Swat modeling of sediment, nutrients and pesticides in the Le-Sueur River watershed, south-central Minnesota.

Loading...
Thumbnail Image

Persistent link to this item

Statistics
View Statistics

Journal Title

Journal ISSN

Volume Title

Title

Swat modeling of sediment, nutrients and pesticides in the Le-Sueur River watershed, south-central Minnesota.

Published Date

2010-01

Publisher

Type

Thesis or Dissertation

Abstract

The Le Sueur River Watershed (LRW) of South-Central Minnesota drains 2,850 km² in the Minnesota River Basin. The watershed has an annual discharge of 230 mm and generates significant sediment and chemical pollution. The objective of this study was to quantify the spatial and temporal patterns of sediment, nutrient (nitrate-nitrogen, phosphorus) and pesticide (atrazine, acetochlor and metolachlor) losses from the LRW using the Soil and Water Assessment Tool (SWAT) model. The SWAT model was calibrated and validated from 2000-2006 in the Beauford sub-watershed. The calibrated model was applied to the entire LRW mainly to identify critical pollutant contributing areas and to evaluate effectiveness of alternative best management practices to reduce the loadings. The study has five major parts. The first part deals with hydrologic simulation. The second part identifies the relative contribution of upland and channel sediment sources. The third part deals with water quality impacts of land use and management alternatives on phosphorus and nitrogen losses to the LRW. The fourth part deals with pesticide losses. The fifth part deals with impacts of various biofuel production options on water quality. The LRW has estimated annual loadings of 1.0 kg TP/ha, 18 kg NO3-N/ha and 302,000 t/yr of sediment that contribute to water quality impairments in Lake Pepin and the Mississippi River. Alternative management practices are predicted to reduce upland sediment yield by up to 54%, nitrate-N losses by 22%, and phosphorus loadings by 64%. Overall, the SWAT model was able to accurately simulate the hydrology and transport of chemical pollutants under the land use systems, climate, hydrologic and physiographic settings of South-Central Minnesota.

Description

University of Minnesota Ph.D. dissertation. January 2010. Major: Soil Science. Advisor: D. J. Mulla. 1 computer file (PDF); xii, 219 pages. Ill. (some col.)

Related to

Replaces

License

Collections

Series/Report Number

Funding information

Isbn identifier

Doi identifier

Previously Published Citation

Suggested citation

Folle, Solomon Muleta. (2010). Swat modeling of sediment, nutrients and pesticides in the Le-Sueur River watershed, south-central Minnesota.. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/59212.

Content distributed via the University Digital Conservancy may be subject to additional license and use restrictions applied by the depositor. By using these files, users agree to the Terms of Use. Materials in the UDC may contain content that is disturbing and/or harmful. For more information, please see our statement on harmful content in digital repositories.