1. Tsunami-Tide Interactions Zygmunt Kowalik, University of Alaska Fairbanks Andrey Proshutinsky, Woods Hole Oceanographic Institution

2. Cook Inlet region Depth: ~20m Length: ~350km Anchorage Anchor Point

3. Cook Inlet tsunami

4. Blue – tide and tsunami Red – tide only

5. Blue – tide and tsunami Red – tide only

6. Blue – tide and tsunami Red – tide only

7. Blue – tide and tsunami Red – tide only

8. Blue – tide and tsunami Red – tide only

9. Blue – tide and tsunami Red – tide only

10. Blue – tide and tsunami Red – tide only

11. Blue – tide and tsunami Red – tide only

12. Blue – tide and tsunami Red – tide only

13. Blue – tide and tsunami Red – tide only

14. Blue – tide and tsunami Red – tide only

15. Blue – tide and tsunami Red – tide only

16. Blue – tide and tsunami Red – tide only

17. Blue – tide and tsunami Red – tide only

18. Blue – tide and tsunami Red – tide only

19. Blue – tide and tsunami Red – tide only

20. Blue – tide and tsunami Red – tide only

21. Blue – tide and tsunami Red – tide only

22. Blue – tide and tsunami Red – tide only

23. Port Valdez Relatively deep basin: (~100-150m) Total length: ~130 km Open boundary: SSH growth during 15 minutes from 0 to 200 cm

24. Tide-tsunami interaction (a river mouth in Port Valdez) 1. Tsunami signal arriving time without tide: 20 minutes and 50 minutes at high tide because of total depth increase and, respectively, increase of tsunami wave propagation speed. Water depth=1m Arriving times: 30 and 50 minutes Land elevation=1m Arriving times: 30 and 50 minutes 2. Without tide sea level increases sharply and the first maximum is ~400 cm. With tide sea level grows gradually and the first maximum is ~310cm. The third maximum is the greatest one (~470cm) and is higher for the case without tide by 15 cm only. 2. Tsunami amplification for 3 maximums (first, second and third, respectively: a)Without tide = 2.00 2.20 2.35 b)With tide = 1.55 1.95 2.25