Open-File Report 2008–1171
The Romanian government is interested in understanding the effects of existing and future mining activities on long-term dispersal, storage, and remobilization of sediment-associated metals. An initial Soil and Water Assessment Tool (SWAT) model was prepared using available data to evaluate hypothetical failure of the Valea Sesei tailings dam at the Rosia Poieni mine in the Aries River basin. Using the available data, the initial Aries River Basin SWAT model could not be manually calibrated to accurately reproduce monthly streamflow values observed at the Turda gage station. The poor simulation of the monthly streamflow is attributed to spatially limited soil and precipitation data, limited constraint information due to spatially and temporally limited streamflow measurements, and in ability to obtain optimal parameter values when using a manual calibration process. Suggestions to improve the Aries River basin sediment transport model include accounting for heterogeneity in model input, a two-tier nonlinear calibration strategy, and analysis of uncertainty in predictions.
Posted June 2008
Friedel, M.J., and Linard, J., 2008, Initial sediment transport model of the mining-affected Aries River Basin, Romania: U.S. Geological Survey, Open-File Report 2008–1171, 23 p.
Description of the Study Area
Land Use and Soils
Climate and Streamflow
Model Calibration and Validation
Suggestions for Model Improvement
Spatial Precipitation and Temperature
Spatial Soil Parameters
Point Sources and Sinks
Sensitivity Analysis and Nonlinear Regression
Summary and Conclusions