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Statistical analysis of climatological data to characterize erosion potential: 6. joint precipitation and freezing cvents in eastern Oregon/Washington Public Deposited

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Published April 1984. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog:  http://extension.oregonstate.edu/catalog

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  • When precipitation falls on frozen soil, serious soil loss can occur. In order to assign realistic probabilities to the occurrence of this condition for use in predicting erosion rates over long time periods, a technique for combining characteristics of precipitation and air temperature records is applied to hourly wet season data from Pendleton, Oregon and Walla Walla, Washington. Periods of overlapping precipitation and freezing air temperature events are combined into clusters and the values of thirteen characteristics that are associated with each cluster are examined. The statistical analyses of the cluster characteristics include discussions of the marginal distributions and order statistics of the individual characteristics as well as joint distributions of several pairs of characteristics. The order statistics provide information about extreme values of individual characteristics (e.g., minimum temperature) whereas the probabilities of occurrence of certain combinations of characteristics (e.g., precipitation amount and freeze index) are estimated by the joint distributions. The results of these analyses provide information regarding the types of precipitation events that occur in combination with freezing air temperatures in eastern Oregon and Washington as well as estimates of specific probabilities that are important in the modeling and forecasting of soil erosion in this region.
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