Analisa Pola Gerusan Sedimen pada Hilir Bendung PLTM Bantaeng-1 Kabupaten Bantaeng Provinsi Sulawesi Selatan.

Abi, Fakhri (2016) Analisa Pola Gerusan Sedimen pada Hilir Bendung PLTM Bantaeng-1 Kabupaten Bantaeng Provinsi Sulawesi Selatan. Sarjana thesis, Universitas Brawijaya.

Abstract

Perencanaan bendung PLTM dipengaruhi oleh berbagai aspek teknis yaitu kondisi topografi, geologi, jenis material dasar sungai, morfologi sungai dan hidrolika. Agar didapatkan konstruksi bangunan bendung yang layak, harus dilakukan studi-studi sebagai dasar perencanaan. Adanya pembangunan bendung menyebabkan perubahan karakteristik aliran seperti kecepatan atau turbulensi sehingga menimbulkan perubahan transport sedimen dan terjadinya gerusan serta perubahan pola aliran sungai. Penggunakan kolam olak type USBR sekalipun masih menimbulkan gerusan pada dasar saluran di hilir kolam olak. Hal ini dapat menyebabkan kerusakan pada bangunan tersebut. Metode yang digunakan dalam menganalisa pola gerusan adalah pemodelan numerik dengan program SSIIM 2 (Sediment Simulation in Intakes with Multiblock Option). Pemodelan fisik perlu dilakukan untuk sarana kalibrasi dan verifikasi model numerik. Proses kalibrasi dilakukan dengan membandingkan volume gerusan pada model fisik dan model numerik dengan menggunakan metode absolute error. Dari hasil pemodelan didapat kesalahan absolut dari perbandingan volume gerusan pada model fisik dan numerik sebesar 18,04%. Pola gerusan yang terjadi dari hasil model numerik pada Q 100 tahun (debit banjir rancangan untuk desain perencanaan) terbaca pada hilir bendung sedalam 0,5 m dari elevasi sungai dasar asli. Dari analisa desain dan pemodelan dapat dinilai kurang efektifnya bangunan peredam energi tipe roller bucket. Direkomendasikan bangunan pengaman hilir sungai dengan konstruksi bronjong sepanjang 4 m dengan slope negative agar aliran dari bendung dan peredam energi tidak terlalu kritis sehingga dapat mengurangi bahaya dari gerusan pada konstruksi.

Item Type: Thesis (Sarjana)
Identification Number: SKR/FT/2016/149/051601855
Subjects: 600 Technology (Applied sciences) > 627 Hydraulic engineering > 627.5 Reclamations, Irrigation, related topics > 627.52 Irrigation
Divisions: Fakultas Teknik > Teknik Pengairan
Depositing User: Budi Wahyono Wahyono
Date Deposited: 17 Mar 2016 15:13
Last Modified: 22 Oct 2021 01:13
URI: http://repository.ub.ac.id/id/eprint/144310
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