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Open AccessArticle

Comparative Analysis of Bioenergy Crop Impacts on Water Quality Using Static and Dynamic Land Use Change Modeling Approach

Department of Biological & Agricultural Engineering, University of Arkansas, Fayetteville, AR 72701, USA
*
Author to whom correspondence should be addressed.
Current affiliation: Wood Environment & Infrastructure Solutions, Inc., Wichita, KS 67202, USA.
Current affiliation: Department of Agricultural & Biological Engineering, Purdue University, West Lafayette, IN 47907, USA.
§
Current affiliation: The Climate Corporation, St. Louis, MO 63141, USA.
Water 2020, 12(2), 410; https://doi.org/10.3390/w12020410
Received: 3 December 2019 / Revised: 20 January 2020 / Accepted: 1 February 2020 / Published: 4 February 2020
(This article belongs to the Section Water, Agriculture and Aquaculture)
Researchers and federal and state agency officials have long been interested in evaluating location-specific impact of bioenergy energy crops on water quality for developing policy interventions. This modeling study examines long-term impact of giant miscanthus and switchgrass on water quality in the Cache River Watershed (CRW) in Arkansas, United States. The bioenergy crops were simulated on marginal lands using two variants of a Soil and Watershed Assessment Tool (SWAT) model. The first SWAT variant was developed using a static (single) land-use layer (regular-SWAT) and for the second, a dynamic land-use change feature was used with multiple land use layers (location-SWAT). Results indicated that the regular-SWAT predicted larger losses for sediment, total phosphorus and total nitrogen when compared to location-SWAT at the watershed outlet. The lower predicted losses from location-SWAT were attributed to its ability to vary marginal land area between 3% and 11% during the 20-year modeling period as opposed to the regular-SWAT that used a fixed percentage of marginal land area (8%) throughout the same period. Overall, this study demonstrates that environmental impacts of bioenergy crops were better assessed using the dynamic land-use representation approach, which would eliminate any unintended prediction bias in the model due to the use of a single land use layer. View Full-Text
Keywords: water quality; bioenergy crops; SWAT; marginal lands; dynamic land use change; watershed modeling water quality; bioenergy crops; SWAT; marginal lands; dynamic land use change; watershed modeling
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MDPI and ACS Style

Kumar, E.; Saraswat, D.; Singh, G. Comparative Analysis of Bioenergy Crop Impacts on Water Quality Using Static and Dynamic Land Use Change Modeling Approach. Water 2020, 12, 410.

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