An Assessment of Snowpack Depletion-Surface Runoff Relationships on Forested Watersheds.

摘要

A technique was developed for determining daily values of runoff efficiencies from small watersheds by coupling a computer model that simulated Arizona snowmelt processes with graphical techniques of runoff hydrograph separation. The computer program was a USDA Forest Service model modified to better simulate Arizona conditions. An explanation of modifications and limitations of the model is given,along with equations for estimating some of the model input variables. Seven small watersheds with a total of 14years of record were used in evaluating changing patterns of runoff efficiencies within a year. Additionally,many physical,biological,and climatic variables were correlated with seasonal runoff efficiencies not only among years and among watersheds,but also within a watershed among years,and among watersheds within a season. Prediction equations were also formulated that could be of use in the identification of high water yielding watersheds.