The effects of subcropping on
groundwater discharge to a stream.
Lensyl Urbano
(last update: 6/10/4)
Publications:
Urbano, L.D., Waldron, B.,
Larsen, D., and Shook, H., in
press.
Groundwater–surfacewater interactions at the transition of an aquifer
from unconfined to confined, Journal of Hydrology (available online)
(pdf preprint)
The following series of simulations demonstrate the effect of
hydrogeology, specifically the subcropping of a clay unit such as at
the edge of a shallow sedimentary basin, on the groundwater discharge
pattern to a stream flowing perpendicular to the stream.
Figure1. The generic model domain is shown. The two
streams crossing the top are for symmetry.
Below, are shown a series of simulations where different properties are
varied.
0) No
rivers.
Water table and capture zones with no river present.
1) Hydraulic
conductivity contrast.
Varying hydraulic conductivity
contrast between clay and aquifer by changing the conductivity of the
clay.
2)
Recharge Rate
Changing the recharge rate.
3)
Anisotrophy
Anisotrophy of the hydraulic units, where Ka is greater than Kc.
4) Non-Uniform confining unit
properties
Lieaner and Log decreases in confining unit conductivity from the edge
of the basin to the edge of the confining unit.
5) Basin
Dimensions