Quartenary Sediment Facies Distribution in Meandering River Environment: Study Case at The Kampar River, Rumbio Area and Surroundings, Riau Province

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Study area is located on the Kampar river in the district Rumbio and surrounding areas, located on the upstream side which is about 100 kilometres from the source of the sediment that Bukit Barisan mountain, Kampar river has a length of 413.5 km, the average width of 143 m and a depth average 7.7 m. This river is a river with meanders type carrying supplies suspended sediment and bed - load (mixed load) together with a low energy. This study aims to investigate the characteristics of sedimentary facies sediment quarter and deployment. The method used is a field survey to obtain core data rocks (1-3 meters) by 8 points wells, and cross sections measured(trenching) which is a layer of sediment that have been exposed (1-8 meters), then performed the sieve analysis to determine the grain size and sedimentary facies analysis and continued with sedimentary facies distribution map-making quarters in the study area. The facies sediment formed that Channel with the characteristic blocky to fining up succession have dominant deployment is the southernmost area of research with a thickness of 200 – 320 cm. Deployment sediment sand bar with characteristic coarsening up succession is in the northeast and southeast regions of study area with a thickness of 125 - 145 cm Next oblique accretion with upward fining characteristics that are in the north-eastern part of the area of research with a thickness of 40 cm. As well as having overbank sediment that contains a lot of organic material such as roots, stems, and foliage, with its spread is in the west and southwest area of research with a thickness of 100-160 cm. meandering river system leads to changes in sedimentary facies laterally intensive.