Hydraulic Structures: Fourth Edition

14.12.3 Cross-flow oscillations It is shown in Fig. 14.22 that the peak response of the cylinder in the cross- flow direction oc ...

OSCILLATIONS OF CYLINDERS IN WAVES 617 If the above non-linear term for the damping force is used, it is impossible to solve equ ...

When a small rigid cylinder is free to move in waves, the response equa- tion is similar to equation (14.73). For the inline osc ...

WORKED EXAMPLES 619 Hs(m) 000.5 001.0 01.5 02.0 02.5 03.0 03.5 04.0 4.5 5.0 5.4 Number of waves (Hs) 340128847348371815621 Esti ...

P(H) versus Hsis plotted on probability paper for the log-normal dis- tribution (Fig. 14.26). The interval of measurement is 1 d ...

WORKED EXAMPLES 621 Solution The external diameter of the pipe is 275 32  200 507 mm. The weight of concrete is 1/4π(0.507^2 ...

The in-line force on the pipe per unit length is 71.8 | 0.5 1.4 sint| (0.5 1.4 sint) 322.3 cost(N m^1 ). The lift force per u ...

WORKED EXAMPLES 623 Choose a convenient time of travel t, which is 10 s in this example. Obviouslytshould be small for closely ...

Solution The inner diameter of the pile is 0.508 2 0.01250.483 m. The mass of entrained water per unit length is 1030  π 4 ...

REFERENCES 625 Flow-induced Vibrations, Bowness-on-Windermere, UK, BHRA, 183–90, BHRA, Cranfield. Blevins, R.D. (1990) Flow-indu ...

Sarpkaya, T. (1976a) In-line and transverse forces on cylinders in oscillatory flow at high Reynolds numbers, Proceedings of the ...

Chapter 15 Coastal engineering 15.1 Introduction Coastal engineering encompasses a variety of problems of practical importance, ...

628 COASTAL ENGINEERING large number of periodicities in the tidal motion. The time periods of these periodic constituents are k ...

COASTAL DEFENCE 629 structures, flow-induced vibrations of structures such as piles may also occur, threatening the structural i ...

oncoming waves is small, only finer sediments are moved onshore. The sediment transported over a period of time will depend on t ...

transport of sediment along the shore. Knowledge of the sediment trans- port capacity of the longshore currents is important in ...

coastline can be expressed in terms of bands of wave heights in sectors of wave direction. It is possible to use this statistica ...

sediment motion will tend again towards equilibrium, with sediments moving along the face of the breakwater and depositing at it ...

Numerical models have to be calibrated against field data which should be of sufficient accuracy. Calibration is used to fine tu ...

COASTAL DEFENCE 635 availability and cost. The length of the groynes is related to the littoral drift; the smaller it is, the sh ...