Abstract:
Based on the hydrodynamic model and Shore Protection Manual (CERC - USA) we have
calculated wave field characteristics in the typical wind conditions (wind velocity equal to
13m/s in the high frequency direction of the wind regime). Comparison between measured
and calculated wave parameters was presented and these results were corresponded to each
other. The following main wave characteristics were calculated:
-Pattern of the refraction wave field.
-Average wave height field.
-Longshore current velocity field in surf zone.
From distribution features of wave field characteristics in research areas, it could be
summarized as following:
- The formation of wave fields in the research areas was unequal because of their local
difference of hydrometeorological conditions, river discharge, bottom relief…
- At Cuadai (Dai mouth, Hoian) area in the N direction of incident wave field, wave has
caused serious variation of the coastline. The coastline in the whole region, especially, at
the south of the mouth was eroded and the foreland in the north of the mouth was deposited.
- At Cai river mouth (Nhatrang) area in the E direction of incident wave field, wave has
effected strongly and directly to the inshore and channel structure.
- At Phanthiet bay area in the SW direction of incident wave field, wave has effected
strongly to the whole shoreline from Da point to Ne point and caused serious erosion.
