Utilization of data mining classification techniques to identify the effect of Madden-Julian Oscillation on increasing sea wave height over East Java Waters

Abstract

East Java BPBD data recorded 18 marine accidents in 2018, which increased by 1 event compared to the previous year. It is interesting to study the waters around East Java which are divided into 9 regions. The wind is a major factor in the high wave generation, but the contribution of weather phenomena triggered by the marine environment is important to identify. Phenomenon such as Madden-Julian Oscillation (MJO) has a cycle through the Indonesia territory, becomes a factor that should be suspected. MJO identification uses the Real-Time Multivariate MJO (RMM)-1 and RMM-2 index, which can be combined with the wind speed data using data mining classification techniques to get the thresholds value of wave height data obtained from the analysis of Windwave-05 model. The classification is helped by WEKA’s machine learning algorithm, by determining 4 selected classification algorithms including Naïve Bayes, J48, JRip, and Multi-Class Classifier. The data validation using the K-fold cross-validation method with a number of folds is 10 units. The accuracy value of the best algorithm obtained in each waters region ranges from 63.02% to 84.50%. The overall accuracy value increases by 0.24% to 4.41% compared to only using wind factors, except for the Waters of Bawean Island and Masalembu Islands.

Influence of Environmental Factors on Prey Discrimination of Bait-Attracted White Sharks from Gansbaai, South Africa

“…During the observations, the following environmental factors were recorded by the same operator every three hours from arrival at the sampling area until the end of daily observations: Sea conditions were divided according to the Douglas scale of wave height [ 25 ]: “Calm”, which included glassy and rippled (0–10 cm wave height). “Slightly rough”, which included smooth, slight, and moderate (11–250 cm wave height).…”

“…Sea conditions were divided according to the Douglas scale of wave height [ 25 ]: “Calm”, which included glassy and rippled (0–10 cm wave height). “Slightly rough”, which included smooth, slight, and moderate (11–250 cm wave height).…”