GIS for Environmental Modeling
| Geog 479/559 Spring 2011 | M W 2:00pm-3:20pm |
| Instructor: Ling Bian
Office: 120 Wilkeson Quad Office Hours: M W 3:30pm-4:30pm |
145H Wilkeson Lab: T 11:00am-12:20pm or W 6:30pm-7:50pm, Wilkeson 145C TA: Sam Copeland |
Weighing GIS layers
A hydrological model
To estimate groundwater recharge
in order to issue water pump permission
Statistics: Multiple regression
Variables
Dependent variable: groundwater
recharge
Independent variables:
1. annual precipitation
2. soil-profile water storage
during spring (average max storage)
3. depth to water table
in spring (average shallowest depth)
4. spring precipitation
rate
= spring
precip/number of spring precip days
5. number of precip days
during the year
Regression
Independent variable
1-4 are included in the regression
Variable(5) is excluded because level of sig>0.05 for F test
Recharge = -48.8347 + 0.1917X1
- 0.0829X2 - 4.9594X3 + 5.3639X4
R2 = 0.76
GIS analysis: to regionalize the site-specific data
GIS data layers:
1. annual precipitation,
climatic stations, contour lines
2. spring soil storage, SCS, polygons
3. depth to water table,
well log, contour lines
4. spring precipitation
rate, climatic stations, contour
GIS overlay:
Recharge potential = -48.8347 + 0.1917X1 - 0.0829X2 - 4.9594X3 + 5.3639X4
Result: a final groundwater recharge map