Amirul, MukmininRifardiEdwar, Rufli2014-11-092014-11-092014-11-09Dodyhttp://repository.unri.ac.id/xmlui/handle/123456789/6517The purpose of this study is to claiify relationship between sedimentation process including accumulation rate total suspended solid and grain size-sediment, and anthropogenic activities. Sediment samples consist of accumulation rate, total suspended solid and surface sediments were collected from 4 stasions in the dompak sea, Riau Archipelago province, Indonesia in July to August 2008. Present work revealed that station 4 is characterized by the bigbest accumulation rate (2.21 ml /cm2/ day ), very fine sand and very poorly sorted sediment, under the influence of bauxite mining supplied terrigeneous sediments. Contrastingly, station 3 is occupied by the lowest accumulation rate accumulation rate (0.48 ml/cm2/day), high suspended sediment (2 mg/l) , and coarse silt, under the influence of rather stagnant water masses. Rather high accumulation rate (0.72 ml/ cm2/day),coarse silt and well sorted sediments are found in station 1 which affected by waters transportation and binterland development activities. The sediment of station 2 is characterized by accumulation rate (0.55 ml/cm2 / day), fine sand and moderately well sorted sediment. The sediment is assumed to be derived from surrounding areas which is trapped by mangrove . the result at the probability calculation sedimentation occurring in Dompak Sea is affedted by anthropogenic activities (p<0.05) in addition, natural process play also importance role on the sedimentation. Keywords : sedimentation, anthropogenic activities, natural process, Dompak SeaSedimenDompakUR-Scientific Work Lecturer