砂浜砕波帯における流れと地形変化
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1 47 * Currents and Morphological Changes in the Surf Zone on a Sandy Beach Yoshiaki KURIYAMA, Littoral Drift Division, Port and Airport Research Institute 1 1 1) ρd M M x y = (1) t x y 2.1 M x UM UM x y + + = t x y η U U ρgd + LD + LD (2) x x x y y 1 2 S S xx xy + + τ bx x y (1) (2) (2)x y ρ D = h + η h * kuriyama@pari.go.jp η t M x = ρdum y = ρdv UV x y L
2 48 S xx S xy radiation stressτ bx xy x y radiation stress 2,3) ) ) ) X 3.1 V P P 5)
3 49 Berm Inner bar inner bar inner bar 1m2m tombolo salient D.L.+1.4m 2m 8cm (m)
4 m/s 2m/s 14 13m ) m m 1m m 1m m 13.6m/s 1m 3m 4
5 51 3m 4.2 2cm 2.2 1m 2 1m 12 3m 18,19) Hazaki Oceanographycal Research Station, HORS 11 4m 8) (3) U FLOAT U 8) (3) U =. 81U FLOAT (3) HORS y bar y peak Renier 2) 12
6 52 13y bar y peak y peak -y bar 5cm/s 21) (2)C d ρ a W 2 sinα w C d 15 ρ a W α w.5 C d
7 53 1 N P115m P19m HORS P285m S P38m Time(year) m P115m 1 N P2m Case P2m P2m P3m P3m Case R n 18 R /( ) n = U sn U s1 + U s2 + U s3 (4) Case 3-5 R n n U sn n P115m P19m S P285m P38m Time (year) P115m 1 Case Case 1 Case 2 18 P24m Seaward Distance (m) P2m 18 Alongshore Distance(km) Alongshore Distance (km) Contribution Rate (%)
8 Case Case Case ) Breaking Wave Direction (degree) 2) ) HORS 4) Longuet-Higgins, M. S.: Longshore current generated by obliquely incident sea waves, 2, J. Geophys. Res., (197) P2m 5) Galvin, C. J. and Eagleson, P. E.: Experimental study of longshore currents on a planar beach, P2m Tech. Mem. U.S. Army Coast. Eng. Res. Cent., 1 P3m (1965) ) Thornton, E. B. and Guza, R. T.: Surf zone longshore currents and random waves: field data and models, J. Physical Oceanography, 16 (1986) P2m P3m 7) 37 (199) ) (1992) ) 31 (1984) ) 27, (1987) ) 36 Frequency
9 55 (1989) ) T.C.: Longshore currents over barred beach, Proc. Coastal Dynamics 95, (1995) ) (1982) ) Kuriyama, Y.: Investigation on cross-shore 635 (1999) sediment transport rates and flow parameters in 22) the surf zone using field data, Rep. Port and Harbour Research Institute, Vol.31, No.2, pp.3-58, 43 (1996) ) 14) ) Sonu,C.J.: Field observation of nearshore circulation and meandering currents, J. Geophys. Res., (1972) ) Reniers, A.J.H.M., Thornton, E.B. and Lippmann, 43 (1996) ) 5 (23) ) 25) (24) (1974) ) 17) 163 (1973) (24) ) 18) 4 (1993) (1996) ) Kuriyama, Y.: Hydro- and morpho-dynamics on a 28) barred beach, Technical Note of the Port and Airport Research Institute, 128 (22) (1997)
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