Department
of Earth Science |
Northeastern
Illinois University
PRINCIPLES
OF HYDROGEOLOGY
ESCI
337
Spring,
2004
Daily Objectives #27 (April
27, 2004)
Dr. Sanders
By the end of today's class, you should be able to do the following:
n Use
a corollary to Darcy's Law to calculate velocity of ground water flow
and travel times.
n Complete
Problem 3 at the end of Chapter 7 (parts a through d).
n Construct
a flow net for the "sand tank".
n Predict
how changes to these variables in the sand tank would affect flow:
Increase/decrease the pumping rate out of the bottom of the tank.
Increase/decrease the rate of flow into the top of the tank.
Change the
lake level by causing it to be lower/higher.
Use sand with
a higher/lower hydraulic conductivity.
Use
colder/hotter water.
Put more sand
in.
Change the
slope of the hillside.
Make the lake
larger by giving it a broader surface area.
n Use
Darcy's Law and your numerical ground water model to predict how
changes
in a ground water system will affect flow through the system. Do
this by altering variables one at a time, running the model, and then
examining the results. For each change (perturbation) to the
system, record both how the results
changed, and the degree of change (high, moderate, low).
After you are done with each variable, reset it to its original value
before changing the next variable. Examine the effects of changes
in the following variables: hydraulic conductivity, river levels
(higher levels, like in a flood; lower levels, like in a drought; and
lower slope of the river surface, like if a dam were built a short
distance downstream), recharge rate, pumping rate, porosity, thickness
of the aquifer.
Announcement: The NEIU
community's online forum "Bughouse" has established a forum especially
for Earth Science students! I will use the forum to post news of
job openings, class scheduling updates, and other news you can
use. But it's really your
forum--you can post ideas, ask questions, and discuss issues of
interest to you and other Earth Science students. The forum will
be as good and as interesting as the ESCI community makes it--so please
participate! You can get to
bughouse.neiu.edu (notice there's no "www" in that address!) by
clicking here. Register to use it, and you're on your way!
© 2004 Laura L.
Sanders.
Last updated April 24, 2004.