WATERSHED CONFIGURATION AND GEOGRAPHIC INFORMATION SYSTEM PARAMETERIZATION FOR SPUR MODEL HYDROLOGIC SIMULATIONS

摘要: A grid cell geographic information system (GIS) is used to parameterize SPUR, a quasi-physically based surface runoff model in which watershed configured as set of stream segments and contributing areas. GIS analysis techniques produce various configurations by progressive simplification network delineated from digital elevation models (DEM). The authors three configurations: {ge}2nd, {ge}4th, {ge}13th Shreve order networks, where the contains 28, 15, 1 channel with 66, 37, 3 areas, respectively. Watershed configuration controls simulated daily monthly sums volumes. For climatic topographic setting southeastern Arizona {ge}4th areas produces results that are typically good {ge} 2nd network. However both consistently better than configuration. Due degree parameterization simulations cannot be significantly improved increasing beyond However, range Soil Conservation Service curve numbers derived rainfall/runoff data can affect simulations. Higher yield for {ge}2nd while lower ordermore » network.« less