本文選題：大窯灣 + 水波振蕩��； 參考：《大連理工大學(xué)》2014年碩士論文

【摘要】：大窯灣水域呈窄長型,特別是灣底水域更窄,港內(nèi)水域僅由南、北航道與外海聯(lián)通,已建泊位多為重力沉箱式(全反射邊界)。當(dāng)波浪自外海經(jīng)口門傳入大窯灣港內(nèi)時(shí),由于受水下地形和灣內(nèi)岸線形態(tài)等影響,會(huì)發(fā)生折射和(多次)反射,入射波浪能量耗散困難。上述因素均為港灣水面振蕩的誘發(fā)因素。大窯灣港區(qū)是否會(huì)發(fā)生水波振蕩、發(fā)生的條件及強(qiáng)度如何等問題,是全灣規(guī)劃方案制定過程中重點(diǎn)關(guān)注的問題。采用Boussinesq數(shù)值波浪模型對上述問題進(jìn)行研究。 首先采用改進(jìn)的Boussinesq數(shù)值波浪模型,模擬白噪聲作用下大窯灣全灣水域的波面響應(yīng)狀況,通過頻譜分析得到大窯灣港內(nèi)不同位置水域的響應(yīng)波幅譜,并與放大因子曲線進(jìn)行擬合,估計(jì)得到大窯灣港內(nèi)不同位置水域的固有頻率。 考察了單色波(規(guī)則波)和隨機(jī)波浪入射時(shí)全灣水域波面響應(yīng)狀況,發(fā)現(xiàn)大窯灣港內(nèi)不同位置水域的響應(yīng)狀況存在顯著差別。故將易發(fā)生水面劇烈波動(dòng)的灣底水域和南岸—期小港池水域視為獨(dú)立的“灣內(nèi)灣”,從重點(diǎn)水域的響應(yīng)波面、頻譜及和小波譜三個(gè)方面對大窯灣灣底水域、南岸一期小港池水域以及全灣整體水域發(fā)生水波振蕩的特征進(jìn)行了全面分析。研究表明： 1.單峰譜波浪作用下,全灣水域發(fā)生整體水波振蕩的入射波周期約為Tp=60s,遠(yuǎn)大于當(dāng)?shù)赝夂２ɡ丝赡艹霈F(xiàn)的周期；灣底和南岸一期小港池局部水域發(fā)生水波振蕩的最小周期在Tp=11-13s之間,接近當(dāng)?shù)赝夂２ɡ丝赡艹霈F(xiàn)的周期；因此,灣底和南岸一期小港池局部水域具備發(fā)生水波振蕩的條件,而全灣整體水域發(fā)生水波振蕩的可能性不大。 2.雙峰譜波浪作用下,在譜能量和雙峰譜的低頻譜峰頻率與單峰譜波浪相同的條件下,與單峰譜作用比較,發(fā)生水波振蕩的幅度更大。 3.針對大窯灣港內(nèi)易發(fā)生水波振蕩的局部水域(灣底和南岸一期小港池水域),提出5種方案,模擬結(jié)果顯示：在發(fā)生水波振蕩的局部水域的邊界增設(shè)孔隙層(反射系數(shù)0.7)方案可有效防止灣底和南岸一期小港池水域水波振蕩的發(fā)生；在北岸28-29號(hào)泊位區(qū)域保留800m×600m水域方案,可有效減弱灣底水域的振蕩。此外,上述兩個(gè)方案均有提高全灣水域水面平穩(wěn)度的作用。
[Abstract]:The waters of Dayaowan Bay are narrow and long, especially the bottom waters of the bay are narrower. The waters in the harbor are only connected by the south and north waterways to the outer sea, and most of the berths have been built as gravity caisson (total reflection boundary). When waves pass from the open sea to Dayaowan port, due to the influence of underwater topography and shoreline shape in the bay, refraction and (multiple) reflection will occur, and the energy dissipation of the incident wave will be difficult. All the above factors are the inducing factors of the bay water surface oscillation. Whether there will be water wave oscillation in Dayaowan port area, the conditions and intensity of water wave oscillation, etc. The Boussinesq numerical wave model is used to study the above problems. In this paper, an improved Boussinesq numerical wave model is used to simulate the wave surface response of the whole water area of Dayaowan Bay under white noise. The amplitudes of the response waves in different water areas of Dayaowan Harbour are obtained by spectrum analysis and fitted with the amplification factor curve. The natural frequencies of different water areas in Dayaowan Port are estimated. The response of the whole bay water surface under the incident of monochromatic wave (regular wave) and random wave is investigated. It is found that there are significant differences in the response of different water areas in Dayaowan Harbour. Therefore, the bay bottom waters which are prone to severe water surface fluctuations and the waters of Xiaogang pond on the south coast are regarded as independent "bay inside bay". The response wave surface, spectrum and wavelet spectrum of the key waters are considered to be the bottom waters of Dayaowan Bay from three aspects: the response wave surface, the frequency spectrum and the wavelet spectrum. The characteristics of water wave oscillation in the waters of Xiaogang pond and the whole bay are analyzed. Research shows that: 1. Under the action of single peak wave, the incident wave period of integral water wave oscillation in the whole bay waters is about 60 s, which is much larger than that of the local offshore wave, and the minimum period of water wave oscillation in the local waters of the bay bottom and the first Xiaogang pond in the south coast is between Tp=11-13s. It is close to the possible period of local offshore waves, therefore, the local waters of the bay bottom and the first Xiaogang pool on the south coast have the conditions for water wave oscillation, but the whole bay water area is not likely to occur water wave oscillation. 2. Under the action of bimodal wave, the amplitude of water wave oscillation is larger than that of single peak wave under the condition that the energy of spectrum and the frequency of low spectral peak of bimodal spectrum are the same as those of single peak wave. 3. In view of the local waters in Dayaowan Port which are prone to water wave oscillation (the bay bottom and the waters of the first stage of the Xiaogang pond on the south coast), five schemes are put forward. The simulation results show that the method of adding pore layer (reflection coefficient 0.7) to the boundary of the local waters where water wave oscillation occurs can effectively prevent the occurrence of water wave oscillation in the waters of the bay bottom and the first stage of the Xiaogang pool on the south shore, and retain the water area of 800m 脳 600m in the berth area of No. 28-29 on the north coast. The oscillation in the bottom of the bay can be effectively attenuated. In addition, the above two schemes can improve the water surface stability of the whole bay.
【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(hào)】：P731.2

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 王崗;馬小舟;馬玉祥;董國海;;短波對港池長周期振蕩的影響[J];工程力學(xué);2010年04期

2 王鐘　,龍寶森;半封閉海灣固有振動(dòng)周期的數(shù)值計(jì)算[J];海岸工程;1998年04期

3 史宏達(dá);徐國棟;孫龍龍;;矩形港池的港內(nèi)共振研究[J];海岸工程;2011年02期

4 陳雪英,胡澤建;雙峰譜型海浪波高與周期的聯(lián)合分布[J];黃渤海海洋;1997年04期

5 馬小舟;董國海;滕斌;;破碎帶波浪的數(shù)值模擬[J];計(jì)算力學(xué)學(xué)報(bào);2007年02期

6 馬小舟;劉嬪;王崗;董國海;;孤立波作用下細(xì)長港響應(yīng)的數(shù)值研究[J];計(jì)算力學(xué)學(xué)報(bào);2013年01期

7 潘錦嫦;油輪系泊墩式碼頭時(shí)撞擊能量的概率分布研究[J];海岸工程;1996年01期

8 黃培基,胡澤建;膠州灣雙峰海浪頻譜的表示[J];海洋學(xué)報(bào)(中文版);1988年05期

9 黃培基，陳雪英，胡澤建;雙峰譜型海浪的統(tǒng)計(jì)性質(zhì)[J];海洋學(xué)報(bào)(中文版);1995年06期

10 蘇洪彬,熊福泉;大連港大窯灣港區(qū)總平面布置及其特點(diǎn)[J];水運(yùn)工程;1993年12期

相關(guān)博士學(xué)位論文 前2條

1 王崗;不同動(dòng)力因素引起的港灣振蕩問題研究[D];大連理工大學(xué);2010年

2 馬玉祥;基于連續(xù)小波變換的波浪非線性研究[D];大連理工大學(xué);2010年

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