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Wave regime within the water area with two barrier walls ⇐ ПредыдущаяСтр 4 из 4
In this case each barrier wall protection area shall be defined. The protective area of the first barrier is limited by its size, water side from В1 point up to Вгл point, main beam from Вгл point up to В point and wave diffraction border from В point up to the first barrier top. The protective area of the second barrier is limited by its size, water side from В2 point up to Вгл point, main beam from Вгл point up to В point and wave diffraction border from В point up to the second barrier top. Point B is located at the crossing of diffraction borders. Diffraction borders shall be defined as for single barrier walls. The main beam shall be constructed via points using coordinate х, standing over from wave shade border (WSB) of the barrier with less angle , deg., and coordinate х as per formula [1]:
where х - distance from the main beam up to wave shade border for barrier with less angle , m; l1 - distance from WSB to WSB of the first barrier up to crossing of wave front passing via х, subject to the first barrier diffraction border, m; la1 and la2 - coefficients in compliance with diagram on Figure 3.4; в - width of port enter assumed as a distance between barriers against initial wave, m; l2 - distance from WSB to WSB of the second barrier up to crossing of wave front passing via х, subject to the second barrier diffraction border, m.
Figure 6 Diagram of main beam development
Figure 7 Diagram for identification of l and l0 values. Figure 8 Diagram for identification of convergence index Diffraction coefficient for i-th point shall be defined as follows: 1. Across i point using compasses placing on barrier top (i.e. from the first barrier top, as i point is located within the corresponding protection area), line shall be constructed as a wave front. Wave front shall be constructed up to the crossing with WSB of corresponding barrier from which the wave front is constructed. From crossing point of WSB and wave front the perpendicular line shall be constructed up to the main beam. xi point shall be defined on the crossing of main beam and perpendicular line. 2. Foe xi point the value dc shall be defined as follows [1]:
where l1 - distance measured on perpendicular line and WSB, stood over from WSB and wave front crossing point across i point, m; l2 - distance according to perpendicular line up to WSB2 with wave front across i point, m; b - port entrance width, m. Table 19. Values of
3. For xi point the diffraction coefficient kd,.ср shall be defined as for single barrier. 4. Assuming di and kd,ср, values defined for xi point, the coefficient shall be defined. 5. Diffraction coefficient for i-th point shall be defined as follows:
where diffraction index at i-th point of water area with barriers; - diffraction index at i-th point of water area assumed for a single barrier with i-th point; - convergence index.
Table 12. Assessment of the protection of the water area
Conclusion
Literature
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