Agricultural and Biosystems Engineering Publications

Campus Units

Agricultural and Biosystems Engineering, Ecology, Evolution and Organismal Biology, Center for Agricultural and Rural Development

Document Type

Article

Publication Version

Published Version

Publication Date

12-2017

Journal or Book Title

Journal of the American Water Resources Association

Volume

53

Issue

6

First Page

1251

Last Page

1266

Research Focus Area(s)

Land and Water Resources Engineering

DOI

10.1111/1752-1688.12569

Abstract

Tile drainage significantly alters flow and nutrient pathways and reliable simulation at this scale is needed for effective planning of nutrient reduction strategies. The Soil and Water Assessment Tool (SWAT) has been widely utilized for prediction of flow and nutrient loads, but few applications have evaluated the model's ability to simulate pathway-specific flow components or nitrate-nitrogen (NO3-N) concentrations in tile-drained watersheds at the daily time step. The objectives of this study were to develop and calibrate SWAT models for small, tile-drained watersheds, evaluate model performance for simulation of flow components and NO3-N concentration at daily intervals, and evaluate simulated soil-nitrogen dynamics. Model evaluation revealed that it is possible to meet accepted performance criteria for simulation of monthly total flow, subsurface flow (SSF), and NO3-N loads while obtaining daily surface runoff (SURQ), SSF, and NO3-N concentrations that are not satisfactory. This limits model utility for simulating best management practices (BMPs) and compliance with water quality standards. Although SWAT simulates the soil N-cycle and most predicted fluxes were within ranges reported in agronomic studies, improvements to algorithms for soil-N processes are needed. Variability in N fluxes is extreme and better parameterization and constraint, through use of more detailed agronomic data, would also improve NO3-N simulation in SWAT. Editor's note: This paper is part of the featured series on SWAT Applications for Emerging Hydrologic and Water Quality Challenges. See the February 2017 issue for the introduction and background to the series.

Comments

This article is published as Ikenberry, Charles D., Michelle L. Soupir, Matthew J. Helmers, William G. Crumpton, Jeffrey G. Arnold, and Philip W. Gassman. "Simulation of Daily Flow Pathways, Tile‐Drain Nitrate Concentrations, and Soil‐Nitrogen Dynamics Using SWAT." JAWRA Journal of the American Water Resources Association 53, no. 6 (2017): 1251-1266. doi: 10.1111/1752-1688.12569. Posted with permission.

Rights

Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.

Language

en

File Format

application/pdf

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