《河海大学海岸动力学Homework(8).doc》由会员分享，可在线阅读，更多相关《河海大学海岸动力学Homework(8).doc（1页珍藏版）》请在三一文库上搜索。
1、Homework (8)港一 黄鹏飞 241. A deep-water wave of period 8.5 s and height 5 m is approaching the shoreline normally. Assuming the seabed contours are parallel, estimate the wave set-down at the breakpoint and the wave set-up at the shoreline. ( b 0.78 )H bH0'(HgT 2L02wave setwave set0.563,the wave is
2、 approaching the shoreline normally: H 00' / L0)1/5H b6.728m112.75m, H b 5.248m, hbbdown at the breakpoint :H b1b0.2624 m, K201 8/(3up at the shoreline :bKhb0.988m5mH 0',2b )0.1862. A wave train propagates toward a beach with slope 1/30. The wave height in deep water is 2 m, the wave period
3、is 8 s and the breaker angle is 15 o. Find the mean velocity( 平均速度 ) of the long shore currentwithin breaker zone. (K s1.0, f w0.009,b 0.725.6 tan)tan1/ 30,H02m,TgT 299.87m,b 158s, L025(1 K ) tanvlumb sin0 ,0b41.65 ,b 0.72 5.6tan0.90716 fw0.25H 05.5L0K10.236,krcos0'kH 0 1.759m18/ (3 2b )cos0.88,H 0b破波点处波高 H b0.76(tan)1/7 ( H0'/ L0) 1/4 H0'2.257hbH b2.488m,umb0.5 bg (h)bumb0.5 b g (hb) 0.5 0.9079.8 (2.488 0.05 2.257) 2.188m / svl1.574m / s1