SEDIMENT FLOW CHARACTERISTICS ON SEABED SUBJECTED TO STATIONARY WAVES WITH DIAGONAL INCIDENT WAVE LOADING NEAR LINE STRUCTURES

Form 12 groups times flume experiment of No-plant and plant height of 2,5,9cm simulation, the order of effect that sediment flow characteristics with vegetation growth was investigated. The results show that the vertical velocity distribution of sediment flow with plant is no longer consistent with logarithm distribution with no plants in sediment flow, but for the "S"-type distribution. The Re increases with the decrease of plant height and the increase of flow. The roughness decreases with the increase of plant height and flow.

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Sediment Flow Characteristics in The Upper Slope of Volcanic Landscapes With Dryland Agriculture

Geosfera Indonesia ◽

10.19184/geosi.v6i3.24480 ◽

2021 ◽

Vol 6 (3) ◽

pp. 241

Author(s):

La Ode Hadini ◽

Junun Sartohadi ◽

M. Anggri Setiawan ◽

Djati Mardiatno ◽

Nugroho Christanto

Keyword(s):

Water Level ◽

Soil Loss ◽

Average Rate ◽

Discharge Rate ◽

Measurement Data ◽

Flow Characteristics ◽

Suspended Sediments ◽

Dryland Agriculture ◽

Creative Commons ◽

Sediment Flow

Increasing population densities and food demands are major factors contributing to the widespread use of agricultural drylands in upper volcanic slope areas. This phenomenon poses a high risk of severe erosional events that are environmentally hazardous. Therefore, this study aims to analyze the sediment flow characteristics, based on the relationship between sediment flow and water level as well as the sediment discharge rate and soil loss. Field surveys were conducted to determine the soil measurement, slope morphology and dryland cover characteristics. The sediment flow was evaluated at the gully outlet, where 169 suspension data pairs for the modeling and 130 suspension data pairs for the validation, as well as the bed load, water level, rainfall and water flow characteristics were obtained. Tables and figures were subsequently used to represent the measurement data and analysis results for the correlation between the flow rate effects, sediment and soil loss on the water surface. The results showed that the sediment flow in volcanic landscape slopes with dryland agriculture were possibly characterized by the polynomial relationship, using the suspension discharge model, Qs=0.0322Q2+6.0625Q–1.2658. Under this condition, the average rate of soil loss in the form of sediment load and erosion rate of the catchment area occurred at 953.53 and 1,657.94 ton/ha/yr, respectively. Furthermore, the sediment sources in the soil loss were believed to originate from 83% of the suspended sediments and 17% bed loads. Keywords: Discharge; Dryland; Landscape; Sediment; Volcano Copyright (c) 2021 Geosfera Indonesia and Department of Geography Education, University of Jember This work is licensed under a Creative Commons Attribution-Share A like 4.0 International License

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The Simplified of Suspended Sediment Measurement Method in Natural River (Case study of Kuning River in Yogyakarta, Indonesia)

Journal of the Civil Engineering Forum ◽

10.22146/jcef.47061 ◽

2019 ◽

Vol 5 (3) ◽

pp. 243

Author(s):

Bambang Yulistiyanto ◽

Bambang Kironoto ◽

Bangun Giarto ◽

Mariatul Kiptiah ◽

Muhammad Lutfi Tantowi

Keyword(s):

Suspended Sediment ◽

Cross Sections ◽

Suspended Sediment Concentration ◽

Flow Characteristics ◽

Preventive Measure ◽

Suspended Sediments ◽

Sediment Concentration ◽

Middle Part ◽

Sediment Discharge ◽

Sediment Flow

The accumulation of suspended sediment reduces the capacity in the river and deteriorates the water quality. Kuning River in Yogyakarta is one of the main rivers in Yogyakarta, Indonesia, which is currently facing the issue of suspended sediments. To reduce the effect of suspended sediment and determine a preventive measure, hence, it is necessary to study the characteristics of the suspended sediment flow. Therefore, this study aims to investigate the suspended sediment flow characteristics, i.e. the velocity, and the concentration profiles at specific points in the transverse direction of the channel as well as the correlation of the suspended sediment discharge. Thirty (30) profiles of velocity and suspended sediment concentration were measured at six different points along the Kuning River. Opcon probe was used to measure suspended sediment concentration, while the propeller current meter was used to measure mean point-velocity profiles. Results of this study show the suspended sediment discharge ratio, defined as are higher in the middle part of the channel than the one near the edge of the channel. The position of z/B where the values of 1 occurs at z/B = 0,19 and z/B = 0,75, which depend on the irregularity of the channel cross-sections. For practical purposes, the depth-averaged velocity and suspended sediment concentration can be determined from 1, 2 and/or 3 points measurement at y = 0,2D, 0,4D and 0,8D.

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