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Statistical comparisons of grain size characteristics, hydraulic conductivity, and porosity of barchan desert dunes to coastal dunes
Aeolian Research ( IF 3.3 ) Pub Date : 2020-02-07 , DOI: 10.1016/j.aeolia.2020.100576
Oliver M. Lopez , Michael C. Hegy , Thomas M. Missimer

Ancient dune sand environments in deserts and coasts are aquifers and hydrocarbon reservoirs that commonly have preserved high permeability (hydraulic conductivity). A paucity of research has been performed on variations in the distribution of permeability associated with the positions within the dunes and the differences between these patterns in desert and coastal dunes. A comparison of dune sand grain size and hydraulic properties of a desert barchan dune field in Saudi Arabia to a coastal dune field in Uruguay has revealed some important differences and similarities. The grain size characteristics show that the mean grain diameter was significantly lower in the barchan dune field compared to the coastal dune field (1.95–2.79 phi) and the sorting was better in the coastal dune field (0.40–0.66 phi). The skewness and kurtosis of the dune sands were not significantly different with the skewness <0.1 and the kurtosis near 1.0. No statistical differences based on dune position were found in the coastal dunes, but there were significant differences in position in the desert dunes. The porosity differed between the desert dunes and the coastal dunes with the mean values being 0.39 and 0.35 respectively. No significant porosity variation with dune position was found in either dune type. The coastal dunes had a significantly higher mean hydraulic conductivity of 25.3 m/d compared to the desert dunes of 9.32 m/d. The dune crests in the desert dunes had significantly higher hydraulic conductivity values compared to other locations in the dune profile.



中文翻译:

Barchan沙漠沙丘与沿海沙丘的粒度特征,水力传导率和孔隙率的统计比较

沙漠和海岸地区的古代沙丘环境是含水层和碳氢化合物储集层,通常保持较高的渗透率(水导率)。关于与沙丘中的位置有关的渗透率分布的变化以及沙漠和沿海沙丘中这些模式之间的差异的研究很少。将沙特阿拉伯的一个沙丘巴肯沙丘场与乌拉圭的一个沿海沙丘场的沙丘粒度和水力特性进行比较,发现了一些重要的区别和相似之处。晶粒度特征表明,与沿海沙丘场(1.95-2.79 phi)相比,巴肯沙丘场的平均粒径要低得多,而沿海沙丘场的平均粒径则更好(0.40-0.66 phi)。沙丘的偏度和峰度差异不显着,偏度<0.1且峰度接近1.0。在沿海沙丘上未发现基于沙丘位置的统计差异,但在沙漠沙丘中位置存在显着差异。沙漠沙丘和沿海沙丘之间的孔隙度不同,平均值分别为0.39和0.35。在两种沙丘类型中均未发现沙丘位置随孔隙度的明显变化。与沙漠沙丘的9.32 m / d相比,沿海沙丘的平均水力传导率为25.3 m / d明显更高。与沙丘剖面中的其他位置相比,沙漠沙丘中的沙丘波峰具有明显更高的水力传导率值。在沿海沙丘上未发现基于沙丘位置的统计差异,但在沙漠沙丘中位置存在显着差异。沙漠沙丘和沿海沙丘之间的孔隙度不同,平均值分别为0.39和0.35。在两种沙丘类型中均未发现沙丘位置随孔隙度的明显变化。与沙漠沙丘的9.32 m / d相比,沿海沙丘的平均水力传导率为25.3 m / d明显更高。与沙丘剖面中的其他位置相比,沙漠沙丘中的沙丘波峰具有明显更高的水力传导率值。在沿海沙丘上未发现基于沙丘位置的统计差异,但在沙漠沙丘中位置存在显着差异。沙漠沙丘和沿海沙丘之间的孔隙度不同,平均值分别为0.39和0.35。在两种沙丘类型中均未发现沙丘位置随孔隙度的明显变化。与沙漠沙丘的9.32 m / d相比,沿海沙丘的平均水力传导率为25.3 m / d明显更高。与沙丘剖面中的其他位置相比,沙漠沙丘中的沙丘波峰具有明显更高的水力传导率值。沙漠沙丘和沿海沙丘之间的孔隙度不同,平均值分别为0.39和0.35。在两种沙丘类型中均未发现沙丘位置随孔隙度的明显变化。与沙漠沙丘的9.32 m / d相比,沿海沙丘的平均水力传导率为25.3 m / d明显更高。与沙丘剖面中的其他位置相比,沙漠沙丘中的沙丘波峰具有明显更高的水力传导率值。沙漠沙丘和沿海沙丘之间的孔隙度不同,平均值分别为0.39和0.35。在两种沙丘类型中均未发现沙丘位置随孔隙度的明显变化。与沙漠沙丘的9.32 m / d相比,沿海沙丘的平均水力传导率为25.3 m / d明显更高。与沙丘剖面中的其他位置相比,沙漠沙丘中的沙丘波峰具有明显更高的水力传导率值。

更新日期:2020-02-07
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