bluuebunny/crossref_metadata_2025_split huggingface dataset:
Modeling of Sediment Distribution and Changes of Morphology in Estuary Flow Kapuas River, West Kalimantan
Authors: Catherine L A , Pratikto W A , Suntoyo  
Published: March 2021

Abstract
Pontianak Dwikora Port is a port that has been owned by Pontianak City since the Dutch colonial era and has been used as a trade center to export and import goods needed by West Kalimantan Province. Dwikora Port is located inside the Kapuas Kecil River and under the auspices of PT Pelabuhan Indonesia II (PELINDO II). Due to the location of the port in the river, the shipping channel is often disrupted due to silting (sedimentation) at the river mouth. So that the ships do not run aground, periodic dredging is carried out. This is to find out how much sediment is in the estuary. So, this study continues previous research by performing numerical modeling using Mike 21 software [1] to determine the sediment distribution flow patterns that affect silting that occurs in the Kapuas Kecil River Estuary. The data to be used are tidal data from field measurements, wind data from BMKG, wave generation data, river discharge, and TSS from previous research journals. The TSS used is derived from the river with the maximum taken from previous studies, namely 0.63 gr / L. The result is that the flow pattern of sediment distribution is strongly influenced by the confluence of flow patterns from rivers and sea. Sediment originating from the river slows down at the estuary as a result of the width of the river and is held back by waves from the sea, coupled with the tidal effect that occurs, the sediment oscillates and settles on the bottom of the mouth of the Kapuas Kecil River, causing changes in the basic morphology of the estuary.
Tsunami Wave Transformation in Selesung Bay (Lampung)
Authors: Gelfi Mustarakh , Kencana Elsa Rizkiya , Achiari Hendra 
Published: March 2021

Abstract
The 2018 Sunda Strait tsunami is categorized as a volcano tsunami that happens due to Mount Anak Krakatau’s flank collapse. The modeling effort with this kind of tsunami is challenging. Selesung bay is located in Legundi Island, one of the suffered islands from the tsunami in the Krakatoa water area. This research tries to do a local scale simulation of the bay’s tsunami waves using shallow water wave simulation software. The model permits wave transformation simulation in the bay from the offshore side to the coastal point. The result presents that the inundation height of the tsunami in Selesung bay is a combination of wave height (1.5 m), water depth (1.65 m), and wave set-up (0.2 m). Those properties are summing up 3.4 m modeled inundation height, which is committing to less than 1% error from the measured data of 3.38 m. The model also gives an insight into the diffracted wave condition in Selesung bay with a wave height of 2.8 m and a wave period of up to 25 s. All in all, the model shows a good agreement with measured data and permits the benchmarking points for further study.
Technical Analysis of Diesel Engine Convert to Dual Fuel Engine for the Ship
Authors: Semin  , Cahyono B , Kusuma I R 
Published: March 2021

Abstract
Fossil fuel is the high-cost price. This trend of price is increasing and not stable. For the future is need alternative low cost and stable price fuel. Natural gas has low cost and stable price for alternative fuel. The objective of this paper is to analyze the effect of diesel engine converted to dual fuel engines using. The method of this paper is a mixture of HSD with CNG conducted on the ship diesel engine. The conversion is determining additional components required. Then, the reduction of the cargo for two cars for cylinder placement used. After the engine has been changed to dual fuel, the performance investigated. The performance investigation is based on the variation of HSD and CNG fuel composition in the engine. The result has shown that the best performance is when the 30: 70 of CNG: HSD mixture composition.
An Experimental Study on Hydraulic Model of Water Intake Canal at Steam and Gas Power Plants
Authors: Suntoyo  , Muslim Taufiq Wibawa , Wicaksana Febrian Tegar , Rahmawati Shade , Silvianita  
Published: March 2021

Abstract
The performance of the canal water intake used in the Gas and Steam Power Plant (PLTGU) cooling system is carried out by testing the physical model of the water intake canal with a 1:15 scale model. In which, the canal water intake prototype has dimensions of length, L = 33.30 m, width, B = 13.40 m and height, T = 11.67 m, scaling the prototype dimensions to the model dimensions is done by complying with Froude’s law. The purpose of this paper is to determine the flow patterns that occur in the physical model and the minimum elevation allowed based on applicable guidelines [1]. The variables measured in this study were the flow velocity in the canal and also the visual documentation of the flow pattern in the canal including the formation of vortices. Tests were carried out on three variations of tidal elevation, namely HWL, MSL and LWL. The experimental results show that the flow pattern in the channel varies with depth with an average Reynolds Number value = 3.5 × 104. Vortex formation occurs at all elevations where the vortex is formed in the area near the pump. The observations show that the critical elevation of the canal is at H = 0.29 m for the model and H = 4.35 m for the prototype.
Hydrodynamic Properties of a Moored Floating Breakwater using CFD Approach
Authors: Abdullah S.F. , Fitriadhy A. , Mohd M.H. , Rahman M.A.A. , Suntoyo  , Kurniawan A. , Pratikto W. 
Published: March 2021

Abstract
In presence of complex-hydrodynamic interaction between water wave and moving structure, a reliable method that can analyse nonlinear phenomena is necessarily required. This paper presents numerical investigation of a moored floating breakwater using computational fluid dynamic (CFD) approach. The mathematical model is based on the extended Reynolds Average Navier-Stokes (RANS) solver for solid-porous obstacle. A high amplitude wave with several wave periods were deliberately considered in the simulation to allow nonlinear wave effects on the floating structure such as wave breaking, overtopping, including viscous friction. Here, the two fluid calculation method for interface boundary between water and air is proposed to capture the complex free surface changes. In addition, the fractional average volume obstacle representation (FAVOR) using partial cell treatment method is employed to simulate the motion of breakwater boundary on the free surface. Approximations and validations on the hydrodynamic properties of the structure have been carried out which include wave transmission coefficient, sway, heave, pitch, and mooring forces. The results show that the CFD model can fairly simulate well on hydrodynamics of the floating breakwater. The discrepancies between numerical and experimental data can be partly attributed to the nonlinearity in the incident wave definition.
Analysis of Leading Edge Protuberances on Fully Submerged Hydrofoil of 15 m Pilot Boat
Authors: Chrismianto D , Santosa AWB , Wirahutama A 
Published: March 2021

Abstract
Resistance greatly affects on selection of the main engine and ship fuel consumption. To achieve the speed of the ship, the ship must be prepared to overcome resistance in the waters to be passed by choosing the right engine according to the needs of the ship. In the last few years there have been many studies on biomimetics or the use of systems in nature to be applied in a technology. Such as the use of Leading edge protuberances. Despite its large size and stiff flexibility, the humpback whale has a good maneuver even when chasing prey compared to other animals of its size. This study aims to obtain the highest lift force result and the smallest resistance with a hydrofoil model configuration of leading edge protuberances which resembles a humpback whale fin (megaptra novaengliae). The Computational Fluid Dynamics (CFD) is applied to analyse lift faorce and ship resistance of all models variation. The results indicates that from all variation of models at the Fn 1.356, the model has 5 ° angle of attack were able to reduce the total resistance value of Pilot Boat by 35.13%.
The Effect of Additional Subsea Floater on Mooring Line Tension and Motion of CBM (Conventional Buoy Mooring) Ø 4.5 m
Authors: Mursid O , Malau K R , Huda N , Abidin A M A , Sutarno G 
Published: March 2021

Abstract
Single point mooring of Conventional Buoy Mooring (CBM) is an offshore mooring structure where the mooring line attached from bow of ship to CBM. Lack buoyancy on CBM needed Additional subsea floaters to increase buoyancy of CBM. Time domain simulation on Moses software version 11 used to calculate the effect of the variation number of subsea floaters to chain tension and CBM Motion. The result is a single configuration subsea floater has higher tension and extreme motion than multiple configuration subsea floaters.
Identification of Free Span on Underwater Pipeline using Side Scan Sonar and Dual-head Scanning Profiler
Authors: Pratomo Danar G , Khomsin  , Harlambang P L 
Published: March 2021

Abstract
Indonesia is a country that has an important role in the oil and gas industry. Considering this important role, it is necessary to conduct an inspection and safety inspection to support the sustainability of the oil and gas industry in Indonesia.. In this study the method used is the processing of side scan sonar (SSS) and dual-head scanning profiler (DHSP) data obtained from PT. Pageo Utama. Side scan sonar data is used as a visual representation of the pipeline while dual-head scanning profiler data is used to obtain the topography of the sea and surrounding pipes to identify the dimensions of the free span. The result of this study shows 47 free spans from a 6.8 km underwater pipeline. Free span with the longest dimension is FS-43, with length of 42.109 m and height of 0.44 m, which is located at KP 6.045. Free Span with the highest dimension is FS-45, with height of 1.22 m and length of 20.329 m, which is located at KP 6.465.
Methane Emissions Evaluation on Natural Gas/Diesel Dual-Fuel Engine during Scavenging Process
Authors: Felayati F M , Semin  , Cahyono B 
Published: March 2021

Abstract
Natural gas/diesel dual-fuel engine is known as a solution for shipping industries to simultaneous reduces NOx and PM emissions nowadays. Unfortunately, high HC emissions are produced, especially at low loads conditions. However, there are two possibilities for the source of HC emissions from the engine, namely during the combustion process and during the scavenging process. This study evaluates the methane emissions (part of HC emissions) concentration during the scavenging process. Cold flow engine simulations are evaluated and validated to this study at low load condition using natural gas injection at intake port during valve overlap. Moreover, several natural gas injection timings are conducted to observe the effect on the methane emissions concentrations at exhaust port after the exhaust valve closed. The natural gas penetration is nearly after the intake valve closed (IVC) thus the natural gas enters the combustion chamber at the next intake cycle. It observed that the scavenging process contributes to the methane emissions formation on natural gas/diesel dual-fuel engine using intake port natural gas penetration after IVC. Besides, the concentration of methane emissions during the scavenging process has very low contribution than the combustion process. It is possibly a variation of the methane emissions concentration in the other valve lift profile and natural gas injection strategies. Thus, it recommends to widely observing how significant the methane emissions generated during the scavenging process on the other engines with those variations.
Conceptual design of the LNG dual-fuel system for harbour tug towards Indonesia Greenport
Authors: Fathallah A Z M , Ariana I M , Putra G H , Ma’ruf B 
Published: March 2021

Abstract
Declaration of several large ports as Greenport indicates that increasing the environmental concern of port operatio n in Indonesia. Harbour tug as one of the port’s operational supports is also required to contribute low emissions. One method to reduce exhaust emissions from tugboats is to replace the use of fuel oil with natural gas. This study describes the conceptual design of a dual-fuel LNG system at the harbour tug vessel for operational needs at the Indonesian port. The 2x2500 HP Harbour Tug, which is the case in this study, uses a dual fuel diesel engine as a prime mover with a direct mechanical propulsion system. Study optimization considering the operational mode of a prime mover will determine the LNG storage capacity, due to harbour tug vessel operation and space capacity as well as of bunkering system. The design parameters for the main components of the fuel system, such as the Regasification Unit, Gas Valve Unit are essential considerations to support the system’s operation optimally.
Study of shoreline evolution under the influence of jetty construction: A case study of Karangsong Beach, Indramayu, Indonesia
Authors: Abdurrahman U , Park H , Suprijo T 
Published: March 2021

Abstract
Karangsong Beach, Indramayu located on the north coast of Java Island of Indonesia has been an important traditional small downstream river port for the fishermen who live in the Indramayu District area. This traditional port has been rehabilitated by construction of jetty in the period 2005 to 2007. The jetty construction affected coastal process, which was previously dominated by erosion turned into dominated by accretion. This study examines the process of shoreline evolution by calculating the sediment transport rate and analyzing the shoreline changes. The analysis began by extracting shoreline data from Google Earth images to provide a historical database of shoreline. The coastal process was then simulated using the coastline model Uniform Beach Sediment Transport Coastline (UNIBEST-CL) with waves and the longshore component of tidal currents as input and also calibrated using the shoreline database. The calibrated model was employed to simulate the annual conditions over a nine-year period, 2008-2017. The results show the sediment transport rate is dominated by the southeast direction. There is a significant difference in coastal processes between northern and southern regions, which is due to the presence of jetty. In the northern region, the sediment transport rate was blocked by the jetty so that this region is accreted. In the southern region, the supply of sediment from the north replaced by sediment supply from the river causes accretion yet smaller than the northern region.
Variation of Seasonal Monsoon Wave-Driven Circulation Pattern in the Lee of Groyne in Kuala Nerus beach
Authors: Zulfakar M S Z , Ariffin E H , Akhir M F , Awang N A 
Published: March 2021

Abstract
Terengganu coast tend to dual monsoonal as presenting Northeast Monsoon (NEM) as a storm season and Southwest Monsoon (SWM) as a calm season. The area of interest is a groyne in Kuala Nerus, Terengganu on east part of Peninsular Malaysia. The use of numerical model was performed on the dual monsoon seasons with MIKE 21 modules (Spectral Wave FM and Flow Model Hydrodynamic FM modules). Two numerical model were set up according to the two season. The resulting model indicates, the current circulation pattern consisted of persistent eddy re-circulation in the lee of the groyne during both season. As the longshore current directed into the groyne, it deflected offshore resulting in rip current along the groyne. The rip current and incoming wave converge at the tip of the groyne and flow parallel to coastline before being projected onshore performing a re-circulation cell. During NEM, the model shows a clockwise re-circulation cell and counter-clockwise formation during SWM. The formation of the rip current and eddy circulation is associated with erosion event as the sediment transported offshore causing sediment shortage on the adjacent shore. The importance of this study can be a reference to any development of coastal defense monsoon dominated environment.
Hybrid Photovoltaic-Thermal Solar System for Brackish Water Reverse Osmosis
Authors: Fitri Sutopo Purwono , Baheramsyah Alam , Santoso Agoes , Santoso Yudhi Satrio 
Published: March 2021

Abstract
In this paper, a hybrid combination of solar thermal collector and photovoltaic (PV) solar system was applied to reverse osmosis (RO) desalination plant to increase the energy efficiency and its sustainability. An experimental study was performed on 75 GPD small scale RO plant using processed brackish/saline groundwater in Kenjeran area. It shows that increasing in temperature of feed raw water results a decrease in pump pressure and the consumption of electrical power. The smallest result of pump pressure which is 40 psi and the smallest electrical power consumption which is 1.68 W were obtained when the temperature is at 40 °C. However, the quality of the product, the amount of water, and the ability of the membrane to recover salt are decreasing when the temperature of the feed water is raised. The best result was obtained at 31 °C with a TDS water product quality of 105 ppm, the amount of produced water was 36.5 L, and a salt rejection ability was 95.9%. The electrical power consumption of whole system for one day was 914.63 Watt-hours and requires six units of 155 Watt-peak capacity of PV panels.
The Study of Coastline Changing and Total Suspended Solid Distribution Based on The Remote Sensing Data in Teluk Lamong Multipurpose Port Terminal
Authors: Pratikto Widi Agoes , Fitriadhy Ahmad , Maulana Muhammad Ilham , Huda Abiyani Choirul , Putri Destyariani Liana , Simatupang Liany Ayu , Wahyudi Nazariano Rahman , Laksono Rendatiyarso , Dewi Anggie Vibriyanti Rossari 
Published: March 2021

Abstract
Looking forward to the abovementioned conditions, this research is needed to elaborate on the effects of the reclamation to the marine resources in Teluk Lamong Multipurpose Port Terminal as the reclaimed product. In order to describe the impact of the port development, this study will analyze the shoreline changing, the current pattern modeling, as well as the Total Suspended Solid (TSS) modeling using the remote sensing data. The several numbers of expected objectives through this study are to get the set of scientific information on the shoreline changing in Teluk Lamong Multipurpose Port Terminal in the year of 2012 and 2020, to get the figure of current pattern in Teluk Lamong Multipurpose Port Terminal in the year of 2012 and 2020, and to elaborate TSS concentration through the modeling approach in Teluk Lamong Multipurpose Port Terminal in the year of 2012 and 2020. Hence, there is a set of methodologies and tools to cooperate with the information before and after the reclamation. The use of the Digital Shoreline Analysis System (DSAS) software to analyze coastline conditions. The using of Mike 21 to analyze the current pattern and TSS concentrations. In addition to the TSS analysis, it will also need a set of remote sensing data from the Google Earth Engine (GEE). The modeling and calculation give information about the End Point Rate (EPR) values and TSS values. The EPR values are 107.5 m/year, 59,625 m/year and 10,375 m / year. The TSS values are 0-20 mg/L, 20.1-40 mg/L, 40.1-80 mg/L, 80.1-120 mg/L and >120.1 mg/L. Moreover, the result shows the different values among the length of coastline, the current pattern, and TTS in the years 2012 and 2020. The difference in the coastline reaches 950 m at this latest 8 years. While it also brings the changing to the current pattern and sediment transport which show through its current velocity and sediment content per liter of seawater during high and low tide accordingly.
Mesh Planning Optimization for Urban Distribution Network with High Reliability
Authors: Zhou Y J , Ding H , Shi T Q , Fang R C , Wang Y W , Bie F M 
Published: March 2021

Abstract
Modern distribution network has a huge volume and a wide range of points, so the difficulty of construction and transformation of distribution network often lies not in technological innovation, but in the operability of planning scheme, adaptability and flexibility of network structure. Therefore, an optimization model of mesh planning for high reliability power supply in urban power grid is proposed. Firstly, the planning process is optimized to avoid the cyclic adjustment of power supply mesh and power supply unit division. Secondly, a target network architecture and power supply unit partition model for medium-voltage power grid are proposed, which can meet the double power demand of important power users and ensure no cross-supply between units. Finally, an example of mesh planning in a city center in Hubei Province of China is given, and the application of the optimization method is described in detail. The results show that the method is easy to carry out, and effectively improves the reliability of power supply in urban power grid.
Development and Application of Real-Time Online Monitoring System for Long Transportation of Large Power Transformer
Authors: Zhou H B , Zhang Z X , Xie Z X , Li W T , Zhou Z C 
Published: March 2021

Abstract
A set of transportation process monitoring system for large power transformer transportation is developed, including transportation state intelligent acquisition terminal, monitoring system platform software and mobile app. The effectiveness of the system is verified in the actual transportation monitoring of converter transformer. It solves a series of problems existing in traditional methods, ensures the transportation safety of large electric power equipment and reduces the investment.
Experimental Investigation on Water Droplet Impacting Liquid Film on Inclined Wetted Surface
Authors: Chen J J , Liu Q F , Zhang F , Zhao F L , Qu J Y 
Published: March 2021

Abstract
The secondary carry-over of the droplet and liquid film in the steam-water separator can influence the separation efficiency of the separator. The generation of the secondary droplets resulting from droplets impacting the water film of the wetted surface is one of the mechanisms of secondary carry-over. Therefore, the experimental investigation on water droplet impacting liquid film on inclined wetted surface is conducted through high-speed video camera. The subsequent form and evolution process once the droplet colliding with the inclined liquid film are obtained. The droplet splashing phenomenon and mechanism are explained. The qualitative analysis of influence of the initial droplet diameter, velocity and the inclination angle of the wet surface on the splashing behavior is conducted. The results reveal that with increasing angle of inclination of the wet surface, the critical velocity to generate the splashing phenomenon increases accordingly; the increasing initial droplet diameter leads to decreasing critical velocity; the splashing phenomenon is more likely to appear in cases with higher impacting velocity, larger initial droplet diameter and smaller inclination angle, under which conditions the number of secondary droplets generated increases and the splashing phenomenon is more obvious. The obtained experimental results are significant to the study of steam-water separation and can lay basis on design of the separator.