HYDRAULICS. ENGINEERING HYDROLOGY. HYDRAULIC ENGINEERING

Impact of sea waves on underwater fish-breeding cages

Vestnik MGSU 2/2014
  • Pilyaev Sergey Ivanovich - Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Professor, Department of Hydraulic Structures, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Gubina Nadezhda Andreevna - Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Assiciate Professor, Department of Hydraulic Structures, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 171-178

Cultivation of sea objects is of great importance while solving the problems of providing the constantly growing requirements of the national economy with sea products. Cultivation of sea objects uses special hydrobiotechnical constructions. As the practice showed, cultivation of seafood is commercially impossible without solving the questions of calculating and designing such constructions. In special literature these questions are poorly covered or not considered at all. In the article the results of theoretical and pilot studies of waves influence on hydrobiotechnical constructions is provided, in particular on underwater fish-breeding cages.This article offers the theoretical solution to the problem of determining the efforts of the ropes holding the fish tank under wave influences. In order to solve this problem, the equations of hard drives movements were set up and the differential equations of free oscillations of buzz were obtained.When determining the horizontal movements, the four different configurations of connections and the system motion directions in general are possible in case of waveoscillations. Next step is the solution of the differential equations and determination of natural oscillation frequency in the direction of the vertical axis. Defining efforts in the ropes from their own weight (static calculation) is self-explanatory, it should be noted that accounting for the weighing influence of water on such structures does not have significant influence.Further the authors defined loading and efforts from the regular waves’ impacts.Modeling of the waves influence on submersible fish tank was carried by Fraud method. The studies were conducted with two models with large and small mesh. The signals of strain gauge sensors were registered by electronic measuring equipment.When comparing the theoretical and experimental data, satisfactory results have been obtained. It was determined that in order to improve the calculation methods it is appropriate to carry out an additional series of experiments for the refinement of the permeability coefficient, which is included in the calculation of the wave load.

DOI: 10.22227/1997-0935.2014.2.171-178

References
  1. Pilyaev S.I., Murav'ev V.B. Issledovanie vozdeystviya voln na model' podvodnogo rybovodnogo sadka [Research of the Waves Influence on the Model of Underwater Fishbreeding Cage]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2010, special edition, no. 1, pp. 37—42.
  2. Pilyaev S.I. Osobennosti modelirovaniya volnovykh protsessov na akvatoriyakh portov [Features of Wave Processes Modeling on Water Areas in Ports]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2010, no. 4, vol. 2, pp. 30—35.
  3. Stokes G.G. On the Theory of Oscillatory Waves. Mathematical and Physical Papers. Cambridge, 1880, vol. 1, pp. 197—229. DOI: 10.1017/CBO9780511702242.013.
  4. Michell J.H. The Highest Waves in Water. Phil. Mag. Ser. 5, 1993, vol. 36, pp. 430—437.
  5. Krylov Yu.M. Spektral'nye metody issledovaniya i rascheta vetrovykh voln [Spectral Methods of Investigation and Calculation of Wind Waves]. Leningrad, Gidrometeoizdat Publ., 1966, 256 p.
  6. Longuet-Higgins M.S., Cockelet E.D. The Deformation of Steep Surface Waves on Water: Part I. A Numerical Method of Computation. Proceedings of the Royal Society. London, 1976, vol. A342, pp. 157—174. DOI: 10.1098/rspa.1976.0092.
  7. Lappo D.D., Strekalov S.S., Zav'yalov V.N. Nagruzki i vozdeystviya vetrovykh voln na gidrotekhnicheskie sooruzheniya [Loads and Impacts of Wind Waves on the Hydraulic Structures]. Leningrad, VNIIG im. B.E. Vedeneeva Publ., 1990, 432 p.
  8. Kozhevennikov M.P. Gidravlika vetrovykh voln [Hydraulics of Wind Waves]. Moscow, Energiya Publ., 1972, 263 p.
  9. Sretenskiy L.N. Teoriya volnovykh dvizheniy zhidkosti [Theory of the Wave Motions of Fluid]. 2-nd edition. Moscow, Nauka Publ., 1977, 816 p.
  10. Krylov Yu.M., Strekalov S.S., Tseplukhin V.F. Vetrovye volny i ikh vozdeystvie na sooruzheniya [Wind Waves and their Impact on Buildings]. Leningrad, Gidrometeoizdat Publ., 1976, 256 p.

Download

Applicability of various wave movement theories for calculating hydrobiotechnical constructions in the conditions of relative shoal

Vestnik MGSU 3/2014
  • Pilyaev Sergey Ivanovich - Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Professor, Department of Hydraulic Structures, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Gubina Nadezhda Andreevna - Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Assiciate Professor, Department of Hydraulic Structures, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 228-235

Technological features of cultural reproduction of seafood presuppose the use of hydrobiotechnical constructions. Calculations of the loadings and impacts on sea hydrobiotechnical constructions demand a reasonable choice of a hydromechanical theory of wave movement. In the article the theories of two-dimensional regular linear and nonlinear waves are considered: the theory of small amplitude waves; Stokes' wave theory (the second order of approximation); the theory of final height waves of the first, second and third order of approximation. The dependences for determining speeds and accelerations of liquid particles are given. The comparison results of various theories of regular waves and fields of their application are stated. The authors offer the expressions for engineering calculations of kinematic characteristics of regular waves at a final depth. In recent years, cage culture fishery has received the predominant development in marine aquaculture, because its creation do not require large investments. Calculation of loads and impacts of waves on the shore hydraulic structures under extreme conditions require justified choice of hydro-mechanical theory of wave motions. This article gives a comparison of the various theories of regular waves, both linear and nonlinear and evaluates the applicability of them from the point of view of engineering use and actual conditions. However, the theory of small amplitude waves is widespread both in theoretical studies and engineering application, due to its sufficient simplicity and the fact that the linearity of the theory of small amplitude waves allows using the method of summing elementary solutions in the process of finding potential wave motion. The choice of one or another wave theory in marine facilities calculations of regular waves impact depends on the type of design, ease of using wave theory in calculations, type of the considered impact, applicability of the different wave theories in order to correctly describe the characteristics of wave motion in different wave zones.

DOI: 10.22227/1997-0935.2014.3.228-235

References
  1. Pilyaev S.I. Osobennosti modelirovaniya volnovykh protsessov na akvatoriyakh portov [Features of Modeling Wave Processes on Water Areas of Ports]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2010, no. 4, vol. 2, pp. 89—97.
  2. Sretenskiy L.N. Teoriya volnovykh dvizheniy zhidkosti [The Theory of Wave Motions of Fluid]. 2nd edition. Moscow, Nauka Publ., 1977.
  3. Krylov Yu.M. Spektral'nye metody issledovaniya i rascheta vetrovykh voln [Spectral Methods of Research and Calculation of Wind Waves]. Leningrad, Gidrometeoizdat Publ., 1966, 256 p.
  4. Kozhevennikov M.P. Gidravlika vetrovykh voln [Hydraulics of Wind Waves]. Moscow, Energiya Publ., 1972, 263 p.
  5. Lappo D.D., Strekalov S.S., Zav'yalov V.N. Nagruzki i vozdeystviya vetrovykh voln na gidrotekhnicheskie sooruzheniya [Loads and Impacts of Wind Waves on Hydraulic Structures]. Leningrad, VNIIG im. B.E. Vedeneeva Publ., 1990, 432 p.
  6. Krylov Yu.M., Strekalov S.S., Tseplukhin V.F. Vetrovye volny i ikh vozdeystvie na sooruzheniya [Wind Waves and their Impact on Structures]. Leningrad, Gidrometeoizdat Publ., 1976.
  7. Aleshkov Yu.Z., Ivanova S.V. Difraktsiya voln dvumya vertikal'nymi stenkami [Waves Diffraction by Two Vertical Walls]. Voprosy teorii i rascheta vetrovykh voln i ikh vozdeystviy na gidrotekhnicheskie sooruzheniya: trudy koordinatsionnogo soveshchaniya po gidrotekhnike [Questions of the Theory and Calculation of Wind Waves and their Impacts on Hydraulic Engineering Structures]. Leningrad, Energiya Publ., 1973, no. 84.
  8. Stokes G.G. On the Theory of Oscillatory Waves. Mathematical and Physical Papers. Cambridge, 1880, vol. 1, pp. 197—229. DOI: 10.1017/CBO9780511702242.013.
  9. Michell J.H. The Highest Waves in Water. Phil. Mag. Ser. 5. 1993, vol. 36, pp. 430—437.
  10. Longuet-Higgins M.S., Cockelet E.D. The Deformation of Steep Surface Waves on Water. I. A Numerical Method of Computation. Proceedings of the Royal Society. London, 1976, vol. A342, pp. 157—174. DOI: 10.1098/rspa.1976.0092.

Download

Results 1 - 2 of 2