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All Journal Paduraksa : Jurnal Teknik Sipil Universitas Warmadewa
La’la Monica
Program Studi Teknik Sipil, Universitas Sam Ratulangi, Manado, Sulawesi Utara, Indonesia
Civil Engineering, Building, Construction & Architecture Environmental Science

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Pengaruh aliran sungai panasen terhadap proses sedimentasi di Danau Tondano Liany Amelia Hendratta; Arthur Haris Thambas; Lusia Manu; La’la Monica
PADURAKSA: Jurnal Teknik Sipil Universitas Warmadewa Vol. 13 No. 2 (2024)
Publisher : Program Studi Teknik Sipil, Fakultas Teknik dan Perencanaan, Universitas Warmadewa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22225/pd.13.2.10720.131-137

Abstract

Land use changes and inappropriate land use in the Panasen watershed cause sedimentation in Lake Tondano. The influence of sediment-laden flow on the sedimentation process is still a problem that needs to be studied. The occurrence of flooding in the downstream part of the river due to the process of river silting is a problem that has an impact on economic losses, environmental problems and even unresolved social conflicts. This study aims to obtain the factors causing flooding by evaluating the capacity of the Panasen river cross-section in the downstream part and analyzing the influence of the Panasen River sediment flow on the sedimentation process in Lake Tondano. The study was conducted through field observations in the form of river geometry measurements and sediment flow sampling. Secondary data, namely topographic maps, rainfall data and measured discharge data were obtained from related agencies. Various analyses carried out were hydrological analysis, hydraulic analysis and sedimentation analysis. The hydrological analysis used maximum daily rainfall data obtained from the Noongan rainfall station and measured river discharge from the Noongan River AWLR. The magnitude of flood discharge using the HEC-HMS model with calibrated parameters for various return periods of 2, 5, 10, 25, 50 and 100 years were obtained at 50.2 m3/sec, 71.6 m3/sec, 82.1 m3/sec, 91.8 m3/sec, 97.2 m3/sec and 101.4 m3/sec. From the hydraulic analysis, it was obtained that under Q100 and lake tides, all river segments were unable to accommodate flood discharge. The flood water level (overflow) was at 1.2 - 3.1 meters and tended to occur towards the right river bank. The amount of sediment transport was determined after obtaining the dissolved sediment content, which was 6.16 gr/m3, resulted in an average increase in sediment volume to the lake for 30 years of 3,215,104.7 m³ or a thickness of 72.15 mm. The results of the study showed that the amount of sediment entering the lake was quite large, so that management efforts were needed in the Panasen River watershed, namely in the form of land conservation measures and determining appropriate land use.
Sistem lahan basah buatan untuk mereduksi sedimen dan polutan di Sungai Tougela Kabupaten Minahasa La’la Monica; Liany Amelia Hendratta; Olivia Maria Tumurang
PADURAKSA: Jurnal Teknik Sipil Universitas Warmadewa Vol. 15 No. 1 (2026)
Publisher : Program Studi Teknik Sipil, Fakultas Teknik dan Perencanaan, Universitas Warmadewa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22225/pd.15.1.14438.45-52

Abstract

Lake Tondano, a national priority lake, has experienced increasing sedimentation and declining water quality due to sediment and pollutant loads from its inlet rivers, including the Tougela River. Agricultural activities, settlements, and hydrological conditions contribute significantly to elevated sediment and nutrient inputs, particularly phosphate, which threaten the sustainability of the lake ecosystem. This study aims to analyze flood flow characteristics, sedimentation, and water quality of the Tougela River, as well as to evaluate the application of constructed wetlands as a measure to control sediment and pollutant loads before entering Lake Tondano. The research method includes hydrological analysis using the rational method to estimate design flood discharge, analysis of suspended sediment concentration, and water quality assessment based on BOD, COD, and phosphate parameters. Data were obtained through field measurements, water sampling, and rainfall data analysis. A floating constructed wetland was applied with emergent plants, planting media and floating media made of bamboo and anchors. The selected emergent plants were local aquatic macrophytes, namely water hyacinth (Eichornia crassipes) and water spinach (Ipomoea aquatica) which are available at the research site. The results indicate that sedimentation in the Tougela River reaches 160.95 g/s at the 50-year return period flood discharge. BOD and COD values comply with water quality standards, while phosphate concentrations only meet Class III–IV standards. The constructed wetland reduced phosphate concentrations by 10–24.5% and suspended sediment by 4.6%. The water flow in the floating constructed  wetland was still influenced by the lake’s water flow, which affected the observation results, but its application has the potential as a nature-based solution for reducing sediment and pollutant loads.
Co-Authors Arthur Haris Thambas Liany Amelia Hendratta Lusia Manu Olivia Maria Tumurang