# Maximum Safe Parameters of Ships in Complex Systems of Port Waterways
## 5 Conclusions  
The article presents a new method for determining the maximum safe parameters of ships in existing complex port waterway systems and the conditions for safe ship operations.  
The developed method can be described with the following general procedure:  
1. The determination of maximum safe lengths of ships in specific turning basins and ship drafts;  
\begin{table}
\begin{tabular}{c c c c} \hline \hline \multirow{2}{*}{**T\({}_{1}\) + T\({}_{2}\)**} & \multicolumn{3}{c}{**B\({}_{1}\) + B\({}_{2}\) [m]**} \\ \cline{2-4}  & \multicolumn{3}{c}{**Slope Inclination**} \\ \cline{2-4}  & **1:2** & **1:3** & **1:4** \\ \hline
8 & 32 & 40 & 47 \\
9 & 31 & 38 & 45 \\
10 & 30 & 36 & 43 \\
11 & 29 & 34 & 41 \\
12 & 28 & 33 & 39 \\
13 & 27 & 32 & 37 \\
14 & 26 & 31 & 35 \\
15 & 25 & 30 & 34 \\
16 & 24 & 28 & 32 \\
17 & 23 & 27 & 30 \\
18 & 22 & 26 & 28 \\
19 & 21 & 25 & 27 \\
20 & 20 & 23 & 25 \\ \hline \hline \end{tabular}
\end{table}
Table 2: Determination of safe breadths of passing ships in straight sections of the Swinoujscie-Szczecin fairway.  
2. The waterway division between turning basins, depending on the maximum length of ships turned there;
3. The determination of maximum lengths and breadths of ships safely maneuvering in fairway bends (turns) between the turning basins;
4. The determination of maximum safe breadths of ships in straight fairway sections between the turning basins;
5. The determination of the allowable speed of ships in specific fairway sections;
6. The determination of ship parameters in two-way traffic lanes;
7. The determination of conditions for the safe operation of ships in a complex port waterway system.  
The prosed method was used for the determination of conditions for the safe operation of ships on the modernized 68-kilometer Swinoujscie-Szczecin fairway. The modernization of the fairway resulted in deepening the channel from 10.5 m to 12.5 m and an appropriate widening of the channel. By dredging the fairway to 12.5 m, the maximum permissible draught of vessels calling at Szczecin was increased to approx. 11.0 m (before 9.15 m), and, thus, the availability of the Szczecin port to a certain group of large vessels was ensured. There will be no need for them to be discharged at Swinoujscie before continuing on to the Szczecin port.  
The results were used to draw up detailed port regulations defining the conditions for safe fairway operations of ships heading for the ports of Swinoujscie, Szczecin, Police and Skolwin.  
Conceptualization, S.G.; methodology, S.G.; software, M.G., R.G. and M.P.; validation, S.G.; formal analysis, S.G., M.G., R.G. and M.P.; investigation, S.G., M.G., R.G. and M.P.; resources, R.G. and M.P.; data curation, M.G, R.G. and M.P.; writing--original draft preparation, S.G.; writing--review and editing, M.G., R.G. and M.P.; visualization, M.P.; supervision, S.G.; project administration, R.G. and M.P.; funding acquisition, M.G., R.G. and M.P. All authors have read and agreed to the published version of the manuscript.  
This research received no external funding.  
Not applicable.  
The authors declare no conflict of interest.