本文選題：水化學(xué)特征 + 污染現(xiàn)狀評價(jià)　； 參考：《成都理工大學(xué)》2015年碩士論文

【摘要】：成都是我國重要的商品糧生產(chǎn)基地,也是四川人口最稠密、經(jīng)濟(jì)最發(fā)達(dá)的地區(qū)。成都市總面積12121平方公里,紅層區(qū)面積達(dá)4200km2,占全市面積近1/3,覆蓋11個(gè)區(qū)(市)縣的94個(gè)鄉(xiāng)(鎮(zhèn))。然而在成都紅層地區(qū),由于地質(zhì)以及水文、氣象等因素的影響,水土涵養(yǎng)條件差,水資源短缺,地下水是該區(qū)的主要水源之一。因此深入研究成都紅層區(qū)地下水的水化學(xué)特征,水文地球化學(xué)成因,污染現(xiàn)狀及污染成因?qū)Τ啥技t層地區(qū)地下水合理開發(fā)及可持續(xù)利用具有重要意義。本次研究以成都市紅層丘陵區(qū)為研究區(qū),以地下水系統(tǒng)理論為指導(dǎo),以野外水文地質(zhì)調(diào)查和水樣采取為基礎(chǔ),綜合運(yùn)用水文地質(zhì)學(xué)、水文地球化學(xué)等原理,采用定性分析和定量計(jì)算相結(jié)合的方法,開展了成都市紅層地下水化學(xué)特征及污染成因的研究。得出以下幾點(diǎn)認(rèn)識:1、成都紅層地區(qū)淺層地下水的水化學(xué)類型以HCO3-Ca和HCO3-Ca?Mg型水為主,所采集水樣中也存在HCO3?SO4-Ca及HCO3?SO4-Na兩種水化學(xué)類型。風(fēng)化裂隙水、層間承壓水及溶蝕孔洞水三類地下水水化學(xué)類型較為相似均以HCO3-Ca或HCO3-Ca?Mg型水為主。2、以本區(qū)環(huán)境背景值的上限和《地下水質(zhì)量標(biāo)準(zhǔn)》中的三類水的水質(zhì)指標(biāo)為參考對照,利用單指標(biāo)污染指數(shù)評價(jià)法對本區(qū)的地下水污染現(xiàn)狀進(jìn)行了評價(jià)。評價(jià)結(jié)果表明研究區(qū)地下水污染主要集中于崇州市、大邑縣、浦江縣、新都區(qū)、青白江區(qū)及金堂縣等地,成都紅層區(qū)其余縣市均為未污染地區(qū)或輕度污染地區(qū)。3、利用PHREEQC軟件對殷家溝小流域地下水演化過程進(jìn)行了模擬,模擬結(jié)果表明導(dǎo)致小流域水化學(xué)組分發(fā)生變化的主要化學(xué)過程為方解石、白云石、石膏的沉淀作用,石英的溶解作用,CO2的溢出以及陽離子交換反應(yīng)。4、通過MODFLOW對殷家溝小流域污染物的遷移模擬發(fā)現(xiàn)污染的遷移范圍較小且污染物的濃度變化呈現(xiàn)周期性的變化規(guī)律。
[Abstract]:Chengdu is an important commodity grain production base in China. It is also the most densely populated and economically developed area in Sichuan. Chengdu has a total area of 12121 square kilometers and a red layer area of 4200 km2, accounting for nearly one third of the city's total area, covering 94 townships (towns) in 11 districts (cities) and counties. However, due to the influence of geology, hydrology, meteorology and other factors, soil and water conservation conditions are poor, water resources are short, and groundwater is one of the main water sources in the red bed area of Chengdu. Therefore, it is of great significance to study the hydrochemical characteristics, hydrogeochemical causes, pollution status and pollution causes of groundwater in the red bed area of Chengdu for the rational development and sustainable utilization of groundwater in the red bed area of Chengdu. This study takes the red bed hilly area of Chengdu as the research area, takes the theory of groundwater system as the guidance, takes the field hydrogeology survey and the water sample adoption as the foundation, synthetically applies the principles of hydrogeology, hydrogeochemistry and so on. By combining qualitative analysis with quantitative calculation, the chemical characteristics and pollution causes of red bed groundwater in Chengdu were studied. It is found that the main hydrochemical types of shallow groundwater in the red bed area of Chengdu are HCO3-Ca and HCO3-Ca?Mg type water, and HCO3?SO4-Ca and HCO3?SO4-Na are also found in the collected water samples. Weathered fissure water, The chemical types of groundwater in interlayer confined water and dissolved pore water are similar to each other in HCO3-Ca or HCO3-Ca?Mg type water. The upper limit of environmental background value in this area and the water quality index of three types of groundwater in groundwater quality Standard are taken as reference control. The present situation of groundwater pollution in this area was evaluated by single index pollution index method. The results show that groundwater pollution is mainly concentrated in Chongzhou City, Dayi County, Pujiang County, Xindu District, Qingbaijiang District and Jintang County. The other counties and cities in the red bed area of Chengdu are non-polluted areas or mildly polluted areas. The evolution process of groundwater in Yinjiagou small watershed is simulated by PHREEQC software. The simulation results show that the main chemical processes leading to the change of the chemical composition of water in the small watershed are the precipitation of calcite, dolomite and gypsum. The CO _ 2 spillover and cation exchange reaction of quartz. Through the simulation of pollutant migration in Yinjiagou small watershed by MODFLOW, it is found that the range of pollution migration is small and the concentration of pollutants changes periodically.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X523

【引證文獻(xiàn)】

相關(guān)會(huì)議論文 前1條

1 程強(qiáng);周德培;寇小兵;;紅層軟巖地區(qū)公路建設(shè)中的主要巖土工程問題[A];第八次全國巖石力學(xué)與工程學(xué)術(shù)大會(huì)論文集[C];2004年

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本文編號：1788971