The suspended sediment flux along underwater slope of Anapa bay-bar (the Black Sea, Krasnodar region), is calculated. This flux, created under the influence of currents and wind waves, is calculated for the period from 1979 to 2015. Characteristic (i.e., characterizing the order of magnitudes) volumes of material moving along the shore are as follows: from northwest to southeast – 40000 m<sup>3</sup>/year, from southeast to northwest – 15000 m<sup>3</sup>/year. Almost throughout the entire length of the bay bar, there is a predominance of sediment flow directed from NW to SE. The exception is the southern part of the bar, adjacent to Anapa city, which is on average characterized by the prevalence of the flow from the SE to the NW. Change of sign of general sediment transport is observed southwards of the Vityazevo village. The presence of two-directional sediment flow ensures the existence and dynamic equilibrium of the two parallel underwater coastal bars along the Anapa bay-bar.
The paper describes the granulometric characteristics of the large accumulation form sediments (the Anapa Bay-bar). The choice of sampling sites was based on remote sensing data. The analysis of particle size change in 2012 to 2016 has been carried out. The content of carbonate and mineral components in samples collected on the submerge slope has been determined. When comparing the data of 2012 and 2015, it is clear that size structure and composition of sand have not been changed significantly. Analysis of zoobenthos samples shows that the increase in shelly material content is not directly related to the increase in the living mollusks biomass. Sand with a mean particle size of at least 0.3 mm should be used to nourish beaches of the Anapa bay-bar. Smaller material will be washed out to deeper depths or blown away to dunes.
Regular echosounding bottom topography allows to monitoring changes in elevation of the reservoirs bottom and the position of coastline, allows to track the migration of the longshore underwater bars, allows to find many morphometric parameters for hand-made and naturals lakes. In this connection, there is a question of creating a correct and accurate digital elevation models bottom of the reservoirs according to the echosounding data. The article discusses the complex method includes, field and office works. Field works include – bottom topography surveying; shoreline position survey; if necessary, coastal profiles survey, etc. Cameral works include – reduction of all field data into a single system, echosounding data processing, building digital elevation models of bottom, comparing multi-temporal digital elevation models, preparation of various reservoirs parameters using DEM, etc. The article gives examples of different scale digital elevation models of the bottom. The article deals with the problem of comparing multi-temporal data, the problem of using the minimum amount of echosounding data for the optimal DEM and other.