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<p>Tropical storm Pabuk (TS-Pabuk) striked the western coast of the Gulf of Thailand (GOT) in January 2019 leaving behind prominent storm deposits onto the beach zone. This work showed results of field survey using ground penetrating radar (GPR) tracking on top of TS-Pabuk deposits. We aimed to decode GPR facies with the deposits from the pre- and TS-Pabuk along the known inundated storm flooding zone collateral with the sedimentary structure observed in excavated pits from three study sites: Prachuap Khiri Khan (PK), Chumphon (CP) and Nakhon Si Thammarat (NS). As a result, we revealed a remarkable catalog of three radar surfaces and seven radar facies (at 900&#xa0;MHz) representing the internal sedimentary structures preserved in different coastal environments. Thick black-and-white bands of sandy deposits inside TS-Pabuk at PK containing high amplitude and long wavelength with sub-horizontal stratification were dominated in a pocket beach between headlands. Landward inclined structure was prominent inside TS-Pabuk deposits in the proximal part of swale behind beach ridge at CP. Applying GPR facies catalog, we were able to differentiate storms from shore-normal beach deposits and infer the ancient washover deposits in different environments including a narrow pocket beach at PK, a swale topography at CP and at NS in shrimp ponds.</p>

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Decoding GPR facies with internal sedimentary structures of 2019 tropical storm Pabuk: utility to infer history of storm hazards in coastal environments

  • 期刊论文

  • 发表日期：

    2026年3月25日

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  • Chanakan Ketthong,
  • Sumet Phantuwongraj,
  • Thanop Thitimakorn,
  • Montri Choowong

摘要

Tropical storm Pabuk (TS-Pabuk) striked the western coast of the Gulf of Thailand (GOT) in January 2019 leaving behind prominent storm deposits onto the beach zone. This work showed results of field survey using ground penetrating radar (GPR) tracking on top of TS-Pabuk deposits. We aimed to decode GPR facies with the deposits from the pre- and TS-Pabuk along the known inundated storm flooding zone collateral with the sedimentary structure observed in excavated pits from three study sites: Prachuap Khiri Khan (PK), Chumphon (CP) and Nakhon Si Thammarat (NS). As a result, we revealed a remarkable catalog of three radar surfaces and seven radar facies (at 900 MHz) representing the internal sedimentary structures preserved in different coastal environments. Thick black-and-white bands of sandy deposits inside TS-Pabuk at PK containing high amplitude and long wavelength with sub-horizontal stratification were dominated in a pocket beach between headlands. Landward inclined structure was prominent inside TS-Pabuk deposits in the proximal part of swale behind beach ridge at CP. Applying GPR facies catalog, we were able to differentiate storms from shore-normal beach deposits and infer the ancient washover deposits in different environments including a narrow pocket beach at PK, a swale topography at CP and at NS in shrimp ponds.