scholarly journals Application of fuzzy evaluation technique and grey clustering method for water quality assessment of the coastal and estuaries of selected rivers in Sarawak

2021 ◽  
Vol 45 (1) ◽  
Author(s):  
Ebenezer Aquisman Asare ◽  
Zaini Bin Assim ◽  
Rafeah Binti Wahi ◽  
Rajuna Bin Tahir ◽  
Eric Kwabena Droepenu
Keyword(s):  
Water Quality ◽  
Water Quality Index ◽  
Classification System ◽  
Quality Index ◽  
Comprehensive Evaluation ◽  
Fuzzy Comprehensive Evaluation ◽  
Evaluation Methods ◽  
Marine Water ◽  
Water Quality Parameter ◽  
Grey Clustering

Abstract Background Estuarine and marine water quality has remarkable importance because these water resources are used for multiple reasons for instance: transportation, tourism, recreation, and other human or economic ways to use water. The objective of the study was to assess the water quality of the coastal and estuaries of the Rambungan, Sibu, Salak, and Santubong rivers in Sarawak, Malaysia. Water samples were collected from 10 locations and analyzed by employing standard techniques. A fuzzy comprehensive evaluation, grey clustering evaluation methods, Thailand Marine Water Classification System, and the Malaysian Marine Water Quality Index (MMWQI) and its classification system were applied to compute the index of each water quality parameter. Results The results showed that all the analyzed water quality parameters were within the allowable threshold levels. The results obtained by the application of fuzzy comprehensive evaluation and grey clustering evaluation methods proved that the coastal and the estuaries waters were clean with exception of coastal location CZ9 and the estuary of Salak river which showed slight pollution. Based on the Malaysian Marine Water Quality Index, it was observed that all the locations were in the classification group of moderate (i.e. 50–79%). This suggests that the estuaries of selected rivers can be used for natural resource conservation, while the coastal regions are good for fish farming. Conclusion It can be deduced that the suggested techniques were workable and logical. The method developed and the information in this study can serve as a reference and decision support for scientists and policymakers of concern.

scholarly journals Comparing the results of water quality assessment by fuzzy comprehensive evaluantion method and the water quality index: a case study in the Dong Nai river

2014 ◽  
Vol 17 (2) ◽  
pp. 40-49
Author(s):  
Tran Hoang Bao Le ◽  
Ly Dinh Che ◽  
Than Hien Nguyen
Keyword(s):  
Water Quality ◽  
Water Quality Index ◽  
Urban Areas ◽  
Quality Index ◽  
Comprehensive Evaluation ◽  
Evaluation Model ◽  
Fuzzy Comprehensive Evaluation ◽  
Water Quality Assessment ◽  
Entropy Weight ◽  
Pollution Levels

The Dong Nai river is a source of supplying water for Ho Chi Minh city, Bien Hoa city and industrial areas. However, the status of the Dong Nai river has been seriously polluted which were caused by emission sources from urban areas, industrial zones, etc. In this study, the fuzzy comprehensive evaluation model (FCE) based on Entropy weight method was built to calculate pollution levels for 18 monitoring sites of the Dong Nai river with 7 parameters in the period 2005 – 2012. The results of study showed that the water quality of section 1 and section 2 are I level which mean good level. Section 3 is III ranking – medium pollution and section 4 is II ranking – slight pollution. Besides, the study also compared the results of the water quality between FCE and the water quality index (WQI). The results indicated that there isn’t difference between two methods. However, the FCE method is more practical, reasonable and acceptable. FCE was less affected by abnormal values than WQI.

Water-Quality Assessment of Lv-Tang River in Zhanjiang, China

2013 ◽  
Vol 295-298 ◽  
pp. 755-758 ◽  
Author(s):  
Ya Yun Liu ◽  
Zhi Hong Li ◽  
Xiao Jian Liang ◽  
Yan Peng Lin ◽  
Rong Hao Wu ◽  
...  
Keyword(s):  
Water Quality ◽  
Water Quality Index ◽  
Quality Index ◽  
Oxygen Demand ◽  
Pollution Index ◽  
Ammonia Nitrogen ◽  
Single Parameter ◽  
Water Quality Parameter ◽  
National Quality

Based on the water quality investigation data of December in 2010, the water environment quality of Lv-tang River in Zhanjiang national urban wetland park was assessed using single water quality parameter model and integrated water quality index model. The results show that the water quality of Lv-tang River is worse than the national quality standards for Grade V. The water is polluted seriously. The main pollutants are total nitrogen (TN), ammonia nitrogen (NH3-N) and chemical oxygen demand CODCr with their average concentrations of 60.49 mg/L, 30.57 mg/L and 227.38mg/L, respectively. The averages of their single parameter pollution index are 30.25 , 19.79 and 8.74. The average of single parameter pollution index of the river is 8.23 which indicated that the river belongs to heavy pollution zone. The integrated water quality index was 22.5 showing that the river belongs to serious pollution zone.

scholarly journals The impact of Land use Change on Water Pollution Index of Kali Madiun Sub-watershed

2017 ◽  
Vol 31 (1) ◽  
pp. 128-137
Author(s):  
Pranatasari Dyah Susanti ◽  
Arina Miardini
Keyword(s):  
Water Quality ◽  
Land Use ◽  
Land Use Change ◽  
Water Quality Index ◽  
Quality Index ◽  
Pollution Index ◽  
Industrial Wastes ◽  
Quality Analysis ◽  
Water Quality Parameter ◽  
The Impact

Land use change is one of the effects of population growth and increased human activities. Land use change that overlooked the rule of ecosystem sustainability has a propensity to adversely affect the environment, including the decline of water quality. Kali Madiun is a sub-watershed of Bengawan Solo Watershed that allegedly endured the impacts of land use change. This study aimed to investigate the impacts of land use change on the water quality index of Kali Madiun Sub-watershed. Land use change analysis was done by overlay analysis of spatial data including the maps of land use in 2010 and 2015. Samples were the surface water in the upper, middle and lower part of Kali Madiun Sub-Watershed. Water quality analysis was carried out by comparing the results of water quality parameter assessment based on Government Regulation No. 82 of 2001, while water quality index was figured out by an assessment based on the Decree of the Minister of Environment No. 115 of 2003. The results indicated that during the five years observation, there were land use changes in the upper, middle and lower part of Kali Madiun Sub-watershed. Several parameters increased in 2010 to 2015, namely: TDS, BOD, COD, nitrate, detergents, oils and greases. Pollution index shifted from slightly polluted in 2010 into moderately polluted in 2015. We propose a strategy to solve these problems by the involvement of stakeholders and the participation of local community in managing both domestic and industrial wastes. Also, it should be supported by palpable regulations related to land conversion. Furthermore, it is expected that the effort will reduce the potential of pollution and improve the water quality.

scholarly journals Hydrochemical appraisal of groundwater quality for drinking and irrigation: a case study in parts of southwest coast of Tamil Nadu, India

2021 ◽  
Vol 11 (3) ◽  
Author(s):  
Rajkumar Stanly ◽  
Srinivas Yasala ◽  
D. Hudson Oliver ◽  
Nithya. C. Nair ◽  
Karthikeyan Emperumal ◽  
...  
Keyword(s):  
Water Quality ◽  
Seawater Intrusion ◽  
Water Quality Index ◽  
Quality Index ◽  
Tamil Nadu ◽  
Marine Water ◽  
Vertical Electrical Sounding ◽  
Drinking And Irrigation ◽  
Subsurface Layers ◽  
Electrical Sounding

AbstractThe quality of groundwater standards in Muttom–Mandaikkadu coastal stretch is the focus of the present study, whose coastal aquifers are particularly at risk due to intrusion of marine water. Thirty groundwater samples were scrutinized for the assessment of physical and chemical parameters during January and June. Hydrochemical characteristics were spatially depicted to understand the spatial variations such as (pH, EC, TDS, Na+, K+, Ca2+ and Mg2+, SO42−, HCO3−, and Cl−). Drinking water quality index based on those 11 parameters and irrigation water quality index based on EC, Na%, sodium adsorption ratio and permeability index was used to assess the water quality for drinking and irrigation, respectively. These results demonstrate that dominant hydrochemical facies for groundwater in both months are Na-K-Cl-SO4 type and Ca-Mg-Cl-SO4 type. The USSL diagram endorses that most of the water samples belong to low-medium salinity with low sodium hazards. Cl−/HCO3− ratio indicates that the majority of the samples show low to moderate seawater intrusion in the study area. Additionally, six vertical electrical sounding measuring points (Schlumberger array) were carried out in order to determine the number of the underlying layers, aquifer depths and their thicknesses as well as its influence by the marine water. The geophysical self-potential measurements suggest that the groundwater in the Manavalakurichi area is prone to contamination by seawater intrusion, confirmed by the use of Schlumberger vertical electrical sounding. For better understanding, the subsurface layers were shown in a 2D model using the constructed geoelectrical cross section.

scholarly journals Aquatic ecosystem health assessment of a typical sub-basin of the Liao River based on entropy weights and a fuzzy comprehensive evaluation method

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Jiabo Chen ◽  
Yanjie Wang ◽  
Fayun Li ◽  
Zicheng Liu
Keyword(s):  
Water Pollution ◽  
Water Quality ◽  
Aquatic Ecosystem ◽  
Quality Index ◽  
Ecosystem Health ◽  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Fuzzy Comprehensive Evaluation ◽  
Fuzzy Comprehensive Evaluation Method ◽  
Comprehensive Evaluation Method

Abstract River ecosystem health assessments provide the foundation for river ecological protection and integrated management. To evaluate the aquatic ecosystem health of the Fan River basin, benthic macroinvertebrate indices (the Multimeric Macroinvertebrates Index Flanders (MMIF) and Family Biotic Index (FBI)), a habitat index (the river habitat quality Index (RHQI)) and a water quality index (the Improved Water Pollution Index (IWPI)) were selected. The entropy weighting method was used to calculate the RHQI and IWPI. A fuzzy comprehensive evaluation method was used to evaluate the aquatic ecosystem health. The evaluation results indicated that the aquatic ecosystem health of the Fan River basin was better in 2018 than in 2011, which respectively belonged to the ends of the 11th and 12th Five-Year Plans of the Major Science and Technology Programs for Water Pollution Control and Treatment in China. The proportions of sampling stations with good, moderate and poor grades in 2011 were 50.0%, 40.0% and 10.0%, respectively, and in 2018, the proportions of stations with excellent, good and moderate grades were 20.0%, 50.0% and 30.0%, respectively. A correlation analysis showed that the RHQI was significantly correlated with the MMIF, FBI and IWPI. The riparian land use pattern was an important factor that influenced changes in the aquatic ecosystem health grade. Of the water quality parameters, total phosphorous (TP) and potassium bichromate index (COD) were the main factors that affected the characteristics of benthic macroinvertebrates and the aquatic ecosystem health.

scholarly journals PENENTUAN PARAMETER KUNCI KUALITAS AIR SUNGAI BEDADUNG KABUPATEN JEMBER MENGGUNAKAN WATER QUALITY INDEX (Key determination of water quality parameter in Bedadung River, Jember Regency using water quality index method)

2021 ◽  
Vol 5 (1) ◽  
pp. 69-88
Author(s):  
Elida Novita ◽  
◽  
Satria Priambada Dwija Kusuma ◽  
Hendra Andiananta Pradana ◽  
Keyword(s):  
Water Quality ◽  
Discriminant Analysis ◽  
Urban Area ◽  
Water Quality Index ◽  
Quality Index ◽  
Cobalt Sulfide ◽  
Water Quality Parameter ◽  
Current Season ◽  
Water Quality Status ◽  
Quality Status

Determinion function of key parameters of water quality representing many parameters can be used to determine the water quality status . The purpose of the study were to analyse water quality status using Water Quality Index from Ministry of Environment of Mongolia and to select key parameter of water quality with discriminant analysis at Bedadung River. This research used 25 parameters (physicochemical and microbiology) were taken from 5 water sampling location at the period of 2016 to 2019. Location of water quality sampling were in urban area i.e. Patrang, Sumbesari, and Kaliwates Sub-district. The results showed that the water quality status calculation of the Bedadung River in urban area segment was 0.70 - 2.00 in clean and lightly - moderately polluted category. The key parameters from discriminant analysis were TSS, cobalt, sulfide, and chlorine. The most polluted parameters were sulfide and chlorine. The source of chlorine and sulfide pollution in Bedadung River were solid waste domestic exposure. Recommendation to reduce the level of contamination caused by garbage is development of small dam to facilitate the cleaning of garbage on the current season drought and education of the public to not throw garbage or waste in the Bedadung River.

scholarly journals Comparison of prediction model using spatial discriminant analysis for marine water quality index in mangrove estuarine zones

2019 ◽  
Vol 141 ◽  
pp. 472-481 ◽  
Author(s):  
Mohd Saiful Samsudin ◽  
Azman Azid ◽  
Saiful Iskandar Khalit ◽  
Muhamad Shirwan Abdullah Sani ◽  
Fathurrahman Lananan
Keyword(s):  
Water Quality ◽  
Discriminant Analysis ◽  
Prediction Model ◽  
Water Quality Index ◽  
Quality Index ◽  
Marine Water

scholarly journals Study on Marine Water Quality Parameters in Keluang Kecil River Estuary at Bukit Keluang, Terengganu

2021 ◽  
Vol 12 (1S) ◽  
pp. 140-149
Author(s):  
Nur Adiela Mohd Nasir ◽  
Nadzifah Yaakub
Keyword(s):  
Water Quality ◽  
Water Quality Index ◽  
Quality Index ◽  
River Estuary ◽  
Quality Parameters ◽  
Marine Water ◽  
Water Quality Status ◽  
River Estuarine ◽  
Quality Status

This study presents marine water quality status of river estuarine in Keluang Kecil River Estuary at Bukit Keluang. River estuarine water is classified in Class E in MWQI. In the subsequent MWQI with 0 to 100 scales, marine water quality at 0 will be described as “Poor” and 100 as “Excellent”. This study aims to determine water quality parameters and the water quality status of river estuarine by using Malaysia Marine Water Quality Index (MMWQI). In-situ and ex-situ analyses in this study were conducted for five sampling points that had been selected in the Keluang Kecil river estuary. In-situ parameters, dissolved oxygen (DO), pH, temperature, salinity and ammonia, were measured using YSI Professional Plus Series Multi-parameter during sampling. At the same time, water samples for total suspended solids, phosphate, nitrate and faecal coliform were collected and analysed in the laboratory using a standard procedure based on American Public Health Association (APHA), 2017 and HACH methods and then were compared with the Malaysia Marine Water Quality Standard (MMWQS). The average value of ammonia, nitrate, phosphate and TSS were not within the acceptable limit or standard value set by Department of Environment (DOE) except for dissolved oxygen and faecal coliform. Based on the one-way analysis of variance (ANOVA) result, there are significant differences (P < 0.05) in DO, pH, temperature, salinity, ammonia, TSS and FC in water between stations except for nitrate and phosphate. Marine Water Quality Index (MWQI) was measured for all the sampling stations (S1, S2, S3, S4 and S5) using a formula set by DOE (2019). The mean of MWQI for the Keluang Kecil river estuary measured was 43.45. Thus, the river estuary is classified as Poor (0 – 49). This study can maintain the marine water quality to conserve estuary biodiversity. This study was needed to prevent the possibility of water pollution and water quality can be monitored in that area in the future. The understanding of this study about water quality is to maintain the water quality and facilitate the management as actions can be taken by local authorities and other government agencies to maintain and improve the water quality and create boundaries and regulations that can bring back nature.

Formulation and Testing of a New Water Quality Index

1977 ◽  
Vol 12 (1) ◽  
pp. 101-120
Author(s):  
B. Ibbotson ◽  
B.J. Adams
Keyword(s):  
Water Quality ◽  
Water Quality Index ◽  
Quality Index ◽  
Water Quality Management ◽  
Quality Data ◽  
Water Quality Parameter ◽  
Expert Assessment ◽  
Specific Situation ◽  
Water Quality Data ◽  
Environmental Indices

Abstract The necessity of protecting our environment has promoted the development of new ways to communicate environmental information to both policy makers and the general public. In response to an increased interest in environmental indices, this paper forwards a new formulation which translates water quality parameter values into simple numerical results which can then be summed to give water quality index scores. The mechanism uses the matrix format to organize and display results with water quality parameters on one axis and common water activities on the other. The mechanism's task is then to assess the suitability of each parameter to each activity, and subsequently, to render the results into simple scores. The index can be applied to any situation in which water quality is a consideration. Its applicability lies in its offering to the perspective user the opportunity to calibrate the index to the needs of a specific situation. The procedure offers a systematic approach that is highly flexible and that generates results which are easily understood. The principal reasons for developing this index mechanism are to enable presentation of a simplified measure of water quality and to augment expert assessment of raw water quality data, not to supplant this important aspect of water quality management.

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