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Promngam, Atsanupong (King Mongkut's Institute of Technology Ladkrabang) | Charusrojthanadech, Nunthawath (King Mongkut's Institute of Technology Ladkrabang) | Maleesee, Komsan (King Mongkut's Institute of Technology Ladkrabang) | Yamamoto, Yoshimichi (Tokai University)
ABSTRACT The research on the effect of coastal facilities for protecting an estuary from channel blockage and a coast from beach erosion by waves demands to understand wave propagation, a nearshore current and sediment transportation. The purpose of this research is to evaluate the effect of jetties to the Chumphon estuary coast in Chumphon province, Thailand, and propose measures for erosion protecting in this coast. The long term prediction by a one-line model indicates the heavy erosion of around 1000 m northward from the jetties, the erosion around 250 m and 650 m southward from the jetties. As for the erosion of around 250 m southward, measures were examined in the last inter-national conference of ISOPE. As for the erosion of around 650 m southward, since there is no property which should be protected, it is ignored here. Therefore, about the heavy erosion of around 1000 m northward, measures are examined. In this study, since almost of all sand must be transported to jetties, sand nourishment is not a good measure. Detached breakwaters, artificial reefs, and non-measures are examined with the costs on the construction or the compensation, and the prevention effect of wave overtopping, short term erosion, and deterioration of a view. It makes clear that the most effective measure is non-measures (in other words, it is "set back"). INTRODUCTION At present, the coast of Thailand suffers from severe coastal erosion, resulting in loss of property of the people and the government spoil the scenery which affect to the tourism business and also causes damage to coastal resources. Coastal erosion in many areas is likely to be more frequent and intensify. Therefore, it is necessary to have plan for prevent and resolve the problem properly. Chumphon estuary is a fishing port and a major economic center of the province. There are many fishing boats of thefishery communities and this is one of the most important fishing area of the country and also a good place for the commercial of sea food products in Chumphon province, there are beautiful sandy beaches where are suitable for tourism and relaxation. There are also boat trips to islandsand ocean to see the beauty of nature on land and under the sea.
Promngam, Atsanupong (King Mongkut's Institute of Technology) | Charusrojthanadech, Nunthawath (King Mongkut's Institute of Technology Ladkrabang) | Maleesee, Komsan (King Mongkut's Institute of Technology Ladkrabang) | Yamamoto, Yoshimichi (Tokai University)
ABSTRACT The research on the effect of coastal facilities for protecting an estuary from channel blockage and a coast from beach erosion by waves demands to understand wave propagation, nearshore current and sediment transportation. The purpose of this research is to study the effect of jetty and propose countermeasures to compensate insufficient safety in Chumphon estuary, Chumpon province. The field survey is executed, topographic maps, bathymetric data, wave data for storm surges, tidal data were collected and inputted in Ca's numerical model (Ca et. al., 2000). This model consists of the near shore fluid dynamic model based on the Boussinesq equation and the topographical change model which the bed load and the suspended load were considered. Although the jetties are very effective for channel maintenance, since diffraction waves by the jetties has drawn sand in the north-side beach of the jetties toward the jetties, serious coastal erosion has occurred in the center of this north-side beach. Moreover, according to the simulation results by using Ca's model, in the south-side beach of the jetties, if a typhoon of Linda classes hits this area, since heavy overtopping occurs, wave dissipation facilities are necessary. INTRODUCTION Many estuaries in Thailand have affected by the waves that result in the deposition of sediment increasing and closing maritime routes where are the connection between the river and the sea and making navigation problem. The local government has to find the way to prevent such problems and has to conduct dredging annually to maintain the depth and width properly so that the ship can normally access. A lot of budget are lost in dredging each year. Therefore, the jetties have been constructed to protect the wave and sediment deposition into the estuary and to maintain the depth and width of the channel and help the fishermen around the estuary can take their boats to catch fishes as usual.