Electronic Theses and Dissertation

Tsunami Palu tahun 2018 menyebabkan perubahan besar terhadap morfologi kawasan pesisir dan Daerah Aliran Sungai (DAS) Palu, termasuk dinamika sedimentasi yang terjadi pascabencana. Penelitian ini bertujuan untuk menganalisis volume angkutan sedimen dari DAS Palu selama enam tahun setelah tsunami menggunakan metode Modified Universal Soil Loss Equation (MUSLE), serta mengevaluasi akumulasi aktual sedimen di Teluk Palu. Analisis dilakukan secara spasial menggunakan data tutupan lahan, jenis tanah, curah hujan harian, dan topografi dari model Forest and Buildings Removed Digital Elevation Model (FABDEM), yang diolah dengan perangkat lunak Sistem Informasi Geografis (SIG). Estimasi erosi permukaan dihitung menggunakan metode Modified Universal Soil Loss Equation (MUSLE) dan dikalibrasi dengan nilai Sediment Delivery Ratio (SDR) sebesar 0,18, berdasarkan luas DAS. Hasil menunjukkan bahwa total volume sedimen dari DAS Palu selama periode 2019-2024 mencapai 1.399.862 m³, dengan volume yang mencapai outlet DAS sebesar 256.910 m³. Akumulasi aktual di Teluk Palu berdasarkan analisis batimetri tahun 2019 dan 2024 menunjukkan volume positif sebesar 812.508,4 m³ dan erosi dasar laut sebesar 416.502,4 m³, sehingga menghasilkan volume netto sebesar 396.006 m³. Nilai ini menunjukkan bahwa sedimen dari DAS Palu merupakan kontributor utama terhadap akumulasi sedimen di Teluk Palu. Meski demikian, kemungkinan adanya kontribusi tambahan dari proses lain seperti longsoran bawah laut, erosi pantai, atau aktivitas manusia tetap perlu diperhitungkan. Penelitian ini berkontribusi penting dalam pemahaman sedimentasi pascatsunami dan perencanaan pengelolaan DAS serta wilayah pesisir secara berkelanjutan.
Kata kunci: sedimen, sungai palu, MUSLE, tsunami, teluk palu

The 2018 Palu tsunami caused major changes to the morphology of the coastal area and the Palu River Basin (DAS), including post-disaster sedimentation dynamics. This study aims to analyze sediment transport volume from the Palu River Basin over six years following the tsunami using the Modified Universal Soil Loss Equation (MUSLE) method, as well as to evaluate actual sediment accumulation in Palu Bay. The analysis was conducted spatially using land cover data, soil type, daily rainfall, and topography from the Forest and Buildings Removed Digital Elevation Model (FABDEM), processed using Geographic Information System (GIS) software. Surface erosion estimates were calculated using the Modified Universal Soil Loss Equation (MUSLE) method and calibrated with a Sediment Delivery Ratio (SDR) value of 0.18, based on the watershed area. The results show that the total sediment volume from the Palu watershed during the 2019-2024 period reached 1.399.862 m³, with a volume reaching the watershed outlet of 256.910 m³. Actual accumulation in Palu Bay based on bathymetric analysis in 2019 and 2024 showed a positive volume of 812,508.4 m³ and seabed erosion of 416,502.4 m³, resulting in a net volume of 396,006 m³. This value indicates that sediments from the Palu watershed are the main contributor to sediment accumulation in Palu Bay. However, the possibility of additional contributions from other processes such as submarine landslides, coastal erosion, or human activities still needs to be considered. This research contributes significantly to the understanding of post-tsunami sedimentation and the planning of sustainable watershed and coastal zone management. Keywords: sediment, palu river, MUSLE, tsunami, palu bay