- 學位論文
以快速且微侵入法量測感潮河段流量
A fast and minimally intrusive method of discharge measurement in a tidal stream
摘要
感潮河段之水理情形，主要受到河口潮位變化與河川上游流量的影響，隨著河川流量、潮汐強弱而有所改變，在此複雜流況之河段量測流量時，傳統流量量測儀器及方法的準確性並不高，既耗時效率也低，因此有必要利用有別於傳統之量測儀器及方法量測感潮河段流量。本研究選在基隆河感潮河段南湖大橋，將鉛魚裝在高精度聲波杜普勒流速儀Argonaut-SW由捲揚器垂放於欲施測之垂線並把儀器改裝為可移動式，由水面往下量測，以河川斷面之方式實際量測感潮河段流量；並應用以機率觀念為基礎之流速分佈理論，推求各測線之平均流速，及利用中斷面法求取流量。再利用前所量測資料建立一高效率流量量測方法，即利用平均流速與最大流速之關係為定值，並在發生最大流速所在之垂線位置推估最大流速，進而推估平均流速。其次由水位與通水斷面積關係求得通水面積，將兩者乘積後即可取得推估流量資料。於本研究建立之高效率流量量測方法結果良好，所推估流量和實測流量經比較後並具有相當之準確度，可於未來測得即時流量，大幅降低於感潮河段流量量測之時間、人力及成本。
並列摘要
The hydrodynamic in estuarine river is affected by inflow and tide， so that the end of the estuarine river is often changed. Measure discharge is inaccurately at estuary is affected by tidal. The tidal stream is unsteady，we need efficient discharge measurement instrumentation and method to measure discharge. The study used the Argonaut-SW measurement instrumentation measured discharge for complete tidal in the Keelung River. And accurate calculation of discharge by Chiu`s Velocity Distribution and the Mid-Section Method. Then Use the data to establish an efficient method of discharge measurement in tidal streams by relationship between mean velocity and maximum velocity and relationship between water level and cross-sectional area. This efficient method can be used with any current meter to reduce the time and cost of discharge measurement in tidal streams.
參考文獻
延伸閱讀
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