Analisis Angkutan Sedimen Pada Sungai Noelmina

JEMPARU, Renaldis Rosalia (2025) Analisis Angkutan Sedimen Pada Sungai Noelmina. Undergraduate thesis, Universitas Katolik Widiya Mandira Kupang.

	Text ABSTRAK.pdf Download (505kB)
	Text ABSTRAK.pdf Download (505kB)
	Text BAB I.pdf Download (247kB)
	Text BAB II.pdf Restricted to Repository staff only Download (669kB)
	Text BAB III.pdf Restricted to Repository staff only Download (339kB)
	Text BAB IV.pdf Restricted to Repository staff only Download (1MB)
	Text BAB V.pdf Download (199kB)
	Text DAFTAR PUSTAKA.pdf Download (918kB)

Abstract

The Noelmina River is one of the main rivers in East Nusa Tenggara, playing a vital role in the lives of local communities as a source of irrigation water, domestic needs, and aquatic ecosystems. However, erosion, sedimentation, and land-use changes in the watershed have the potential to affect flow characteristics and sediment transport. This study aims to analyze the characteristics of sediment transport and determine the amount of bed load in the Noelmina River, thereby providing an overview of sediment dynamics and supporting sustainable river management. The research method includes field data collection, data processing, and result analysis. Field data were obtained through measurements of flow velocity, discharge, riverbed slope, and sediment sampling at three observation points (upstream, middle, downstream). Sediment samples were analyzed in the laboratory to determine the dominant grain-size distribution, shear velocity, and coefficient of uniformity (CU). Data processing employed the Meyer-Peter Müller (MPM) method and the Einstein method to calculate the bed load. A research flow diagram was prepared to guide the analysis from data collection to conclusion. The results indicate that the transported sediments are dominated by sand fractions, ranging from very fine sand to very coarse gravel. CU values at the upstream (2.054), middle (2.436), and downstream (1.86) sites vary, with the average indicating a heterogeneous sediment category. Bed load calculations show significant variation among upstream, middle, and downstream segments, with the largest annual volume found downstream. The shear velocity (U*) and critical shear velocity (Ucr) at each location were: U = 0.928 m/s (shear velocity), D35 = 2.103 mm; Ucr = 0.047 m/s, D55 = 3.650 mm; Ucr = 0.070 m/s, D65 = 5.054 mm; U*cr = 0.048 m/s. Based on these values, the sediments in the Noelmina River are classified as mobile particles. Overall, the Einstein method yielded a higher result (102.59 m³/day) compared to the MPM method (73.14 m³/day). In this study, the Einstein method tended to produce higher sediment transport values because it considers detailed grain-size distribution, turbulence effects, and a shear velocity parameter more sensitive to flow variations. For the heterogeneous sediments of the Noelmina River (high CU), the probabilistic approach of the Einstein method accounts for more particles being transported compared to the MPM method, which uses a more conservative empirical formula better suited for uniform sediments.

Actions (login required)

View Item