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St. Louis Metro East region sediment and geomorphic study

By:
Edited by:
Sehlke G.Hayes D.F.Stevens D.K.

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Abstract

Judy's Branch, a small basin (8.64 mi2) near Glen Carbon, Illinois, is selected as a pilot site to determine sediment yield and channel erosion of streams draining the bluffs of the American Bottoms in the Metro East area of Illinois. This paper presents results of an on-going sediment and geomorphic study in Judy's Branch. The average suspended-sediment yield from two upland sub-basins (drainage area equals 0.23 and 0.40 miles2) is 851 tons/mile2-year between October 2000 and September 2003. The suspended-sediment yield at the Route 157 gage (2,188 tons/mile 2-year) (near outlet of the watershed; drainage area = 8.33 miles2) is approximately 1300 tons/mile2-year greater than the average of the upland gages for the same time period. This result is unexpected in that generally the suspended-sediment yield decreases as the watershed area increases because of sediment being stored in the channel and floodplain. The difference indicates a possible increase in yield from a source, such as streambank erosion, and supports the theory that land-use changes increase streamflows that may result in higher rates of streambank erosion. The best estimate of sediment yield from streambank erosion is 1,009 tons/mile 2-year at Route 157. This value is obtained utilizing both bank-rod data and resurveyed cross-section data.

Additional Publication Details

Publication type:
Conference Paper
Publication Subtype:
Conference Paper
Title:
St. Louis Metro East region sediment and geomorphic study
ISBN:
0784407371
Year Published:
2004
Language:
English
First page:
4463
Last page:
4474
Number of Pages:
12
Conference Title:
2004 World Water and Environmental Resources Congress: Critical Transitions in Water and Environmental Resources Management
Conference Location:
Salt Lake City, UT
Conference Date:
27 June 2004 through 1 July 2004