CAN TEMPERATURE-DEPTH PROFILES CONSTRAIN

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Presentation transcript:

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

THE IDEA (1) Taniguchi, GRL, 27, 713-716, 2000 A R P Q

THE IDEA (2) Taniguchi, GRL, 27, 713-716, 2000

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

MODEL GEOMETRY W Wseep Wsea D x y H R Van der Veer J. Hydrol, 35, coastline R Van der Veer J. Hydrol, 35, 271-178, 1977 I did some corrections here!

NUMERICAL MODEL coastline no flow

RESULTS (1)

RESULTS (2)

INFORMATION IN RESIDUALS Temperature “Residuals” Depth (m)

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

FIELD MEASUREMENTS

FIELD MEASUREMENTS 1 2 km

SAMPLE RESULTS T (oC) dT/dz (oC/m) T (oC) dT/dz (oC/m) fresh fresh salt salt fresh < 50 mg/l < transition < 13000 mg/l < salt

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