a gis-based modeling for groundwater vulnerability index in tuul river basin, north central mongolia
TRANSCRIPT
A GIS-based Modeling For Groundwater
Vulnerability Index in Tuul River Basin,
North Central Mongolia
V.Ulziisaikhan, M-Eng., PhD Student, MUSTEmail: [email protected]
N.Jadambaa, PhD - HydrogeologyEmail: [email protected]
D.Batjargal, BSc. – HydrogeologyEmail: [email protected]
Ulaanbaatar, 2010
A GIS-based Groundwater Vulnerability Index in Tuul River
Basin, Mongolia
Geography:
•Elevation: 742 ~ 2780 m
•Area: 49,744 sq. km
•River length: over 700 km
•Upstream: From Terelj, Khentii Mountain
•Downstream: To Orkhon river
Climate:
•Mean annual temperature 0.2 ~ -4.3 C
•Precipitation ranges 240 ~ 392 mm
•Annual potential evaporation - mm
Study Area: Tuul River Basin, Mongolia
Groundwater Exploitable Resource Map -Tuul River Basin
METHODLOGY
DRASTIC - US Environmental Protection Agency (Aller et al. 1987)
Factor , (1-10) Description Weight
D Depth to Water From ground surface to water table 5
R Recharge Amount of water which penetrates to GW. 4
A Aquifer Media Saturated zone properties 5
S Soil Texture Weathered portion of unsaturated zone 2
T Topography Slope of land surface 1
I Impact of VadosZone
Unsaturated zone properties 5
C Conductivity Ability of aquifer to transmit water 3
DRASTIC Index = Dx5 + Rx4 + Ax5 + Sx2 + Tx1 + Ix5 + Cx3
Parameter Map – Depth to Water
Parameter Map - Recharge
Parameter Map – Aquifer Media
Parameter Map- Soil Texture
Parameter Map- Topography
Parameter Map- Vados Zone (I)
Parameter Map- Conductivity
RESULT – ҮР ДҮН