The Department of Civil and Environmental Engineering is pleased to announce Wenwei Xu's MS Thesis Defense: "Development of a Steady-State River Hydrodynamic and Temperature Model Based on CE-QUAL-W2."
Date: Monday, December 9, 2013
Location: Engineering Building 310
Adviser: Dr. Scott Wells
CE‐QUAL‐W2 is a 2‐D hydrodynamic and water quality model that has been applied to reservoirs, lakes, river systems, and estuaries throughout the world. However, when this model is applied in shallow water systems, it requires a much longer calculation time to maintain numerical stability, compared to the applications in reservoirs or deeper river systems.
To solve this problem, a new hydrodynamic and temperature model, which allows for steady‐state hydrodynamic computations, was built based on the framework of CE‐QUAL‐W2. By calculating the hydrodynamics at steady‐ state, the time step for stability is relaxed and simulations can proceed at much longer time steps. The rest of the model framework was still used, such as temperature. Manning's equation was used for computing the water surface elevation.
This new model was tested on three reaches in the Willamette River Basin. The results showed that the model was able to reduce computing time by 90%, while predicting dynamic temperature with high accuracy. This new model will be used to simulate the future of the Willamette River System at decadal or centennial timescales, addressing river temperature concerns and fish habitat issues.