Runoff Generation and Routing in the TOPMODEL

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Presentation transcript:

Runoff Generation and Routing in the TOPMODEL Venkatesh Merwade

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

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

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

Index Curve Area Ln(a/tanb)

Run off Generation Contributing Area Still No Runoff! Ground Surface Zi Water Table Z To Outlet Channel Datum

Runoff Generation Cont’d

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

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