本文選題：電法 + 海水入侵�。� 參考：《華僑大學(xué)》2014年碩士論文

【摘要】：隨著沿海城市日新月異的發(fā)展，人類賴以生存的地下水資源遭到過(guò)度開(kāi)采，致使沿海地區(qū)均有不同程度的海水入侵現(xiàn)象發(fā)生，這樣便使得本就缺乏的淡水資源受到海水的污染。因此，對(duì)海水入侵的規(guī)律進(jìn)行深入研究，并在此基礎(chǔ)上提出防治措施，已迫在眉睫。 本文在廣泛閱讀國(guó)內(nèi)外關(guān)于海水入侵的研究成果基礎(chǔ)上，總結(jié)前人所用研究方法和工具的優(yōu)缺點(diǎn)，確定本文采用室外測(cè)試、室內(nèi)試驗(yàn)和數(shù)值模擬相結(jié)合的綜合研究方法。首先對(duì)海水入侵標(biāo)準(zhǔn)的進(jìn)行了對(duì)比探討，確定室外測(cè)量使用井水電導(dǎo)率作為判別指標(biāo)，并將標(biāo)準(zhǔn)初步定為1700us；而室內(nèi)試驗(yàn)利用土體的電阻率作為判別指標(biāo)，分別將砂土和粘土的判別標(biāo)準(zhǔn)確定為50·m和20·m。根據(jù)所確定的指標(biāo)測(cè)試研究了泉州灣典型區(qū)域海水入侵的現(xiàn)狀，并繪制了海水入侵現(xiàn)狀圖。 其次應(yīng)用高密度電法完成室內(nèi)海水入侵試驗(yàn)，定量地研究了完整潮汐作用下海水入侵的規(guī)律，得到砂-粘土夾層中海水入侵的規(guī)律：①隨著潮漲潮落，海水先發(fā)生入侵而后開(kāi)始發(fā)生回退現(xiàn)象；②砂土層中海水入侵的速度大于粘土層，同層砂土中不同深度各點(diǎn)海水入侵程度不同；③海水入侵具有累積效應(yīng)，，第二次潮汐海水入侵的程度大于第一次潮汐。 然后通過(guò)數(shù)值模擬對(duì)試驗(yàn)進(jìn)行了一定的彌補(bǔ)，進(jìn)一步探討了土體各個(gè)因素對(duì)海水入侵結(jié)果的影響，確定影響海水入侵距離的因素為土體飽和導(dǎo)水率、體積含水率、彌散系數(shù)和擴(kuò)散系數(shù)，其中擴(kuò)散系數(shù)是影響入侵的最主要因素，而飽和導(dǎo)水率和彌散系數(shù)為影響入侵的重要因素，相對(duì)于其他因素而言，土體飽和體積含水率對(duì)入侵距離的影響較小，不屬于主要因素；數(shù)值模擬結(jié)果表明：水位差對(duì)海水入侵的速度也有一定的影響，水位差的絕對(duì)值越大，其發(fā)生海水入侵或海水回退的速度越大，處于海平面及淡水水位以下的土層，發(fā)生海水入侵速度較快，但其回退速度也快，處于海平面以上，淡水水位以下的土層發(fā)生海水入侵容易，但回退相對(duì)較難。 最后利用建立海水入侵?jǐn)?shù)值模型，對(duì)真實(shí)地層下泉州灣典型區(qū)域未來(lái)三年海水入侵程度進(jìn)行了數(shù)值模擬，預(yù)測(cè)海水入侵的變化規(guī)律，為泉州灣海水入侵的防治工作提供指導(dǎo)。
[Abstract]:With the rapid development of coastal cities, the groundwater resources on which human beings depend for survival have been overexploited, resulting in different degrees of seawater intrusion in coastal areas, which makes the freshwater resources that are scarce are polluted by sea water.Therefore, it is urgent to study the law of seawater intrusion and put forward the prevention and cure measures.On the basis of extensive reading of the domestic and foreign research achievements on seawater intrusion, this paper summarizes the advantages and disadvantages of the research methods and tools used by the predecessors, and determines that this paper adopts a comprehensive research method which combines outdoor test, indoor test and numerical simulation.Firstly, the seawater intrusion standard is compared and discussed, and the well water conductivity is determined as the discriminant index for outdoor measurement, and the standard is preliminarily determined as 1700us.However, the resistivity of soil is used as the discriminant index in indoor test.The discriminant criteria of sand and clay are determined to be 50 m and 20 m respectively.The present situation of seawater intrusion in typical area of Quanzhou Bay was studied according to the determined indexes, and the current situation map of seawater intrusion was drawn.Secondly, the indoor seawater intrusion test was completed by using high-density electric method, and the law of seawater intrusion under the action of complete tide was quantitatively studied. The rule of seawater intrusion in sand and clay intercalation was obtained, and the law of seawater intrusion in sand and clay intercalation was obtained with the tide rising and falling.The seawater intrusion in sand layer is faster than that in clay layer, and the seawater intrusion degree is different at different depth in the same layer sand soil.The second tidal intrusion is greater than the first tidal intrusion.Then the experiment is compensated by numerical simulation, and the influence of various soil factors on the result of seawater intrusion is further discussed. The factors that affect the distance of seawater intrusion are the saturated water conductivity of soil and the volume water content.Diffusion coefficient and diffusion coefficient, among which diffusion coefficient is the most important factor, saturation water conductivity and diffusion coefficient are important factors affecting invasion, compared with other factors,The numerical simulation results show that the difference of water level has a certain influence on the velocity of seawater intrusion, and the absolute value of the difference of water level is larger.The higher the speed of seawater intrusion or seawater retrogression is, the faster the seawater intrusion occurs in the soil layer below sea level and fresh water level, but the faster the return speed is above sea level.Seawater intrusion is easy to occur in the soil layer below the fresh water level, but it is relatively difficult to retreat.At last, a numerical model of seawater intrusion is established to simulate the degree of seawater intrusion in the typical area of Quanzhou Bay in the next three years, to predict the variation of seawater intrusion, and to provide guidance for the prevention and treatment of seawater intrusion in Quanzhou Bay.
【學(xué)位授予單位】：華僑大學(xué)
【學(xué)位級(jí)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 劉青勇,耿樹(shù)德,董廣清,寧丕海,任丕其;王河流域防治海水入侵的攔蓄補(bǔ)源及調(diào)度技術(shù)研究[J];水利水電技術(shù);1997年08期

2 陳娟;李欲如;;潮汐對(duì)沿海潛水水位的影響研究[J];水利科技與經(jīng)濟(jì);2005年12期

3 鐘啟明;陳建生;陳亮;;濱海地區(qū)海水入侵的一種測(cè)定方法[J];水利水電科技進(jìn)展;2007年01期

4 劉青勇,董廣清,耿樹(shù)德,武曉峰,呂賢弼,唐杰;淡水帷幕防治海(咸)水入侵的物理模擬試驗(yàn)研究[J];水利學(xué)報(bào);1998年02期

5 薛禹群,謝春紅,吳吉春;海水入侵研究[J];水文地質(zhì)工程地質(zhì);1992年06期

6 唐心強(qiáng);董潔;大年邦雄;李靜;;電法探查海岸帶含水層咸淡水界面的調(diào)查研究[J];水文地質(zhì)工程地質(zhì);2007年01期

7 李振函;張春榮;朱偉;;日照市沿海地區(qū)海水入侵現(xiàn)狀與分析[J];水文地質(zhì)工程地質(zhì);2009年05期

8 姜振蛟;卞建民;g魎

本文編號(hào)：1737925