Dissertation/Thesis
Development of a Steady-State River Hydrodynamic and Temperature Model Based on CE-QUAL-W2
| Τίτλος: | Development of a Steady-State River Hydrodynamic and Temperature Model Based on CE-QUAL-W2 |
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| Συγγραφείς: | Xu, Wenwei |
| Πηγή: | Dissertations and Theses |
| Στοιχεία εκδότη: | PDXScholar |
| Έτος έκδοσης: | 2014 |
| Συλλογή: | Portland State University: PDXScholar |
| Θεματικοί όροι: | Hydrodynamics -- Mathematical models -- Case studies, Water quality -- Mathematical models, Water temperature -- Mathematical models, Water Resource Management |
| Περιγραφή: | 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 for shallow systems, this model requires a long calculation time to maintain numerical stability, compared to applications of reservoirs or deeper river systems. To solve this problem, a new hydrodynamic and temperature model was built based on the framework of CE-QUAL-W2 but that allows for steady-state hydrodynamic computations. By calculating the hydrodynamics at steady-state, the time step for stability is relaxed and simulations can proceed at much higher time steps. The rest of the model framework is still used for water quality state variables, in this case, temperature. The algorithm used for computing the water surface elevation is Manning's equation. This thesis study is one part of the Willamette Water 2100 project (Santelmann et al., 2012), which examines hydrological, ecological, and human factors affecting water scarcity in the Willamette River Basin. This study included three stages: (1) Convert six existing CE-QUAL-W2 V3.1 models into a newer version: CE-QUAL-W2 V3.7. (2) Develop the steady-state model code in FORTRAN. (3) Test the steady-state model on three river systems in the Willamette River Basin at Year 2001 and 2002. The result proved that the steady-state model could reduce the computing time by 90% for river applications, while predicting dynamic river temperature with high accuracy at a two-minute time scale. This new model will be employed to simulate the future of the Willamette River System at a decadal or centennial timescales, addressing river temperature concerns and fish habitat issues. |
| Τύπος εγγράφου: | Thesis |
| Περιγραφή αρχείου: | application/pdf |
| Γλώσσα: | English |
| Relation: | https://pdxscholar.library.pdx.edu/open_access_etds/1619; https://pdxscholar.library.pdx.edu/context/open_access_etds/article/2618/viewcontent/Xu_psu_0180E_11015.pdf |
| DOI: | 10.15760/etd.1618 |
| Διαθεσιμότητα: | https://pdxscholar.library.pdx.edu/open_access_etds/1619 https://doi.org/10.15760/etd.1618 https://pdxscholar.library.pdx.edu/context/open_access_etds/article/2618/viewcontent/Xu_psu_0180E_11015.pdf |
| Rights: | In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). |
| Αριθμός Καταχώρησης: | edsbas.F5844507 |
| Βάση Δεδομένων: | BASE |
| DOI: | 10.15760/etd.1618 |
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