Sediment Deposit of Floodplain Formation Resulting From Lateral Accretion Surfaces on Tropical Area : Case Study at Kampar River, Indonesia

[ABSTRACT]Kampar Rivers with the length of 413 km with average depth of 7.7 m and wide of 143 m. 60% of river is meandering fluvial system which transport and deposit a mixture of suspended and bed-load (mixed load) along low energy. River channel that moving sideways by erosion is undergoing lateral migration and the top of the point bar becomes the edge of the floodplain and the fining-upward succession of the point bar will be capped by overbank deposits of Kampar River. Along the Kampar Rivers, there are more than 60% of floodplain sediments and almost all of the floodplain formed by bend migration on the suspended-load channels of Kampar watershed. This formation consist of succession of fine to medium sand and silt/mud, with root traces, that form as drapes on the prograding bank. These beds dip mostly channel wards and quickly wedge out as they grade up and onto the floodplain. The depositional model is presented showing how lateral accretion can make a significant contribution to the preservation of fine-grained within channel deposits in contemporary floodplains. The examples presented here demonstrate that analogues to ancient point-bar deposits containing alternating sandstone and shale sequences are common in the low-energy fluvial environments of Riau rivers especially Kampar rivers.

https://opac.ll.chiba-u.jp/da/curator/107877/

https://opac.ll.chiba-u.jp/da/curator/107877/ceresIntlSympo-24-P502.pdf

Chiba University. Center for Environmental Remote Sensing

千葉大学環境リモートセンシング研究センター

会議発表用資料

Proceedings of the CEReS international symposium = CEReS国際シンポジウム資料集

24

502

510

2016-11-21

publisher

環境リモートセンシング研究センター「CEReSシンポジウム資料集」