【摘要】：含沙量是反應泥沙運動的重要物理量,了解海域含沙量分布變化特征對于認識和掌握泥沙運動規(guī)律具有重要的理論意義。而對于近岸灘涂海域,作為海域泥沙補給的重要來源之一,灘涂的圍墾可能導致近海海域水動力條件及海相泥沙輸入的改變,最終對海域含沙量產(chǎn)生深遠影響。因此,研究灘涂海域含沙量對灘涂圍墾的響應也是十分必要的。本文根據(jù)2011年冬季、2012年夏季及2014年秋季實測水沙資料,通過比較、歸納等方法分析了大目涂海域含沙量的潮周期變化、季節(jié)差異、空間分布特征并探討了其形成原因。應用MIKE21建立波流共同作用的二維水沙耦合模型,分別模擬了大目涂海域原始、lm等深線圍墾、3m等深線圍墾后的懸沙場分布情況,并對模擬結(jié)果給予了分析與解釋。研究結(jié)果表明:大目涂海域潮流以順時針旋轉(zhuǎn)流為主,近岸受地形影響呈一定的往復性,潮流流向基本與岸線走向一致,近岸落潮流占優(yōu)。海域潮動力分布具有“近岸小、外海大,北部小、南部大,冬季小、夏季大”的特點。駐波特性顯著。大目涂海域近岸與中部海域含沙量的潮周期變化以無峰型為主,遠岸海域呈明顯的單峰型,僅近岸南部海域為雙峰型。近岸海域漲、落潮含沙量均值漲潮期多大于落潮期,遠岸海域則多出現(xiàn)落潮期大于漲潮期的現(xiàn)象。無峰型和雙峰型的海域含沙量垂梯度向隨流變化顯著,單峰型海域則表現(xiàn)為“落潮含沙量高、垂向梯度大,漲潮含沙量小、垂向梯度小”的特點。冬季含沙量剖面形態(tài)呈“準直線型”、秋季呈“斜線型”、夏季呈“指數(shù)型”。按lm等深線和3m等深線圍墾灘涂未改變海域含沙量分布的基本格局,但對近岸海域含沙量影響較大,中部海域次之。其中l(wèi)m等深線圍墾使海域含沙量變幅最大達13%,3m等深線圍墾對應的含沙量變幅最大為26%。大潮期含沙量變化普遍大于小潮期,冬季含沙量變化明顯,夏季工程影響小于2%,暫可忽略。
[Abstract]:Sediment concentration is an important physical quantity reflecting sediment movement. It is of great theoretical significance to understand and master the law of sediment movement by understanding the characteristics of sediment concentration distribution in sea area. As one of the important sources of sediment recharge, the reclamation of tidal flat may lead to the change of hydrodynamic condition and marine sediment input in the offshore area, which will have a far-reaching effect on the sediment content in the sea area. Therefore, it is necessary to study the response of sediment content in tidal flat area to tidal flat reclamation. Based on the measured data of water and sediment in the winter of 2011, summer of 2012 and autumn of 2014, the tidal cycle variation, seasonal difference and spatial distribution characteristics of sediment concentration in the large area are analyzed by means of comparison and induction, and the reasons for its formation are discussed. A two-dimensional coupled model of water and sediment interaction between waves and currents is established by using MIKE21. The distribution of suspended battlefield after the reclamation of the large grain-coated sea area, the lm isobath reclamation and the 3m isobath reclamation is simulated, and the simulation results are analyzed and explained. The results show that the main tidal current in the area is clockwise rotating current, the inshore is affected by topography, the direction of tidal current is basically consistent with the trend of shoreline, and the inshore tidal current is dominant. The tidal dynamic distribution in the sea area is characterized by "small inshore, large offshore, small northern, southern, small winter and large summer". The standing wave characteristic is remarkable. The tidal cycle variation of the near shore and the middle part of the sea area is dominated by the non-peak type, the far shore sea area is obviously single peak type, and only the southern coastal area is of the double peak type. In the coastal waters, the mean value of the sediment content in the falling tide is larger than that in the lower tide, and the lower tide is larger than the high tide in the far shore. The vertical gradient of sediment concentration in the non-peak and bimodal sea areas varies significantly with the current, while the single-peak sea area is characterized by "high sediment content in the falling tide, large vertical gradient, small sediment content in the high tide and small vertical gradient". The shape of sediment content profile in winter is "quasi-linear", "diagonal" in autumn and "exponential" in summer. The basic pattern of sediment concentration distribution in the coastal area has not been changed according to the lm isobath and 3m isobath reclamation tidal flat, but it has a great influence on the sediment content in the coastal area, followed by the middle sea area. The maximum variation of sediment content in the sea area by lm isobath reclamation is as high as 13 ~ 3 m. The maximum range of sediment content is 26m for the reclamation of isobath with lm isobath. The variation of sediment content in spring tide period is generally greater than that in low tide period, and the change of sediment content in winter is obvious. The influence of summer engineering is less than 2, which can be ignored temporarily.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P748;TV148

【參考文獻】

相關(guān)期刊論文 前10條

1 陳斌;劉健;高飛;;萊州灣懸沙輸運機制研究[J];水科學進展;2015年06期

2 張二鳳;陳沈良;谷國傳;楊海飛;王如生;;長江口北支懸沙濃度及輸移的時空變化[J];海洋學報;2015年09期

3 周鴻權(quán);孫昭晨;李伯根;武小勇;鞏明;楊輝;;浙江象山港海域懸沙濃度分布變化及其水動力影響分析[J];海洋通報;2014年06期

4 匡翠萍;戚健文;蔣茗韜;顧杰;;泥沙輸運與海床演變對曹妃甸港口工程的響應特征[J];同濟大學學報(自然科學版);2014年12期

5 匡翠萍;錢從銳;姚凱華;顧杰;;潮流與泥沙輸運對黃驊港工程的響應分析[J];同濟大學學報(自然科學版);2014年10期

6 戚健文;匡翠萍;蔣茗韜;鄧凌;霍蕊;馬震;;曹妃甸港口工程進展及其三維潮流場響應特征研究[J];水動力學研究與進展A輯;2014年03期

7 劉艷霞;黃海軍;楊曉陽;;基于遙感反演的萊州灣懸沙分布及其沉積動力分析[J];海洋學報(中文版);2013年06期

8 邢飛;汪亞平;高建華;鄒欣慶;;江蘇近岸海域懸沙濃度的時空分布特征[J];海洋與湖沼;2010年03期

9 王海龍;李國勝;;黃河入海泥沙在渤海中懸移輸送季節(jié)變化的數(shù)值研究[J];海洋與湖沼;2009年02期

10 尹小玲;張紅武;任杰;胡德超;;珠江口虎門水域洪季大潮的水沙特點分析[J];水利學報;2009年02期

相關(guān)會議論文 前2條

1 黃惠明;王義剛;藍尹余;;杭州灣懸浮泥沙濃度分布及其探討[A];第十四屆中國海洋（岸）工程學術(shù)討論會論文集（上冊）[C];2009年

2 王崇浩;曹文洪;;三維水動力泥沙輸移模型及應用[A];中國水力發(fā)電工程學會水文泥沙專業(yè)委員會第七屆學術(shù)討論會論文集（上冊）[C];2007年

相關(guān)博士學位論文 前1條

1 堵盤軍;長江口及杭州灣泥沙輸運研究[D];華東師范大學;2007年

相關(guān)碩士學位論文 前1條

1 馮沈科;舟山螺頭水道冬季潮流懸沙特性及其數(shù)值模擬[D];浙江大學;2012年

，

本文編號：2333818