Efficient river water quality index prediction considering minimal number of inputs variables
Document Type
Article
Publication Date
1-1-2020
Abstract
Water Quality Index (WQI) is the most common determinant of the quality of the stream-flow. According to the Department of Environment (DOE, Malaysia), WQI is chiefly affected by six factors, which are, chemical oxygen demand (COD), biochemical oxygen demand (BOD), dissolved oxygen (DO), suspended solids (SS), -potential for hydrogen (pH), and ammoniacal nitrogen (AN). In fact, understanding the inter-relationships between these variables and WQI can improve predicting the WQI for better water resources management. The aim of this study is to create an input approach using ANNs (Artificial Neural Networks) to compute the WQI from input parameters instead of using the indices of the parameters when one of the parameters is absent. The data are collected from the nine water quality monitoring stations at the Klang River basin, Malaysia. In addition, comprehensive sensitivity analysis has been carried out to identify the most influential input parameters. The model is based on the frequency distribution of the significant factors showed exceptional ability to replicate the WQI and attained very high correlation (98.78%). Furthermore, the sensitivity analysis showed that the most influential parameter that affects WQI is DO, while pH is the least one. Additionally, the performance of models shows that the missing DO values caused deterioration in the accuracy. © 2020, © 2020 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.
Keywords
Surface water hydrology, Artificial Neural Networks, modelling, water quality index
Divisions
fac_eng
Funders
University of Malaya Research Grants (RU001-2017C, GPF070A-2018, RF015B-2018),2020106TELCO grant by the Innovation & Research Management Center (iRMC), Universiti Tenaga Nasional (UNITEN)
Publication Title
Engineering Applications of Computational Fluid Mechanics
Volume
14
Issue
1
Publisher
Taylor & Francis