岩块尺度达西流非达西流流态转化研究
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摘要
通过室内渗透系数物理试验和数值模拟,对后寨典型岩溶小流域的岩溶化程度高低不同的两岩块试样达西流向非达西流流态转化展开研究。运用CFP(管道流程序)准确捕捉到岩块试样达西流向非达西流流态转化的临界雷诺数、临界水力梯度、临界流速等参数阈值;采用Shoemaker模型与Forchheimer模型对非达西流态进行分析研究,结果发现,Shoemaker模型与Forchheimer模型的标准化残差均方根Normalized RMS分别为0.16和0.28,表明Shoemaker模型方法拟合效果要好于Forchheimer模型方法;在雷诺数计算分析中,Forchheimer模型方法中采用的特征直径比Shoemaker模型方法采用的平均空隙直径更加合理。
In order to studying ransition from the Darcian flow to non-Darcian flow of rock samples in different kartification degree of the Houzhaikarstic water system, the critical hydrodynamic thresholds of these two rock samples, such as critical Reynolds number, critical hydraulic gradient, and critical groundwater velocity, have been determined exactly by using the CFP(Conduit Flow Process)through the labortary experiment and the numierical simulation. The non-Darcy flow condition was also analyzed by Shoemaker model and Forchheimer model. The results are as follows. On the one hand, the Normalized RMS of the Shoemaker model and the Forchheimer model is 0.16 and 0.28. It shows that the former has better fitting effect that the latter. On the other hand, the characteristic diameter used in the Shoemaker model is more reasonable than the average void diameter used in the Shoemaker model.
In order to studying ransition from the Darcian flow to non-Darcian flow of rock samples in different kartification degree of the Houzhaikarstic water system, the critical hydrodynamic thresholds of these two rock samples, such as critical Reynolds number, critical hydraulic gradient, and critical groundwater velocity, have been determined exactly by using the CFP(Conduit Flow Process)through the labortary experiment and the numierical simulation. The non-Darcy flow condition was also analyzed by Shoemaker model and Forchheimer model. The results are as follows. On the one hand, the Normalized RMS of the Shoemaker model and the Forchheimer model is 0.16 and 0.28. It shows that the former has better fitting effect that the latter. On the other hand, the characteristic diameter used in the Shoemaker model is more reasonable than the average void diameter used in the Shoemaker model.
引文
[1]陈曦,彭稳,曹建华.典型峰林平原土壤有机碳储量和分布特征研究[J].科技通报,2012,28(2):167-173.
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[4]Pulido-Bosch A,Motyka J,Pulido-Leboeuf P,et al.Matrix hydrodynamic properties of carbonate rocks from the Betic Cordillera(Spain)[J].Hydrological processes,2004,18(15):2893-2906.
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[6]Zuber A,Motyka J.Matrix porosity as the most important parameter of fissured rocks for solute transport at large scales[J].Journal of Hydrology,1994,158(1):19-46.
[7]王腊春,史运良.非闭合流域岩溶水模型[J].水科学进展,1995,04:318-324.
[8]Motyka J,Pulido-Bosch A,Borczak S,et al.Matrix hydrogeological properties of Devonian carbonate rocks of Olkusz(Southern Poland)[J].Journal of Hydrology,1998,211(1):140-150.
[9]Rzonca B.Carbonate aquifers with hydraulically non-active matrix:a case study from Poland[J].Journal of hydrology,2008,355(1):202-213.
[10]Shoemaker W B,Cunningham K J,Kuniansky E L,et al.Effects of turbulence on hydraulic heads and parameter sensitivities in preferential groundwater flow layers[J].Water resources research,2008,44(3).
[11]Forchheimer P.,Hydraulik.Stuttgart,Germany:Teubner Verlagsgesellschaft,1930.
[12]Ahmed N,Sunada D K.Nonlinear flow in porous media[J].Journal of the Hydraulics Division,1969,95(6):1847-1858.
[2]Rovey C W.Assessing flow systems in carbonate aquifers using scale effects in hydraulic conductivity[J].Environmental geology,1994,24(4):244-253.
[3]Rovey C W,Cherkauer D S.Scale dependency of hydraulic conductivity measurements[J].Groundwater,1995,33(5):769-780.
[4]Pulido-Bosch A,Motyka J,Pulido-Leboeuf P,et al.Matrix hydrodynamic properties of carbonate rocks from the Betic Cordillera(Spain)[J].Hydrological processes,2004,18(15):2893-2906.
[5]Whitaker F F,Smart P L.Characterising scale-dependence of hydraulic conductivity in carbonates:Evidence from the Bahamas[J].Journal of Geochemical Exploration,2000,69:133-137.
[6]Zuber A,Motyka J.Matrix porosity as the most important parameter of fissured rocks for solute transport at large scales[J].Journal of Hydrology,1994,158(1):19-46.
[7]王腊春,史运良.非闭合流域岩溶水模型[J].水科学进展,1995,04:318-324.
[8]Motyka J,Pulido-Bosch A,Borczak S,et al.Matrix hydrogeological properties of Devonian carbonate rocks of Olkusz(Southern Poland)[J].Journal of Hydrology,1998,211(1):140-150.
[9]Rzonca B.Carbonate aquifers with hydraulically non-active matrix:a case study from Poland[J].Journal of hydrology,2008,355(1):202-213.
[10]Shoemaker W B,Cunningham K J,Kuniansky E L,et al.Effects of turbulence on hydraulic heads and parameter sensitivities in preferential groundwater flow layers[J].Water resources research,2008,44(3).
[11]Forchheimer P.,Hydraulik.Stuttgart,Germany:Teubner Verlagsgesellschaft,1930.
[12]Ahmed N,Sunada D K.Nonlinear flow in porous media[J].Journal of the Hydraulics Division,1969,95(6):1847-1858.