The aim of the research was to create a decision-making model, which would be able to support planning, organizing and conducting the dredging works in the port area. The proposed solution is a multiple element system which enables to verify, in a comprehensive way, the majority of the aspects determining the quality and the time of dredging enterprise realization. The paper presents an original approach to the decision-making process during the organization of dredging works, using the computer program. In order to achieve the main goal of the study, the conditions of dredging works were considered. Furthermore, the factors that have an influence on the schedule of the project were evaluated and algorithms, as well as process organization schemes, were developed. If it is not enough, the decision models corresponding to the discussed issue were analysed and the computer program was created. And last but not the least, the proposed project and equipment were verified using a simulation model. While creating this model, the method of multiple criteria AHP (Analytic Hierarchy Process) decision support was used. Moreover, the mass service model with the priority queue regulations, the expert study, and statistical analysis of the traffic flow, were provided. The model was developed in reliance to multiple criteria studies, based on the opinions of multinational experts. These enabled to adjust each element of the system in accordance with various locations. As a result of the research, the following thesis has been proven, that detailed analysis of the conditions of dredging works and taking into account the received conclusions enables to reduce the costs and shorten the time of dredging projects realizations.

The aim of the article is to analyse the transport accessibility of the Tri-City seaports as well as to verify the necessity of starting the inland navigation. The proposal to develop inland navigation by creating new and developing existing waterways is supported by the idea of sustainable transport, which emphasizes how important it is to improve the efficiency of transport work and to minimize the harmful impact of transport on the environment. The purpose of the study is to determine the capability to increase the cargo capacity of the Port of Gdansk and the Port of Gdynia. The article presents the results of the operational analysis from the navigation and manoeuvring simulator Navi-Trainer Professional 5000, where scenarios that the barge from Tri-City seaports reaches the planned dry port in Zajączkowo Tczewskie have been made. This concept intends to verify the option of relieving truck traffic in the Tri-City area.

Small-size dredgers are used as a standard for dredging and maintaining the depth of the fairways to seaports, as well as of the ports themselves. These vessels are characterized by limited draft and a low freeboard. The safety of such craft, in terms of their stability, in relation to the conducted works is ensured by the observance of appropriate regulations and requirements. The use of these ships requires navigation between the ports in which they operate. Open sea navigation poses a threat to such vessels. The article presents two characteristic cases of overturning of vessels during sea towing. The requirements of existing freeboard regulations regarding the stability and stability of dredgers do not provide them with a sufficient level of safety at sea. Phenomena such as longitudinal and lateral swaying, wave boarding and dynamic action of the wind may lead to their overturning. The article deals with the problem of the influence of particular phenomena that threaten the stability of dredgers during sea navigation. The analysis of static and dynamic stability for various characteristic shapes of small dredgers is presented. The possibility of water entering the watertight compartments was also taken into account. The research was presented on the numerical models of dredgers. The main purpose of this paper was to assess the risks and possibilities of capsizing of small dredgers designated for port work and redevelopment during their sea voyage.

Climate change caused by CO₂ emissions, the depletion of oil resources, and their unequivocal association with road transport constitute the primary factors behind the development of the electromobility sector. Simultaneously, existing infrastructure limitations and specific aspects of the social perception of electric vehicles may pose significant barriers to this sector’s growth in Poland, one of the fastest-growing economies in Europe. Therefore, this study aims to identify the level of diffusion of expert opinions regarding battery electric vehicles (BEVs) among vehicle users, in the context of user convenience (functionality) and their environmental impact, and to analyse the variability and determinants of these opinions. The obtained results are intended to serve as a basis for initiating actions to identify the limitations in the development of this automotive sector in Poland. Our study results indicate that the level of diffusion of expert opinions regarding BEVs among respondents is high. In contrast, opinions about these vehicles’ usability are more consistently internalised than those concerning their environmental impact. Moreover, this study demonstrates that limited financial resources and low levels of education among potential car buyers constitute barriers to developing this segment of the automotive market in Poland.

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.