Key Sources of Uncertainty in QUAL2E Model of Passaic River
- 1 March 1996
- journal article
- Published by American Society of Civil Engineers (ASCE) in Journal of Water Resources Planning and Management
- Vol. 122 (2), 105-113
- https://doi.org/10.1061/(asce)0733-9496(1996)122:2(105)
Abstract
Application of stream water-quality models in decision making has been hampered by a lack of data appropriate for minimization of model-simulation uncertainty. A method for determining data needed to reduce model-prediction uncertainty is illustrated in this paper. First-order reliability analysis is applied to determine (1) the model parameters that significantly affect model-prediction uncertainty; and (2) the constituents for which model-prediction uncertainty is unacceptable. Additional data are required to reduce uncertainty in the parameters that significantly affect constituents with high prediction uncertainty and consequently in model prediction. The method is demonstrated for multiconstituent water-quality modeling on the Passaic River in New Jersey applying QUAL2E. The model-prediction uncertainty of dissolved oxygen, biochemical oxygen demand, ammonia, and chlorphyll a is considered. For this example, only the reaeration rate and the algal maximum-specific-growth rate contribute significant uncertainty to model prediction. The effect of reducing the uncertainty in the reaeration rate and algal maximum-specific-growth rate on the uncertainty on predicted dissolved oxygen and chlorphyll a , respectively, is demonstrated.Keywords
This publication has 14 references indexed in Scilit:
- Improved First‐Order Uncertainty Method for Water‐Quality ModelingJournal of Environmental Engineering, 1992
- An improved first-order reliability approach for assessing uncertainties in hydrologic modelingJournal of Hydrology, 1992
- Water quality modeling: A review of the analysis of uncertaintyWater Resources Research, 1987
- Modeling sediment and water column interactions for hydrophobic pollutants. Parameter discrimination and model response to input uncertaintyWater Research, 1984
- Uncertainty Analysis of Dissolved Oxygen ModelJournal of the Environmental Engineering Division, 1982
- A comparison of sensitivity analysis and error analysis based on a stream ecosystem modelEcological Modelling, 1981
- THE USE OF A SIMPLE MODEL AND UNCERTAINTY ANALYSIS IN LAKE MANAGEMENT1Jawra Journal of the American Water Resources Association, 1979
- PROBABILISTIC METHODS IN STREAM QUALITY MANAGEMENT1Jawra Journal of the American Water Resources Association, 1975
- Reaeration in open-channel flowPublished by US Geological Survey ,1972
- The aeration capacity of streamsCircular, 1967