2015-08-012024-05-15https://scholars.lib.ntu.edu.tw/handle/123456789/666017摘要：異重流是流體中因密度差異所產生的流動現象。自然界中，往往因溫差、溶解的物質、懸浮的泥砂等原因，造成密度的差異而自然形成流動現象。異重流運動不但是流體力學中的一個經典問題，在地質、海洋、氣象、工程等相關領域皆有涉及。 過去半世紀的異重流文獻中，針對非渠槽環境中的異重流鮮少探究。自然界中，異重流不僅常見於渠槽環境中，亦常見於非渠槽侷限之環境中。舉例來說，懸浮泥砂產生之異重流在陸棚區沿水下溝渠往下坡移動，當坡度減緩異重流形成扇形區堆積時，即為一非渠槽侷限之流動行為。 本研究計畫以結合理論模型及水槽實驗來分析異重流於非渠槽侷限之環境中的運動行為。預期建立異重流於非渠槽侷限環境中之理論模型，並且由水槽實驗量化運動時所遵循物理定律的常數。本計畫所獲致之成果不僅是學理上之創新，更有助於相關領域評估非渠槽侷限環境中的異重流及其影響，於理論及實際皆有指標意義。 本研究在學理上，補足了文獻中的一塊缺角；在研究技術上，持續發揮申請人長期發展所獲致之經驗及技術；在教育意義上，提供學生學習先進研究方法及參與國際交流的機會。本研究團隊過去以及預期所發展的成果，將使國內此領域之科學研究在國際上建立知名度。 <br> Abstract: Gravity currents, also known as density currents, are flows driven by a density difference. The density difference can be attributed to a number of factors, including temperature differential and dissolved or suspended materials. Gravity currents are not only one of the classic problems in fluid mechanics but also play an important role in geology, oceanography, meteorology, and engineering. In the literature of study of gravity currents of more than five decades, most attention is focused on gravity currents in a channelized environment but little is known on gravity currents in an unconfined environment. In nature, gravity currents oftentimes but not always find themselves in a channelized environment. For example, gravity currents run down the continental shelf through submarine channels and can spread laterally when reaching a submarine fan. The proposed project puts together the experiences and skills of the PI in theoretical and experimental methods to study the gravity currents on a slope in an unconfined environment. We will systematically investigate the influence of slope angle and density contrast on the gravity currents in an unconfined environment. It is expected that the knowledge gained in this project is not only a breakthrough in scientific research but also useful to assist the researchers in related fields of study. From a perspective of scientific research, the proposed project compliments existing studies of gravity currents; from a perspective of developing research tools, the project assists the author to continually enhance the expertise developed over the years; from an educational perspective, the project offers the opportunities for the students to study advanced skills and interact with international scholars. It is believed by the team led by the PI, the research performed previously and conducted in this proposed project will put the scientific research in our country in the international spotlight.異重流斜坡非侷限環境水槽實驗Gravity currentsslopeunconfined environmentflume experiments