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MPS-FEM Coupled Method for Wave-Induced Vibration of Elastic Ship Hull

ABSTRACT In this paper, a fully Lagrangian meshless method is developed to solve the fluid–structure interaction (FSI) problem. The improved Moving Particle Semi-implicit (MPS) method is applied to simulate the incompressible fluid flow, while the Finite Element Method (FEM) is introduced to predict ...

Bow Lines Optimization Based on Seakeeping by the Approach of Deep Learning and Evolution Strategy

ABSTRACT Seakeeping is a very important indicator for ship performance, the shape of ship is the key factor that affects seakeeping, many researchers have been done a lot of work about it. In this paper, a bow lines optimization method using deep learning and (1+1)-evolution strategy, which are two ...

Development μ-ASV Using Surfboard

ABSTRACT We developed a μ-ASV mounted on a surfboard for coastal surveys and routine tasks. We aimed for an ASV that can be transported by car though out in Japan by reducing the overall length to about 2m and weight to 45kg. Since the basics of this system were completed, we conducted a step response ...

Fishing Activity Prediction from Satellite Boat Detection Data

Monitoring and predicting fishing activity is important for the fishery resource management and the maritime traffic safety. In this paper, we trained deep learning models by grid images from satellite observations to predict areas of fishing activity in next three-day period. The best model predicted ...

Salmonid Antibacterial Immunity: An Aquaculture Perspective

Simple Summary Capture fisheries are reaching their limit, so the increasing demand for fish protein can only be met through aquaculture. One attractive sector within this industry is the culture of salmonids, which are a) uniquely under pressure due to overfishing and b) the most valuable finfish ...

Responses of Salinity Front to Runoff in the South Passage of the Yangtze River Estuary

ABSTRACT A well-validated 2D hydrodynamic and salinity transport model is established in the Yangtze River Estuary (YRE). The numerical performances reveal that: (1) the highest salinity generally occurs after 1h of the flood current slack in the YRE. (2) The pattern of salinity front in the South ...

Wave Hindcast Studies Using SWAN - Comparison with Measured Buoy Data of Western Bay of Bengal

ABSTRACT Wave in the water of western Bay of Bengal was hindcasted using nesting SWAN system for the first time for the cyclone Thane during 25-30 December, 2011. The model results were validated by measured buoy data of Pondicherry and BD11. Simulation results showed reasonable agreement with the ...

Benchmark Tests For Hydrodynamic Simulation of Coastal Waters Using Delft3D-FM

ABSTRACT In coastal waters, algal blooms (the rapid growth of microscopic phytoplankton) are often observed. The resulting oxygen depletion and even poisoning make local fisheries suffer severe damages. The dynamics of harmful algal blooms (HABs) are poorly understood. Novel models applying unstructured ...

Development of Sea Urchin Removal ROV System

ABSTRACT Currently sea desert due to overabundance of sea urchins is occurring worldwide. Iso-yake means the desertlike state of the sea without seaweed. In Japan, such damage is severe, causing an adverse adversely affecting effect on coastal fisheries and the environment. In particular, along the ...

Typhoon Risk Analysis Model Based on Poisson-P-III Compound Extreme Value Distribution

ABSTRACT A basic paradigm of typhoon risk analysis was proposed, which involves the probability distribution of disaster intensity and the disaster loss rate curve. The expected risk value was calculated by integrating the product of these two terms. The innovation lies in the frequency of disasters ...

Experimental Study of Sub-Model of a Kelp Farm With Textile Sheet

ABSTRACT Offshore aquaculture structures such as kelp farm are exposed to environmental loads including winds, waves and currents. A proper design of main components and mooring system, making the structure have sufficient strength capacity withstand the ultimate, accidental and fatigue loads. Additionally, ...

Spatiotemporal Measurement for Strong Current Fields in a Ferry Route Using Coastal Acoustic Tomography

Real-time monitoring of spatiotemporal wave-current fields along busy ferry routes have been strongly required in maritime disaster prevention, including ship accidents. Coastal acoustic tomography (CAT) systems have been frequently applied to various straits, proposed and developed to monitor current ...

A Novel Floating Wind-Solar-Aquaculture Concept: Fully Coupled Analysis and Technical Feasibility Study

ABSTRACT Both offshore wind energy and offshore aquaculture are developing rapidly and moving into deeper waters to acquire better resources. Meanwhile, the offshore solar energy is also drawing more and more attention from the academic communities. A novel concept of a floating wind-solar-aquaculture ...

Experimental Investigation on Flow Patterns Induced by a Twin-Block Perforated Artificial Reef

ABSTRACT Artificial reefs are common human-made structures placed purposefully on the seabed for fishery enhancement and coastal protection. The local flow patterns could be further created and designed by perforated artificial reefs to become more inhabitable for different fish species, which attracts ...

Advances in Simulator for Arctic Marine Structures

ABSTRACT Arctic business is developing within the sectors of marine operations related to offshore oil and gas, mining, seafood, tourism, scientific expeditions, and world trade shipping. As offshore activities in the Arctic is a relatively new field, with only a handful relevant operations to draw ...

Transient inconsistency between population density and fisheries yields without bycatch species extinction

Abstract Recent studies have demonstrated the great advantages of marine reserves in solving bycatch problems by maintaining the persistence (i.e., avoid extinction) of endangered species without sacrificing the fisheries yields of target species. However, transient phenomena rather than equilibrium ...

Feed Supplementation with a Commercially Available Probiotic Solution Does Not Alter the Composition of the Microbiome in the Biofilters of Recirculating Aquaculture Syst...

Recirculating aquaculture relies on the treatment of ammonia compounds from the water by a bacterial flora growing inside biofilters. Another increasingly common practice in aquaculture is the supplementation of feed with live probiotic bacteria to boost the immune system of the farmed animals and hinder ...

Dataset of metal(loid) concentrations recorded in the tissues of two fish species from Flag Boshielo Dam, South Africa

Metal(loid) pollution in aquatic ecosystems has become a cause for concern, particularly in areas where communities depend on services from these systems for their livelihood. This dataset presents the metal(loi) concentrations recorded in the water column, bottom sediment, and tissues of Oreochromis ...

Integration of residents’ experiences into economic planning process of coastal villages: Evidence from the Greater Hangzhou Bay Rim Area

Public value is gaining prominence from both academics and politicians with regards to China’s rural development. However, rural planning authorities and practitioners showed limited confidence on public, which manifests as few public perceptions were integrated into the planning documents. This study ...

Remnant kelp bed refugia and future phase-shifts under ocean acidification

Ocean warming, ocean acidification and overfishing are major threats to the structure and function of marine ecosystems. Driven by increasing anthropogenic emissions of CO2, ocean warming is leading to global redistribution of marine biota and altered ecosystem dynamics, while ocean acidification threatens ...

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