We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Predicting stream channel erosion in the lacustrine core of the upper Nemadji River, Minnesota (USA) using stream geomorphology metrics.
- Authors
Magner, Joseph A.; Brooks, Kenneth N.
- Abstract
The USA Clean Water Act requires the development of a total maximum daily load (TMDL) when Minnesota’s water quality standard for turbidity is exceeded; however, regions underlain with fine-grained lacustrine deposits yield large natural background loads of suspended inorganic sediment. A review of hydrogeologic pathways was conducted along with the statistical analysis of geomorphic metrics, collected at 15 sites with varying drainage areas in the upper Nemadji River basin, northeastern Minnesota. Regression analysis indicated a strong linkage between bankfull cross-sectional area and drainage area. Dimensionless geomorphic metric ratios were developed to predict channel evolution potential and associated channel erosion risk. Sites located in drainage areas less than 2 km2 had low erosion risk and showed a correlation between channel slope and relative roughness ( D 84/mean bankfull channel depth, 88%). A principal components analysis explained over 98% of the variance between sites and indicated five important channel shape metrics to predict channel erosion: bankfull width, bankfull depth, maximum depth, cross-sectional area, and valley beltwidth. Mass wasting of cohesive stream channel sediment was influenced by groundwater discharge and produced turbid waters in the upper Nemadji River.
- Subjects
NEMADJI State Forest (Minn.); MINNESOTA; STREAM channelization; HYDRAULIC engineering; LAKE hydrology; HYDROLOGY; EROSION; WATER quality
- Publication
Environmental Geology, 2008, Vol 54, Issue 7, p1423
- ISSN
0943-0105
- Publication type
Article
- DOI
10.1007/s00254-007-0923-3