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、入滲強度和滲透性、介質(zhì)場長深比和勢匯等因素,國內(nèi)外的研究學(xué)者針對這些影響因素和系統(tǒng)水動力特征方面做了諸多針對研究。在區(qū)域地下水流長途徑的流動過程中,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;水庫蓄水抬升河谷區(qū)地表水水位,系統(tǒng)的勢匯條件發(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)國內(nèi)外地下水流系統(tǒng)理論研究的基礎(chǔ)上,通過對系統(tǒng)的影響因素、地質(zhì)原型的分析,選擇褶皺類型系統(tǒng)作為試驗概化原型。通過概化地形、勢匯這兩個最為主要的控制因素,基于室內(nèi)砂槽模型試驗,對濃度和地表水水位變化過程進行物理模擬,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)的流線向下移動明顯,淺層局部流線下移不明顯,局部系統(tǒng)與區(qū)域系統(tǒng)的分界線處存在濃度梯度。區(qū)域系統(tǒng)內(nèi)水質(zhì)點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)域排泄點的排泄量占比從53.20%下降到37.20%。(2)在試驗Ⅰ-2模擬的水流系統(tǒng)中,共存在3個駐點,分別為在(0,0)和(100,0)位置的兩個區(qū)域駐點和在(60.1,35.1)附近的局部駐點SP。(3)液體粘滯系數(shù)增加對滲流速度的影響大于密度的影響,密度流中水質(zhì)點的滲流速度較淡水明顯增大。單位重量液體在地表位置進入至最低位置時,水頭損失?將會增大。(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)的流線向上偏移,屬于深部區(qū)域系統(tǒng)的流線變化不明顯。在排泄區(qū)附近,淺層區(qū)域系統(tǒng)和局部系統(tǒng)的流線變化特征相似。區(qū)域系統(tǒng)內(nèi)1號流線上質(zhì)點的平均滲流速度降低29.26%,局部系統(tǒng)L2中5號流線上質(zhì)點平均滲流速度增加18.5%,局部系統(tǒng)L3中6號流線上質(zhì)點平均滲流速度減小13.40%。區(qū)域排泄點的排泄量減少,局部排泄點的排泄量增加。(5)排泄點地表水水位抬升,對排泄點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：2084642