DEVELOPMENT OF A METHOD FOR MAPPING THE BOTTOM OF SHALLOW RESERVOIRS BY LASER BATHYMETRY

Abstract

The article is devoted to the development of methods for mapping the bottom of shallow reservoirs by laser bathymetry. It is noted that the main factors influencing the depth of laser bathymetric studies are the correct choice of the emitter wavelength, turbidity of sea water, especially in coastal zones and undulation of the sea surface. The problem of developing a method for mapping the bottom relief of shallow-water reservoirs is formulated and solved. A laser installed on board the aircraft is used as an emitter. It is noted that one of the main problems in laser bathymetry is the issue of modeling the seabed. While the surface of various reservoirs is currently modeled by various continuous functions, such as Hermite polynomials, B-splines, etc., modeling of reflection from the bottom of a reservoir is mainly limited to a diffuse model, i.e. The bottom is considered as a Lambert reflector Based on the geometric representation of the course of optical rays in laser bathymetry and the analysis of known measurement results, a step model of the bottom of the reservoir is proposed, the height and width of the steps of which vary widely. Based on the wellknown method of mapping the bottom of a shallow reservoir from one point, as well as the proposed step model of the bottom of the reservoir, a method for mapping the relief of the bottom irregularity has been developed, according to which measurements are carried out at two spatial points, with respect to which the difference in the depth of the reservoir should be determined. At the same time, measurements are carried out using a laser beam of constant power and at constant nadir angles, model studies have shown that the measurement error of the proposed method is within ±4.5%.