本文選題：緩坡方程 + 水動力��； 參考：《大連理工大學(xué)》2014年碩士論文

【摘要】：近岸波浪及波浪破碎后產(chǎn)生的近岸流是近岸泥沙輸運的重要水動力因素。其中波浪在近岸區(qū)域的掀沙作用比較明顯,波浪破碎所產(chǎn)生的近岸流起著關(guān)鍵的輸沙作用。防波堤對海岸工程和海床沖淤的防護具有非常重要的作用。因此,研究防波堤對近岸波浪、近岸流及其作用下泥沙輸運的影響,對于準(zhǔn)確研究海岸線的侵蝕與淤積,進一步解決相應(yīng)的實際工程問題具有非常重要的意義。 本文基于近岸波浪模型、近岸流模型及泥沙輸運模型對近岸波浪、近岸流及防波堤對近岸流和泥沙輸運過程的影響進行了數(shù)值模擬研究。研究中,首先基于全面考慮近岸波浪折射、繞射效應(yīng)的拋物型緩坡方程、考慮波浪影響效應(yīng)的平面二維淺水方程,建立了近岸波浪及波生流數(shù)值模型。應(yīng)用所建模型對土耳其地中海的Obakoy海岸波浪、波生近岸流進行了數(shù)值模擬,驗證分析了模型在實際近岸海域的有效性和適用性,并對該海岸波浪沿不同方向入射時破碎所形成的近岸波流場進行了討論分析。 在近岸波浪及近岸流數(shù)值模型研究的基礎(chǔ)上,結(jié)合平面二維懸沙和底沙輸運方程及海岸演變模型,建立了近岸波流場中的泥沙輸運及海岸演變數(shù)值模型。采用著名的LSTF波浪和近岸流作用下的泥沙輸運物理模型試驗結(jié)果對所建數(shù)值模型進行了分析驗證。在此基礎(chǔ)上,應(yīng)用所建數(shù)值模型模擬并分析了不同波浪入射條件和防波堤布置方式對近岸波生流及其作用下泥沙輸運的影響。 研究結(jié)果表明,本文所建數(shù)值模型可以有效地用于模擬近岸波浪和近岸流及其影響下的泥沙輸運和海岸演變過程；合理的防波堤布置方式可以有效地防護近岸波浪和近岸流對岸灘的侵蝕。
[Abstract]:Inshore waves and the inshore currents produced by wave breakage are important hydrodynamic factors for sediment transport. The sediment lifting effect of wave is obvious in the coastal area, and the nearshore current caused by wave breaking plays a key role in sediment transport. Breakwater plays an important role in coastal engineering and the protection of seabed erosion and deposition. Therefore, it is of great significance to study the influence of breakwater on coastal waves, inshore currents and sediment transport under the action of shoreline erosion and siltation, and to further solve the corresponding practical engineering problems. Based on the inshore wave model, inshore current model and sediment transport model, the effects of inshore wave, nearshore current and breakwater on the inshore flow and sediment transport process are numerically simulated in this paper. The numerical model of near-shore wave and wave-induced current is established based on the parabolic gentle slope equation considering the wave refraction and diffraction effect and the plane two-dimensional shallow water equation considering the wave effect. The model is applied to the numerical simulation of the Obakoy coastal waves and waves in the Turkish Mediterranean Sea, and the validity and applicability of the model in the actual coastal waters are verified and analyzed. The near-shore wave flow field caused by the breakup of the coastal wave along different directions is discussed and analyzed. Based on the study of numerical models of near-shore waves and near-shore currents, combined with two-dimensional suspended sediment transport equations and coastal evolution model, a numerical model of sediment transport and coastal evolution in near-shore wave and current field is established. The results of the physical model test of sediment transport under the action of famous LSTF waves and near-shore currents are used to analyze and verify the established numerical model. On this basis, the effects of different wave incidence conditions and breakwater arrangement on the near-shore wave-induced current and sediment transport under the action of the wave are simulated and analyzed by using the established numerical model. The results show that the numerical model presented in this paper can be used to simulate the sediment transport and coastal evolution under the influence of inshore waves and inshore currents. The reasonable arrangement of breakwater can effectively prevent the erosion of shoreline caused by inshore waves and inshore currents.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U656.2;TV149

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