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In article the question of influence of a detail of hydrographic shooting at a size of depths through passage estimated according to sea navigation charts is considered. The main objectives of navigation and control of the vessel which solution are directly connected with completeness, the accuracy and reliability of display of a relief of a bottom on sea navigation charts are listed. Special attention is paid to navigation conditions of navigation of heavy-tonnage vessels in shallow water. The list of crashes of vessels is provided in the Arctic seas connected with insufficient hydrographic study of a relief of a bottom on shallow sites of the Arctic seas. The state-of-the-art review of the works devoted to influence of the major factors influencing assessment of depth through passage in shallow water is executed. Main types of pro-measured works and hydrographic methods of inspection of a bottom which are used for determination of depths through passage are considered. It is noted that only hydrographic sweeping with use of rigid trawls guarantees reliable detection of local raisings of a bottom with dangerous depths. Results use of a rigid trawl when conducting the heavy-tonnage vessel on waterways of East part of the Gulf of Finland described in N.N. Neronov’s article (2001) are given. It is confirmed what at inspection of a bottom by the hydrographic methods based on discrete measurements, values of the minimum depths shown on sea navigation charts can differ from the actual minimum depths. The example of display of the underwater relief on the sea navigation chart received by results of the pro-measured works performed with a different detail is given. Conditions under which the minimum depths displayed on cards can not coincide with the actual minimum depths are defined. The formulas allowing to give a quantitative assessment of a divergence of values of the minimum depths are given. Formulas and an algorithm of taking note of a detail of a measurement are checked for the size of depths through passage on concrete cartographic materials. The main morphometric characteristics of a relief of a bottom influencing the accuracy of estimates are established. The scientific and practical value of the received results is noted and also the main directions of further researches are defined.

vestnik gosudarstvennogo universiteta morskogo i rečnogo flota imeni admirala s. o. makarova/vestnik gosudarstvennogo universiteta morskogo i rečnogo flota imeni admirala s.o. makarova

RESEARCH OF INFLUENCE OF THE DETAIL OF HYDROGRAPHIC SURVEYS ON ASSESSMENT OF DEPTHS THROUGH PASSAGE