PENGARUH PERGERAKAN MEANDER TERHADAP KESEIMBANGAN ALUR SUNGAI

Abstract

Most of the river in Indonesia has a meander area especially located at the lower reach. Since the pattern of\xa0 the community behaviour in Indonesia, people live in surrounding or along the river while the river plains\xa0 and delta consist of alluvial soils, thus, meander migration usually occurs as a response to natural or manmade disturbances of the fluvial system. Meander River in urban area usually encourage sediment transport\xa0 problem such as riverbed aggradations at the area surrounding inside of the bank then will decrease the\xa0 river capacity in retaining flood while simultaneously eroding on the outer banks of meander bends.\xa0 Regarding velocity distribution at the channel cross section, the minimum velocity is occurring on the inside\xa0 of the meander, therefore some of the sediment loads is deposited. Related with the phenomena, protection\xa0 against sedimentation and erosion along meandering river extremely needed. Previously, river adjustment\xa0 within meander area are continually being made, therefore, eventually the gradient of a stream is altered to\xa0 accommodate the volume of water and the velocity necessary to transport the sediment load. In this paper, understanding of various phenomenon’s in the meander area due to the sedimentation processes are\xa0 described and propose the new concept of protection with low impact development (LID) approach.