Simulation of Flow Profile Response to Alternate Bar Formation in Rivers

Alternate bars are common in alluvial rivers. The formation of alternate bars is derived from the instability of flow and sediment in the channel. The formation of the alternate bars causes the changes in hydrodynamics condition in the channel. This study presents the analysis on the impact of alter...

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Published in:Lecture Notes in Civil Engineering
Main Author: Salleh M.Z.M.; Ibrahim Z.; Jumain M.; Saari R.; Fathullah M.F.M.; Ismail Z.; Jamal M.H.
Format: Book chapter
Language:English
Published: Springer 2020
Online Access:https://www.scopus.com/inward/record.uri?eid=2-s2.0-85077547144&doi=10.1007%2f978-3-030-32816-0_92&partnerID=40&md5=6a2203de20e9d140b6362e1e8800b11f
id 2-s2.0-85077547144
spelling 2-s2.0-85077547144
Salleh M.Z.M.; Ibrahim Z.; Jumain M.; Saari R.; Fathullah M.F.M.; Ismail Z.; Jamal M.H.
Simulation of Flow Profile Response to Alternate Bar Formation in Rivers
2020
Lecture Notes in Civil Engineering
53

10.1007/978-3-030-32816-0_92
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85077547144&doi=10.1007%2f978-3-030-32816-0_92&partnerID=40&md5=6a2203de20e9d140b6362e1e8800b11f
Alternate bars are common in alluvial rivers. The formation of alternate bars is derived from the instability of flow and sediment in the channel. The formation of the alternate bars causes the changes in hydrodynamics condition in the channel. This study presents the analysis on the impact of alternate bar formation on the characteristic of flow in the channel. The objective of the study is to investigate the effect of alternate bars on the flow distribution. The study was observed through 2D computer simulation analysis by using Nays2DH solver in iRIC software. The length and width of the channel used were 12 and 0.5 m, respectively. The channel bed was initially set to be flat. The discharge was kept constant with different sediment sizes. The study found that the direction of the velocity of water was diverted away from the alternate bars after these bars were formed. Furthermore, the variation of sediment size does not majorly affect the conditions of the alternate bar; thus not also affected the flow profile. However, the velocity was progressively increased from upstream to downstream in the channel with a bigger size of bed material. Additionally, the velocity also was higher at the center but lowered on both sides of the channel. The profiles of velocity were mainly parallel with the bed level, where the velocity was higher as the bed level increased. © Springer Nature Switzerland AG 2020.
Springer
23662557
English
Book chapter

author Salleh M.Z.M.; Ibrahim Z.; Jumain M.; Saari R.; Fathullah M.F.M.; Ismail Z.; Jamal M.H.
spellingShingle Salleh M.Z.M.; Ibrahim Z.; Jumain M.; Saari R.; Fathullah M.F.M.; Ismail Z.; Jamal M.H.
Simulation of Flow Profile Response to Alternate Bar Formation in Rivers
author_facet Salleh M.Z.M.; Ibrahim Z.; Jumain M.; Saari R.; Fathullah M.F.M.; Ismail Z.; Jamal M.H.
author_sort Salleh M.Z.M.; Ibrahim Z.; Jumain M.; Saari R.; Fathullah M.F.M.; Ismail Z.; Jamal M.H.
title Simulation of Flow Profile Response to Alternate Bar Formation in Rivers
title_short Simulation of Flow Profile Response to Alternate Bar Formation in Rivers
title_full Simulation of Flow Profile Response to Alternate Bar Formation in Rivers
title_fullStr Simulation of Flow Profile Response to Alternate Bar Formation in Rivers
title_full_unstemmed Simulation of Flow Profile Response to Alternate Bar Formation in Rivers
title_sort Simulation of Flow Profile Response to Alternate Bar Formation in Rivers
publishDate 2020
container_title Lecture Notes in Civil Engineering
container_volume 53
container_issue
doi_str_mv 10.1007/978-3-030-32816-0_92
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-85077547144&doi=10.1007%2f978-3-030-32816-0_92&partnerID=40&md5=6a2203de20e9d140b6362e1e8800b11f
description Alternate bars are common in alluvial rivers. The formation of alternate bars is derived from the instability of flow and sediment in the channel. The formation of the alternate bars causes the changes in hydrodynamics condition in the channel. This study presents the analysis on the impact of alternate bar formation on the characteristic of flow in the channel. The objective of the study is to investigate the effect of alternate bars on the flow distribution. The study was observed through 2D computer simulation analysis by using Nays2DH solver in iRIC software. The length and width of the channel used were 12 and 0.5 m, respectively. The channel bed was initially set to be flat. The discharge was kept constant with different sediment sizes. The study found that the direction of the velocity of water was diverted away from the alternate bars after these bars were formed. Furthermore, the variation of sediment size does not majorly affect the conditions of the alternate bar; thus not also affected the flow profile. However, the velocity was progressively increased from upstream to downstream in the channel with a bigger size of bed material. Additionally, the velocity also was higher at the center but lowered on both sides of the channel. The profiles of velocity were mainly parallel with the bed level, where the velocity was higher as the bed level increased. © Springer Nature Switzerland AG 2020.
publisher Springer
issn 23662557
language English
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