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Sujantoko
Institut Teknologi Sepuluh Nopember
Automotive Engineering Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation

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Rip Current Hazard in Klayar Beach, Pacitan, Indonesia: Inferred from Fluorescent Dye and UAV Wahyudi; Hendy Fatchurohman; Verent Priscillia Rahayu Natasya; Sujantoko; Leo Eliasta Sembiring
International Journal of Marine Engineering Innovation and Research Vol. 9 No. 2 (2024)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v9i2.5003

Abstract

South coasts of Java have a unique landscape that exhibits exotic and phantastic natural view which is very attractive as tourist destinations. Therefore, coastal tourism potential in this area is very promising. Despite the fascination of such areas, the existence of rip current in the beach can be very hazardous to the visitors. Klayar Beach (KB) is one of the most popular recreational beaches in Pacitan Regency, East Java Province, Indonesia. However, KB poses a hazard due to rip currents. This paper presents the result of field observations of rip currents utilizing fluorescent dying and unmanned aerial vehicle (UAV). We used UAV multirotor DJI Mavic 2 Zoom with video camera to take and monitor aerial photo and video of rip current flows. The result of this study proves that there is rip currents in KB. It also reveals that the maximum velocity reaches 0.8 m/s, with average width of 11 m, and total length 99.99 m. The rip current type in the KB is defined as headland boundary controlled and predicted as a permanent rip. The use of combined uranine and UAV to investigate rip current in this study was a very effective way. It is suggested to use this approach to improve people understanding about rip current hazard for promoting beach safety.
Hydrodynamic Model Simulation at the Port of Tanjung Rhu Belitung Sujantoko; Pramudya Adhi Pangestu; Dony Saputra; B. P. Putra Ekianto; Hasanudin Ekianto; Nani Kurniati; Rindi Kusumawardhani; Dody Hartanto
International Journal of Marine Engineering Innovation and Research Vol. 8 No. 2 (2023)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v8i2.5198

Abstract

Ports around Belitung Island have an essential role in supporting inter-island shipping activities, which positively impact economic growth. So that predictions to find out the condition of the waters need to be made early to anticipate disruption to the ship's shipping lanes. This study's prediction of these waters was carried out with a hydrodynamic model. Model accuracy (calibration) compares model results with survey data. Based on several iterations, the tidal model and current velocity are obtained with an accuracy rate of 5% and 7%, respectively. These results indicate the model's relatively good level of accuracy because it is below 10%. The model results also found that current velocity and wave height are always higher during high tide conditions than during low tide. In addition, along the Tanjung Rhu shipping channel, the current speed at point A1 experiences a significant difference during high tide conditions, namely 0.285 m/s at high tide, 0.102 m/s at low tide, 0.072 m/s at low tide, and 0.033 m/s s when heading for high tide, because of the narrowing of the water area due to the crush of two landmasses. In addition, areas far from shipping lanes (A1 and A2) have the lowest wave height compared to areas close to shipping lanes (A3). Because the surrounding land slightly covers the two points (A1 and A2), the wave height is smaller than point A3 in more open waters.
Experimental Study of Wave Reflection on A-Jack Armor Unit on Seawall Structure Sujantoko; Pramudya Adhi Pangestu; Widi Agus Pratikto; Mahmud Mustain; Wahyudi Mustain; Hasan Ikhwani
International Journal of Marine Engineering Innovation and Research Vol. 8 No. 2 (2023)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v8i2.5448

Abstract

In planning the construction of a seawall, it is necessary to consider several things, such as incoming waves, types of defensive units, and economic factors. So planning for the type and size of the armor unit used, it is expected that the structure will only experience minimal damage. In addition, there are other considerations, such as wave reflection by the structure. In the port area, a structure with low wave reflection is needed to keep the anchored pool calm. In this study, experimentally, the effect of the reflection coefficient on the seawall structure with the A-Jack armor unit was carried out. The experiment was held in a wave flume with regular waves with variations in height (0,10 – 0,175 cm) and periods (1,4 seconds and 1,6 seconds) of waves with three variations of a structural slope, namely 1:1, 1:1,5, and 1:2. The reflection coefficient analysis was carried out using the two-point methods which were recorded with a wave probe. Based on experiments, it is known that the steeper the slope of the structure will result in a more significant increase in reflection. To improve the accuracy of the spectral variations of the incident and reflected waves, it is necessary to record with three-wave probes because the two-wave probe method has several weaknesses and is prone to interference in analyzing the data obtained.
Study of Changes in Coastal Morphology Due to Utilization of the Surabaya City Coastal Area Sujantoko; Widi Agus Pratikto; Rudi Waluyo Prastianto; Muh. Ilham Maulana; Anggie Vibriyanti
International Journal of Marine Engineering Innovation and Research Vol. 7 No. 1 (2022)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v7i1.5639

Abstract

Indonesia is an archipelagic country with a vast coastal area, so proper management is needed in the development of coastal areas. The city of Surabaya is one of the cities that carry out the development of coastal areas by projecting strategic areas of its coastal areas as regulated in the regional medium-term development plan 2016-2021. The strategic area of the coastal area of Surabaya city is divided into two, namely strategic areas to support economic growth and save the environment. One of the efforts to optimize the development of coastal areas is to examine changes in coastal morphology due to coastal utilization. Analysis of the study was carried out by comparing historical maps of the last 10 years with existing maps from google earth and map analysis using ArcGIS 10.8. The results show that most in the coastal area of north Surabaya there is a change in coastal morphology covering an area of 360,121 m2 as a result of the reclamation of the construction of the Lamong bay port and 623.12 m2 in the coastal area of east Surabaya due to the addition of mangroves. Regular monitoring and improvement efforts on the coast of Surabaya city must be carried out on an ongoing basis, so that coastal threats such as sedimentation and erosion can be minimized.
Co-Authors Anggie Vibriyanti B. P. Putra Ekianto Dody Hartanto Dony Saputra Hasan Ikhwani Hasanudin Ekianto Hendy Fatchurohman Leo Eliasta Sembiring Mahmud Mustain Muh. Ilham Maulana Nani Kurniati Pramudya Adhi Pangestu Rindi Kusumawardhani Rudi Waluyo Prastianto Verent Priscillia Rahayu Natasya Wahyudi Wahyudi Mustain Widi Agus Pratikto