PENGARUH PERGERAKAN MEANDER TERHADAP KESEIMBANGAN ALUR SUNGAI

Siti Murniningsih
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Abstract

Most of the river in Indonesia has a meander area especially located at the lower reach. Since the pattern of the community behaviour in Indonesia, people live in surrounding or along the river while the river plains 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 problem such as riverbed aggradations at the area surrounding inside of the bank then will decrease the river capacity in retaining flood while simultaneously eroding on the outer banks of meander bends. Regarding velocity distribution at the channel cross section, the minimum velocity is occurring on the inside of the meander, therefore some of the sediment loads is deposited. Related with the phenomena, protection against sedimentation and erosion along meandering river extremely needed. Previously, river adjustment within meander area are continually being made, therefore, eventually the gradient of a stream is altered to 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 described and propose the new concept of protection with low impact development (LID) approach.

印度尼西亚的大部分河流都有蜿蜒的区域,特别是在下游。由于印度尼西亚的社区行为模式,人们居住在河流周围或沿河,而河流平原和三角洲由冲积土壤组成,因此,曲流迁移通常是对河流系统自然或人为干扰的反应。城市曲流河段往往会导致河堤内围区域的河床淤积等输沙问题,从而降低河流的挡洪能力,同时对曲流河段外岸造成侵蚀。在河道横截面流速分布上,最小流速发生在曲流内侧,因此泥沙负荷部分沉积。与此相关的现象是,曲流河沿岸的防淤防蚀十分必要。以前,河流在曲流区域内不断进行调整,因此,最终河流的坡度被改变,以适应水的体积和运输泥沙负荷所需的速度。本文阐述了对曲流区沉积过程中各种现象的认识,并提出了低影响开发(LID)保护方法的新概念。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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