ALFARIZI, NUR RASSYIDHIN (2026) ANALISIS PENGARUH FLUKTUASI DEBIT TERHADAP MUKA AIR PADA SUNGAI SENGAYAM. S1 thesis, Universitas Mercu Buana Jakarta.
|
Text (HAL COVER)
01 cover.pdf Download (985kB) | Preview |
|
![[img]](https://repository.mercubuana.ac.id/style/images/fileicons/text.png) |
Text (BAB I)
02 BAB 1.pdf Restricted to Registered users only Download (467kB) |
|
|
Text (BAB II)
03 BAB 2.pdf Restricted to Registered users only Download (1MB) |
|
|
Text (BAB III)
04. BAB 3.pdf Restricted to Registered users only Download (798kB) |
|
|
Text (BAB IV)
05 BAB 4.pdf Restricted to Registered users only Download (1MB) |
|
|
Text (BAB V)
06 BAB 5.pdf Restricted to Registered users only Download (463kB) |
|
|
Text (DAFTAR PUSTAKA)
07 DAFTAR PUSTAKA.pdf Restricted to Registered users only Download (291kB) |
|
|
Text (LAMPIRAN)
08 LAMPIRAN.pdf Restricted to Registered users only Download (3MB) |
Abstract
This research analyzes the influence of return period flood discharge on water surface elevation in the Sengayam River, South Kalimantan, in order to evaluate channel capacity under design flood conditions and to identify potential overtopping sections. The investigated variables include hydrological parameters in the form of design flood discharges for return periods of 2, 10, 25, 50, and 100 years, and hydraulic parameters represented by computed water surface elevations. Secondary data consisting of maximum daily rainfall from 2010–2024 were obtained from three rainfall stations: Geofisika Gusti Syamsir Alam, Sultan Aji Muhammad Sepinggan, and Sanggu Barito Selatan. Areal rainfall over the 107.640 km² watershed was determined using the Thiessen polygon method.Hydrological analysis was conducted using the Nakayasu Synthetic Unit Hydrograph (HSS Nakayasu) to estimate peak discharges for each return period. Subsequently, one-dimensional hydraulic modeling was performed using HEC-RAS to simulate longitudinal water surface profiles corresponding to the design discharges.The hydrological results indicate peak discharges of approximately Q2 = 257,17 m3 /s, Q10 = 251,78 m3 /s, Q25 = 356,99 m3 /s, Q50 = 335,82 m3 /s, dan Q100 = 372,03 m3 /s. HEC-RAS simulations demonstrate a consistent increase in water surface elevation with increasing discharge. In the upstream reach, computed water levels range from 3.54 m to 5.02 m (Q2–Q100), while in the downstream reach they range from 3.50 m to 4.37 m. Overtopping is identified at several cross-sections, particularly P-01, P-05, P-13 to P-18, P-24, and P-25, under medium to high return periods.A strong discharge–stage correlation is observed and modeled using power functions: upstream reach H = 0,42 Q 0,4075and downstream reach H = 0,677 Q 0,3136, both with R2 ≈ 0,999. The results confirm a direct hydraulic response of water level to discharge fluctuations, emphasizing the necessity of channel capacity management as part of flood mitigation strategies in the Sengayam watershed Keywords: Flood Discharge, Water Surface Elevation, HEC-RAS, Nakayasu SUH. Penelitian ini menganalisis pengaruh fluktuasi debit terhadap muka air pada Sungai Sengayam, Kalimantan Selatan, guna mengidentifikasi kapasitas penampang sungai dalam menampung debit rencana serta potensi terjadinya luapan. Variabel penelitian mencakup karakteristik hidrologi berupa debit banjir rencana periode ulang (2, 10, 20, 50, dan 100 tahun) serta parameter hidraulika berupa tinggi muka air. Data yang digunakan merupakan data sekunder curah hujan harian maksimum periode 2010–2024 dari tiga stasiun pengamatan: Geofisika Gusti Syamsir Alam, Sultan Aji Muhammad Sepinggan, dan Sanggu Barito Selatan. Penentuan curah hujan wilayah pada Daerah Aliran Sungai (DAS) seluas 107.640 km² dilakukan menggunakan metode poligon Thiessen. Analisis hidrologi dilakukan dengan metode Hidrograf Satuan Sintetik (HSS) Nakayasu untuk memperoleh debit periode ulang dan pemodelan hidraulika numerik menggunakan perangkat lunak HEC-RAS untuk memperoleh profil muka air akibat variasi debit periode ulang. Hasil penelitian menunjukkan bahwa peningkatan debit banjir rencana menyebabkan kenaikan tinggi muka air secara signifikan pada beberapa penampang kritis. Hasil hidrologi menunjukkan debit puncak rencana untuk Q2 = 257,17 m3 /s, Q10 = 251,78 m3 /s, Q25 = 356,99 m3 /s, Q50 = 335,82 m3 /s, dan Q100 = 372,03 m3 /s. Simulasi HEC-RAS memperlihatkan kenaikan tinggi muka air yang sejalan dengan peningkatan debit: pada segmen hulu tinggi muka air berkisar 3.54–5.02 m (Q2–Q100) dan pada segmen hilir 3,50–4,37 m. Luapan teridentifikasi pada beberapa penampang (terutama P-01, P-05, P-13–P-18, P-24, P-25) untuk kala ulang menengah hingga besar. Korelasi antara debit dan muka air kuat, dimodelkan dengan fungsi pangkat (hulu: H = 0.42 Q 0.4075; hilir: H = 0.677 Q 0.3136 dengan R2 = 0.999 ). Penelitian ini menyimpulkan bahwa fluktuasi debit memiliki hubungan langsung terhadap perubahan tinggi muka air, sehingga diperlukan pengelolaan kapasitas sungai sebagai upaya mitigasi risiko banjir di DAS Sengayam. Kata kunci: debit banjir, tinggi muka air, HEC-RAS, HSS Nakayasu.
| Item Type: | Thesis (S1) |
|---|---|
| NIM/NIDN Creators: | 41121110031 |
| Uncontrolled Keywords: | debit banjir, tinggi muka air, HEC-RAS, HSS Nakayasu. |
| Subjects: | 600 Technology/Teknologi > 620 Engineering and Applied Operations/Ilmu Teknik dan operasi Terapan > 624 Civil Engineering/Teknik Sipil 600 Technology/Teknologi > 620 Engineering and Applied Operations/Ilmu Teknik dan operasi Terapan > 624 Civil Engineering/Teknik Sipil > 624.2 Bridges Engineering/Teknik Jembatan |
| Divisions: | Fakultas Teknik > Teknik Sipil |
| Depositing User: | khalimah |
| Date Deposited: | 12 Mar 2026 01:45 |
| Last Modified: | 12 Mar 2026 01:45 |
| URI: | http://repository.mercubuana.ac.id/id/eprint/101550 |
Actions (login required)
 |
View Item |
