Journal ArticleDOI
Application of two-stage fuzzy set theory to river quality evaluation in Taiwan
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TLDR
An indicator model for evaluating trends in river quality using a two-stage fuzzy set theory to condense efficiently monitoring data is proposed and provides a more sensitive indication of changes in quality than the RPI.About:
This article is published in Water Research.The article was published on 2003-03-01. It has received 118 citations till now. The article focuses on the topics: Fuzzy set & Membership function.read more
Citations
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Use of the water quality index and dissolved oxygen deficit as simple indicators of watersheds pollution
Enrique Sánchez,M.F. Colmenarejo,Juan Vicente,Angel Rubio,Maria Guadalupe Garcia,L. Travieso,Rafael Borja +6 more
TL;DR: In this paper, the use of water quality index (WQI) and the dissolved oxygen deficit (D) as simple indicators of watersheds pollution was investigated and compared in the Municipality of Las Rozas (north-west of Madrid, Spain).
Journal ArticleDOI
A generalized water quality index for Taiwan.
TL;DR: A new, mixed aggregation function is developed for ensuring that the index score tells us something useful and does not hide important information, than the existing index used in Taiwan does.
Journal ArticleDOI
A survey on river water quality modelling using artificial intelligence models: 2000–2020
TL;DR: Overall, this survey provides a new milestone in water resource engineering on the AI model implementation, innovation and transformation in surface WQ modelling with many formidable problems in different blossoming area and objectives to be achieved in the future.
Journal ArticleDOI
Fuzzy evaluation of water quality classification
TL;DR: In this article, an index model for quality evaluation of surface water quality classification using fuzzy logic is proposed, in which traditional quality classes are transformed into continuous form and then the concentration values of the different quality parameters are summed using fuzzy rules, finally, defuzzyfication of this summed values develops the index.
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Trend study and assessment of surface water quality in the Ebro River (Spain)
TL;DR: In this article, a trend study was performed using the Mann-Kendall Seasonal Test and the Sen′s slope estimator to identify the sources of variation in the Spanish Ebro River.
References
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Book
Fuzzy sets
TL;DR: A separation theorem for convex fuzzy sets is proved without requiring that the fuzzy sets be disjoint.
Journal ArticleDOI
Assessment of seasonal and polluting effects on the quality of river water by exploratory data analysis
TL;DR: In this article, an ANOVA of the rotated principal components has demonstrated that mineral contents are seasonal and climate dependent, thus pointing to a natural origin for this polluting form and pollution by organic matter and nutrients originates from anthropogenic sources, mainly as municipal wastewater.
Journal ArticleDOI
Temporal evolution of groundwater composition in an alluvial aquifer (Pisuerga river, Spain) by Principal Component Analysis.
Beatriz A. Helena,Beatriz A. Helena,Rafael Pardo,Marisol Vega,Enrique Barrado,J.M.F. Fernández,Luis E. Fernandez +6 more
TL;DR: A set of quantitative analytical data from the alluvial aquifer of the Pisuerga river, located at the north-east of Valladolid (Spain), has been processed by multivariate statistical techniques in order to investigate the evolution of the groundwater composition between two surveys as mentioned in this paper.
Journal ArticleDOI
A Convergence Theorem for the Fuzzy ISODATA Clustering Algorithms
TL;DR: The theory of Zangwill is used to prove that arbitrary sequences generated by these (Picard iteration) procedures always terminates at a local minimum, or at worst, always contains a subsequence which converges to aLocal minimum of the generalized least squares objective functional which defines the problem.
Book
Environmental indicators : a systematic approach to measuring and reporting on environmental policy performance in the context of sustainable development
TL;DR: Hammond and Adriaanse as discussed by the authors presented a systematic approach to measuring and reporting on environmental policy performance in the context of sustainable development, which was reviewed by the SCOPE project and provided background for an international policy meeting on sustainable development hosted by the Belgium and Costa Rican governments.