蕭宇伸蕭宇伸引用關係
指導教授(外文):Yu-Shen Hsiao
口試委員:郭重言曾子榜黃鉅富
口試委員(外文):Chung-Yen KuoTzu-Pang TsengJiu-Fu Huang
口試日期:2015-07-21
學位類別:碩士
校院名稱:國立中興大學
系所名稱:水土保持學系所
學門:農業科學學門
學類:水土保持學類
論文種類:學術論文
論文出版年:2015
畢業學年度:103
語文別:中文
論文頁數:74
中文關鍵詞:重力測量水庫淤積地形改正FG5
外文關鍵詞:gravimetryreservoir sedimentterrain correctionFG5
相關次數:
  • 被引用被引用:1
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  • 下載下載:28
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本研究利用模擬重力值與觀測重力變化量嘗試計算曾文水庫因大雨所造成的土砂淤積變化量。模擬重力值計算採用地形改正原理,觀測重力則於現地觀測兩期(2014年11與2015年3月)之FG5重力值。本研究選定3個重力基準點做為模擬重力值與觀測重力之比較分析地點。在模擬各種淤積(淤積增加0、3、13公尺)與水位(水位增加0、9、18公尺)組合情況下時的地形改正值計算中,發現重力基準站2(曾文水庫閘控室)的重力變化最為明顯,13公尺的淤積會產生11μGal的重力變化。實地測量中,發現兩期FG5觀測值存在23μGal的系統誤差,在改正系統誤差後,與模擬結果相差8.3μGal,主要原因為(1)未考慮地下水與土壤溼度(2) 2008年5公尺DEM與現在地形不同(3)水利單位在兩期重力測量間的清淤量。


The study is aimed at estimating sediment variation in Tseng-Wen reservoir due to torrential rain conditions by considering simulated and observed gravity changes. The method for computing simulated gravity is based on terrain corrections (TC). Observed gravity was obtained from two FG5 practical surveys in November, 2014 and March, 2015. Three gravity stations were selected for analysis and comparisons of simulated and observed gravity.
We designed different conditions of sediment (increase of 0, 3 and 13m) and water (increase of 0, 9 and 18m) levels in order to derive gravity changes at three gravity stations. The gravity variation was most extreme at gravity station 2 and reached 11μGal while the sediment level increased 13m. Systematic error of 23μGal was found between two FG5 observations. After systematic error correction, the difference between simulated and observed gravity changes was 8.3μGal by comparing two FG5 observations. The reasons causing the diff may include: Influences (1) of underground water and soil moisture, (2) of 5m-resolution DEM in 2008, (3) of Reservoir dredging.


摘要 i
Abstract ii
致謝 iii
目錄 iv
圖目錄 vii
表目錄 x
第一章 緒論 1
1.1 前言 1
1.2 研究背景與目的 2
1.3 研究流程 5
1.4 文獻回顧 6
1.5 論文架構 8
第二章 重力測量及重力改正 10
2.1 重力測量基本原理 10
2.2 絕對重力測量 11
2.2.1 觀測方式 11
2.2.2 絕對重力值計算 14
2.3 重力改正 14
2.3.1 外在環境引起之誤差 15
2.3.1.1 日、月之潮位引力改正 17
2.3.1.2 海潮改正 18
2.3.1.3 大氣壓力改正 19
2.3.1.4 極移改正 20
2.4 重力測量預估水庫新增淤積量 21
第三章 研究區域與資料蒐集 25
3.1 研究區域 25
3.2 實地重力測量 30
3.2.1 FG5絕對重力儀介紹 31
3.2.2 g7軟體 32
3.3 重力測量模擬 34
第四章 結果與討論 43
4.1 重力模擬結果 43
4.2 絕對重力測量結果 48
4.3 重力模擬與實際測量之比較 56
第五章 結論與建議 60
參考文獻 62
附錄A:水量及淤積量估算相關程式 68
附錄B:絕對重力值觀測成果示意圖 73


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