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2 TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

2 2025

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Use of an ROV with Modulated Lighting for Diagnosing the Technical Condition of Submerged Port Wharf Structures

Kaizer Adam, Lednicka Barbara, Tessmer Agnieszka, Freda Włodzimierz, Soszyńska- Budny Joanna, Ziajka Ewelina

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

2025

Vol. 19 No. 2

477--482

The technical condition of underwater port structures is critical to the safety and longevity of maritime infrastructure. Traditional inspection techniques, such as diver-assisted surveys, are constrained by safety risks, limited duration, and reduced efficiency in turbid waters. This study explores the application of a remotely operated vehicle (ROV) equipped with modulated lighting systems to enhance visibility and facilitate high-resolution imaging in optically complex underwater environments. The experiment employed a CHASING M2 ROV, modified with red, green, and white lighting configurations, to inspect the quay wall of a port. The impact of lighting color on image quality was evaluated. Results indicate that modulated lighting tailored to the optical properties of turbid coastal waters can improve image contrast and facilitate defect detection. The findings highlight the potential for advanced ROV systems to augment underwater inspection protocols in challenging optical environments.

Impact Study of Shipyard Limitations to Designed Floating Dock Construction

Denev Yordan

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

2025

Vol. 19 No. 2

531--536

The development of modern marine technology requires flexibility in design and high-quality craftsmanship. To some extent, this necessitates considering the various limitations imposed by shipbuilding enterprises. These limitations influence ships' and marine equipment's construction, characteristics, and operational behavior. The article analyzes the impact of production constraints on a steel floating dock's design and strength characteristics. The strength properties of the facility, determining its suitability for use, have been analyzed using the MARS 2000 software. Two structural models of a floating dock have been developed—one with imposed width constraints and the other without constraints, with the same lifting capacity. It turns out that in the structure with constraints, the strength characteristics are close to those determined by the regulations. This provides grounds to claim that the geometric constraints of small and medium sized enterprises(SME)s do not always negatively impact the structural qualities of floating objects.