Journal article
EVALUATING CAUSAL FACTORS THAT INFLUENCE THE SPATIAL AND TEMPORAL VARIABILITY OF STREAMBANK EROSION IN IOWA
JOURNAL OF THE ASABE, Vol.65(6), pp.1465-1473
01/01/2022
DOI: 10.13031/ja.14894
Abstract
Streambank erosion exhibits high variability both spatially and temporally, and few studies have attempted to characterize the causal factors of the variability at regional and seasonal scales. This study combines geotechnical field measurements with historical trends of soil moisture and temperature to quantify the spatial and temporal variability of critical shear stress and erodibility in streambanks of the Major Land Resource Areas of Iowa (MLRAs). The data suggest that till-derived soils in north-central and northeast Iowa lack cohesion compared to loess-derived soils in southern Iowa. Thus, critical shear stress values from the northern parts of the state were significantly less than those from western and southern Iowa. A multivariate regression equation was developed using properties of texture and bulk density to quantify critical shear stress values for all stream bank soil series in the state. The cumulative distribution functions of these values visually reflect the separation between the critical shear stress values of the different MLRAs, with the loess-derived soils in western and southern Iowa having similar, overlapping patterns, in contrast to MLRAs in north central and northeast Iowa with the till-derived soils. Temporally, the critical shear stress reaches minimum values during March when soil mois-ture is high and there are several freeze-thaw events. This is most apparent with bank soils in eastern Iowa.
Details
- Title: Subtitle
- EVALUATING CAUSAL FACTORS THAT INFLUENCE THE SPATIAL AND TEMPORAL VARIABILITY OF STREAMBANK EROSION IN IOWA
- Creators
- Christopher G. Wilson - University of Tennessee at KnoxvilleKeith E. Schilling - Univ Iowa, Coll Engn, Iowa City, IA 52242 USAA. N. Thanos Papanicolaou - University of Tennessee at Knoxville
- Resource Type
- Journal article
- Publication Details
- JOURNAL OF THE ASABE, Vol.65(6), pp.1465-1473
- Publisher
- Amer Soc Agricultural & Biological Engineers
- DOI
- 10.13031/ja.14894
- ISSN
- 2769-3295
- eISSN
- 2769-3287
- Number of pages
- 9
- Grant note
- RB10-014 / Federal Highway Administration Iowa Department of Transportation
- Language
- English
- Date published
- 01/01/2022
- Academic Unit
- Earth and Environmental Sciences; IIHR--Hydroscience and Engineering
- Record Identifier
- 9984383914502771
Metrics
4 Record Views