Statistical Low Flow Estimation Using GIS Analysis in Humid Montane Regions inPuerto Rico

摘要

Statistical analysis of watershed parameters derived using a GeographicalInformation System (GIS) was done to develop equations for estimating the 7d-10yr, 30d-10yr, and 7d-2yr low flow for watersheds in humid montane regions of Puerto Rico. Digital elevation models and land use, geology, soils, and stream network coverages were used to evaluate 21 geomorphic, 10 stream channel, 9 relief, 7 geology, 4 climate, and 2 soil parameters for each watershed. To assess which parameters should be used for further investigation, a correlation analysis was used to determine the independence and collinearity among these parameters and their relationship to low flows. Multiple regression analyses using the selected parameters were then performed to develop the statistical models of low flow.