Keywords

hydrologic modelling, watershed, stream flow, model evaluation, oms3

Start Date

1-7-2010 12:00 AM

Description

This study reports on the integration of the European J2K-S model (a component-based system for fully distributed simulation of water balance and N dynamics in large watersheds) under the Object Modeling System 3 (OMS3) environmental modeling framework and subsequent evaluation of OMS3/J2K-S performance on the Cedar Creek Watershed (CCW) in northeastern Indiana, USA. Uncalibrated model performance for daily and monthly stream flow response was assessed using Nash- Sutcliffe model efficiency (ENS) and percent bias (PBIAS) model evaluation coefficients. Simulations for nitrogen (N) loadings to Cedar Creek were also performed; however, the OMS3/J2K-S N dynamics sub-model is still undergoing testing so a formal statistical evaluation of this component was not performed. Comparisons of daily and average monthly simulated and observed stream flows for the 1997-2005 simulation period resulted in PBIAS and ENS coefficients ranging from -18.6% to -8.6% for PBIAS and 0.46 to 0.68 for ENS. These values were similar or better than others reported in the literature for uncalibrated stream flow predictions at the watershed scale. The results show that the prototype OMS3/J2K-S watershed model was able to reproduce the hydrological characteristics of the CCW with sufficient quality, and should serve as a foundation on which to better quantify water quality (e.g., N dynamics) at the watershed scale.

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Jul 1st, 12:00 AM

Integrated Agricultural System Modeling Using OMS 3: Component Driven Stream Flow and Nutrient Dynamics Simulations

This study reports on the integration of the European J2K-S model (a component-based system for fully distributed simulation of water balance and N dynamics in large watersheds) under the Object Modeling System 3 (OMS3) environmental modeling framework and subsequent evaluation of OMS3/J2K-S performance on the Cedar Creek Watershed (CCW) in northeastern Indiana, USA. Uncalibrated model performance for daily and monthly stream flow response was assessed using Nash- Sutcliffe model efficiency (ENS) and percent bias (PBIAS) model evaluation coefficients. Simulations for nitrogen (N) loadings to Cedar Creek were also performed; however, the OMS3/J2K-S N dynamics sub-model is still undergoing testing so a formal statistical evaluation of this component was not performed. Comparisons of daily and average monthly simulated and observed stream flows for the 1997-2005 simulation period resulted in PBIAS and ENS coefficients ranging from -18.6% to -8.6% for PBIAS and 0.46 to 0.68 for ENS. These values were similar or better than others reported in the literature for uncalibrated stream flow predictions at the watershed scale. The results show that the prototype OMS3/J2K-S watershed model was able to reproduce the hydrological characteristics of the CCW with sufficient quality, and should serve as a foundation on which to better quantify water quality (e.g., N dynamics) at the watershed scale.