Staff View: Assessing reaeration rate equations for modelling dissolved oxygen of Pusu River in Malaysia

Assessing reaeration rate equations for modelling dissolved oxygen of Pusu River in Malaysia

Many authors reported high variability in the prediction of reaeration rates by various equations, leading to uncertainty in the estimation of the reaeration rate for a river. Due to this uncertainty, it is essential to identify a suitable equation to predict the dissolved oxygen (DO) concentration...

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Main Authors:	Al-Mamun, Abdullah, Nuruzzaman, M, Salleh, Md Noor
Format:	Article
Language:	English
Published:	Akademi Sains Malaysia (ASM) 2023
Subjects:	TD Environmental technology. Sanitary engineering TD169 Environmental protection
Online Access:	http://irep.iium.edu.my/109684/1/109684_Assessing%20reaeration%20rate.pdf http://irep.iium.edu.my/109684/ https://www.akademisains.gov.my/asmsj/article/assessing-reaeration-rate-equations-for-modelling-dissolved-oxygen-of-pusu-river-in-malaysia/
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spelling	my.iium.irep.1096842025-02-26T04:01:46Z http://irep.iium.edu.my/109684/ Assessing reaeration rate equations for modelling dissolved oxygen of Pusu River in Malaysia Al-Mamun, Abdullah Nuruzzaman, M Salleh, Md Noor TD Environmental technology. Sanitary engineering TD169 Environmental protection Many authors reported high variability in the prediction of reaeration rates by various equations, leading to uncertainty in the estimation of the reaeration rate for a river. Due to this uncertainty, it is essential to identify a suitable equation to predict the dissolved oxygen (DO) concentration of the river in concern. Pusu River in Malaysia receives sewage discharges and suffers from land-clearing activities and stormwater-related pollution. Pusu River is a small river, but highly important in terms of demography and geographic location. As such, it is required to identify a suitable reaeration rate equation for predicting its DO concentration, which indicates the overall health of a river. The purpose of this study is to assess the suitability of reaeration rate equations to predict Dissolved Oxygen (DO) concentrations of the Pusu River. The water quality analysis simulation program (WASP) model was employed to model the DO of the Pusu River. Reaeration rates calculated from the available 31 equations were given input in the model and errors in prediction were calculated in terms of Root Mean Square (RMS) error and R2 for every equation. It was revealed that Neguluscu and Rojanski (1969) equation using depth and velocity as the variables performed best among all the equations. It produced a minimum RMS error of 0.17 and 0.09 mg/L in calibration and validation data, respectively. R2 values for predicted-observed plots were 0.98 and 0.97 in these two data sets using the equation. Based on overall Performance Indicator Values (PIVs), reaeration rate equations with depth and velocity as the variables performed better than the other equations with more variables for Pusu River. This study provided important information to accurately model the DO of the Pusu River for future simulation of different scenarios. Akademi Sains Malaysia (ASM) 2023-12-29 Article PeerReviewed application/pdf en http://irep.iium.edu.my/109684/1/109684_Assessing%20reaeration%20rate.pdf Al-Mamun, Abdullah and Nuruzzaman, M and Salleh, Md Noor (2023) Assessing reaeration rate equations for modelling dissolved oxygen of Pusu River in Malaysia. ASM Science Journal, 18. pp. 1-14. ISSN 1823-6782 E-ISSN 2682-8901 https://www.akademisains.gov.my/asmsj/article/assessing-reaeration-rate-equations-for-modelling-dissolved-oxygen-of-pusu-river-in-malaysia/ 10.32802/asmscj.2023.1193
institution	Universiti Islam Antarabangsa Malaysia
building	IIUM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	International Islamic University Malaysia
content_source	IIUM Repository (IREP)
url_provider	http://irep.iium.edu.my/
language	English
topic	TD Environmental technology. Sanitary engineering TD169 Environmental protection
spellingShingle	TD Environmental technology. Sanitary engineering TD169 Environmental protection Al-Mamun, Abdullah Nuruzzaman, M Salleh, Md Noor Assessing reaeration rate equations for modelling dissolved oxygen of Pusu River in Malaysia
description	Many authors reported high variability in the prediction of reaeration rates by various equations, leading to uncertainty in the estimation of the reaeration rate for a river. Due to this uncertainty, it is essential to identify a suitable equation to predict the dissolved oxygen (DO) concentration of the river in concern. Pusu River in Malaysia receives sewage discharges and suffers from land-clearing activities and stormwater-related pollution. Pusu River is a small river, but highly important in terms of demography and geographic location. As such, it is required to identify a suitable reaeration rate equation for predicting its DO concentration, which indicates the overall health of a river. The purpose of this study is to assess the suitability of reaeration rate equations to predict Dissolved Oxygen (DO) concentrations of the Pusu River. The water quality analysis simulation program (WASP) model was employed to model the DO of the Pusu River. Reaeration rates calculated from the available 31 equations were given input in the model and errors in prediction were calculated in terms of Root Mean Square (RMS) error and R2 for every equation. It was revealed that Neguluscu and Rojanski (1969) equation using depth and velocity as the variables performed best among all the equations. It produced a minimum RMS error of 0.17 and 0.09 mg/L in calibration and validation data, respectively. R2 values for predicted-observed plots were 0.98 and 0.97 in these two data sets using the equation. Based on overall Performance Indicator Values (PIVs), reaeration rate equations with depth and velocity as the variables performed better than the other equations with more variables for Pusu River. This study provided important information to accurately model the DO of the Pusu River for future simulation of different scenarios.
format	Article
author	Al-Mamun, Abdullah Nuruzzaman, M Salleh, Md Noor
author_facet	Al-Mamun, Abdullah Nuruzzaman, M Salleh, Md Noor
author_sort	Al-Mamun, Abdullah
title	Assessing reaeration rate equations for modelling dissolved oxygen of Pusu River in Malaysia
title_short	Assessing reaeration rate equations for modelling dissolved oxygen of Pusu River in Malaysia
title_full	Assessing reaeration rate equations for modelling dissolved oxygen of Pusu River in Malaysia
title_fullStr	Assessing reaeration rate equations for modelling dissolved oxygen of Pusu River in Malaysia
title_full_unstemmed	Assessing reaeration rate equations for modelling dissolved oxygen of Pusu River in Malaysia
title_sort	assessing reaeration rate equations for modelling dissolved oxygen of pusu river in malaysia
publisher	Akademi Sains Malaysia (ASM)
publishDate	2023
url	http://irep.iium.edu.my/109684/1/109684_Assessing%20reaeration%20rate.pdf http://irep.iium.edu.my/109684/ https://www.akademisains.gov.my/asmsj/article/assessing-reaeration-rate-equations-for-modelling-dissolved-oxygen-of-pusu-river-in-malaysia/
_version_	1827438541584465920
score	13.251813

Assessing reaeration rate equations for modelling dissolved oxygen of Pusu River in Malaysia

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