圖書典藏及影音數位平台

曾文水庫位於嘉義縣曾文溪主流柳籐潭上游，為一多目標水庫，於民國56年10月31日開工，歷時六載於民國62年10月31日完工，自開始蓄水營運至今已達44年，期間除提供嘉南平原地區農業、工業及民生用水外，並充份發揮其防洪、發電及觀光之功能。 為確保本水庫蓄水及營運期間壩體之安全及穩定，以提供水庫下游民眾生命財產之安全保證，長期以來本水庫即利用大壩埋設之儀器及設備，於水庫營運期間持續辦理監測，並對大壩進行定期或不定期安全檢查，以維本水庫營運期間之壩體安全性。 由於土石壩安全監測儀器及設備資料，研判分析的工作涉及土木、大地、水利、地質、電氣、儀器系統、風險管理等多項專長的結合，屬特殊的專長領域。且目前本局人力資源現況亦難以負擔本項工作的執行，亟需要專業工程師協助辦理安全監測相關業務及監測資料判讀分析工作。

This project is a routine surveillance work of Zengwen dam for dam safety during 2018. It has been entrusted by Southern Region Water Resources Office, WRA, MOEA (WRASB), owner of Zengwen dam, and it was executed by Sinotech Engineering Consultants, INC. (Sinotech). This routine surveillance monitors dam facilities and pre-installed instruments to ensure dam safety and its facility in normal condition. Work Includes: 1.Monitoring and data review; 2.Facilities and reservoir interim inspection; 3.Inspection of bridges of Tsengwen dam access road; 4.Dam safety assessment; 5.Review of monitoring program; 6.Technical advisory; 7.Reports. According to the results of inspection and monitoring data review, the seepage condition of the dam is generally stable and no abnormal displacement development is observed. No abnormal condition affecting the safety of dam be found by in-situ inspection. But some of the reading of piezometers in core was unstable while high water level, continuously attention should be paid and new instrument for correcting more information are suggestted. Structures and hydraulic machine of auxiliary facilities such as spillways, power generation intakes and permanent river discharge channels are in good condition and no obvious conditions that could affect reservoir safety and operational performance are observed. The surveillance results of slopes near dam and four landslide areas around water rim are generally good, no obvious unstable sign have been observed. The reservoir water level are first time rised from EL.227m to EL.230m at 23th August. After intensive monitoring and inspection, according the safety maintenance manual for water level rising, no abnormal condition are found during this time. According to the in-situ inspection and D.E.R.&U. Evaluation Criteria to assess the current function of four bridges on Zengwen dam access road, each bridges are generally normal and may continue to be used. All the defects found in last year have been repaired in this year. Based on the Potential Failure Mode Analysis (PFMA) conducted by the fifth safety assessment in 2017, the review of monitoring program is conducted, which is to review the monitoring capabilities of each potential failure mode development process. In order to effectively grasp the abnormal seepage behavior and piping at early stage in core of the dam, drill hole to install a piezometer at bottom of chimny drain is suggested.