Title: Hydrologic and water quality responses to biomass production in the Tennessee river basin

Abstract

Abstract Reducing dependence on fossil‐based energy has raised interest in biofuels as a potential energy source, but concerns have been raised about potential implications for water quality. These effects may vary regionally depending on the biomass feedstocks and changes in land management. Here, we focused on the Tennessee River Basin ( TRB ), USA . According to the recent 2016 Billion‐Ton Report ( BT 16) by the US Department of Energy, under two future scenarios (base‐case and high‐yield), three perennial feedstocks show high potential for growing profitably in the TRB : switchgrass ( Panicum virgatum ), miscanthus ( Miscanthus  ×  giganteus ), and willow ( Salix spp.). We used the Soil & Water Assessment Tool ( SWAT ) to compare hydrology and water quality for a current landscape with those simulated for two future BT 16 landscapes. We combined publicly available temporal and geospatial datasets with local land and water management information to realistically represent physical characteristics of the watershed. We developed a new autocalibration tool ( SWAT opt) to calibrate and evaluate SWAT in the TRB with reservoir operations, including comparison against synthetic and intermediate response variables derived from gage measurements. Our spatiotemporal evaluation enables to more realistically simulatemore » the current situation, which gives us more confidence to project the effects of land‐use changes on water quality. Under both future BT 16 scenarios, simulated nitrate and total nitrogen loadings and concentrations were greatly reduced relative to the current landscape, whereas runoff, sediment, and phosphorus showed only small changes. Difference between simulated water results for the two future scenarios was small. The influence of biomass production on water quantity and quality depended on the crop, area planted, and management practices, as well as on site‐specific characteristics. These results offer hope that bioenergy production in the TRB could help to protect the region's rivers from nitrogen pollution by providing a market for perennial crops with low nutrient input requirements.« less

Authors:

Wang, Gangsheng  ^[1];

• Search DOE PAGES for author "Wang, Gangsheng"
• Search DOE PAGES for ORCID "0000-0002-8117-5034"

Jager, Henriette I.  ^[2];

• Search DOE PAGES for author "Jager, Henriette I."
• Search DOE PAGES for ORCID "0000-0003-4253-533X"

Baskaran, Latha M. ^[3]; Brandt, Craig C. ^[4]

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+ Show Author Affiliations

1. Environmental Sciences Division Oak Ridge National Laboratory Oak Ridge Tennessee, Climate Change Science Institute Oak Ridge National Laboratory Oak Ridge Tennessee, Department of Microbiology and Plant Biology Institute for Environmental Genomics University of Oklahoma Norman Oklahoma
2. Environmental Sciences Division Oak Ridge National Laboratory Oak Ridge Tennessee, Climate Change Science Institute Oak Ridge National Laboratory Oak Ridge Tennessee
3. Environmental Sciences Division Oak Ridge National Laboratory Oak Ridge Tennessee
4. Biosciences Division Oak Ridge National Laboratory Oak Ridge Tennessee

Publication Date:

Thu Aug 09 00:00:00 EDT 2018

Research Org.:

Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:

USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Bioenergy Technologies Office

OSTI Identifier:

1463910

Alternate Identifier(s):

OSTI ID: 1463911; OSTI ID: 1784227

Grant/Contract Number:  

AC05-00OR22725

Resource Type:

Published Article

Journal Name:

Global Change Biology. Bioenergy

Additional Journal Information:

Journal Name: Global Change Biology. Bioenergy Journal Volume: 10 Journal Issue: 11; Journal ID: ISSN 1757-1693

Publisher:

Wiley-Blackwell

Country of Publication:

United Kingdom

Language:

English

Subject:

09 BIOMASS FUELS; bioenergy crops; biomass production; spatiotemporal evaluation; SWAT; Tennessee River Basin; water quality