Simulasi Skenario Penanggulangan Banjir DAS Manikin Kabupaten Kupang

Pukan, Mariano Ado Galot (2025) Simulasi Skenario Penanggulangan Banjir DAS Manikin Kabupaten Kupang. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Genangan banjir di Sungai Manikin sering terjadi di Desa Tarus, Kecamatan Kupang Tengah, Kabupaten Kupang. Luas DAS Manikin 89,340 km² dan panjang Sungai utama 9,62 km. Hulu Sungai Manikin berada di wilayah Baun dan bermuara di Teluk Kupang dipinggir Desa Manikin. Banjir biasa terjadi di Sungai Manikin setiap tahun, hal ini disebabkan apabila terjadi hujan deras dengan intensitas curah hujan yang tinggi dengan durasi lama. Sungai Manikin setiap tahun mengalami limpasan banjir yang menggenangi daerah persawahan, tegalan, dan permukiman. Daerah permukiman yang tergenang limpasan banjir pada saat datangnya musim penghujan adalah masyarakat yang berada di sekitar muara Sungai Manikin. Penelitian ini menggunakan data curah hujan satelit GSMaP (Global Satelite Mapping of Precipitation) karena kurangnya data curah hujan pos di daerah penelitian. Metode transformasi hujan debit HSS Nakayasu, HSS Snyder, HSS GAMA 1 dan program HEC-HMS (SCS Curve Number) untuk Analisa Hidrologi, kemudian untuk melakukan analisa genangan menggunakan program HEC-RAS. Pada penelitian ini dilakukan 3 skenario penanggulangan banjir berupa skenario 1 (Normalisasi sungai + Pembangunanan atau Peningkatan Tanggul), skenario 2 (Pembangunanan atau Peningkatan Tanggul + Kolam Retensi) dan skenario 3 adalah gabungan skenario 1 dan skenario 2. Hasil kalibrasi Analisa Hidrologi yang mendekati debit dengan lapangan adalah metode HEC-HMS (SCS Curve Number), maka didapatkan debit puncak untuk periode 2, 5, 10, 25 dan 50 tahun secara berurutan 148,60 m³/dtk, 263,30 m³/dtk, 352,40 m³/dtk, 479,50 m³/dtk, dan 580,70 m³/dtk. Sedangkan hasil model genangan, skenario yang paling baik untuk menangurangi luasan genangan adalah skenario 1, maka diperoleh hasil skenario 1 dengan periode 2, 5, 10, 25, dan 50 yang dapat menurunkan luas genangan dengan periode 2, 5, 10, 25 dan 50 secara berurutan dengan persentase 96,25%, 93,60%, 85,76%, 67,15%, 55,31%. ===========================================================================================
Flood inundation of the Manikin River often occurs in Tarus Village, Central Kupang District, Kupang Regency. The Manikin watershed area is 89.340 km² and the main river length is 9.62 km. The upstream of the Manikin River is in the Baun area and downstream into Kupang Bay on the edge of Manikin Village. Flooding is common in the Manikin River every year, this is caused when there is heavy rainfall with high rainfall intensity and long duration. Every year, the Manikin River experiences flood runoff that inundates rice fields, moorlands and residential areas. Residential areas that are inundated by flood runoff during the rainy season are communities around the mouth of the Manikin River. This study uses GSMaP (Global Satellite Mapping of Precipitation) satellite rainfall data due to the lack of postal rainfall data in the study area. The rain discharge transformation method of HSS Nakayasu, HSS Snyder, HSS GAMA 1 and the HEC-HMS (SCS Curve Number) program for Hydrological Analysis, then to perform inundation analysis using the HEC-RAS program. In this study, 3 flood management scenarios were carried out in the form of the first scenario (River Normalization + Embankment Construction or Improvement), the second scenario (Embankment Construction or Improvement + Retention Pond) and the third scenario is a combination of the first scenario and the second scenario. The results of the Hydrological Analysis calibration that is close to the discharge with the field is the HEC-HMS (SCS Curve Number) method, then obtained peak discharge for the period of 2, 5, 10, 25 and 50 years in order 148.60 m³/s, 263.30 m³/s, 352.40 m³/s, 479.50 m³/s, and 580.70 m³/s. While the results of the inundation model, the scenario that is close to the discharge with the field is the HEC-HMS method. While the results of the inundation model, the best scenario to reduce the inundation area is scenario 1, then the results of scenario 1 with periods 2, 5, 10, 25, and 50 are obtained which can reduce the inundation area with periods 2, 5, 10, 25 and 50 sequentially with a percentage of 96.25%, 93.60%, 85.76%, 67.15%, 55.31%.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Manikin Watershed, GSMap, HSS Nakayasu, HSS Snyder, HSS GAMA 1, SCS Curve Number, HEC-HMS, HEC-RAS, Das Manikin, GSMap, HSS Nakayasu, HSS Snyder, HSS GAMA 1, SCS Curve Number
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC530 Flood control
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis
Depositing User:	Mariano Ado Galot Pukan
Date Deposited:	03 Feb 2025 01:33
Last Modified:	03 Feb 2025 01:33
URI:	http://repository.its.ac.id/id/eprint/117515

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