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。

Zengwen Reservoir was designed and built on the upstream of Zengwen River, Chiayi County, and was completed on October 31, 1973. Being the largest reservoir in Taiwan, Zengwen Reservoir is the most important water resource facility in southern Taiwan and has been operating for 46 years since completion. To protect the residents downstream of the reservoir and maintain sustainability, ensuring the safety and stability of the dam and its affiliated facilities during the operation of the Zengwen Reservoir become the most critical issue. Therefore, South Region Water Resources Office had proposed the technical service project, “Safety Surveillance, Inspection and Analysis of Zengwen Reservoir in 2019,” to continuously carry out the monitoring analysis and related field inspection to assure the safety of the dam. The scope of the project includes the Zengwen Reservoir dam, the spillway, affiliated facilities(hydraulic machine and electromechanical equipment), adjacent slopes, landslide areas, the desilting tunnel and bridges in the reservoir area. According to the results of monitoring analysis and field inspection, the seepage of the dam was stable and the water quality was clear, it is judged that the dam has no abnormal seepage behavior. Moreover, there are no subsidence on the crest, upstream and downstream slopes, and no unnatural conditions such as displacement, seepage, crack et al. Results showed that the dam is stable and secure. However, some reading of the piezometers in the core was undulating, further actions such as continuous attention are recommended. The field inspection results of spillway were generally good, no obvious new cracks or damages at the repaired cracks have been observed. The groundwater level on the right side of the spillway was lower than both the chute surface and the management value, no sign was found that could affect the stability of the chute and spillway. Structures and hydraulic machines of affiliated facilities such as spillways, power generation intakes, permanent river discharge channels, and desilting tunnel were all in good condition and no clear evidence was observed that could affect reservoir safety and machine operation. The surveillance results of slopes near the dam and four landslide areas around reservoir region were generally good, no obvious unstable signs such as cracks, displacement and shift have been observed. Slope support and slope protection facilities on the inlet and outlet of desilting tunnel were in good condition and no obvious sign was identified which could affect slope safety and tunnel performance. After several desilting operations this year, no obvious lining anomalies had been identified in the desilting tunnel. Overall, the desilting tunnel is safe and stable. According to the field inspection and D.E.R.&U. Evaluation Criteria, all bridges, including four bridges on Zengwen dam access road, steel bridge for desilting tunnel, dam spillway bridge and observation tower pedestrian bridge, had been assessed through its structure and functionality. The results presented that all bridges were generally in good condition and well functioning. In summary, the overall condition of the dam, spillway, auxiliary facilities, adjacent slopes and sliding areas, desilting tunnel, and bridges in the Zengwen Reservoir area were generally good. There is no immediate danger to reservoir storage safety and facility operation. The dam is overall stable and secured.