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Muhammad Scyroth Arianto
Universitas Muhammadiyah Makassar
Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Energy Engineering

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Downstream Amplification of Suspended-sediment Flux Outpaces Discharge Growth in the Mangottong River, Indonesia Muhammad Scyroth Arianto; Ilfan Muis; Andi Makbul Syamsuri; Fithriyah Arief Wangsa
Journal of Green Complex Engineering Vol. 4 No. 1 (2026): August
Publisher : Gio Architect

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59810/greenplexresearch.v4i1.286

Abstract

Suspended-sediment transport in small tropical rivers can change sharply over short distances because discharge, sediment availability, and cross-sectional mixing vary simultaneously. This study examined longitudinal changes in water discharge, suspended-sediment concentration (SSC), and instantaneous suspended-sediment flux along the Mangottong River, South Sulawesi, Indonesia. Five observations were available at each upstream, midstream, and downstream cross-section. Point discharges were verified from the field calculations, SSC was derived from laboratory dry-mass measurements, and section concentration was evaluated using discharge weighting. Suspended load was calculated as 0.0864CQ, with C in mg L⁻¹ and Q in m³ s⁻¹. Section discharge increased from 5.178 to 7.554 and 8.438 m³ s⁻¹, whereas discharge-weighted SSC changed from 626.5 to 568.3 and 1,829.2 mg L⁻¹. Corresponding suspended loads were 280.3, 370.9, and 1,333.5 t d⁻¹. The downstream section therefore carried 4.76 times the upstream load while water discharge increased only 1.63-fold. The lower-reach amplification was driven primarily by sediment enrichment rather than discharge growth alone, demonstrating the value of discharge-weighted sampling for interpreting sparse river surveys.
Co-Authors Andi Makbul Syamsuri Fithriyah Arief Wangsa Ilfan Muis