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Pengaruh Kecuraman Gelombang Bangunan Bawah Air Geotube Terhadap Profil Pantai Pasir Buatan Amaliah, Tuty
JOURNAL TEKNIK SIPIL DAN INFRASTRUKTUR Vol 7, No 1 (2017)
Publisher : Jurusan Teknik Sipil Universitas Tadulako

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Abstract

Beach damage is a serious problem which requires prompt action from the government. Adding more sediment to the beach (beach nourishment) is one of the efforts to cope with the problem. However, the sediment filled is usually carried away by the wave, which consequently brings maintenance costs for dealing with the sandpile during certain periods, as well as the need for large volume of excavation. One of the alternatives to reduce the loss of the sediment pile is by constructing off-shore submerged structure with the crest of the structure is set submerged and made from geotube. The objective of this study was to identify the influence of wave steepness to the beach profile formed behind the structure. The physical model test was carried out to the sand of Tanjung Ann beach (d50=1.47 mm) under two conditions: without the submerged structure and with the geotube submerged structure within wave period (1; 1.2; 1.4; 1.6; and 1.8 second), wave height (6,7,8,9,10,12,14, and 16 cm). The laboratory scale (small scale) was used. Model was placed in the wave channel with initial profile slope of 1:6 and was subject to constant regular wave until the beach profile balance was achieved. Results of this study showed that the beach profile slope was formed behind the geotube submerged structure and grouped into two zones: the swash zone and the breaking zone. The swash zone was where the highest run up and the lowest run down occurred and the breaking zone is where the Dean’s formula applied. The influence of wave steepness (increasing Ho/Lo) was the increasing setback of the beach profile behind the geotube submerged structure. It would give benefit when the H0/L0 ≤ 0.068 for constant structure height.
KAJIAN LAJU ANGKUTAN SEDIMEN DASAR PADA SUNGAI PONDO – POBOYA Oktavia, Siti Rahmi; Lipu, Sance; Amaliah, Tuty; Mesi, Evan
STABILITA || Jurnal Ilmiah Teknik Sipil Vol 7, No 3 (2019): STABILITA || Jurnal Ilmiah Teknik Sipil
Publisher : Universitas Halu Oleo

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Abstract

ABSTRAKSungai merupakan sarana yang sangat penting dalam proses pengangkutan sedimen dimana sungai berfungsi untuk mengalirkan material sedimen dari hasil erosi yang nantinya akan diteruskan ke laut. Sungai Pondo - Poboya merupakan salah satu sungai yang berada di Kota Palu yang memiliki panjang mencapai ± 20 km dengan dasar sungai berupa material granuler yang pasti akan mengalami transportasi sedimen secara individu yang disebabkan oleh kecepatan aliran di dalam sungai.Tujuan penelitian ini adalah untuk mengetahui besarnya laju angkutan sedimen dasar pada Sungai Pondo - Poboya. Laju angkutan sedimen dasar pada Sungai Pondo - Poboya dihitung dengan menggunakan Metode Meyer-Peter and Muller berdasarkan pada debit banjir rencana periode ulang 5 tahun, 10 tahun, 25 tahun, 50 tahun dan 100 tahun.Hasil analisis memperlihatkan bahwa nilai laju angkutan sedimen dasar terbesar terjadi pada saat debit banjir periode ulang 100 tahun pada Lokasi 2 yaitu sebesar 1,26544 m3/det dan laju angkutan sedimen dasar terkecil terjadi pada Lokasi 3 yaitu sebesar 0,37895 m3/det. Dari hasil tersebut dapat dilihat bahwa pada Lokasi 3 akan terjadi agradasi pada dasar sungai, hal ini dikarenakan jumlah angkutan sedimen yang masuk ke Lokasi 3 lebih besar dari pada jumlah angkutan sedimen yang keluar. Kata Kunci :   Angkutan sedimen dasar, Metode Meyer-Peter and Muller, Agradasi, Sungai Pondo - Poboya.ABSTRACTRiver is a very important means in the process of transporting sediment, where the river serves to drain the sediment material from the erosion that will be forwarded to the sea. Pondo - Poboya River is one of the rivers in Palu which has a length of ± 20 kilometers. Pondo - Poboya river has a basic granular material that will inevitably occur sediment transport caused by flow velocity in the river.The purpose of this study is to know the amount of bed-load sediment transport on Pondo - Poboya River. Bed-load sediment transport on Pondo - Poboya River was analyzed by using Meyer-Peter and Muller Method at the time of flood discharge period of 5 years, 10 years, 25 years, 50 years and 100 years.The result of the analysis shows that the largest bed-load sediment transport at the time of flood discharge period of 100 years occurred at location 2 of 1,26544 m3/s and the smallest bed-load sediment transport occurred at location 3 of 0,37895 m3/s. It is seen that at Location 3 there will be aggradation on the the river bed, this is because the amount of sediment transport coming into location 3 is greater than the amount of sediment transport out. Keywords  :    Bed-load Sediment Transport, Meyer-Peter and Muller Method,  Aggradation, Pondo - Poboya River.