Abstract
Abstract When mountain streams receive inputs of sediment from slope failures, normal downstream trends in size and sorting may be interrupted. The persistence of these impacts in time and space will depend on the timing, volume, and sizes of sediment added as well as the ability of a given stream to rework the added sediment. The purpose of this project was to describe and explain how stream substrates vary with distance downstream of slope failures in ten steepland drainages of the central Oregon Coast Range. Particle sizes and bankfull channel morphology were assessed at 248 transects along 151 kilometres of streams. These drainages differ in lithology, geologic structure, modes and rates of slope failures, and impact of clear-cut logging. Trends in particle size for five percentiles (D5, D16, D50, D84, D95) can be explained as power functions of distance downstream of debris torrents, with exponent values depending on timing of debris torrents, size of sediments to be reworked, and estimates of bankfull stream power. The findings reveal the impact of debris torrents triggered by clear-cut logging in the study region.
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