An innovative modeling approach using Qual2K and HEC-RAS integration to assess the impact of tidal effect on River Water quality simulation
Journal
Journal of Environmental Management
Journal Volume
90
Journal Issue
5
Pages
1824-1832
Date Issued
2009
Author(s)
Abstract
Water quality modeling has been shown to be a useful tool in strategic water quality management. The present study combines the Qual2K model with the HEC-RAS model to assess the water quality of a tidal river in northern Taiwan. The contaminant loadings of biochemical oxygen demand (BOD), ammonia nitrogen (NH3-N), total phosphorus (TP), and sediment oxygen demand (SOD) are utilized in the Qual2K simulation. The HEC-RAS model is used to: (i) estimate the hydraulic constants for atmospheric re-aeration constant calculation; and (ii) calculate the water level profile variation to account for concentration changes as a result of tidal effect. The results show that HEC-RAS-assisted Qual2K simulations taking tidal effect into consideration produce water quality indices that, in general, agree with the monitoring data of the river. Comparisons of simulations with different combinations of contaminant loadings demonstrate that BOD is the most import contaminant. Streeter-Phelps simulation (in combination with HEC-RAS) is also performed for comparison, and the results show excellent agreement with the observed data. This paper is the first report of the innovative use of a combination of the HEC-RAS model and the Qual2K model (or Streeter-Phelps equation) to simulate water quality in a tidal river. The combination is shown to provide an alternative for water quality simulation of a tidal river when available dynamic-monitoring data are insufficient to assess the tidal effect of the river. © 2008 Elsevier Ltd. All rights reserved.
Subjects
HEC-RAS; Qual2K; Streeter-Phelps; Tidal river; Water quality modeling
SDGs
Other Subjects
ammonium compound; assessment method; biochemical oxygen demand; estimation method; modeling; phosphorus; pollution monitoring; river water; water level; water pollution; water quality; Environmental Monitoring; Fresh Water; Models, Theoretical; Oxygen; Rivers; Seawater; Taiwan; Water Movements; Water Pollutants, Chemical
Type
journal article