TY - GEN
T1 - Plot and small watershed scale modeling of infiltration and runoff on a semiarid grassland using distributed Green and Ampt infiltration parameters
AU - Paige, Ginger
AU - Stone, Jeffrey
AU - Guertin, D. Phillip
PY - 2005
Y1 - 2005
N2 - The relationship between hydrologic processes and scale is one of the more complex issues in surface water hydrology. Plot scale measurements of infiltration and runoff were made on 2 m by 6 m rainfall simulator plots on an instrumented sub-watershed within the USDA-ARS Walnut Gulch Experimental Watershed (WGEW). Rainfall and runoff data have been collected for over 30 years on the 1.9 ha sub-watershed using a recording rain gage and instrumented weir. Detailed soils, vegetation, and topography data have been collected at both the plot and watershed scales and input into a GIS. Plot scale infiltration and runoff measurements were made using a variable intensity rainfall simulator at a range of intensities and two different soil moisture conditions within the watershed. A distributed, process-based hydrologic model coupled with a GIS is used along with measured plot characteristics to determine distributed Green and Ampt infiltration parameters using the plots as micro-watersheds. The same hydrologic model is used to determine distributed infiltration parameters using a range of spatial configurations at watershed scale. The level of discretization necessary to model the observed infiltration and runoff processes at both the plot and small watershed scales are compared.
AB - The relationship between hydrologic processes and scale is one of the more complex issues in surface water hydrology. Plot scale measurements of infiltration and runoff were made on 2 m by 6 m rainfall simulator plots on an instrumented sub-watershed within the USDA-ARS Walnut Gulch Experimental Watershed (WGEW). Rainfall and runoff data have been collected for over 30 years on the 1.9 ha sub-watershed using a recording rain gage and instrumented weir. Detailed soils, vegetation, and topography data have been collected at both the plot and watershed scales and input into a GIS. Plot scale infiltration and runoff measurements were made using a variable intensity rainfall simulator at a range of intensities and two different soil moisture conditions within the watershed. A distributed, process-based hydrologic model coupled with a GIS is used along with measured plot characteristics to determine distributed Green and Ampt infiltration parameters using the plots as micro-watersheds. The same hydrologic model is used to determine distributed infiltration parameters using a range of spatial configurations at watershed scale. The level of discretization necessary to model the observed infiltration and runoff processes at both the plot and small watershed scales are compared.
UR - http://www.scopus.com/inward/record.url?scp=27744548041&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=27744548041&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:27744548041
SN - 0784407630
T3 - Proceedings of the 2005 Watershed Management Conference - Managing Watersheds for Human and Natural Impacts: Engineering, Ecological, and Economic Challenges
SP - 1753
BT - Managing Watersheds for Human and Natural Impacts
A2 - Moglen, G.E.
T2 - 2005 Watershed Management Conference - Managing Watersheds for Human and Natural Impacts: Engineering, Ecological, and Economic Challenges
Y2 - 19 July 2005 through 22 July 2005
ER -