本文選題：地下水　切入點(diǎn)：數(shù)值模擬　出處：《西南交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著改革開放的深入,我國(guó)現(xiàn)代化、城鎮(zhèn)化進(jìn)程加快,相伴而來(lái)的則是包括地下水環(huán)境質(zhì)量不斷惡化在內(nèi)的各種環(huán)境問題。目前我國(guó)地下水污染程度已十分嚴(yán)重,但比起地表水污染及大氣污染等易被關(guān)注的環(huán)境污染問題,在國(guó)內(nèi)人們重視的程度還遠(yuǎn)遠(yuǎn)不夠。由于地下水隱蔽性強(qiáng),自身流速慢,自凈能力差等特點(diǎn),在現(xiàn)有的技術(shù)條件下使人們很難套用修復(fù)地表水的技術(shù)對(duì)地下水污染進(jìn)行治理。本文以《巴中市某生活垃圾焚燒發(fā)電項(xiàng)目》為例,在收集、整理項(xiàng)目相關(guān)地質(zhì)、水文地質(zhì)資料的基礎(chǔ)上,選取CODcr作為模擬因子,建立了研究區(qū)域地下水溶質(zhì)運(yùn)移模型,并利用Visual MODFLOW求解,采用數(shù)值模擬的方法研究污染物的遷移過程。最后,假設(shè)項(xiàng)目遭遇突發(fā)事故,垃圾滲濾液下滲到含水層中,利用模擬預(yù)測(cè)出的CODcr在地下水系統(tǒng)的運(yùn)動(dòng)規(guī)律,設(shè)計(jì)PRB方案來(lái)修復(fù)污染水體。獲得的主要結(jié)論如下：1、通過分析研究目標(biāo)區(qū)域的地質(zhì)、水文地質(zhì)相關(guān)資料數(shù)據(jù),將研究區(qū)內(nèi)北側(cè)溝谷定義為河流邊界條件；對(duì)研究區(qū)域內(nèi)主要水文地質(zhì)條件進(jìn)行分析后,將其分為兩層結(jié)構(gòu),第一層為第四系粉質(zhì)粘土,第二層為中、強(qiáng)風(fēng)化砂巖含水層組,建立地下水流數(shù)值模型,并對(duì)模型進(jìn)行驗(yàn)證和識(shí)別。2、在地下水流數(shù)值模型基礎(chǔ)上,選取CODCr作為模擬因子,建立溶質(zhì)運(yùn)移模型,并用Visual MODFLOW求解。從預(yù)測(cè)結(jié)果來(lái)看,污染物由模型的污染源位置向模型北側(cè)溝谷運(yùn)移擴(kuò)散,CODcr污染羽面積隨著時(shí)間推移而變大。十年模擬期后,整個(gè)CODcr污染羽已經(jīng)擴(kuò)散至模型北側(cè)溝谷附近,其平均濃度已達(dá)到80mg/L,最大濃度為150mg/L。3、利用本文前面所模擬的污染羽狀圖及其項(xiàng)目相關(guān)的水文地質(zhì)資料和數(shù)據(jù),研究PRB技術(shù)修復(fù)方案。PRB反應(yīng)介質(zhì)采用石英砂、零價(jià)鐵及改性煤渣組成的復(fù)合介質(zhì),墻體結(jié)構(gòu)選用連續(xù)式滲透反應(yīng)墻。墻體主要設(shè)計(jì)參數(shù)如下：墻體長(zhǎng)度確定為40m,高度確定為5.7m,埋深確定為10.7m,厚度確定為0.6m；墻體與模型水平方向坐標(biāo)軸之間的夾角為52°,反應(yīng)層滲透系數(shù)為9.23×10-7m/s。最后,利用Visual MODFLOW軟件概化相關(guān)條件,驗(yàn)證PRB系統(tǒng)對(duì)地下水水質(zhì)修復(fù)效果。
[Abstract]:With the deepening of reform and opening up, the modernization of our country, the acceleration of urbanization process, accompanied by a variety of environmental problems, including the deterioration of groundwater environmental quality. At present, the degree of groundwater pollution in China has been very serious. However, compared with surface water pollution and air pollution and other environmental pollution problems that are easy to be concerned about, the degree of attention paid by people in China is far from enough. Because of the characteristics of strong concealment of groundwater, slow velocity of its own and poor self-purification ability, etc. Under the existing technical conditions, it is very difficult for people to apply the technology of surface water restoration to control the groundwater pollution. In this paper, taking the Project of Incineration and Power Generation of a Municipal solid waste in Bazhong City as an example, the relevant geology of the project is collected and sorted out. On the basis of hydrogeological data, CODcr is selected as the simulation factor, and the solute transport model of groundwater in the study area is established. The solution is solved by Visual MODFLOW, and the transport process of pollutants is studied by numerical simulation. If the project encounters a sudden accident, the landfill leachate seeps into the aquifer, and the movement law of CODcr in the groundwater system is predicted by the simulation. The main conclusions are as follows: 1. By analyzing the geological and hydrogeological data of the target area, the northern gully in the study area is defined as the river boundary condition. After analyzing the main hydrogeological conditions in the study area, it is divided into two layers: the first layer is quaternary silty clay, the second layer is medium and strong weathered sandstone aquifer group, and the numerical model of groundwater flow is established. The model is verified and identified. Based on the numerical model of groundwater flow, CODCr is selected as the simulation factor, and the solute transport model is established and solved by Visual MODFLOW. The pollution plume area of CODcr increased with the passage of time from the pollution source location of the model to the northern gully of the model. After a decade of simulation period, the whole CODcr pollution plume had spread to the north side of the model near the gully valley. The average concentration has reached 80 mg / L, and the maximum concentration is 150 mg / L. 3. Using the pollution plume map simulated in this paper and the hydrogeological data and data related to the project, the paper studies the remediation scheme of PRB technology. The reaction medium of PRB is quartz sand. A composite medium consisting of zero-valent iron and modified cinder, The main design parameters of the wall are as follows: the length of the wall is 40 m, the height is 5.7 m, the depth of the wall is 10.7 m, the thickness is 0.6 m, and the angle between the wall and the horizontal axis of the model is as follows. 52 擄, the permeation coefficient of the reaction layer is 9.23 脳 10 ~ (-7) m / s. Finally, Using Visual MODFLOW software to generalize the related conditions, the effect of PRB system on groundwater quality restoration is verified.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X523;X82

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本文編號(hào)：1609776