EAS446lec7 - EAS 44600 Groundwater Hydrology Lecture 7:...

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EAS 44600 Groundwater Hydrology Lecture 7: Heterogeneity and Anisotropy Dr. Pengfei Zhang Heterogeneity and Anisotropy Hydrologic properties (hydraulic conductivity, specific storage, etc.) may vary through space within a geological formation. The spatial variation of hydraulic properties is called heterogeneity . There are many types of heterogeneous configurations in our geological environments. A good example is layered heterogeneity , common in sedimentary rocks and unconsolidated lacustrine and marine deposits. If the geologic unit has the same hydrologic properties at all locations, this unit is homogeneous . Hydrologic properties may also change with the direction of measurement at any given point within a geologic formation. This dependence of hydrologic properties on the direction of measurement is termed anisotropy . On small scales, the cause of anisotropy is the shape and orientation of minerals in sedimentary rocks and unconsolidated sediments (Figure 7-1). On larger scales, anisotropy arises from layered heterogeneity (see discussion below). If the geologic unit has the same hydrologic properties at all directions, this unit is
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EAS446lec7 - EAS 44600 Groundwater Hydrology Lecture 7:...

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