本文應用質點影像測速儀（Particle Image Velocimetry，PIV）量測波浪作用下潛堤附近流場與渦流渦度的變化。試驗於二維試驗水槽中進行，利用試驗所量測到的流速資料可以求得流場分佈與渦流渦度。本文在水平底床及斜坡底床的試驗配置下，探討單列潛堤與雙列潛堤的流場特性，並且討論渦度與雷諾數之關係。經試驗結果發現，當各試驗配置的波浪週期變大時，波浪能提供渦流生成的波能愈多，堤角附近所產生之渦流大小愈明顯。在雙列潛堤配置時，當波浪週期變長，堤角附近生成之渦流規模變大，兩潛堤間之渦流會有互相影響的趨勢。渦度與雷諾數間之關係呈現當雷諾數值愈大渦度值也會隨之增加的趨勢。

　Present research uses Particle Image Velocimetry (PIV) to measure the changes of the velocity and the vorticity fields around the submerged breakwaters, as influenced by the wave interactions. The experiment is conducted in a two-dimensional experimental tank. The measured current velocities are used to calculate the velocity fields and the vorticity. The study addresses changes in the flow characteristics associated with a single submerged breakwater and the double submerged breakwaters with horizontal bottom and slope bottom, and to discuss the relationship between vorticity and Reynolds number. According to the results obtained from the experiments, when the period of wave is getting long that more wave energy can be provided to produce vortex from wave and the size of vortex is clearer nearby the corner of structure. In presence of double submerged breakwaters, when the period of wave is getting long that the scale of vortex has become larger nearby the corner of structure and there is a tendency of vortex interactions between the double submerged breakwaters. The relationship between vorticity and Reynolds number has to present that vorticity is also trend toward larger when Reynolds number become bigger.

1.Chang, K. A, Hsu, T. J. and Liu, L. F., “Vortex Generation and Evolution in Water Waves Propagating over a Submerged Rectangular Obstacle,” Coastal Engineering, Vol. 44, pp. 13-36 (2001).
2.Keane, R. D. and Adrain, R. J., “Optimization of Particle Image Velocimeters. PartI：Multiple-pulsed Systems,” Measurement Science and Technology, Vol. 1, pp. 963-974 (1990).
3.Keane, R. D. and Adrain, R. J., “Optimization of Particle Image Velocimeters. PartII：Multiple-pulsed Systems,” Measurement Science and Technology, Vol. 2, pp. 963-974 (1991).
4.Keane, R. D. and Adrain, R. J., “Theory of Cross-Correlation Analysis of PIV Images,” Applied Scientific Research, Vol. 49, pp. 194-215 (1992).
5.Petti, M., Quinn, P. A., Liberatore, G.. and Easson, W. J., “Wave Velocity Field Measurement over a Submerged Breakwater,” Proceedings of 24th International Conference on Coastal Engineering, Japan, ASCE, pp. 525-539 (1994).
6.Scarano , F. and Riethmuller , M. L., “Iterative Multigrid Approach in PIV Image Processing with Discrete Window Offset”, Experiments in Fluids, Vol. 26, pp 513 - 523 (1999)
7.Ting, F. C. K. and Kim, Y. K., “Vortex Generation in Water Waves Propagation over a Submerged Obstacle,” Coastal Engineering, Vol. 24, pp. 23-49 (1994).
8.Westerweel, J. “Efficient Detection of Spurious Vectors in Particle Image Velocimerty Data”, Experiments in Fluids, Vol. 16, pp 236-247 (1994)
9.Westerweel, J., Dabiri , D. and Gharib, M., “The Effect of a Discrete Windows Offset on the Accuracy of Cross-correlation Analysis of Digital PIV Recordings”, Experiments in Fluids, Vol. 23, pp 20-28 (1997)
10.岳景雲，曹登皓，陳丙奇 (1998) “波浪通過斜坡底床上不透水潛堤之研究”，第九屆水利工程研討會論文集，A1頁 - A8頁。
11.歐善惠、許泰文、辛志勇、陳琬婷、許健略（2001）“應用質點影像測速系統於波浪通過系列潛堤之流場量測”，第二十三屆海洋工程研討會論文集，193頁–200頁。
12.辛志勇，”質點影像自動測速系統之發展與其應用於波場流速量測”，國立成功大學水利暨海洋工程研究所碩士論文。(2001)
13.蔡清標、陳鴻彬、李芳君 (2001) “波浪通過斜坡孔隙底床上透水式潛堤之研究”，第二十三屆海洋工程研討會論文集，257頁–264頁。
14.歐善惠、許健略、陳婉婷、陳義芳 (2002) “波浪通過系列潛堤流場之研究”，第二十四屆海洋工程研討會論文集，252頁-259頁。
15.黃盈純，”波浪通過複合式人工沙漣布拉格效應之研究”，國立成功大學水利暨海洋工程研究所碩士論文。(2002)
16.蔡立宏、許泰文、黃盈純（2003）“波浪通過復合式系列潛堤之布拉格反射研究”， 第二十五屆海洋工程研討會論文集，467頁-474頁。
17.歐善惠、謝志敏、陳義芳（2003）“波浪通過斜坡底床上潛堤之流場研究”， 第二十五屆海洋工程研討會論文集，171頁-178頁。
18.歐善惠、廖建明、陳義芳、陳一文 (2004) “波浪通過斜坡底床上潛堤之流場研究”，第二十六屆海洋工程研討會論文集，385頁-392頁。
19.陳義芳，”波浪通過斜坡底床上雙列潛堤之流場研究”，國立成功大學水利暨海洋工程研究所碩士論文。(2004)