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All Journal Indonesian Journal of Geography Jurnal Teknik Sipil dan Perencanaan Dinamika Teknik Sipil Matriks Teknik Sipil Sustainable Civil Building Management and Engineering Journal
Cahyono Ikhsan
Jurusan Teknik Sipil, Universitas Sebelas Maret
Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Engineering Materials Science & Nanotechnology

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Journal : Jurnal Teknik Sipil dan Perencanaan

 1 
The Effect Of Lamong River Flow Diversion To Bed Surface Degradation Ikhsan, Cahyono
Jurnal Teknik Sipil dan Perencanaan Vol 22, No 2 (2020): Jurnal Teknik Sipil & Perencanaan
Publisher : Semarang State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jtsp.v22i2.24449

Abstract

Abstract Kali Lamong River with a trapezoidal channel shape has a bottom width of about 30 m, a top width of 40 m and a depth of 3.5 m. In one of the river segments, the basis is in the form of a fixed bed and it is assumed that there is no sediment transport in this section. On the downstream side after the fixed bed section, the river segment is a mobile bed with river bed material that has an average grain diameter of 1.5 mm, a relative mass density of 2.6, and porosity of 0.3. Flowrate with Q50 is 1000.00 m3/sec with a maximum flow speed of 15 m/sec. Riverbed degradation will occur initially at the upstream point in the fixed and mobile beds. Depth of riverbed degradation calculated by the Parabolic model of 80.00 cm / year based on the solution of the equation.
The Effect Of Lamong River Flow Diversion To Bed Surface Degradation Ikhsan, Cahyono
Jurnal Teknik Sipil dan Perencanaan Vol 22, No 2 (2020)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jtsp.v22i2.24449

Abstract

Abstract Kali Lamong River with a trapezoidal channel shape has a bottom width of about 30 m, a top width of 40 m and a depth of 3.5 m. In one of the river segments, the basis is in the form of a fixed bed and it is assumed that there is no sediment transport in this section. On the downstream side after the fixed bed section, the river segment is a mobile bed with river bed material that has an average grain diameter of 1.5 mm, a relative mass density of 2.6, and porosity of 0.3. Flowrate with Q50 is 1000.00 m3/sec with a maximum flow speed of 15 m/sec. Riverbed degradation will occur initially at the upstream point in the fixed and mobile beds. Depth of riverbed degradation calculated by the Parabolic model of 80.00 cm / year based on the solution of the equation.
PEMBUATAN LAPISAN PELINDUNG (ARMOURING) SEBAGAI BAHAN PEMBENTUK STABILITAS DASAR PERMUKAAN SUNGAI Ikhsan, Cahyono
Jurnal Teknik Sipil dan Perencanaan Vol 14, No 1 (2012): Jurnal Teknik Sipil & Perencanaan
Publisher : Semarang State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jtsp.v14i1.14455

Abstract

Abstrak: Gradasi butir sedimen yang bergerak di dasar saluran atau sungai dengan berbagai variasi ukuran material menyebabkan terjadinya proses selective erosion selama proses aliran, yang memungkinkan terjadi perubahan struktur lapisan dasarnya. Terbentuknya lapisan armour secara alamiah dapat mempertahankan bentuk konfigurasi dasar sungai tersebut, namun bagaimana proses pembentukan lapisan armour, perubahan struktur lapisan penyusunnya serta kekasaran permukaannya menjadi sesuatu yang penting pada pencapaian  tujuan penelitian ini. Penelitian ini dilakukan di laboratorium Hidraulika menggunakan perangkat utama  sediment-recirculating flume terbuat dari plexiglass berdimensi lebar 0,60 m, panjang 10,00 m, tinggi 0,45 m serta kemiringan dasar yang dapat diatur hingga 3%. Flume ini dilengkapi dua pompa yang berkapasitas debit sampai dengan 150 l/dt. Material yang dipakai dicampur dengan komposisi 70% gravel, 30% pasir. Running dilakukan pada debit konstan, baik pada saat debit aliran low flow maupun hight flow, dan untuk setiap ranning terdapat 3 fase yaitu fase equilibrium, fase armour. Instrumen yang digunakan antara lain digital currentmeter, point gauge meter, sediment feeder, sediment trap, dan dibantu software surfer 8.0. Hasil penelitian tersebut dapat menggambarkan proses terjadinya armouring didasarkan pada kondisi aliran dan perilaku sedimen dasar bergerak, yang dinyatakan dengan adanya perubahan struktur lapisan dasar dan perubahan topografi permukaan dasar. Jadi dapat disimpulkan bahwa adanya  sedimen dasar yang bergerak pada struktur lapisan mengakibatkan terbentuknya lapisan armouring yang berpengaruh pada stabilitas dasar saluran dan aman terhadap bahaya erosi dan degradasi.
Co-Authors Achmad, Fariza Rubawi Andi Renata Ade Yudono Arifandi, Fakhrizal Azhari, Dony Budi Utomo Danisworo, Conrad Firmansyah, Indra Koosdaryani Koosdaryani Mregawati, Pury Pratama, Wildan Yoga Risdiyanto, Yudi Sobriyah Sobriyah Suntoro Suntoro Suyanto Suyanto Zulhusni, Atsari Fildzah