Tidal Waves Essay

2.4.5 Tide

Along with the waves, tides are other major types of phenomena that control the interactions between sea and coast. The tides are best known as the rise and fall of the sea around the edges of the land. The rise and fall of the tides may result in small scale and short term topographical changes on the beach. Hill (2004) found that small-scale beach erosion occurs when the tide rises while accretion occurs when it falls. In some coastal areas there is a regular pattern of one high tide and one low tide each day; this is a diurnal tide. In other areas there is a cyclic high water – low water sequence that is repeated twice in one day; this is a semidiurnal tide (Duxbury et al., 2002). However, a mixed tide happened when the high tides

Masselink and Turner (1999) provided a review of the work on tidal effects on beach morphodynamics. These oscillations have a periodic impact on surf-zone and beach processes. The influences of non-tidal surge could result insignificant differences in beach characteristics between the active lower foreshore and the less frequently impacted of upper foreshore (Jackson et al., 2002). Long-term fluctuations in water level can cause net shoreline retreat or progradation (Komar,

Coastal current generally flow parallel to the coastline (Mohd-Nasir and Meged, 1996). The current flows to southward during the northeast and to northward during the southwest monsoons respectively (Mohd-Nasir and Camerlengo, 1997). Generally, during the Southwest Monsoon (Figure 2.8a), water moves in a clockwise circulation over the sea. On the east coast of Pahang, water moves towards the north and then deflect to the right on the northern part of the