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4. INTERCEPTION

4. INTERCEPTION. Evapo - Transpiration ET. Precipitation P. S. Throughfall P T. Stemflow P S. Dripping P D. INPUT = OUTPUT +/-  STORAGE. P = (P T + P S + P D + E) +/-  S. P forest = (P T + P S + P D ). P interception = E +/-  S. P = P forest + P interception.

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4. INTERCEPTION

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  1. 4. INTERCEPTION

  2. Evapo- Transpiration ET Precipitation P S Throughfall PT Stemflow PS Dripping PD

  3. INPUT = OUTPUT +/-  STORAGE P = (PT + PS + PD + E) +/-  S Pforest = (PT + PS + PD) Pinterception = E +/-  S P = Pforest + Pinterception

  4. ATMOSPHERE VEGETATION GROUND

  5. ATMOSPHERE VEGETATION GROUND

  6. ATMOSPHERE VEGETATION GROUND

  7. ATMOSPHERE VEGETATION GROUND

  8. ATMOSPHERE VEGETATION GROUND

  9. ATMOSPHERE VEGETATION GROUND

  10. Include Evaporative Loss

  11. Without ET

  12. Without ET

  13. Observed interception Calculated as the mean of the “interceptometer’ readings Source: R. Horton, 1919. Monthly Weather Review

  14. Initially leaf storage accounts for all precipitation in the storm Transition during which leaf storage becomes proportionally less important relative to the total precipitation in the storm. Evaporation as a fixed percentage of precipitation accounts for most of the precipitation NOT reaching the ground

  15. Initially leaf storage accounts for all precipitation in the storm Transition during which leaf storage becomes proportionally less important relative to the total precipitation in the storm. Evaporation as a fixed percentage of precipitation accounts for most of the precipitation NOT reaching the ground Snowmelt drip After Schomaker, 1966

  16. Front Ranges, Colorado 2012 Forest Fires 2013 Floods Source: Bonan, 2008: Ecological Climatology

  17. INTERRELATIONSHIP BETWEEN INTERCEPTION TERMS L = S + K.E.t S = Leaf storage (e.g. 0.05cm) K = Leaf Area Index (e.g. 0.6) E = Evaporation rate (e.g. 0.1 cm/hr) Rainfall intensity = 0.5 cm/hr Cumulative Rainfall Cumulative Interception (L)

  18. Veg Ground

  19. Leaf area index in monocultures and mixtures of Cedrela, Cordia, and Hyeronima from age 1.0 to 3.5 yr at La Selva Biological Station, CostaRica. From: Menalled, Kelty and Ewell, 1998

  20. INTERRELATIONSHIP BETWEEN INTERCEPTION TERMS Interception as % of rainfall

  21. (inches) Source: Gray, 1970, Principles of Hydrology

  22. Source: Gray, 1970, Principles of Hydrology

  23. Source: TobonMarin et al., 2000

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