Algorithmic support of the system for express analysis of vertical stratification of ocean water

by

L.A. Krasnodubets1,2

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

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

  E-mail: lakrasno@gmail.com

DOI: 10.33075/2220-5861-2023-1-135-142

UDC 621.384 – 027.31                                                                                            

Abstract:

   The results of the development and modeling of algorithmic support for a system for express analysis of the vertical stratification of ocean waters, designed for the use in operational oceanology, are presented. The purpose of this analysis is to build in real time during the dive of the profiler probe numerical arrays of the main characteristics of stratification – the distributions of the total and thermohaline vertical stability of water layers, as well as the corresponding vertical distributions of the Väisälä-Brunt frequency of thermohaline oscillations in the stratified ocean medium as functions of hydrostatic pressure. Numerical arrays of vertical stratification characteristics as the results of express analysis are formed directly from current synchronous measurements of seawater density and its increment in situ, as well as the speed of sound as a function of hydrostatic pressure, obtained in one sounding. In the course of modeling, as an object of measurements, a simulation model of the ocean environment with vertical density stratification and the corresponding speed of sound in sea water, developed on the basis of real data of profile measurements obtained during a hydrographic station in the Black Sea, was used. Verification of the models of processes of dynamic measurements and express analysis was carried out by computer simulation in the MATLAB & Simulink environment. Illustrations of the results of computer simulation obtained using the proposed algorithmic software are presented in the form of graphs of the distributions of thermohaline vertical stability and the corresponding distribution of the Väisälä-Brunt frequency of thermohaline oscillations, as well as vertical distributions of the density of seawater and the speed of sound in this water as functions of hydrostatic pressure.

Keywords: algorithm, stratification, vertical stability, Väisälä-Brunt frequency, profiling probe, seawater density, sound speed, computer simulation.

To quote: 

Full text in PDF(RUS)

REFERENCES

  1. Fedorov K.N. Tonkaya termokhalinnaya struktura vod okeana (Fine thermohaline structure of ocean waters). L.: Gidrometeoizdat, 1976, 184 p.
  2. Yegorov N.I. Fizicheskaya okeanografiya (Physical oceanography). L.: Gidrometeoizdat, 1974, 456 p.
  3. Zelen’ko A.A. Operativnaya okeanologiya: modelirovaniye, monitoring i prognozirovaniye gidrofizicheskikh poley Mirovogo okeana (Operational oceanology: modeling, monitoring and forecasting of the hydrophysical fields of the World Ocean. Dis. d-ra phys.-math. thesis). Sevastopol, 2018, 251 p.
  4. Bukatov A.A., Pavlenko Ye.A., Solovey N.M. Regional’nyye osobennosti rasprede-leniya chastoty Vyaysyalya–Brenta v moryakh Laptevykh i Vostochno-Sibirskom (Regional Features of the Väisälä-Brent Frequency Distribution in the Laptev and East Siberian Seas). Morskoy gidrofizicheskiy zhurnal, 2019. Vol. 35, No. 5, pp. 437–448.
  5. Rodin A.V. Okeanologicheskiye protsessy i promyslovyye skopleniya pelagicheskikh ryb (Oceanological processes and commercial concentrations of pelagic fish. Dis. d-ra geograf. thesis). S-Peterburg, 2000, 259 p.
  6. Arkhipkin V.S., Dobrolyubov S.A. Okeanologiya. Fizicheskiye svoystva morskoy vo-dy (Oceanology. Physical properties of sea water). Moscow: Izd-vo Yurayt, 2020, 216 p.
  7. Mamayev O.I. Morskaya turbulentnost’ (Marine turbulence). Moscow: Izd-vo MGU. 1970. 204 p.
  8. Stewart Robert H. Introduction to Physical Oceanography. Independent Publishing Platform. 2014, 354 p.
  9. Millard R.C., Owens W.B., and Fofonoff N.P. On the calculation of the Brunt-Vaisala frequency. Deep-Sea Res., 1990, Vol. 37, No. 1, pp. 167–181.
  10. Krasnodubets L.A. Metod opredeleniya vertikal’nogo profilya plotnosti morskoy vody na osnove izmereniy parametrov dvizheniya neupravlyayemogo avtonomnogo zonda (Method of determining the vertical profile of seawater density on the basis of measurements of the parameters of the movement of the uncontrollable autonomous probe). Sistemy kontrolya okruzhayushchey sredy, 2017, No. 10, pp. 8–15.
  11. Krasnodubets L.A. Mnogotselevaya informatsionno-izmeritel’naya sistema dlya vertikal’nogo profilirovaniya okruzhayushchej sredy (Multipurpose information-measuring system for vertical profiling of the ocean environment). Sistemy kontrolya okruzhayushchey sredy, 2021, No. 1 (43), pp. 54–60. DOI: 10.33075/2220-5861-2021-1-54-60.

Loading