stochastic rainfall model, rainfall runoff, flood frequency, climate sensitivity
A spatial-temporal Neyman-Scott Rectangular Pulse (NSRP) stochastic rainfall model is developed for seasonal-continuous simulation to project annual discharge probabilities from a relatively small watershed, the 1395 km2 Upper Iowa River watershed upstream from Decorah, Iowa. NSRP rainfall data is used as rainfall input to TOPMODEL, a conceptual, semidistributed rainfall runoff model, to calculate river discharge at a site common to the United States Geological Survey (USGS) gauging station in Decorah, Iowa. Annual peak flows based on simulated rainfall are used to fit a log-Pearson type III distribution to project 1 %-, 0.2%-, and 0.1 %-annual discharges. These results are compared to projections for the same frequency flows based on observed annual peak flow data measured at the USGS gauge site in Decorah. The NSRP model parameters are modified to reflect changes in environmental storm parameters (e.g. rainfall intensity and storm frequency) due to a warming atmosphere to study the sensitivity of annual peak flows due to climate variations.
Journal of the Iowa Academy of Science
© Copyright 2011 by the Iowa Academy of Science, Inc.
"Flood Frequency Estimation by Neyman-Scott Rectangular Pulse Rainfall Model and TOPMODEL,"
Journal of the Iowa Academy of Science: JIAS, 118(1-4), 1-7.
Available at: https://scholarworks.uni.edu/jias/vol118/iss1/3