sediment consolidation in ephemeral river - the effect of applied loading on soil properties and dredging method selection.pdf (2.12 MB)

Sediment consolidation in ephemeral river: the effect of applied loading on soil properties and dredging method selection

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journal contribution
posted on 24.04.2020, 13:33 by RAA Soemitro, F Adriati, DD Warnana, T Mukunoki, Robby Soetanto, MA Maulana
Bengawan Solo River, a typical large ephemeral river in Indonesia, is facing stream problems induced by the erosion and deposition of sediment. Imbalance between these two phenomena on the riverbed can lead to excessive sedimentation, increased risk of flooding, and formation of sandbars. One proposed solution to address this problem is dredging. However, this process can have potential negative effects on the environment, such as removal or destruction of the biota in the dredged materials, increased turbidity, as well as coverage of the benthos in the vicinity. Also, different dredging methods are needed to suit sediments with different properties. Therefore, the knowledge of the deposited sediment properties is required so that appropriate methods can be selected. The sediment characteristics were obtained by performing laboratory tests on physical and consolidation properties and shear strength tests of a soil sample. The results indicate that the materials were broadly grouped into sandy sediment in downstream areas and clayey sediment in estuary areas. The distribution of sediment properties varies with depth because of subsequent erosion and deposition over time. Additionally, the distribution also shows that sand content decreases as the origin of sample approaches estuary areas. Erosion is predominant at locations with small hydraulic radius and high flow velocity, mostly at downstream areas, whereas deposition is predominant at locations with a large hydraulic radius and low flow velocity, specifically at estuary areas. The shear strength increases as the loads imposed by the self-weight of sediment layer increase. The analysis suggests that sediments cannot be eroded naturally as they have a shear strength that exceeds the small-capacity dredging method (t . 20 kPa); therefore, the removal of excess sediment in such areas requires dredging methods of larger capacities (such as grab dredger).

Funding

Directorate General of Higher Education Indonesia-DIKTI under the International Research Collaboration Grant 2014 and 2015 managed by Institut Teknologi Sepuluh Nopember. USAID-NSF under Grant PEER (Partnerships for Engagement in Research) Science cycle 3 2014

Grant BeasiswaUnggulan 2014–2016

Japan Student Service Organization under Grant JASSO Short-Term Exchange Program 2015–2016; KLN - Dikti

History

School

  • Architecture, Building and Civil Engineering

Published in

International Journal of River Basin Management

Pages

1 - 10

Publisher

Taylor and Francis

Version

VoR (Version of Record)

Rights holder

© The authors

Publisher statement

This is an Open Access Article. It is published by Taylor and Francis under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

10/03/2020

Publication date

2020-04-22

ISSN

1571-5124

eISSN

1814-2060

Language

en

Depositor

Dr Robby Soetanto . Deposit date: 22 April 2020