Investigation of sand resources by high resolution seismic reflection in Jomtein beach offshore area of Changwat Chonburi, Thailand

Abstract

Jomtien beach has been facing with seriously coastal erosion nowadays. There are many solving erosion’s problems in the past, but there is no right ways to succeed. The best and fastest restoration that least affects to the environment is Beach Nourishments. In each of nourishing sand, it has to use a huge of sand must usually be filled like a cycle and spent high prices with sand pit or estuary sand. It is necessary to survey deposited sediment layers in the sea. For this sand resources survey, the technic has been used by high resolution Seismic Survey, it is of Jomtien beach offshore at Eastern, Thailand. Area covers 72 km2. The result of this survey is cross section of deposited sediment. Then the result has interpreted with 6 boreholes of data logger in studied area. From seismic data with data logger, it can separate 4 Unit; A – D. Unit A, thick sediment is about 3 m. that separate in the middle of studied area, and switch shortly with Unit B. Quantity of primary evaluation is about 1.5 m3. Unit B, thick sediment on the top is about 9 m. Some area has been separated with Unit A shortly. There is evaluated primarily about 62.5 million m3. Unit C, the characteristic is ancient channel. The width is around 400 m. The deepest is around 12 m. Quantity from primary evaluation is 20 million m3. Unit D, it is on the lowest and thickest. The thickness is about 22 m. The primary evaluation is 158 million m3. In the conclusion, the quantity of sand resources offshore Jomtien beach is from the seismic survey and interpretation with data logging. It is evaluated primarily potential sediment resources in studied area about 242 million m3.