HR: 1330h
AN: H42D-1110    [PDF]
TI: Small-Scale Land Surface Variability Effects on Hillslope-Scale Hortonian Runoff Generation
AU: * Fiedler, F R
EM: fritz@uidaho.edu
AF: University of Idaho, Dept of Civil Engineering, Moscow, ID 83844 United States
AB: Factors that control infiltration, and therefore runoff generation, are known to vary at sub-hillslope scales. Spatially variable runoff generation leads to the potential for interactive infiltration. These small-scale dynamic interactions can exert a strong control over hillslope-scale response timing and magnitude. Questions remain regarding the nature of small-scale interactions: What is the aggregated effect of increasing variability? How do correlation length scale and structure govern interactive infiltration? How do these factors interact with macro and microtopography? These and other questions can be addressed using direct numerical simulation of the small-scale hydrodynamic processes, using a computational mesh small enough to explicitly resolve landscape spatial variability. For such simulations, random landscape property fields that comprise synthetic hillslopes with specific characteristics (e.g., mean, coefficient of variation, correlation length scale and structure of saturated hydraulic conductivity) are generated. Results of simulations performed on a range of synthetic hillslopes are presented in this poster.
DE: 1824 Geomorphology (1625)
DE: 1833 Hydroclimatology
DE: 1851 Plant ecology
DE: 1860 Runoff and streamflow
DE: 1866 Soil moisture
SC: Hydrology [H]
MN: 2003 Fall Meeting