법성포 연안의 퇴적환경과 퇴적률

Abstract

Considering the change of depositional environments in inter and littoral zones of the Beopseongpo area, surface sediments and accumulation rates were investigated during Dec. of 2007 to Oct. of 2009 in the areas. The intertidal zones are composed of (g)M, sZ, mZ, Z and M in facies, mostly bearing silt and clay. The sediments in the zones are 4.72 to 7.58∅ in mean grain size, 1.43 to 3.47∅ in sorting, and 0.12 to 0.66 in skewness, respectively. In the subtidal zones, the sediments are gmS, (g)mS, (g)S, (g)M, S, zS, zC, sZ and Z in facies with high contents of sand and silt. And the sediments are -0.08 to 6.11∅ in mean grain size, 0.50 to 3.81∅ in sorting, -0.14 to 0.89 in skewness, respectively. According to the modal analyses of above zones, inter and littoral zones are unimodal and bimodal in each. The bimodal mode might be inferred as the results of abrupt environmental changes or reworking. The accumulation rates in the areas indicate the predominating accumulation areas of -6.36 to 20.81㎜/yr (8.91㎜/yr in avg.) rates. The phenomena are inferred as the influences of the influx of Watan stream, tides, several currents, climatic conditions and surrounding topographies.