本文關(guān)鍵詞： 環(huán)境工程 阻隔效應(yīng) Visual Modflow 水系連通 濕地 公路建設(shè)　出處：《公路交通科技》2017年11期 　論文類型：期刊論文

【摘要】：以延邊地區(qū)琿烏高速公路八家子路段草炭土沼澤濕地作為目標(biāo)研究區(qū),通過現(xiàn)場勘探試驗(yàn),探明了該路段的地層分布情況,通過現(xiàn)場抽水試驗(yàn)和示蹤試驗(yàn),確定了相關(guān)的水文地質(zhì)參數(shù)。并在此基礎(chǔ)上,根據(jù)研究區(qū)水文地質(zhì)特征,利用Visual Modflow將模擬區(qū)垂向概化為3層;根據(jù)抽水試驗(yàn)計(jì)算結(jié)果,并通過模型識(shí)別調(diào)參,最后確定模型區(qū)的平均導(dǎo)水系數(shù)為141 m2/d,平均釋水系數(shù)為2.61×10-4,給水度為0.3,孔隙度為0.6。建立了基于數(shù)值模擬的地下水水流模型和地下水溶質(zhì)遷移模型,分析了公路建設(shè)對(duì)濕地水系連通性所產(chǎn)生的阻隔效應(yīng);并對(duì)有無公路情況下地下水水位、地下水流場變化及公路覆蓋區(qū)地下水流量的變化進(jìn)行對(duì)比。研究結(jié)果表明,在有公路情況下,導(dǎo)致公路北側(cè)水頭普遍高于南側(cè),路基兩側(cè)地下水水位差較無公路時(shí)增加了0.5 m左右,可見公路建設(shè)對(duì)地下水流產(chǎn)生了一定的影響;另外,公路覆蓋區(qū)流量較無公路時(shí)減小了60%左右,尤其是公路覆蓋區(qū)南側(cè)的流量較無公路時(shí)減少了70%左右。同時(shí),以氮元素為對(duì)象進(jìn)行地下水溶質(zhì)遷移模擬,預(yù)測公路建設(shè)對(duì)濕地溶質(zhì)遷移所產(chǎn)生的影響,研究結(jié)果表明,在有公路情況下,公路兩側(cè)的濃度分布出現(xiàn)了濃度差,公路上游部分區(qū)域溶質(zhì)濃度較無公路情況下較大,可見公路建設(shè)對(duì)濕地區(qū)溶質(zhì)遷移產(chǎn)生了明顯的阻隔效應(yīng)。
[Abstract]:Taking the peat marsh wetland of Bajiazi section of Huibian Expressway in Yanbian area as the target research area, the stratigraphic distribution of the section is proved by field exploration test, and the field pumping test and tracer test are carried out. The relevant hydrogeological parameters are determined. Based on the hydrogeological characteristics of the study area, the vertical direction of the simulated area is generalized into three layers by using Visual Modflow, and the parameters are identified by the model according to the calculated results of the pumping test. Finally, the average conductivity of the model area is 141m2 / d, the average water release coefficient is 2.61 脳 10 ~ (-4), the water supply degree is 0.3, and the porosity is 0.6. The groundwater flow model and the groundwater solute transport model based on numerical simulation are established. This paper analyzes the barrier effect of highway construction on the connectivity of wetland water system, and compares the changes of groundwater level, groundwater flow field and groundwater flow in highway coverage area with or without highway. Under the condition of highway, the water head on the north side of the highway is generally higher than that on the south side, and the groundwater level difference between the two sides of the roadbed increases by about 0.5 m compared with that when there is no highway. It can be seen that the construction of the highway has a certain influence on the groundwater flow. The discharge of highway overlay area is reduced by about 60%, especially that of the south side of highway coverage area is decreased by about 70% compared with that without highway. At the same time, the solute migration of groundwater is simulated with nitrogen element as the object. The influence of highway construction on wetland solute migration is predicted. The results show that the concentration distribution on both sides of the highway is different, and the concentration of solute in the upstream part of the highway is larger than that in the case of no highway. It can be seen that highway construction has an obvious barrier effect on solute migration in wet areas.
【作者單位】： 廣西師范大學(xué)環(huán)境與資源學(xué)院;北京師范大學(xué)水科學(xué)研究院;
【基金】：交通運(yùn)輸部西部交通科技建設(shè)項(xiàng)目(20113186701290) 廣西師范大學(xué)重點(diǎn)項(xiàng)目(2014ZD007)
【分類號(hào)】：TV213.4;U412.2

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本文編號(hào)：1528608