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Download fileSediment consolidation in ephemeral river: the effect of applied loading on soil properties and dredging method selection
journal contribution
posted on 2020-04-24, 13:33 authored by RAA Soemitro, F Adriati, DD Warnana, T Mukunoki, Robby SoetantoRobby Soetanto, MA MaulanaBengawan 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 ManagementVolume
19Issue
3Pages
297-306Publisher
Taylor and FrancisVersion
- VoR (Version of Record)
Rights holder
© The authorsPublisher 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
2020-03-10Publication date
2020-04-22Copyright date
2020ISSN
1571-5124eISSN
1814-2060Publisher version
Language
- en