Analysis of ancient storm deposits along coastal areas of Andaman sea, Thailand and coastal areas of south china sea, Vietnam

Abstract

The frequency of high energy storm and tsunami events is crucial for apprehending the vulnerability of coastal communities. Identifying and dating sedimentary evidence deposited by such high energy events can assist in the planning and installation of suitable protection measurements. The Andaman Sea coast of Thailand is particularly vulnerable to such events as illustrated by the 2004 Indian Ocean Tsunami (2004 IOT) and the South China Sea coast of Vietnam has been experienced from the past severe storm event. Here, the authors study the high energy sediments. The selected area of Andaman Sea coast Thailand is Laem Son National park, while the South China Sea coast of Vietnam is located in Hoa Duan, Thua Thein Hue.

The results indicate that in Laem Son area, two high energy sediment layers are discovered including the 2004 IOT layer and a storm layer. The depositional age of the storm event occurred more than 350 years ago. For Hoa Duan coastal area, six layers of high energy events belonged to storm and fluvial flood layers were discovered. Two layers of storm event and one layer of fluvial flood event occured during 130±10 years ago and two layers of storm event and one layer of fluvial flood event occurred more than 130±10 years ago.