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Aceepted in Oral Presentation on Session G6: Soil Geohazard and Geoenvironment in Lowland --. Invited Lecture GE47 Chair: Dr. D. Suetsugu Co-Chair: Dr. S. Manandar (Building 6, 1F, Room No. 101) COASTAL EROSION IN TAKALAR BEACH SOUTHERN MAKASSAR, INDONESIA R.Langkoke1, B. Rochmanto1, J.R.Husain2 and M. Akbar3 ABSTRACT: One methods to identify the coastal erosion is carried out by identification of characteristic grain size sediment. Geologists and sedimentologists use information on sediment grain size to study trends in surface processes related to the dynamic conditions of transportation and deposition; while engineers use grain size distribution to understand the physical properties of sediment such as permeability and stability sediment under load. A statistical description that adequately characterizes the sample sediment from the study area used Gradistat (Blott and Pye, 2001) and Grandplot. The characteristic grain size distribution at Popo beach during the end of rainy season were dominated by medium sand (83, 33%), moderately well sorted (50%), moderately sorted (33,33%) the skewness are symmetrical (58,33%), and coarse skewed (25%) the kurtosis are mesokurtic (41,67%), very leptocurtic (25%), leptokurtic (25%). The dominantly negatively skewed related process dynamic transportation along a beach were high energy, high wave, generate a long shore current and indication coastal erosion and non-depositional influence wining. The cumulative curve Gaussian all samples of the study area show grain size depositional type tidal segment with subsurface creep population, and sediment were deposited by wind, and formed eolian process segment. Fluvial sediment which was supplied by river, was eroded by coastal hydrodynamic along the coastal area. |