Technical Papers
Jun 27, 2020

Variable Infiltration-Capacity Model Sensitivity, Parameter Uncertainty, and Data Augmentation for the Diyala River Basin in Iraq

Publication: Journal of Hydrologic Engineering
Volume 25, Issue 9

Abstract

To construct a valid model, hydrologists face challenges in determining sensitivity to the forcing data and uncertainty in model parameters. These require basin data and forcing data from different sources, which may be incommensurate. The study reported here calibrated the Variable Infiltration-Capacity (VIC) platform to quantify model result sensitivity to model parameters and uncertainty in those parameters. The modeled basin was the Diyala River in Iraq, above the Derbendikhan Dam. The study produced the first complete set of daily forcing data for the basin using different sources. Besides ground observations from the Iraqi Ministry of Water Resources, two additional data sources were tested: Tropical Rainfall Measurement Mission (TRMM) and Global Implemented Data (GIDAL). Several methods were implemented to adjust the data, and model sensitivity and parameter uncertainty were examined by Generalized Likelihood Uncertainty Estimation (GLUE) and Differential Evolution Adaptive Metropolis (DREAM). Neither of these techniques had been applied before in Iraq. The VIC model was then calibrated manually using Kling–Gupta efficiency (KGE). The analyses indicate that neither TRMM nor GIDAL data are adequate for gridded precipitation analysis in the study basin. TRMM tends to underestimate and GIDAL tends to overestimate actual data. Multiplicative random cascade and Schaake Shuffle were used to determine daily precipitation data. A set of correction equations was developed to adjust GIDAL temperature and wind speed. Results for the GLUE and DREAM analyses imply that the depth of the second soil layer is the parameter that causes the most sensitivity in the model. The VIC model outputs were calibrated on a daily timescale with a KGE average of 0.743.

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Data Availability Statement

Some or all data, models, or code used during the study were provided by a third party. Direct requests for these materials may be made to the provider as indicated in the Acknowledgments. The data implemented in this study can be shared and conjugated with approval from the MoWR.

Acknowledgments

This study was funded by the Iraq Higher Committee for Education Development (HCED). The authors are grateful to the Iraqi Ministry of Water Resources for assistance. Data and models can be downloaded online (TRMM: https://pmm.nasa.gov/data-access/downloads/trmm; VIC, RVIC, GIDAL, and NND: https://uw-hydro.github.io/code/). The authors are also thankful to the editors and reviewers who offered insightful comments leading to the improvement of this paper. The authors are also grateful to Colorado State University for providing its laboratories and supercomputer to run the model(s) and perform the analyses.

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Journal of Hydrologic Engineering
Volume 25Issue 9September 2020

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Received: Oct 31, 2019
Accepted: Apr 10, 2020
Published online: Jun 27, 2020
Published in print: Sep 1, 2020
Discussion open until: Nov 27, 2020

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Graduated Student, Dept. of Civil and Environmental Engineering, Colorado State Univ., 400 Isotope Dr., Fort Collins, CO 80521 (corresponding author). ORCID: https://orcid.org/0000-0002-7938-7011. Email: [email protected]
Neil S. Grigg, F.ASCE [email protected]
Professor, Dept. of Civil and Environmental Engineering, Colorado State Univ., 400 Isotope Dr., Fort Collins, CO 80521. Email: [email protected]
Jorge A. Ramirez, M.ASCE [email protected]
Deceased March 28, 2020; formerly, Professor, Dept. of Civil and Environmental Engineering, Colorado State Univ., 400 Isotope Dr., Fort Collins, CO 80521. Email: [email protected]

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