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JDR Vol.12 No.3 pp. 617-630
(2017)
doi: 10.20965/jdr.2017.p0617

Paper:

Assessment of Sedimentation in Wlingi and Lodoyo Reservoirs: A Secondary Disaster Following the 2014 Eruption of Mt. Kelud, Indonesia

Fahmi Hidayat*1,*2,†, Pitojo T. Juwono*3, Agus Suharyanto*2, Alwafi Pujiraharjo*2, Djoko Legono*4, Dian Sisinggih*3, David Neil*5, Masaharu Fujita*6, and Tetsuya Sumi*7

*1Research and Development Bureau, Jasa Tirta I Public Corporation
Jl. Surabaya 2A, Malang, Indonesia

Corresponding author

*2Civil Engineering Department, Brawijaya University, Malang, Indonesia

*3Water Resources Engineering Department, Brawijaya University, Malang, Indonesia

*4Civil and Environmental Engineering Department, Gadjah Mada University, Yogyakarta, Indonesia

*5Centre for Advanced Research on Global Change, Hanoi University of Natural Resources and Environment (HUNRE), Hanoi, Viet Nam

*6Sedimentation Disasters Laboratory, Research Center for Fluvial and Coastal Disasters, Disaster Prevention Research Institute, Kyoto University,
Kyoto, Japan

*7Water Resources Research Center, Socio and Eco Environment Risk Management, Disaster Prevention Research Institute, Kyoto University, Kyoto, Japan

Received:
December 1, 2016
Accepted:
March 22, 2017
Online released:
May 29, 2017
Published:
June 1, 2017
Keywords:
reservoir sedimentation, volcanic eruption, secondary disaster, Mt. Kelud
Abstract

Wlingi and Lodoyo reservoirs in the Brantas River basin, Indonesia, provide numerous benefits including reliable irrigation water supply, flood control, power generation, fisheries and recreation. The function of both reservoirs particularly in relation to flood control has declined due to severe sedimentation that has reduced their storage capacities. The sedimentation in Wlingi and Lodoyo reservoirs is mainly caused by sediment inflow from the areas most affected by ejecta from eruptions of Mt. Kelud, one of the most active volcanoes in Indonesia. The main objective of this research is to assess the sedimentation problem in Wlingi and Lodoyo reservoirs, particularly as they are affected by eruptions of Mt Kelud. We performed reservoir bathymetric surveys and field surveys after the most recent eruption of Mt. Kelud in February 2014 and compared the results with surveys undertaken before the eruption. The assessment revealed that both reservoirs were severely affected by the 2014 eruption. The effective storage capacity of Wlingi reservoir in March 2013 was 2.01 Mm3 and the survey in May 2015 indicated that the effective storage of Wlingi reservoir had decreased to 1.01 Mm3. Similarly, the effective storage capacity of Lodoyo reservoir in March 2013 was 2.72 Mm3, reduced to 1.33 Mm3 in May 2015. These findings underpin the analysis of the impacts of the secondary disaster due to reservoir sedimentation following the volcanic eruption and the implications for mitigating and managing the risks for sustainable use of reservoirs to control floods, supply water, generate electricity, etc. To cope with the extreme sedimentation problem in Wlingi and Lodoyo reservoirs, diverse sediment management strategies have been applied in these reservoirs and their catchments. However sediment disaster management strategies for both reservoirs, an integral part of the Mt. Kelud Volcanic Disaster Mitigation Plan, require continuous maintenance and recurrent operations, and ongoing evaluation and improvement.

Cite this article as:
F. Hidayat, P. Juwono, A. Suharyanto, A. Pujiraharjo, D. Legono, D. Sisinggih, D. Neil, M. Fujita, and T. Sumi, “Assessment of Sedimentation in Wlingi and Lodoyo Reservoirs: A Secondary Disaster Following the 2014 Eruption of Mt. Kelud, Indonesia,” J. Disaster Res., Vol.12, No.3, pp. 617-630, 2017.
Data files:
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Last updated on Dec. 13, 2018