Manual of Applied Field Hydrogeology
Providing plenty of practical examples, this hands-on guide offers actual procedures and real-world decisions that will help you to stay leagues ahead in field hydrogeology.
TABLE OF CONTENTS Manual of Applied Field Hydrogeology
Glossary
- acquisition
- First of the three divisions of geophysical exploration (data acquisition). The process of designing geophysical surveys recording and recording geophysical measurements.
- aggrading
- A stream reach building up sediments in its channel or floodplain by being supplied more sediment than it can carry. It is a stream reach characterized by active sedimentation.
- amplitude
- Maximum departure of a wave from the average value (Sheriff 1991).
- anisotropic
- See isotropy
- aplite
- A dike rock of granitic composition than has very fine-grained crystals. The appearance is usually very felsic or light colored.
- approach velocity (V a )
- As groundwater moves towards the well screen the velocity increases. If the velocity exceeds a critical limit, finer particles from the aquifer will become entrained and move into the gravel packing. This critical limit is known as the approach velocity (V a ). It is not the same as an entrance velocity because it is specific discharge at the damage zone of the borehole wall.
- aquicludes
- Units of extreme low permeability that form barriers to fluid flow. They are usually six orders of magnitude or less than surrounding units.
- aquifer
- A formation, part of a formation, or group of formations that contain sufficient saturated permeable material to yield significant quantities of water to wells or springs.
- aquifer hydraulics
- Evaluation of aquifer properties by stressing the aquifer and measuring and analyzing the response. Stressing the aquifer may be conducted through pumping tests or slug tests in the...
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