ลักษณะการแจกกระจายของทรายที่รั่วไหลจากถุงทรายป้องกันการกัดเซาะชายฝั่ง ด้านทิศตะวันออก ของแม่น้ำเจ้าพระยา

Abstract

The study on distribution characteristic of leaked sand from geotextile sand tube used for
protecting coastal erosion at Ban Sri Long, Song Klong sub-district, Bang Pakong district, Chachoengsao
province was conducted by sampling topsoil (0-15 cm) and subsoil (15-30 cm). The soil samples were
collected from mud flat between the geotextile sand tube along the coastal area. The sampling lines that
perpendicular to shore line from the ripped geotextile sand tube to shore line were settled into 5 lines with
5 meters line interval. The 10 sampling points in each sampling lines with 20 meters sampling interval were
settled. The soil samples were analyzed soil texture, sand particle size distribution and evaluated direction
movement of sand particles. The results of the study showed that the soil texture near the ripped
geotextile sand tube and at the shore line were sand particles which were more than 20%. The soil texture
in the topsoil (0-15 cm) near the ripped geotextile sand tube were sand particles 25.76-33.15%, while sand
particle at the shore line was 38.78-45.60%. The sand particle was normally accumulated at the shore line

latter than distributed over all mud flat. The 67.64-77.24% of sand on topsoil were coarse sand
(1.00-2.00 mm), while 41.33%-63.17% on subsoil was fine sand (0.50 – 1.00 mm). The movement direction
of sand particle to the shore area is nearly the Northeast direction or deviates 30 degree from the
perpendicular to shore line as the movement direction of waves and shore tide.