傳統流量觀測法為使用機械式流速儀量測河川斷面之各個垂線流速分佈，並以面積法推估出斷面流量，但機械式流速儀量測過程耗時費力且易產生許多誤差，為增加現地觀測之效率及準確度，發展出許多新式流量觀測法及儀器。本研究利用都普勒聲波流速儀進行曾文溪五個測站之現地觀測，低流速低水位時使用手持式ADV進行涉測，高流速高水位時使用拖曳式ADCP進行吊測，並同時蒐集河川局利用普萊氏流速儀觀測之流速資料進行比較及驗證，亦進行全洪程流量觀測，以驗證都普勒聲波流速儀於高流量之適用性。
研究結果顯示，低水位時手持式ADV流速儀利用聲波式都普勒方式量測，較傳統機械式(普萊氏)流速儀較不受地形限制，且流速之量測點數比傳統機械式(普萊氏)流速儀多。高水位時拖曳式ADCP可在短時間內消除水流不穩定性流況之影響，同時量測全斷面水深及流速分佈，並計算出流量，顯示出拖曳式ADCP可有效提升高水位時流量觀測之效率及準確度。
另外，將95~99年之水位-流量率定曲線與本研究推求之率定曲線進行比較，本研究得到的率定曲線與96年和97年相似，顯示高水位流量時河川局實測資料與都普勒聲波流速儀推估之流量資料頗為一致，且此量測系統機動性高，具有高效率及準確度，可有效應用於現地流量觀測，未來具有一定之發展性。

The conventional method for flow discharge observation is using mechanic current meters to measure various vertical flow velocity distributions of the river cross-section, so the cross-section flow discharge can be estimated with velocity-area method. However, the measurement with mechanic current meters is time-consuming and error-prone. Various new methods and instruments for surveying flow discharges are developed for improving the efficiency and accuracy of flow discharge observations. This study used acoustic Doppler current meters to perform field observations at five hydrometric stations in Zengwen River. For low river flow velocity and water level, wading personnel with hand-held ADV were deployed to measure the flow velocities; for high river flow velocity and water level, towed ADCP was deployed from a boom to measure the flow velocities. The measurement results were simultaneously compared and verified with the flood velocity data provided by the River Management Office with Price current meters. The survey was also performed for every level of flood discharge to verify the fitness of acoustic Doppler current meters for measuring high flow discharges.
In the case of low water level, this study shows that acoustic Doppler measurement with hand-held ADV is less hindered by local topography than conventional mechanic (Price) current meters.
Furthermore, acoustic Doppler measurement with hand-held ADV produces more measured points of flow velocities than Price current meters. In the case of high water level, towed ADCP can remove the effect of instable flow condition quickly and simultaneously measures the depth and flow velocity distributions in the whole river cross-section to calculate flow discharges. Hence, towed ADCP effectively improves the measurement efficiency and accuracy in the case of high water level.
In addition, the rating curves for flow discharge-water level measured by this study approximate the rating curves of 2007 and 2008 when they are compared with the rating curves of 2006~2010. The flow discharges estimated by acoustic Doppler current meters demonstrate good agreement with the flow discharge data provided by the River Management Office in the case of high water level. In conclusion, the measurement system this paper provides has high mobility, efficiency and accuracy, so it can be effectively applied to field survey of flood discharges. It also has certain capacity for further development.

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