本文關(guān)鍵詞： 內(nèi)波實驗 垂向模態(tài) PIV技術(shù) 相位干涉　出處：《海洋與湖沼》2017年03期 　論文類型：期刊論文

【摘要】：為了研究內(nèi)波遠距離傳播過程中的演化規(guī)律,本文采用圖像測速法(PIV)分別對內(nèi)波近場和遠場的速度場進行測量。實驗中同時采用兩臺CCD相機對實驗區(qū)域進行拍攝,根據(jù)實驗結(jié)果對內(nèi)波能量和垂向模態(tài)結(jié)構(gòu)進行計算分析。實驗結(jié)果表明,在近場區(qū)域生成的內(nèi)波主要表現(xiàn)為內(nèi)波射線結(jié)構(gòu)。內(nèi)波射線在經(jīng)過海表面反射后,其能量在空間上出現(xiàn)非對稱結(jié)構(gòu),能量在加強區(qū)域較減弱區(qū)增加約15%。在遠場,內(nèi)波射線結(jié)構(gòu)不再清晰,內(nèi)波主要表現(xiàn)為低模態(tài)內(nèi)波結(jié)構(gòu)。內(nèi)波射線在反射時能量衰減顯著,損失約為50%;低模態(tài)內(nèi)波可以離開內(nèi)波生成源地遠距離傳播,傳播過程中能量損失較小,在遠場傳播過程中(第一模態(tài)內(nèi)波半波長的距離)能量損失約20%。低模態(tài)內(nèi)波的傳播相速度介于垂向第一模態(tài)和第二模態(tài)相速度之間。
[Abstract]:In order to study the evolution law of internal wave during long distance propagation, this paper uses image velocimetry to measure the velocity field of internal wave near field and far field respectively. Two CCD cameras are used to photograph the experimental area. According to the experimental results, the internal wave energy and the vertical mode structure are calculated and analyzed. The experimental results show that the internal waves generated in the near field are mainly the internal wave ray structure, and the internal wave rays are reflected through the sea surface. In the far field, the internal wave ray structure is no longer clear, and the internal wave is mainly characterized by low mode internal wave structure. The loss is about 50. The low mode internal wave can propagate far away from the source of the internal wave, and the energy loss in the process of propagation is relatively small. In the process of far-field propagation, the energy loss (the distance of half wavelength of the first mode internal wave) is about 20. The phase velocity of the low mode internal wave is between the vertical first mode and the second mode.
【作者單位】： 東海艦隊海洋水文氣象中心;中國海洋大學物理海洋教育部重點實驗室;
【基金】：國家自然科學基金項目,41476001號,41276008號
【分類號】：P731.24
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本文編號：1523296