1. CAN TEMPERATURE-DEPTH PROFILES CONSTRAIN
THE DEPTH OF THE FRESH-SALT INTERFACE
IN COASTAL AREAS?
Henk Kooi & Linda Ruijpers
Faculty of Earth and Life Sciences
Vrije Universiteit Amsterdam

2. THE IDEA (1)
Taniguchi, GRL, 27, , 2000 A R P Q

3. THE IDEA (2)
Taniguchi, GRL, 27, , 2000

4. Are such T-depth profiles found elsewhere?
RESEARCH QUESTIONS
Does groundwater flow really produce these patterns?
Are such T-depth profiles found elsewhere?

5. MODEL GEOMETRY W Wseep Wsea D x y H R Van der Veer J. Hydrol, 35,
coastline R
Van der Veer
J. Hydrol, 35, ,
1977
I did some corrections here!

6. NUMERICAL MODEL
coastline
no flow

7. RESULTS (1)

8. RESULTS (2)

9. INFORMATION IN RESIDUALS
Temperature
“Residuals”
Depth (m)

10. DERIVATIVE IS MORE INDICATIVE
T (oC)
dT/dz (oC/m)
Depth (m)

11. FIELD MEASUREMENTS

12. FIELD MEASUREMENTS 1
2 km

13. SAMPLE RESULTS T (oC) dT/dz (oC/m) T (oC) dT/dz (oC/m) fresh fresh
salt
salt
fresh < 50 mg/l < transition < mg/l < salt

14. T-residuals do not indicate interface
CONCLUSIONS
T-residuals do not indicate interface
Vertical derivatives provide rough indication
Predicted relationship not found in Netherlands
Profiles in Tonami coastal plain likely reflect cooling