2019 | OriginalPaper | Chapter
7. Groundwater Morphology
Authors : Bernward Hölting, Wilhelm G. Coldewey
Published in: Hydrogeology
Publisher: Springer Berlin Heidelberg
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Abstract
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Groundwater level represents the upper boundary surface of a groundwater body.
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Groundwater longitudinal section shows the section through a groundwater body normal to its lines of equal hydraulic head (The groundwater longitudinal section often corresponds to a good approximation of a vertical section along a flow-line of the groundwater level).
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Hydraulic head (i.e. hydraulic pressure head) is the sum of the geodetic height and pressure head for a point in an observed groundwater body.
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Total hydraulic head gradient is the gradient of the hydraulic/piezometric heads between two measuring points.
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Piezometric surface describes the surface of all hydraulic heads of a groundwater level/surface from the geometric location of the endpoints (The general morphological designations can be used for the description of the piezometric surface, e.g. groundwater depression).
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Groundwater equipotential lines (also known as groundwater contour lines) are lines of equal elevation of a piezometric surface.
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Groundwater gradient consists of the gradients of the piezometric surface.
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Groundwater flow lines represent an idealized movement path of groundwater particles in the potential field of a groundwater body (Groundwater flow lines are perpendicular to the potentiometric surface of a groundwater body).
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Direction of groundwater current (also called direction of groundwater flow) takes place in the direction of the groundwater flow lines.
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Potentiometric surface of a groundwater body is the geometric location of all points in the observed groundwater body with the same total hydraulic head (Applies only with negligible differences in density).
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Equipotential line corresponds to the intersection line between the potentiometric surface of a groundwater body and the groundwater longitudinal section. It is an imaginary line at right angles to the groundwater flow line (Fig. 15.10).