Krisnaldi Idris, Krisnaldi
Staf Pengajar Departemen Teknik Sipil FTSP-ITB.

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Application of Large-Scale 3D Non-Orthogonal Boundary Fitted Sediment Transport Model and Small-Scale Approach for Offshore Structure in Cimanuk Delta North Java Sea Muin, Muslim; Idris, Krisnaldi; Yuanita, Nita
Journal of Engineering and Technological Sciences Vol 48, No 3 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1283.742 KB) | DOI: 10.5614/j.eng.technol.sci.2016.48.3.5

Abstract

The morphology of the Cimanuk Delta at the North Java Sea has changed rapidly over the last two decades. The annual sediment deposition is about two million cubic meters (Yuanita and Tingsanchali, [1]). The large-scale ocean hydrodynamics and sediment transport model MuSed3D (Muin, [2]) was applied to the North Java Sea to simulate suspended sediment transport at the study site. A potential offshore structure was positioned at approximately 30 km from the Cimanuk Delta. The result of the large-scale model was calibrated using observation data and Landsat satellite image interpretation. The agreement between the modeling results and the observations was excellent. It was found that the critical shear stresses for erosion and deposition were 0.1 Pa and 0.05 Pa respectively. An empirical formula was further utilized to assess the local scouring at the potential offshore structure site in a small-scale domain and under extreme conditions.
Transmisi Gelombang pada Breakwater Tenggelam Kinog, Ketut; Tuah, Hang; Wurjanto, Andojo; Idris, Krisnaldi
Jurnal Teknik Sipil Vol 11, No 3 (2004)
Publisher : Institut Teknologi Bandung

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Abstract

Abstrak. Kerusakan pantai dalam bentuk abrasi pantai, telah merupakan masalah bagi banyak negara. Untuk pemecahannya, para ahli telah mengembangkan banyak jenis bangunan seperti revetment, groin dan detached breakwater. Walaupun jenis bangunan tersebut sebagian telah dapat mencegah abrasi, tapi umumnya dianggap tidak ramah lingkungan, khususnya ditinjau dari sudut pandang kepariwisataan. Makalah ini mencoba mencari bentuk bangunan pengaman pantai yang ramah lingkungan, dengan mengambil sifat terumbu karang, yaitu berupa breakwater tenggelam. Bahasan difokuskan pada kemampuan breakwater tenggelam meredam gelombang datang, dengan pendekatan berupa hubungan parameter kecuraman gelombang Hi/gT2 versus koefisien transmisi Ct = Ht /Hi , untuk parameter b/L dan d/h tertentu.Hasilnya berupa grafik transmisi gelombang, yang menunjukkan bahwa Ct menjadi semakin kecil bila b/L atau d/h semakin besar.Abstract. Beach damages in the form of beach erosion, has been made problems in many countries. For solving the problem, the experts have been developed many kinds of structure, as revetment, grion and detached breakwater. Although a part of the structure succeed to restrain the beach erosion, but generally it is not friendly environmental, especially from the tourism view. This paper try to develop friendly environmental beach protection, by taking the coral characteristic, in the form of submerged breakwater. The analysis is focused in the capability of the submerged breakwater in reducing the incident waves, which be approahed by the relation of wave steepness Hi/gT2 versus transmission coefficient Ct = Ht /Hi , for certain b/L and d/h. The result is wave transmission figures, which show that the bigger value of b/L or d/h the smaller value of Ct.
Stabilitas Armor pada Breakwater Tenggelam Kinog, Ketut; Tuah, Hang; Wurjanto, Andojo; Idris, Krisnaldi
Jurnal Teknik Sipil Vol 12, No 1 (2005)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (194.898 KB)

Abstract

Abstrak. Untuk pengamanan pantai, tinggi gelombang dapat direduksi dengan membuat breakwater tenggelam. Untuk penggunaan armor sebagai bangunan pantai, Hudson (1959) telah mengembangkan koefisien stabilitas KD untuk armor batu. Parameter gelombang yang dilibatkan hanya tinggi gelombang H. Penelitian ini juga mempelajari masalah koefisien stabilitas KD, tapi parameter yang dilibatkan adalah parameter gelombang (H dan T) dan parameter breakwater d/h, sedangkan armor yang digunakan ada 3 jenis armor, yaitu A-jack, tetrapod dan kubus. Studi difokuskan untuk menentukan hubungan antara kecuraman gelombang H/gT2 dan koefisien stabilitas KD, untuk harga parameter d/h tertentu. Hasil penelitian menunjukkan bahwa untuk harga d/h yang sama, maka harga KD(A-jack) lebih besar dari pada KD(tetrapod) dan KD(tetrapod) lebih besar dari pada KD(kubus). Abstract. For beach protection practice, submerged breakwater can reduse the wave height, the wave height can be reduced by constructing submerged breakwater. Hudson (1959) had developed the stability coefficient KD for stone armor, which involve only the wave parameter H for beach protection structure. This research is also studying the stability coefficient KD, but more wave parameters (H,T), and breakwater parameter d/h, and 3 of artificial armor (A-jack, tetrapod and cube). The relation between the wave steepness H/gT2 and the stability coefficient KD for certain parameter d/h is estabilished. The result shows, that for the same value of d/h, KD(A-jack) is greater than KD(tetrapod) and KD(tetrapod) is greater than KD(cube).