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Coarse particulate organic matter (CPOM) fulfills important functions in thephysical and ecological system of a stream. CPOM delivery to and export fromthe stream has implications for the stream's morphology and sedimenttransport capacity as well as the energy budget and food availability.Export rates of CPOM from mountain catchments have been observed to stronglyincrease with rising discharge, but the mechanism leading to this strongrelationship is unclear. Here, we show that log jams in the Erlenbach, asteep headwater stream in the Swiss Prealps, are an effective barrier forthe transport of CPOM pieces, and thus become sites of storage of largequantities of material over time. Exceptional discharge events with returnperiods exceeding 20 years play a dual role in CPOM transport in theErlenbach. First, they appear to destroy existing log jams, releasing thestored material (wood and sediment). Second, they intensifychannel–hillslope coupling, thereby recruiting new logs to the channel,around which new jams can form. This allows for the formulation of a new, fullyepisodic end-member in a four-end-member model of CPOM dynamics of steepmountain streams based on wood delivery and export

The role of log jams and exceptional flood events in mobilizing coarse particulate organic matter in a steep headwater stream