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Changes in the Sediment Budget and in Stream Morphology, Coon Creek Wisconsin, 1975-1993

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  701P0904,  . (doi: 10.13031/2013.17364)
Authors:   Stanley W. Trimble

Coon Creek Wisconsin is a stream that has undergone significant morphological changes over historical time. These changes are due to changes of hydrology and sediment loads which, in turn, are due to changes of land use and land treatment. Considered here are changes for the period 1975-1993 when, due to implemented soil conservation measures, storm hydrologic response was mild and sediment loads were very low (1). Tributaries, now sediment sinks, featured continued vertical accretion on new (post-1930s), lower, inset floodplains created since the 1930s when soil conservation measures were first installed. The upper main valley had been a strong sediment source, primarily from eroding cut banks, since the 1930s, but vertical accretion on new (post 1930s), lower, inset floodplains offset the loss by cut banks in the recent period. This was the greatest surprise of the study. The floodplain of the lower main valley continued to aggrade but at only about 6% of the maximum rate of the 1930s. However, areas adjacent to the streams aggraded significantly more than backswamp areas more distant from the stream. This appears to be due to a coarser sediment load created by the stream reworking old upstream alluvium.

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