Administrative Report Or Publication

 

Statistical analysis of climatological data to characterize erosion potential : 4. freezing events in eastern Oregon/Washington Public Deposited

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https://ir.library.oregonstate.edu/concern/administrative_report_or_publications/v692t7134

Published October 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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  • The occurrence of frozen soil has a major effect on runoff and soil loss in the Pacific Northwest. Hence, information regarding the probabilities of occurrence of periods during which the soil may be frozen is necessary in order to adequately forecast long-term erosion rates for this region. In order to assign realistic probabilities to the occurrence of these periods, a long record of hourly surface air temperature data from Pendleton in eastern Oregon and Walla Walla in eastern Washington are summarized in terms of freezing events. The values of several characteristics of freezing events which may be useful for predicting soil frost occurrence are examined. The statistical analysis of the freezing event characteristics includes consideration of the marginal distributions and order and return statistics of the individual characteristics as well as joint and conditional distributions of several pairs of characteristics. The order and return statistics provide information about extreme values of individual characteristics, whereas the probabilities of occurrence of some combinations of characteristics are estimated by the joint distributions. Examination of the conditional distributions suggests the types of relationships that exist among the characteristics. The results of these analyses provide general information regarding the types of freezing events that occur in eastern Oregon and eastern 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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