Imbuhan Airtanah (Fh)

Imbuhan Airtanah(AT-6019)

Kompilasi

Prodi Magister TeknikAirtanah, FITB, ITB

Recharge vs. Discharge Area

►Recharge area : portion of the drainage basin in which the net saturated flow of groundwater is directed away from the water table

►Discharge area : portion of drainage basin in which the net saturated flow of groundwater is directed toward the water table

Freeze and Cherry, 1979

Water Flow Paths

Recharge vs. Discharge Area

►Recharge area : water table usually lies at some depth

►Discharge area : water table usually at or very near the surface

Freeze and Cherry, 1979

Recharge vs. Discharge Area

AE

DTopography

Water table

B C

Sumber : Hubbert (1940)

Kawasan Resapan

Kawasan Resapan

Bukan kawasan Resapan

AkiferLapisan kedap

Apakah semua puncak topografi adalah daerah resapan?

Groundwater Dating Method

AGEYoung

Groundwater

(0 – 60 yr)

Old Groundwater

(60 – 50,000 yr)

Very OldGroundwater

( > 50,000 yr)

METHOD

Tritium Silicon-32 Krypton-81

3H/3He Argon-39 Chloride-36

Helium-4 Carbon-14 Helium-4

Krypton-85 Indirect Methods Argon-40

CFCs 18O-2H Iodine-129

SF6

Inert and Active elements

Uranium Disequilibrium Series

36Cl/Cl

18O-2H(Kazemi et al., 2006)

(J.Toth, 1999)

Aliran RegionalIntermediateAliran Lokal

daerah discharge

daerah pedesaan

daerah discharge

?

Toth Model (1969) for Undulating Water Table

Local, intermediate, regional flow systems

Stagnation points – junction of flow systems

Intermediate – have at least one local flow system within

Relief and depth to length ratios affect flow system