本文選題：地下水流系統(tǒng) + 砂槽模型　； 參考：《成都理工大學(xué)》2017年碩士論文

【摘要】：地下水流系統(tǒng)發(fā)育受控于地形、入滲強(qiáng)度和滲透性、介質(zhì)場(chǎng)長(zhǎng)深比和勢(shì)匯等因素,國(guó)內(nèi)外的研究學(xué)者針對(duì)這些影響因素和系統(tǒng)水動(dòng)力特征方面做了諸多針對(duì)研究。在區(qū)域地下水流長(zhǎng)途徑的流動(dòng)過(guò)程中,水-巖作用使得水流的濃度逐漸發(fā)生改變,介質(zhì)的滲透性發(fā)生變化;水庫(kù)蓄水抬升河谷區(qū)地表水水位,系統(tǒng)的勢(shì)匯條件發(fā)生變化,造成深部區(qū)域性地下水和淺層地下水的水動(dòng)力特征發(fā)生改變。目前極少有學(xué)者從區(qū)域性水流其自身特有的濃度特征和工程中地表水水位變化角度下考慮地下水流系統(tǒng)的變化研究。本論文在總結(jié)國(guó)內(nèi)外地下水流系統(tǒng)理論研究的基礎(chǔ)上,通過(guò)對(duì)系統(tǒng)的影響因素、地質(zhì)原型的分析,選擇褶皺類(lèi)型系統(tǒng)作為試驗(yàn)概化原型。通過(guò)概化地形、勢(shì)匯這兩個(gè)最為主要的控制因素,基于室內(nèi)砂槽模型試驗(yàn),對(duì)濃度和地表水水位變化過(guò)程進(jìn)行物理模擬,結(jié)合圖像處理技術(shù),分析系統(tǒng)的變化特征,得到以下結(jié)論。(1)隨著區(qū)域性水流濃度的升高,區(qū)域系統(tǒng)內(nèi)的流線(xiàn)向下移動(dòng)明顯,淺層局部流線(xiàn)下移不明顯,局部系統(tǒng)與區(qū)域系統(tǒng)的分界線(xiàn)處存在濃度梯度。區(qū)域系統(tǒng)內(nèi)水質(zhì)點(diǎn)的平均滲流速度降低,區(qū)域系統(tǒng)的循環(huán)流量減少。局部排泄點(diǎn)的排泄量由最初占比46.80%逐漸增加到63.80%,相應(yīng)的區(qū)域排泄點(diǎn)的排泄量占比從53.20%下降到37.20%。(2)在試驗(yàn)Ⅰ-2模擬的水流系統(tǒng)中,共存在3個(gè)駐點(diǎn),分別為在(0,0)和(100,0)位置的兩個(gè)區(qū)域駐點(diǎn)和在(60.1,35.1)附近的局部駐點(diǎn)SP。(3)液體粘滯系數(shù)增加對(duì)滲流速度的影響大于密度的影響,密度流中水質(zhì)點(diǎn)的滲流速度較淡水明顯增大。單位重量液體在地表位置進(jìn)入至最低位置時(shí),水頭損失?將會(huì)增大。(4)區(qū)域排泄河谷內(nèi)地表水水位抬升,造成屬于淺層局部和區(qū)域系統(tǒng)的流線(xiàn)向上偏移,屬于深部區(qū)域系統(tǒng)的流線(xiàn)變化不明顯。在排泄區(qū)附近,淺層區(qū)域系統(tǒng)和局部系統(tǒng)的流線(xiàn)變化特征相似。區(qū)域系統(tǒng)內(nèi)1號(hào)流線(xiàn)上質(zhì)點(diǎn)的平均滲流速度降低29.26%,局部系統(tǒng)L2中5號(hào)流線(xiàn)上質(zhì)點(diǎn)平均滲流速度增加18.5%,局部系統(tǒng)L3中6號(hào)流線(xiàn)上質(zhì)點(diǎn)平均滲流速度減小13.40%。區(qū)域排泄點(diǎn)的排泄量減少,局部排泄點(diǎn)的排泄量增加。(5)排泄點(diǎn)地表水水位抬升,對(duì)排泄點(diǎn)附近的地下水水位影響最為明顯,其直接影響為水力梯度的減小,造成各水流系統(tǒng)的流量發(fā)生變化。
[Abstract]:The development of groundwater flow system is controlled by topography, infiltration intensity and permeability, the ratio of medium field length to depth and potential sink, and so on. Domestic and foreign researchers have done a lot of research on these factors and the hydrodynamic characteristics of the system. In the course of regional groundwater flow, the water-rock interaction changes the concentration of water flow gradually, the permeability of medium changes, and the water level of surface water in the valley area is raised by reservoir, and the potential sink condition of the system changes. The hydrodynamic characteristics of deep regional groundwater and shallow groundwater are changed. At present, very few scholars consider the change of groundwater flow system from the angle of regional water concentration characteristics and surface water level variation in engineering. On the basis of summarizing the theoretical research of groundwater flow system at home and abroad, this paper selects the fold type system as the experimental generalization prototype through the analysis of the influence factors and geological prototype of the system. Based on the indoor sand tank model test, the variation process of concentration and surface water level is simulated physically by means of generalized terrain and potential sink, and the variation characteristics of the system are analyzed with image processing technology. The following conclusions are obtained: (1) with the increase of regional water concentration, the flow line in the regional system moves down obviously, but the local flow line in the shallow layer does not move down obviously, and there is a concentration gradient at the boundary between the local system and the regional system. The average percolation velocity of the water quality points in the regional system is decreased, and the circulating flow rate of the regional system is decreased. The amount of local discharge point gradually increased from 46.80% to 63.80%, and the proportion of local discharge point decreased from 53.20% to 37.20%. (2) in the flow system simulated in experiment 鈪，

本文編號(hào)：2084642