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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/gmd-2018-268
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2018-268
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Development and technical paper 30 Nov 2018

Development and technical paper | 30 Nov 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

A Conceptual Framework for Integration Development of GSFLOW Model: Concerns and Issues Identified and Addressed for Model Development Efficiency

Chao Chen1, Sajjad Ahmad2, and Ajay Kalra3 Chao Chen et al.
  • 1Department of Geosciences, Boise State University, Idaho, USA
  • 2Department of Civil and Environmental Engineering and Construction, University of Nevada, Las Vegas, USA
  • 3Department of Civil and Environmental Engineering, Southern Illinois University, USA

Abstract. In Coupled Groundwater and Surface-Water Flow (GSFLOW) model, the three-dimensional finite-difference groundwater model (MODFLOW) plays a critical role of groundwater flow simulation, together with which the Precipitation-Runoff Modeling System (PRMS) simulates the surface hydrologic processes. While the model development of each individual PRMS and MODFLOW model requires tremendous time and efforts, further integration development of these two models exerts additional concerns and issues due to different simulation realm, data communication, and computation algorithms. To address these concerns and issues in GSFLOW, the present paper proposes a conceptual framework from perspectives of: Model Conceptualization, Data Linkages and Transference, Model Calibration, and Sensitivity Analysis. As a demonstration, a MODFLOW groundwater flow system was developed and coupled with the PRMS model in the Lehman Creek watershed, eastern Nevada, resulting in a smooth and efficient integration as the hydrogeologic features were well captured and represented. The proposed conceptual integration framework with techniques and concerns identified substantially improves GSFLOW model development efficiency and help better model result interpretations. This may also find applications in other integrated hydrologic modelings.

Chao Chen et al.
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Short summary
This study proposed a conceptual framework for development of integrated surface and groundwater flow model, GSFLOW. Study provides guidance on addressing common challenges in the model development, i.e., model conceptualization, data exchange, model calibration, and sensitivity analysis. An application of the framework demonstrated that both model development efficiency and hydrologic characterization improved. The proposed framework can be useful for other similar modeling efforts.
This study proposed a conceptual framework for development of integrated surface and groundwater...
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