Wijaya, Hanggoro Iskandar Putra (2021) Model Pengaruh Rob Pada Sistem Drainase Sringin Dan Tenggang Terhadap Banjir Di Kawasan Semarang Timur. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Kota Semarang merupakan daerah yang sering terjadi banjir rob setiap hujan, terutama kawasan Semarang Timur. Hal ini dikarenakan pasang air laut dan air hujan yang tidak tertampung di sungai/saluran pembuang sehingga meluap dan terjadi genangan. Untuk mengatasi masalah ini, terdapat pembangunan tanggul laut sepanjang pesisir Sungai Sringin dan Sungai Tenggang. Bangunan ini akan membendung air laut sehingga sistem drainase Sringin dan Tenggang terisolasi secara hidrologi. Sistem drainase di kawasan tersebut akan berujung pada hilir saluran. Perlunya penelitian untuk mengetahui pengaruh muka air laut pada sistem drainase Sringin dan Tenggang terhadap banjir di Kawasan Semarang Timur.
Analisis model genangan di kawasan Semarang Timur menggunakan aplikasi HEC-RAS, dimana simulasi dilakukan dengan batas hulu yaitu flow hydrograph dengan periode ulang 2th, 5th, dan 10th. Dilakukan kalibrasi datum pada titik bench mark untuk menyamakan elevasi model dengan elevasi data muka air laut. Simulasi dilakukan pada sistem drainase Sringin dan Tenggang sampai hilir saluran menuju ke laut. Selanjutnya dilakukan kalibrasi dengan kondisi tersebut agar model mendekati kondisi lapangan. Dilakukan 2 skenario model dipengaruhi oleh elevasi muka air rata-rata(MSL) senilai 1,366. Skenario selanjutnya model dipengaruhi oleh tinggi pasang tertinggi (HHWL) senilai 2,048.
Hasil penelitian ini, daerah genangan terjadi pada skenario yang dipengaruhi oleh MSL debit 2 th sebesar 282.036m2, debit 5th sebesar 392.604m2 dan debit 10th sebesar 450.127m2. Selanjutnya untuk elevasi HHWL debit 2 th sebesar 418.645m2, debit 5th sebesar 642.075m2 dan debit 10th sebesar 686.489m2. Diketahui bahwa genangan yang terjadi sangat dipengaruhi oleh debit banjir tahunan dan elevasi air laut.
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Semarang city is an area that often encounter tidal flood, particularly in East Semarang. This disaster was due to sea tides and rainwater which did not accommodated in the river/waste channel, cause overflow and inundation. To overcome this issue, a sea wall was constructed along the coast of Sringin River and Tenggang River. This building repressed seawater, therefore the Sringin and Tenggang drainage systems are hydrologically isolated. The drainage system in this area is end up at downstream of the channel. The background of this study was to determine the effect of sea level on the Sringin and Tenggang drainage systems towards tidal flood in East Semarang.
The analysis of inundation model in East Semarang used HEC-RAS application, in which the simulation was performed with the upstream boundary, namely the flow hydrograph with 2th, 5th, and 10th return periods. Datum calibration was conducted at the bench mark point to equalize the model elevation with the sea level data elevation. Simulations were carried out on the Sringin and Tenggang drainage systems until the channel downstream to the sea. Further, calibration was performed in this condition so that the model was similar with field conditions. Researcher performed two model scenarios influenced by mean sea level (MSL) of 1,366 . The next scenario model was influenced by the highest high water level (HHWL) of 2,048.
The result of study , the inundation area height occurred in the scenario with influenced by MSL with 2th, 5th, and 10th return periods is 282.036m2, 392.604m2, 450.127m2. The next, was influenced by HHWL with 2th, 5th, and 10th return periods is 414.645m2, 624.075m2, 686.489m2 It is acquainted that the inundation was strongly influenced by the elevation of annual flood discharge and sea level.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Rob, Banjir, Drainase, HEC-RAS 2D, Kota Semarang, Tidal Flood; Flood; HEC-RAS 2D; Semarang city |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TC Hydraulic engineering. Ocean engineering |
| Divisions: | Faculty of Civil Engineering and Planning > Environment Engineering > 25101-(S2) Master Thesis |
| Depositing User: | HANGGORO ISKANDAR PUTRA WIJAYA |
| Date Deposited: | 23 Aug 2021 09:54 |
| Last Modified: | 21 Jun 2024 03:45 |
| URI: | http://repository.its.ac.id/id/eprint/88922 |
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