Krupov I. Increasing of the navigation efficiency by dredging areas of waterways hydrographic landscape.

Krupov I.V. Increasing of the navigation efficiency by dredging areas of waterways hydrographic landscape. Dissertation for the degree of Doctor of Philosophy in specialty 271 – Marine and Inland Water Transport (field of knowledge 27 – Transport). – National University "Odessa Maritime Academy" of the Ministry of Education and Science of Ukraine, Odesa, 2025. The dissertation research is aimed at solving a scientific and applied problem – increasing the efficiency of navigation in coastal sea and river areas during dredging operations. The main motivation for the conducted research is the current demands of practice: • ensuring the effectiveness of navigation during the deepening of sections of the hydrographic landscape of waterways; • timely implementation of technological works to maintain and restore fairways, canals and ship passages; • increasing the energy and environmental efficiency of dredging vessels. The main task of the scientific research is to increase the energy and environmental efficiency of the dredging process of coastal sea and port water areas. To solve the main task of the research, the following auxiliary tasks were performed: 1) modeling of non-stationary processes of changing the bottom landscape part of coastal water areas; 2) experimental determination of changes in the hydrodynamic landscape of the seabed; 3) determination of the criterion for assessing the safety of the dumping process of sea / river soil; 4) determination of the criteria for assessing the safety of navigation during dredging operations. As a result of solving the main and auxiliary tasks of the study, a scientific proposition was formulated: increasing the efficiency of using dredging vessels during their operation in areas of intensive shipping is ensured by choosing a rational period for performing dredging works while simultaneously reducing their duration, energy costs for their provision and emissions of harmful components caused by their conduct. The scientific novelty of the work lies in the fact that increasing the efficiency of using dredging vessels is ensured by choosing rational schemes for carrying out the dredging process, taking into account monitoring changes in the hydrographic state of fairways, channels or ship passages in real time. As a result of the research, for the first time: • it was proposed to perform experimental determination of changes in the hydrodynamic landscape of the seabed by measuring the channel profile taking into account the joint movement of all vessels (both dredging and those that are part of the caravan); • as criteria for assessing navigation safety during dredging operations, the time criterion, the criterion of consumed power, and the criterion for determining carbon dioxide emissions were proposed. Improved technologies include: • the technology for performing measurement work to determine the hydrodynamic landscape of the sea; • the technology for distributing power between the main and auxiliary power units during the dredging process. Further developed technologies include: • the technology for determining the energy indicators of the propulsive complex of a dredging vessel; • the technology for determining the environmental indicators of the operation of the main and auxiliary power units during the dredging process. The practical significance of the obtained results lies in: • an algorithm for determining energy costs associated with the dredging process is proposed; • a technology for conducting dredging works taking into account changes in the hydrodynamic landscape of the seabed is proposed.