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Runoff Generation and Routing in the TOPMODEL

Runoff Generation and Routing in the TOPMODEL. Venkatesh Merwade. Recap. E. Overland Flow. Gravity Zone. Saturated Zone. P. Root Zone. R. Soil Moisture Deficit. Key Points. Z i (The distance between the land surface and the groundwater table) Topographic Index

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Runoff Generation and Routing in the TOPMODEL

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  1. Runoff Generation and Routingin the TOPMODEL Venkatesh Merwade

  2. Recap E Overland Flow Gravity Zone Saturated Zone P Root Zone R Soil Moisture Deficit

  3. Key Points • Zi (The distance between the land surface and the groundwater table) • Topographic Index • Drainage Area (Contributing area)

  4. Topographic Index • What is Topographic Index ? • x = ln(a/tanb) • a = A/(nL) • Index Curve • It defines the percentage of the total drainage area that contributes to the surface runoff.

  5. Index Curve Area Ln(a/tanb)

  6. Run off Generation ContributingArea Still No Runoff! GroundSurface Zi Water Table Z To Outlet Channel Datum

  7. Runoff Generation Cont’d

  8. Routing • The transfer component is divided into two phase • Overland flow within the contributing area which is routed at a velocity proportional to the local gradient with overland flow velocity constant. • Flow to the outlet

  9. The saturation excess and the overland flow is routed through a routing model to get the resulting run-off. Routing cont’d Saturation excess and Overland flow Channel (Linear Routing) Runoff

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