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Soil Water Balance Components and Methods for Calculation

Project TR37010: Urban Drainage Systems as Key Infrastructure in Cities and Towns. Soil Water Balance Components and Methods for Calculation. PhD Student: Željko Vasilić. Mentor : Miloš Stanić. Belgrade, 26.04.2013. Outline:. Introduction Soil water balance Evapotranspiration

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Soil Water Balance Components and Methods for Calculation

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  1. Project TR37010: UrbanDrainage Systems as Key Infrastructure in Cities and Towns Soil Water BalanceComponents and Methods for Calculation PhD Student: Željko Vasilić Mentor: Miloš Stanić Belgrade, 26.04.2013.

  2. Outline: • Introduction • Soil water balance • Evapotranspiration • Infiltration • Conclusions

  3. About project TR 37010 • „UrbanDrainage Systems as Key Infrastructure in Cities and Towns“ • Funded by Ministry of Science • Experimental catchments for investigation of urban runoff

  4. About project TR 37010 Parking area Oil separator • Experimental catchment – Belgrade Infiltration tank

  5. About project TR 37010 • Experimental catchment – Belgrade

  6. P ET Soil Water Balance E P-Pint Qsurf • Water balance components (for unsaturated soil) INF unsaturated GWR saturated • Evapotranspiration • Infiltration Process of water penetrating from the ground surface into the soil.

  7. Evapotranspiration modelling ETp – potential ET0 – Reference Ea– actual • Factors driving the process • Energy • Meteorological factors (T, Humidity, Wind speed..) • Other factors affecting Ea • Soil characteristics and conditions • Vegetation characteristics • Environmental conditions

  8. Evapotranspiration modelling • Methods for calculation • Energy balance method • Aerodynamic method • Combined method • Methods for calculation of ETp • Blaney– Cridle eq. • Pristley – Taylor eq. • Penman – Monteith eq.

  9. Penman Monteith method

  10. Penman Monteith method • Assumes horizontal surface. Modification (Allen,2006):

  11. Penman Monteith method • Results data from meteo station SmederevskaPalanka Lat 44o22’N ; Lon 20o57’ E; Altitude 121.0 m Total annual ET Orientation South Orientation North

  12. Inflitration modelling Basic equation for unsaturated flow Continuity equation (z direction): Momentum equation: Combination gives (Richard’s eq.):

  13. f(t) (mm/h) Infiltration modelling fo α1 • Other methods • Simple methods • Horton equation • Philips Equation α2>α1 • Based on approximate theory • Green Ampt method • (k=const.,sharp boundary wetting front,semi-infinitive domain…) fc t(h) Darcy’s law: Continuity eq.: Combined: Horton’s method

  14. Inflitration modelling Implementation of Simplified Green Ampt model Darcy’s law: Continuity eq.: Combined (with assumptions):

  15. Conclusions and future work • Slope and orientation of the surface can significantly affect evapotranspiration • Infiltration can be calculated using methods of different complexity • After the measured data from the experimental catchments are obtained all methods will be tested

  16. Thank You for Your Attention!!!

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