The first breakwaters in Thailand located at Cha-Um Beach, Phetburi province, Thailand were constructed by a Cement factory in 1968. There were two parallel breakwaters with 1,200 m long functioned as training jetties at a mouth of dredged canal in order to prevent siltation.
Canal is used as a waterway for vessel to transport cement product to Bangkok, capital of Thailand.
After analysis of shoreline field data , it was found that maximum deposition at upcoast area is 420 m while maximum retreated shoreline is -88 m along 2,500 m of downcoast coastline. The eroded area is sandy beach and is an attractive recreational area with resorts and small hotels with good potential to be developed in a future. Then remedial measure for recession area is studied . Numerical shoreline model was then developed with the modification for computing wave field in the downcoast of breakwater. It was calibrated with available shoreline data showing good agreement for both upcoast and downcoast area.