Womsiwor, Isabella Sari (2026) Perencanaan Penanggulangan Banjir Di Desa Usilimo, Distrik Usilimo, Kab. Jayawijaya, Papua Pegunungan Dengan Memanfaatkan Data Satelit GPM IMERG Terkoreksi. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Desa Usilimo terletak di Kabupaten Jayawijaya, Papua Pegunungan, memiliki kerentanan tinggi terhadap banjir luapan Sungai Baliem akibat karakteristik topografi ekstrem. Analisis mitigasi di wilayah ini terkendala oleh defisit kerapatan spasial stasiun penakar hujan permukaan (ungauged catchment), sehingga diatasi dengan memanfaatkan estimasi presipitasi satelit Global Precipitation Measurement (GPM) IMERG V07. Guna mereduksi bias sistematis sensor satelit, diterapkan kalibrasi menggunakan algoritma statistik Empirical Quantile Mapping (EQM) terhadap data observasi BMKG Wamena via R Studio. Evaluasi model pada fase verifikasi independen (2022-2025) membuktikan keandalan EQM dengan kesuksesan mereduksi Root Mean Square Error (RMSE) menjadi 0,0058 mm dan mempertahankan tingkat Koefisien Korelasi (R) yang sangat kuat sebesar 0,9968. Matriks data satelit terkoreksi tersebut kemudian dianalisis frekuensinya menggunakan distribusi Generalized Extreme Value (GEV) yang teruji kesesuaiannya dengan metode Smirnov-Kolmogorov guna mengakomodasi curah hujan ekstrem berekor tebal. Transformasi hidrologi alih ragam hujan-aliran dikonvolusikan melalui metode Hidrograf Satuan Sintetis (HSS) Nakayasu. Untuk skenario pembebanan periode ulang 25 tahun, diperoleh debit puncak rancangan (Q25) sebesar 419,04 m³/detik yang membebani titik tinjau pada jam ke-5,83. Evaluasi hidrolika dieksekusi melalui pemodelan aliran tunak satu dimensi (1D Steady Flow) menggunakan HEC-RAS. Hasil simulasi mengonfirmasi bahwa kapasitas penampang alami eksisting (QKapasitas) gagal meredam debit Q25, sehingga memicu elevasi muka air menabrak batas tebing (overtopping) secara masif ke area bantaran. Sebagai justifikasi teknis rekayasa, direkomendasikan penanganan struktural berupa normalisasi sungai di sepanjang titik sungai tinjauan dengan penggerukan sedalam 2,5 m dari elevasi tanah dasar asli serta penambahan tinggi tanggul seragam 2 m pada titik-titik yang setelah dianalisis membutuhkan keamanan tambahan.
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Usilimo Village, in Jayawijaya Regency, Papua Pegunungan, exhibits a high vulnerability to flood inundation from the Baliem River due to its extreme topographic characteristics. Mitigation analysis in this region is fundamentally constrained by the sparse spatial density of surface rain gauges (ungauged catchment), which is addressed by utilizing precipitation estimates from the Global Precipitation Measurement (GPM) IMERG V07 satelliteTo reduce the systematic bias of the satellite sensors, spatial calibration is applied using the Empirical Quantile Mapping (EQM) statistical algorithm against BMKG Wamena observation data via R Studio. Model evaluation during the independent verification phase (2022-2025) proves the reliability of EQM, successfully reducing the Root Mean Square Error (RMSE) to 0.0058 mm while maintaining a very strong Correlation Coefficient (R) of 0.9968. The corrected satellite data matrix is subsequently subjected to frequency analysis using the Generalized Extreme Value (GEV) distribution, validated by the Smirnov-Kolmogorov test to accommodate heavy-tailed extreme rainfall anomalies. The rainfall-runoff hydrological transformation is convoluted utilizing the Nakayasu Synthetic Unit Hydrograph (SUH) method. For the 25-year return period loading scenario, a design peak discharge ordinate (Q25) of 419.04 m³/s is obtained, occurring at hour 5.83. Hydraulic evaluation is executed through one-dimensional steady flow modeling using HEC-RAS. The simulation confirms that the existing natural channel capacity (QCapacity) fails to attenuate the shock load, triggering severe water surface elevation exceeding the bank stations (overtopping) into the overbanks. Simulation results confirm that the existing natural channel capacity is insufficient to contain the Q25 discharge, causing the water level to rise and massively overtop the banks into the floodplain. To provide a technical engineering justification, structural intervention is recommended in the form of river normalization along the observed sections; this entails dredging to a depth of 2.5 meters below the original riverbed elevation and raising embankments by a uniform 2 meters at locations identified as requiring additional safety measures.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Generalized Extreme Value (GEV) , GPM IMERG, Penanganan Banjir, Quantile Mapping, Usilimo. Flood Management, Generalized Extreme Value (GEV), GPM IMERG, Quantile Mapping, Usilimo. |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering > TC530 Flood control |
| Divisions: | Faculty of Civil Engineering and Planning > Civil Engineering > 22201-(S1) Undergraduate Thesis |
| Depositing User: | Isabella Sari Womsiwor |
| Date Deposited: | 31 Jul 2026 01:39 |
| Last Modified: | 31 Jul 2026 01:39 |
| URI: | http://repository.its.ac.id/id/eprint/140037 |
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