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Sediment loads and accumulation in a small Riparian Wetland system in Northern Missouri

Wetlands

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Abstract

Sediment transport and deposition along a stream in an agricultural basin (65 km2) in northern Missouri, USA were quantified as part of a long-term study to evaluate effects of silvicultural practices on the hydrology, sediment, vegetation, and wildlife characteristics of remaining forested riparian systems. Median cumulative sediment deposition, measured using feldspar clay pads, increased from August 1995 to August 1998 at a rate of about 1 cm/yr. Median deposition amounts from single floods ranged from 0.03 cm to 0.64 cm. Floodplain and riparian maintenance flows corresponded to monitored floods with calculated recurrence intervals as low as <2 years. Simple linear regression models, using flood event suspended-sediment load or streamflow characteristics, explained up to 82 percent of variability in median event sediment deposition on the floodplain clay pads. There was little apparent correlation between cumulative short-term deposition and site elevation, distance from channel, longitudinal distance, or fluvial landform type. This may be due to upstream channelization, floodplain complexity, short duration of events, or sediment-load characteristics of low-recurrence interval floods (<2 to 5 years) sampled in this study. Dendrogeomorphic measurements indicated a substantial increase in the mean rate of deposition on the Long Branch Creek floodplain from about 1950 through 1980. Eighty-nine percent of the clay pad monitoring sites and all dendrogeomorphic monitoring sites experienced net positive deposition emphasizing the role of this riparian area as a net sediment storage site.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Sediment loads and accumulation in a small Riparian Wetland system in Northern Missouri
Series title:
Wetlands
Volume
20
Issue:
2
Year Published:
2000
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Wetlands
First page:
219
Last page:
231
Number of Pages:
13