Abstract
In coal-fired or nuclear power plants installed at the seaside, turbine efficiency is directly dependent on sea water temperature (SWT). Given the long-term average climatic conditions, the cooling medium temperature plays an important role in the design of any power plant. Therefore, the efficiency in electricity generation is significantly affected as instantaneous changes in seawater temperature will cause the cooling environment design temperature of the plant to deviate. In this respect, accurate SWT estimation plays an important role for electrical output from power plant applications. In this study, various machine learning approaches namely fuzzy C-means clustering (FCM), grid partition (GP), subtractive clustering (SC)-based adaptive neuro-fuzzy inference system (ANFIS), and long short-term memory (LSTM) neural network were used to make one-day ahead SWT predictions. Analyses were made using 5-year daily mean SWTs measured by Turkish State Meteorological Service between 2014 and 2018 at 3 different stations (Mersin, Izmir, and Samsun provinces) on the coasts of the country. Mean absolute error (MAE), root-mean-square error (RMSE), and correlation coefficient (R) were used as evaluation criteria. According to the daily SWT prediction, the best results for MAE, RMSE, and R values were obtained for Mersin as 0.1003 °C, 0.1654 °C, and 0.999594, respectively, with ANFIS-GP model; for Izmir as 0.1754 °C, 0.2638 °C, and 0.998962, respectively, with ANFIS-SC model; and for Samsun as 0.2716 °C, 0.3629 °C, and 0.998285, respectively, with LSTM model.
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Abbreviations
- SWT:
-
Sea water temperature
- ANFIS:
-
Adaptive neuro-fuzzy inference system
- FCM:
-
Fuzzy c-means
- GP:
-
Grid partition
- SC:
-
Subtractive clustering
- LSTM:
-
Long short-term memory
- MAE:
-
Mean absolute error
- RMSE:
-
Root-mean-square error
- R :
-
Correlation coefficient
- MFs:
-
Membership functions
- A, B :
-
Fuzzy clusters
- f :
-
Single output
- x, y :
-
Inputs
- p, q, r :
-
Architectural parameters
- J :
-
Objective function
- c :
-
Cluster center
- D :
-
Number of data points
- N :
-
Number of data clusters
- M :
-
Total number of separated fuzzy subsets
- h :
-
Output
- e :
-
Exponent
- \(\odot\) :
-
Hadamard product
- µ :
-
Cluster membership value
- \(\sigma\) :
-
Gate activation function
- m :
-
Fuzzy partition matrix exponent
- n :
-
Dimension
- i :
-
Input gate
- f :
-
Forget gate
- g :
-
Cell candidate
- o :
-
Output
- t :
-
Time step
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Acknowledgements
The author would like to thank the Turkish State Meteorological Service for allowing the use of the sea water temperature data in this research.
Funding
The author received financial support from the Office of Scientific Research Projects of Cukurova University for this project under contract no. FBA-2021–14004.
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Ozbek, A. Prediction of daily sea water temperature in Turkish seas using machine learning approaches. Arab J Geosci 15, 1625 (2022). https://doi.org/10.1007/s12517-022-10893-x
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DOI: https://doi.org/10.1007/s12517-022-10893-x