Scour Hole Characteristics around Abutment in Compound Channel

Abdelaziz, Ahmed Abouelfetouh; Lim, Siow‐Yong

doi:10.1061/9780784480625.036

Cited by 8 publications

(6 citation statements)

References 11 publications

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“…[1] menunjukkan konsistensi gerusan dengan memanfaatkan tanggul abutment yang mudah tererosi. [2] [3] menyatakan pengaruh bentuk panjang abutmen mempengaruhi kedalaman dan lebar gerusan. Selanjutnya menambahkan elemen di dinding abutmen akan mengurangi kedalaman gerusan di abutmen [4][5] [6].…”

Section: Pendahuluanunclassified

PERUBAHAN ELEVASI DASAR PADA ABUTMEN JEMBATAN AKIBAT PROSES KESTABILAN GERAK SEDIMEN TERHADAP PENEMPATAN KRIB DI TIKUNGAN SUNGAI (Studi Kasus : Sungai Harapan, Kabupaten Jayapura)

Widyastuti, I,

Mujiati,

Jansen D. I. R.

2024

KoNTekS

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Gerusan terjadi pada saat kecepatan aliran pada saluran melebihi kecepatan yang menyebabkan material dasar bergerak. Hal ini terjadi pada Sungai Harapan yang memiliki dampak yang sangat signifikan terhadap penurunan dasar sungai dan penyempitan oleh bangunan air (abutmen jembatan) yang melintang di sungai. Penelitian ini bertujuan untuk mengetahui kestabilan gerak sedimen di sekitar abutmen jembatan, sebelum dan sesudah adanya krib sehingga selanjutnya kegagalan struktur dapat terhindarkan. Pengukuran morfologi sungai dan pengambilan sampel sedimen dilakukan di sekitar abutmen jembatan sebanyak 6 titik dan sample material dasar menggunakan metode Pebble Count dengan jalur zigzag. Klasifikasi diameter butir material dasar menggunakan standar klasifikasi sturgess dan proses sebaran material dianalisis menggunakan kurva Hjustorm. Transformasi curah hujan rancang menjadi debit banjir rancang yang kemudian disimulasi menggunakan aplikasi iRIC Nays2DH dengan membandingkan keadaan sungai sebelum dan sesudah pemasangan krib. Variasi rerata diameter butiran berkisar 14.85 - 20.23mm dengan debit aliran 1,838 m3 /s/mm. Pada abutmen tanpa krib di setiap diameter butiran sedimen terjadi gerusan yang langsung bersinggungan dengan abutmen yang berada di sisi kanan. Sedangkan pada abutmen dengan krib, gerusan juga terjadi namun tidak bersinggungan langsung dengan kedua abutmen. Krib melindungi abutmen dari risiko terjadinya gerusan di sekitar struktur abutmen. Degradasi dasar saluran tetap terjadi setelah pemasangan krib, namun degradasi tersebut tidak terjadi di struktur abutmen, krib mencegah dan melindungi abutmen agar dasar sungai tidak tergerus.

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Section: Pendahuluanunclassified

PERUBAHAN ELEVASI DASAR PADA ABUTMEN JEMBATAN AKIBAT PROSES KESTABILAN GERAK SEDIMEN TERHADAP PENEMPATAN KRIB DI TIKUNGAN SUNGAI (Studi Kasus : Sungai Harapan, Kabupaten Jayapura)

Widyastuti, I,

Mujiati,

Jansen D. I. R.

2024

KoNTekS

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“…They proposed an enhancement function at the time of constriction occurrence for the scour prediction around abutments in clear-water conditions. Recently, Abdelaziz and Lim [10] measured experimentally scour near 45°wing wall setback abutments within a compound flume. Also, Abid and Hong [11] studied on the deepest point of scouring around abutments in compound flumes.…”

Section: Experimental Studiesmentioning

confidence: 99%

A pareto design of evolutionary hybrid optimization of ANFIS model in prediction abutment scour depth

et al. 2019

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In this paper, a novel pareto evolutionary structure of adaptive neuro-fuzzy inference system (ANFIS) network is presented for abutment scour depth predicting. The genetic algorithm (GA) and singular value decomposition (SVD) is utilized in optimizing design of nonlinear antecedent parts and linear consequent parts of TSK-type of fuzzy rules simultaneously in ANFIS design for the first time. To this end, first the parameters affecting the scour in the vicinity of abutments are detected. After that, 11 ANFIS-GA/SVD models are introduced through the combination of the parameters affecting the scour. Based on the modeling results, the ANFIS-GA/SVD models predict the scour around abutments with a reasonable accuracy. The superior model forecasts more than 63% of scours with an error of less than 8%. The correlation coefficient (R) for the model is computed roughly 0.978. The value of the average discrepancy ratio for the model is obtained 0.981. In addition, the results of the sensitivity analysis demonstrate that the Froude number (Fr) and the ratio of the flow depth to the radius of the scour hole (h/L) are the most noticeable parameters affecting the scour depth in the vicinity of the abutments. Ultimately, a comparison between the superior model and the previous studies are presented which reveal that the current study has better performance to predict scour depth around abutments.

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“…Water flowing through rivers and streams with high amounts of energy is likely to cause severe scour around bridge foundations. Abutments are essential parts of these foundations that not only link the crown of the bridge to its foundation but also convey load from the superstructure of the bridge to its foundation (Abdelaziz & Lim, 2017, 2020). Kattell & Eriksson (1998) claimed that bridge scour is a major reason of highway bridge failures in the United States.…”

Section: Introductionmentioning

confidence: 99%

Development of scour hole depth around setback abutment in a compound channel

Abdelaziz

Lim

2021

Water & Environment J

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This study focuses on scour depth development around 45° wing‐wall setback abutments in a compound channel. The results show that the scour development curves almost have similar shape and they can be described using exponential function. It is generally observed that the scour hole achieved 80% of the equilibrium scour depth at a scour time equals to 25% of the equilibrium scour time. Additionally, an increase in the relative abutment length and the contraction ratio causes an increase in the equilibrium time. However, this time decrease with increasing flow depth ratio. Finally, new empirical equations are proposed to predict the development of scour depth and the time to reach the equilibrium state. These equations will be useful to predict these characteristics of scour hole especially for setback abutments in compound channel and predict the temporal development scour depth for previous studies that have available data related to maximum scour depth.

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Scour Hole Characteristics around Abutment in Compound Channel

Cited by 8 publications

References 11 publications

PERUBAHAN ELEVASI DASAR PADA ABUTMEN JEMBATAN AKIBAT PROSES KESTABILAN GERAK SEDIMEN TERHADAP PENEMPATAN KRIB DI TIKUNGAN SUNGAI (Studi Kasus : Sungai Harapan, Kabupaten Jayapura)

PERUBAHAN ELEVASI DASAR PADA ABUTMEN JEMBATAN AKIBAT PROSES KESTABILAN GERAK SEDIMEN TERHADAP PENEMPATAN KRIB DI TIKUNGAN SUNGAI (Studi Kasus : Sungai Harapan, Kabupaten Jayapura)

A pareto design of evolutionary hybrid optimization of ANFIS model in prediction abutment scour depth

Development of scour hole depth around setback abutment in a compound channel

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