Operational monitoring of the immersion depth of autonomous profiler during probing

by

L.A. Krasnodubets1,2

 1Sevastopol State University, RF, Sevastopol, Universitetskaya St., 33

2Institute of Natural and Technical Systems, RF, Sevastopol, Lenin St., 28

DOI: 10.33075/2220-5861-2024-4-38-46

UDC 621.384 – 027.31                                           

EDN: https://elibrary.ru/isunnj

Abstract:

The paper presents a solution to the problem of operational monitoring of the current immersion depth of an autonomous marine profiler during probing in a stratified ocean environment using an original method of dynamic measurements of the vertical profile of seawater density and the basic equation of hydrostatics. Mathematical relationships are obtained for operational determination of the current depth of the autonomous profiler performing vertical probing of the ocean through the current values of the local density of seawater calculated using the corresponding measurements of the hydrostatic pressure and its derivatives, as well as the geographic latitude of the hydrographic station location. A structure of a dynamic model of the profiling process consisting of a density module and a dynamic “pressure – depth” converter is proposed. The constructed profiling model is implemented in the Simulink visual modeling environment and is equipped with digital and graphic displays that allow monitoring the profiling and data conversion processes. The results of computer modeling of the dynamic measurement processes are presented in the form of graphs of the vertical distribution of seawater density as a function of hydrostatic pressure, and as a function of depth. The value of the absolute error in calculating the ordinates of the seawater density obtained during the modeling is determined. The results can be used for the operational analysis of the state of vertical stratification of the ocean thickness.

Keywords: operational monitoring, dynamic measurements, marine autonomous profiler, seawater density, hydrostatic pressure, computer modeling.

Full text in PDF(RUS)

REFERENCES

  1. Levashov D.E. Tekhnika ekspedicionnyh issledovanij: instrumental’nye metody i tekh-nicheskie sredstva ocenki promyslovo-znachimyh faktorov sredy (Expeditionary research equipment: instrumental methods and technical means for assessing commercially significant environmental factors), Moscow: Izd-vo VNIRO, 2003, 400 p.
  2. Gaisky V.A. Metod opredeleniya glubiny pogruzheniya pribora v more pri zondirovanii (Method for determining the immersion depth of a device in the sea during probing). Sistemy kontrolya okruzhayushchey sredy, 2022, No. 4 (50), pp. 40–45. DOI: 10.33075/2220-5861-2022-4-40-45
  3. Gaisky V.A. Izmeritel’ plotnosti zhidkosti i ego varianty (Liquid density meter and its variants). Pat. No. 2792263. Rossiya, Opubl. 21.03.23, Byul. No. 9.
  4. Paramonov A.N., Kushnir V.M., and Zaikin V.M. Avtomatizaciya gidrofizicheskogo eksperimenta (Automation of hydrophysical experiment), Leningrad: Gidrometeoizdat, 1982, 224 p.
  5. Saunders P.M. Practical conversion of pressure to depth // J. Phys. Oceanogr.1981. 11. P. 573–574.
  6. Krasnodubets L.A. Dinamicheskie izmereniya v zadachah operativnoj okeanologii pri issle-dovanii svojstv okeanskoj tolshchi (Dynamic measurements in operational oceanology problems when studying the properties of the ocean layer). Sistemy kontrolya okruzhayushchey sredy, 2022, No. 1 (47), pp. 56–65. DOI: 10.33075/2220-5861-2022-1-56-65
  7. Krasnodubets L.A. Metod opredeleniya vertikal’nogo profilya plotnosti morskoj vody na osnove izmerenij parametrov dvizheniya neupravlyaemogo morskogo zonda (Method for determining the vertical profile of seawater density based on measurements of the motion parameters of an uncontrolled marine probe). Sistemy kontrolya okruzhayushchey sredy, 2017, No. 10 (30), pp. 8–15.

Loading