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All Journal JURNAL TEKNIK HIDRAULIK
Shandy Cecilia
Balai Litbang Penerapan Teknologi Permukiman Puslitbang KPT, Yogyakarta
Civil Engineering, Building, Construction & Architecture Engineering

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Penerapan Teknologi Sabo sebagai Penahan Laju Sedimentasi Pada Muara Danau Limboto Ardian Alfianto; Shandy Cecilia; Banata Wachid Ridwan; Chitra Widyasani Surya Putri
JURNAL TEKNIK HIDRAULIK Vol 11, No 1 (2020): Jurnal Teknik Hidraulik
Publisher : Pusat Litbang Sumber Daya Air, Kementerian Pekerjaan Umum dan Perumahan Rakyat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32679/jth.v11i1.609

Abstract

Lake siltation due to erosion and sedimentation in Limboto Lake has happened since 1932. Based on 2017 analysis, lake contriction reached 4,000 (88,81 hectares annually). So, Limboto is predicted to go extinct in 2031. Since 2017, sabo dam implementation includes a series of effort called ‘Limboto Lake Revitalization’ to retain sedimentation flow. This study aims to review and to compare existing data with latest primary data collected. Measurement of sedimentation potential volume is done using software WaTEM/SEDEM, sabo design, and sabo plan. Overall, sabo plan designed by Sulawesi II River Basin Office is sufficient to accommodate potential of erotion and sedimentation flow in Limboto, despite the hypothesis that sabo dam amount is lacking and structure is positioned unfit with sabo design standard. The review shows that based on accommodating capacity, it is not necessary to add structure in upstream river. On the other hand, based distance between structures, each river requires at least 1 additional structure. This study advises an additional of capacity surge to 1.111.537 cubic meters. Batulayar section has the biggest capacity of 193.662 cubic meters per year, while the smallest is located in Tabongo1 with a capacity of 11.031 cubic meters per year. Updating and scheduled sabo dam review are required.
PEMODELAN POTENSI EROSI DAN SEDIMENTASI HULU DANAU LIMBOTO DENGAN WATEM/SEDEM Ardian Alfianto; Shandy Cecilia
JURNAL TEKNIK HIDRAULIK Vol 11, No 2 (2020): Jurnal Teknik Hidraulik
Publisher : Pusat Litbang Sumber Daya Air, Kementerian Pekerjaan Umum dan Perumahan Rakyat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32679/jth.v11i2.613

Abstract

Erosion and sedimentation caused 4,000-hectare siltation in Limboto. Experts predicted that Limboto will be extinct in 2031. Revitalization program ‘Limboto Lake Revitalization’ has been carried out since 2017, with sabo technology as the action carried out to restrain sedimentation rate and to save the lake from extinction. This study aims to measure erosion and sedimentation potential in upstream of Limboto including 12 rivers (sub-DAS), using WaTEM/SEDEM model Two outputs resulted through this study are total sedimentation potential and identification of sedimentation zoning on each river. Based on soil type and other triggering factors, 5 of 20 rivers have the biggest sedimentation potential to deliver to Limboto, namely Batulayar 193.662 m3, Biyonga Baluta 123.095 m3, Alo1 120.273 m3, Alo 115.204 m3 and Molamahu 73.058 m3. The model was visually calibrated by considering the rivers’ sedimentation volume collected by JICA and BWS Sulawesi II. The result shows different score depending on the soil type, slope, land cover and other parameters. Sabo dam has to be reviewed regularly and on-schedule, since its current data is not actual and upstream rivers have highly dynamic and fluctuative sediment as well.
Co-Authors Ardian Alfianto Ardian Alfianto Banata Wachid Ridwan Chitra Widyasani Surya Putri