Rahman, Kurdianto Idi (2019) Analisis Sedimentasi Waduk Wlingi Menggunakan Model Fujiyama. Sarjana thesis, Universitas Brawijaya.
Abstract
Permasalahan sedimentasi di waduk Wlingi secara signifikan dipengaruhi oleh aktivitas vulkanik Gunung Kelud. Sedimentasi disebabkan oleh banjir sedimen dari anak sungai yang mengalir dari lereng Gunung Kelud. Kapasitas tampungan total Waduk Wlingi tahun 2016 telah berkurang sebesar 81,5% atau hanya 4,45 juta m3 dari tampungan awal 24 juta m3. Saat ini belum banyak model numeris yang digunakan untuk pendugaan erosi dan sedimentasi waduk akibat dari erupsi gunung berapi yang diterapkan di Indonesia. Dalam penelitian ini akan dibahas mengenai analisis sedimentasi Waduk Wlingi dengan menggunakan Model Fujiyama untuk memprediksi erosi dan sedimentasi di Waduk Wlingi akibat material Gunung Kelud sehingga dapat digunakan sebagai acuan dalam kegiatan penanganan sedimentasi waduk. Model Fujiyama adalah model numeris limpasan sedimen terpadu yang dikembangkan oleh Masaharu Fujita dan Kazuki Yamanoi. Model ini dikembangkan dengan mengintegrasikan model sub-proses produksi sedimen, sub-proses pasokan sedimen, dan sub-proses transportasi sedimen menggunakan model cekungan yang terdiri dari unit saluran dan unit lereng. Model ini dapat menghitung debit air dan debit sedimen serta endapan sedimen di sungai. Sedimentasi Waduk Wlingi berdasarkan data historis tampungan sebesar 500.000 m3/tahun. Hasil simulasi model didapatkan debit limpasan hasil perhitungan model sedikit lebih besar dari debit pengamatan. Total sedimen kumulatif hasil perhitungan model tahun 2016 sebesar 598.828 m3, lebih besar dari sedimen rerata per tahun. Mekanisme pengangkutan sedimen didominasi oleh sedimen layang, atau muatan sedimen dasar yang ketika bergerak dalam jumlah besar akan bergerak dengan mekanisme transportasi sedimen layang. Untuk gerakan sedimen dasar dengan mekanisme aliran dasar, tidak dapat digambarkan dengan jelas oleh model. Namun agradasi dan degradasi dalam proses perubahan dasar sungai terjadi selama tahun 2016. Secara umum dapat dinyatakan bahwa hasil penerapan model di DAS waduk Wlingi cukup baik.
English Abstract
The sedimentation problem in the Wlingi reservoir is significantly influenced by the volcanic activity of Mount Kelud. Sedimentation is caused by flooding of sediments from tributaries from the slopes of Mount Kelud. The total storage capacity of the Wlingi Reservoir in 2016 has decreased by 81.5% or only 4.45 million m3 from the initial storage of 24 million m3. At now, not many numerical models are used to estimate erosion and sedimentation of reservoirs due to volcanic eruptions applied in Indonesia. This research will discuss the sedimentation analysis of the Wlingi Reservoir using the Fujiyama Model to predict erosion and sedimentation in the Wlingi Reservoir due to the Mount Kelud material so that it can be used as a reference in handling reservoir sedimentation activities. The Fujiyama Model is an integrated sediment runoff numerical model developed by Masaharu Fujita and Kazuki Yamanoi. This model was developed by integrating the sediment production sub-process model, sediment supply sub-process, and sediment transportation sub-process using a basin model consisting of unit channels and unit slopes. This model can calculate water discharge, sediment discharge and sediment deposition in rivers. Annual sedimentation of Wlingi Reservoir about 500,000 m3/year based on historical reservoir data. The model simulation results obtained runoff discharge model calculation results slightly higher than the observed discharge. The total cumulative sediment in 2016 calculation by the model is about 598,828 m3, higher than the annual sedimentation. The sediment transport mechanism is dominated by suspended load, or bed load which is moving in large numbers by the sediment transport mechanism. For bed load sediment movements with a basic flow mechanism, the model cannot be clearly described. However agradation and degradation in the process of riverbed change occurred during 2016. Generally, it can be stated that the results of applying the model in the Wlingi reservoir watershed are good enough.
Other obstract
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| Item Type: | Thesis (Sarjana) |
|---|---|
| Identification Number: | TES/551.353 028 5/RAH/a/2019/042000488 |
| Uncontrolled Keywords: | SEDIMENTATION ANALYSIS--COMPUTER PROGRAMS |
| Subjects: | 500 Natural sciences and mathematics > 551 Geology, hydrology, meteorology > 551.3 Surface and exogenous processes and their agents > 551.35 Geologic work of water > 551.353 Transporting and depositing materials > 551.353 028 5 Computer programs |
| Divisions: | S2/S3 > Magister Teknik Pengairan, Fakultas Teknik |
| Depositing User: | Budi Wahyono Wahyono |
| Date Deposited: | 20 Jan 2020 06:36 |
| Last Modified: | 25 Oct 2021 06:54 |
| URI: | http://repository.ub.ac.id/id/eprint/178129 |
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