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All Journal MEKTEK Jurnal Sains dan Teknologi Tadulako
Arody Tanga
Civil Engineering Tadulako University
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Engineering Materials Science & Nanotechnology

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PENGARUH POLA DISTRIBUSI HUJAN TERHADAP PENYIMPANGAN DEBIT PUNCAK HIDROGRAF SATUAN SINTETIK NAKAYASU Tunas, I Gede; Tanga, Arody
MEKTEK Vol 13, No 1 (2011)
Publisher : MEKTEK

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (313.117 KB)

Abstract

There are many methods which used to analyze flood hydrograph, started from the simplest Rational Methods to the most complex mathematical models. One of them is Nakayasu Synthetic Unit Hydrograph (SUH) which has been known and used in wide area. Without realized, actually the use of the methods has been given a large deviation if compared with the measured river hydrograph. It is especially caused by the using of rainfall distribution pattern which be the input of the Nakayasu SUH Methods. This research was conducted to investigate the effect of rainfall distribution pattern to the peak discharge of Nakayasu SUH Methods using some rainfall distribution pattern such as Mononobe, ABM and Tadashi Tanimoto which applied on Bangga watershed. The result of the research using 10 elected flood data show that the average deviation from the biggest to the smallest, respectively are Mononobe (69.42 %), ABM (59.44 %) and Tadashi Tanimoto (22.42 %)
EFFECT OF PLAN SHAPE ON HYDRAULIC CHARACTERISTICS OF LABYRINTH WEIRS Arody Tanga; Muh. Galib Ishak; Yassir Arafat
Jurnal Sains dan Teknologi Tadulako Vol 9 No 1 (2023): April 2023
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/jstt.v9i1.446

Abstract

Labyrinth weirs have a longer crest length compared to linear weirs to increase the discharge capacity for a given water head. Generally, the plan shape of labyrinth weirs is triangular, trapezoidal, and rectangular. In this regard, several studies have been published regarding determining the hydraulic characteristics of labyrinth weirs. However, the effect of changing the plan shape if other parameters such as the same length and height have not been addressed in the current literature. To fill this gap, this study aims to compare the hydraulic characteristics of flow over triangular, trapezoidal, and rectangular labyrinth weirs with the same length of the crest i.e. 230 cm length. Experiments study were conducted in a flume with a length of 16 m and a width of 95 cm. Three experimental models in this study were used. The results of this study indicated that changing the plan shape from trapezoidal to triangular increased the discharge coefficient (Cd) by about 38,0% on average. Furthermore, changing rectangular to triangular increased the Cd by about 64,5% on average. Thus, it can be concluded that the triangular model was the most efficient hydraulically compared to the others while the rectangular model was the least efficient.
Co-Authors I Gede Tunas Muh. Galib Ishak Yassir Arafat