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      當前位置:科學網首頁 > 基金首頁 > 南黃海輻射沙洲地區奇異潮汐的時空分布特征和動力學機制研究

      國家自然科學基金項目查詢

      南黃海輻射沙洲地區奇異潮汐的時空分布特征和動力學機制研究

      批準號51709091 學科分類海岸工程 ( E0909 )
      項目負責人馮曦 負責人職稱講師 依托單位河海大學
      資助金額22.00
      萬元
      項目類別青年科學基金項目 研究期限2018 年 01 月 01 日 至
      2020 年 12 月 31 日
      中文主題詞奇異潮汐;潮汐運動;輻射沙洲;運動機理;南黃海
      英文主題詞Odd-tide;tidal propagation;radial sand ridges;dynamic mechanism;The South Yellow Sea

      摘要

      中文摘要 奇異潮汐,又稱“怪潮”,是一種異常高潮位現象,它的出現沒有征兆且來去迅猛,對沿海居民的人身和財產安全威脅極大。南黃海輻射沙洲,灘涂寬廣,潮汐振幅大,是奇異潮汐的多發地區。但前人的研究往往注重個案分析,對當地奇異潮汐的時空分布特征、誘發因素和產生機制還缺乏總結和探索。因此本課題擬以發生在該海域的奇異潮汐為研究對象,從歷史文獻、水文記錄、實測資料出發,擬標準化該地區奇異潮汐的定義,參數化其波形和運動學特征,通過構建覆蓋南黃海輻射沙洲的三維水動力模型,量化奇異潮汐在南黃海的整體性態勢和區域性特征;擬通過建立多維回歸模型,詮釋外部動力因素與其特征參數的相關性,并通過建立理想化數值模擬實驗,測試其對外部各要素的敏感度;從動量平衡方程出發,通過理論分析和數值模擬相結合的手段,研究對流項、二次底部摩阻、科氏力等各項對水位梯度的影響,擬以此揭示該海域奇異潮汐產生、發展和衰敗的動力學機制。
      英文摘要 Co-oscillating tide, also called "odd-tide" is a kind of abnormal phenomenon of high tide. It usually comes without any sign and the associated flood roars on, swift and violent. The South Yellow Sea Radial Sand Ridges are featured by broad beaches and large tidal amplitude. The "odd-tide" happens frequently here. Previous studies tended to focus only on case-study analysis while lacking the summary on the local characteristics of space and time, as well as the exploration of the factors and generation mechanism for the "odd-tide". This study will focus on the "odd-tide" in the South Yellow Sea Radial Sand Ridges. It will start from collecting historical documents, hydrological records, and measured data, to standardize the definition of "odd-tide" in this area; parameterized its waveform and kinematics characteristics. A three-dimensional hydrodynamic model will be employed to cover the hydrodynamics over the South Yellow Sea Radial Sand Ridges. It will be used to quantify the integrity tendency and regional features of "odd-tide". By establishing the idealized models, the tests will be operated to find out the sensitivity of the "odd-tide" to a variety of external elements; multidimensional regression models will be built to interpret the correlations between the external motivation factors and the characteristic parameters of "odd-tide". Starting from the momentum balance equation, by means of combining theoretical analysis and numerical simulation, this study will analyze how the associated momentum terms, such as advection, secondary bottom friction, Coriolis force, influence the water level gradient; in order to reveal the dynamic mechanism of the formation, development and decline of the "odd-tide".
      結題摘要

      成果

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