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21.
G. L. Geernaert 《Boundary-Layer Meteorology》2002,105(3):433-450
In order to apply Monin–Obukhov similarity theory to estimatethe profiles of mean quantities and surface fluxes from bulk meteorological parameters, the assumptions of homogeneityand stationarity must be valid. Unfortunately, in coastal zones as well as many other regions of interest, theseassumptions are often violated. In this paper, an extension to the theory is presented that considers systematically varyingstate variables. Along-wind variations of windspeed, atmospheric stratification, and roughness are examined with respectto their relative importance to momentum flux divergence, and the drag coefficient is shown to be systematicallylower in coastal zones. For profiles of scalars, an analysis of the set of quasi-homogeneous terms is only speculated,and the relative importance for the terms will strongly depend on which scalar is of interest. 相似文献
22.
温纳偏置电测深法压制表层电性不均匀体影响的研究 总被引:4,自引:1,他引:4
巷道底板浮煤等电性不均匀体及厚度变化是造成煤矿井下电测深曲线畸变的主要因素。通过模型实验研究了温纳偏置电测保法压制浮煤等表层电性不均匀体影响的能力。用感度分析法讨论了表层电性不均匀体产生地电干扰的机制。实测结果表明,该方法改善了电测深曲线质量,有效地提高了电测深法地质应用效果。 相似文献
23.
关于大地电磁的静校正问题 总被引:16,自引:0,他引:16
本文从理论上严格地论述了大地电磁测深曲线静态位移的原理,简单介绍了目前国内外所采用的静校正方法,并着重分析了我们所用的压制表层电性不均匀干扰的办法及其效果。 相似文献
24.
Some achievements on the inhomogeneity test of climatological data series and some correlative conclusions were described,from which we concluded that it was very necessary to test the homogeneity of the Chinese climatological data series.Many techniques on this field developed by foreign experts are suitable for Chinese climatological series,and the main factors for the inhomogeneity of the Chinese climatological data are the relocation of stations and the change of instruments. 相似文献
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东秦岭深地震剖面上莫霍基本特征的研究 总被引:5,自引:2,他引:5
东秦岭深地震剖面上反映的华北、秦岭和扬子莫霍地震波组的特征具有明显差异。对莫霍地震波组特征的研究,指出秦岭壳幔过渡带的不均匀程度和厚度大于华北和扬子壳幔过渡带。受地壳均衡作用的影响,已形成的秦岭壳幔过渡带起了通常所说的“山根”作用。 相似文献
27.
The deep electrical structure of the Earth 总被引:1,自引:0,他引:1
R. G. Roberts 《Geophysical Journal International》1986,85(3):583-600
28.
Ferenc Ács 《Boundary-Layer Meteorology》2003,109(2):139-162
Transpiration Ev and bare soil evaporation Eb processes are comparatively analysed assuming homogeneous and inhomogeneous areal distributions of volumetric soil moisture content . For a homogeneous areal distribution of we use a deterministic model, while for inhomogeneous distributions a statistical-deterministic diagnostic surface energy balance model is applied. The areal variations of are simulated by Monte-Carlo runs assuming normal distributions of .The numerical experiments are performed for loam. In the experiments we used different parameterizations for vegetation and bare soil surface resistances and strong atmospheric forcing. According to the results theEv()-Eb() differences are great, especially in dry conditions. In spite of this, the available energy flux curves of vegetation Av() and bare soil Ab() surfaces differ much less than the Ev() and Eb() curves. The results suggest that Ev is much more non-linearly related to environmental conditions than Eb. Both Ev and Eb depend on the distribution of , the wetness regime and the parameterization used. With the parameterizations, Eb showed greater variations than Ev. These results are valid when there are no advective effects or mesoscale circulation patterns and the stratification is unstable. 相似文献
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