Coastal Line Change Analysis of Samila Beach, Songkhla Province, (2025) using Geoinformatics Technology

Abstract

A study on the changes in the coastal conditions of Samila Beach, Songkhla Province. The study area starts from the Golden Mermaid statue to the breakwater at the mouth of the Songkhla Lake channel, covering a distance of 2,720 meters. The objective was to study the change in the coastal area and to prepare a map showing the coastline changes in the Samila Beach area, Songkhla Province. The coastline position was recorded using a Geographic Positioning System, with the time of the highest tide taken from the tide tables. Data was recorded 2 a month, every month, continuously for one year in 2025 A.D. The data was then analyzed to calculate the area of Samila Beach using the Quantum GIS 3.4.12 It was found that the coastal area of Samila Beach is continuously undergoing depositional change at a rate of 3,612.09 square meters per month, or 43,345.08 square meters per year. The average beach area throughout the year in 2025 A.D. will be equal to 1,150,039.85 square meters. When compared to the Samila beach area from data collected in 2018 A.D., which had an average beach area throughout the year of 1,092,286.62 square meters, it shows that over a period of 8 years, the coastal area of Samila Beach has increased due to deposition by 57,753.23 square meters, or an increase of 7,219.15 square meters per year. The coastline is experiencing sedimentation at a rate of 2.65 meters per year. The map indicates that deposition occurred more significantly in the upper and middle sections of the coast than in the lower section.