Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
The impact of objective function formulation on the optimal calibration of QUAL2E
Download
index.pdf
Date
2005-05-09
Author
GÖKTAŞ, RECEP KAYA
Aksoy, Ayşegül
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
199
views
0
downloads
Cite This
Successful calibration and verification of a model is important to confirm its usage for water quality predictions. Instead of trial-and-error approach, optimization techniques can be used to adjust the biological, chemical, and kinetic parameters in a more efficient way. In this study, a genetic algorithm (GA) is used to calibrate and verify QUAL2E for the reaeration coefficient (K2) and the sediment oxygen demand rate (K4) with reference to dissolved oxygen (DO) observation data. Three different objective functions were used to investigate the impact of formulation itself on the performance of the optimization models. The results show that for the river system considered in this study, objective function formulation may have an impact for a successful outcome.
Subject Keywords
Calibration
,
QUAL2E
,
Genetic algorithms
,
Optimization
,
Water quality modeling
,
Verification
URI
https://hdl.handle.net/11511/42104
DOI
https://doi.org/10.1061/40792(173)343
Collections
Department of Environmental Engineering, Conference / Seminar
Suggestions
OpenMETU
Core
Application of genetic algorithms for calibration and verification of QUAL2E model
Göktaş, Recep Kaya; Aksoy, Ayşegül (null; 2004-07-01)
Traditional trial-and-error methods make the calibration and verification of a model considerably time consuming. In addition, it is doubtful whether the best results will be achieved. However, by use of optimization techniques in calibration and verification, the best kinetic parameter estimates can be obtained in a shorter time period. In this study, a genetic algorithm (GA) is used to determine the reaeration coefficients for QUAL2E. An objective function, defined by sum-of-least-squares, is used in orde...
A fast and automated hydrologic calibration tool for SWAT
ÖZDEMİR, AYFER; Leloğlu, Uğur Murat (2019-11-01)
In order to apply hydrological models in the water resources investigation successfully, careful calibration and uncertainty analysis are required. Although many automatic calibration methods were developed, the time consumed for running the hydrologic model is still a problem for hydrologic modelers. To reduce the computational complexity and increase performance of the calibration procedure, a software package (Fast Automated Calibration Tool, FACT) that works on Soil and Water Assessment Tool (SWAT) was ...
The effect of mass transfer limitations on the optimization of groundwater remediation strategies
Aksoy, Ayşegül (1998-06-10)
The effect of mass transfer limitations on the optimization of groundwater remediation strategies was investigated by linking a ground water simulation model into a Genetic Algorithm (GA) optimization technique. Runs were performed to minimize pumping and treatment costs associated with pumping rates and air stripping tower performance. Remediation designs for a hypothetical aquifer, contaminated with trichloroethylene (TCE), assuming either linear equilibrium or two-site kinetic sorption, are compared. Res...
Calculation of the specific heat close to the first-order and second-order phase transitions in ammonium halides
Yurtseven, Hasan Hamit (2000-10-01)
This study presents our calculation of the specific heat C-v1 under the prediction of an Ising model. For this calculation we used our observed Raman frequencies for the l'5LO (177 cm(-1)) mode of NH4Br, the v(5)TO (144 cm(-1)) and v(1)TA (93 cm(-1)) modes of NH4Cl close to the first-order phase transitions (P = 0). We also calculate the specific heat Cvi using our observed Raman frequencies for the v(1)TA (93 cm(-1)) mode of NH4Cl close to the second-order phase transition (P = 2.8 kbar) in this crystallin...
New methodologies for optimal operation of water distribution systems for water quality purposes
Altan Sakarya, Ayşe Burcu; Mays, LW (1998-01-01)
Two new methodologies have been developed for determining the optimal operation of water distribution systems for water quality purposes. These methodologies are based upon describing the operation as a discrete time optimal control problem that can be used to determine the optimal operation schedules of the pumps in distribution systems. One solution methodology is based upon a mathematical programming approach and the second methodology is based upon a simulated annealing approach. These two methodologies...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
R. K. GÖKTAŞ and A. Aksoy, “The impact of objective function formulation on the optimal calibration of QUAL2E,” 2005, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/42104.