Lecture7

Lecture7 - Climate Change & Change in Rainfall Patterns...

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Climate Change & Change in Rainfall Patterns ainfall as the major driving force of dynamics in wetlands Rainfall as the major driving force of dynamics in wetlands. The short and long term hydrologic and vegetation processes in etlands will be altered in response to the change in rainfall wetlands will be altered in response to the change in rainfall regimes. However, the controlling role of rainfall stochasticity on hydrologic and vegetation dynamics is not well understood.
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odel Components Model Components Unsaturated zone: Soil moisture dynamics aturate zone: Water table fluctuations Saturate zone: Water table fluctuations Vegetation dynamics: 2 plant species (FR, LFR) Source: Stochastic rainfall Sink: Evapotranspiration y y s w s s fc Saturated zone Saturated zone
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odel Assumptions: Model Assumptions: R(y)= 1-exp(-1/MR*y) pth, y Mean root depth, MR ter table de p 1 – R(y) = exp(-1/MR*y) Exponential root density distribution in the soil profile Wa t
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filtration I(t) Infiltration I(t) The occurrence of rainfall is modeled as a marked oisson process with rate Poisson process with rate . ’ ~ Exp(1/ ) h ~ Exp( ) ~ Exp(1/ ) The occurrence of infiltration is modeled as a censored marked-Poisson process with rate ’. (Rodriguez-Iturbe et al., 1999; Laio et al., 2001) ffective rainfall depth is exponentially Effective rainfall depth is exponentially distributed with mean
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h r t r n d t r R ( ) Recharge to groundwater, Re(s,y) The time varying water storage capacity of the unsaturated zone WSC (s,y) can be viewed as the threshold above which recharge, Re, ccurs occurs
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t i t i Evapotranspiration Saturated zone Unsaturated zone anoxic coefficient y aturated S=1 1 Saturated zone S fc S* S w
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Water Balance in the Unsaturated Zone: Infiltration, Recharge, and Transpiration If I(t) WSC(t) (no recharge to groundwater occurs): t B f A T t t I ys n ys n L L uns t t t ) ( ) ( ) ( Since no recharge to groundwater occurs: t t t y y s t B f A T t t I ) ( t L L uns t t t ny s s
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Water Balance in the Unsaturated Zone: Infiltration, Recharge, and Transpiration If I(t) WSC(t) (recharge to groundwater occurs): t B f A T t t I ys n
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This note was uploaded on 07/09/2011 for the course CWR 5104C taught by Professor Miralles during the Spring '11 term at FIU.

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Lecture7 - Climate Change & Change in Rainfall Patterns...

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