Using grey clustering to evaluate nitrogen pollution in estuaries with limited data.

08:00 EDT 14th March 2020 | BioPortfolio

Summary of "Using grey clustering to evaluate nitrogen pollution in estuaries with limited data."

Many techniques exist for the evaluation of nutrient pollution, but most of them require large amounts of data and are difficult to implement in countries where accurate water quality information is not available. New methods to manage subjectivity, inaccuracy or variability are required in such environments so that water managers can invest the scarce economic resources available to restore the most vulnerable areas. We propose a new methodology based on grey clustering which classifies monitoring sites according to their need for nitrogen pollution management when only small amounts of data are available. Grey clustering focuses on the extraction of information with small samples, allowing management decision making with limited data. We applied the entropy-weight method, based on the concept of information entropy, to determine the clustering weight of each criterion used for classification. In order to reference the pollution level to the anthropogenic pressure, we developed two grey indexes: the Grey Nitrogen Management Priority index (GNMP index) to evaluate the relative need for nitrogen pollution management based on a spatiotemporal analysis of total nitrogen concentrations, and the Grey Land Use Pollution index (GLUP index), which evaluates the anthropogenic pressures of nitrogen pollution based on land use. Both indexes were then confronted to validate the classification. We applied the developed methodology to eight estuaries of the Southern Gulf of Mexico associated to beaches, mangroves and other coastal ecosystems which may be threatened by the presence of nitrogen pollution. The application of the new method has proved to be a powerful tool for decision making when data availability and reliability are limited. This method could also be applied to assess other pollutants.


Journal Details

This article was published in the following journal.

Name: The Science of the total environment
ISSN: 1879-1026
Pages: 137964


DeepDyve research library

PubMed Articles [12168 Associated PubMed Articles listed on BioPortfolio]

Microplastics in the surface water of small-scale estuaries in Shanghai.

This study involved an assessment of the levels of microplastic pollution in seven small-scale estuaries in Shanghai for the first time. The abundance of microplastics ranged from 13.53 ± 4.6 to ...

Synovitis in rheumatoid arthritis detected by grey scale ultrasound predicts the development of erosions over the next three years.

To evaluate grey scale US (GSUS) and power Doppler US synovitis (PDUS), separately or in combination (CombUS), to predict joint damage progression in RA.

Exposure to air pollution during childhood and risk of developing schizophrenia: a national cohort study.

Ambient air pollution affects neurological function, but its association with schizophrenia risk is unclear. We investigated exposure to nitrogen oxides (NO) as a whole and nitrogen dioxide (NO) speci...

Ensemble clustering for step data via binning.

This paper considers the clustering problem of physical step count data recorded on wearable devices. Clustering step data gives an insight into an individual's activity status and further provides th...

Bacterial community structure and response to nitrogen amendments in Lake Shenandoah (VA, USA).

Microbial processes are critical to the function of freshwater ecosystems, yet we still do not fully understand the factors that shape freshwater microbial communities. Furthermore, freshwater ecosyst...

Clinical Trials [431 Associated Clinical Trials listed on BioPortfolio]

The Cardiovascular Effects of Nitrogen Dioxide Exposure

Exposure to air pollution has been linked to increased cardiorespiratory morbidity and mortality. The exact component of air pollution that mediates this effect is unknown, but the link is...

Cryogenic Preservation of Spermatozoa

The reference technique for the conservation of gametes is storage in liquid nitrogen but new vats of nitrogen vapor (storage over liquid nitrogen) or in dry phase (storage in an insulated...

Behavioral Research of Environment and Air Pollution Through Education

The BREATHE (Behavioral Research of Environment and Air Pollution Through Education) study is a pilot randomized control trial comparing the efficacy of a classroom-based intervention to n...

Impact of Pollution on Allergic Rhinitis and Sleep Quality: the POLLAR Study

It has been demonstrated that allergic rhinitis (AR) reduces sleep quality by some components such as nasal obstruction. Pollution and allergen exposure worsening AR, sleep quality is dete...

Clustering Among the Clinical Profiles of Patients With Pectus Excavatum

The primary objective of this study is to describe the relative distances between patient clinical profiles (i.e. patient clustering) in multivariate space.

Medical and Biotech [MESH] Definitions

Cortical malformations characterized by grey matter-lined cleft or cyst that extends from the EPENDYMA often to the PIA MATER outer surface. The grey matter that lines the cleft is often POLYMICROGYRIA. It is associated with developmental delay, motor disturbance and seizures.

A partially enclosed body of water, and its surrounding coastal habitats, where saltwater from the ocean mixes with fresh water from rivers or streams. The resulting mixture of seawater and fresh water is called brackish water and its salinity can range from 0.5 to 35 ppt. (accessed

Stable nitrogen atoms that have the same atomic number as the element nitrogen, but differ in atomic weight. N-15 is a stable nitrogen isotope.

The enrichment of a terrestrial or aquatic ECOSYSTEM by the addition of nutrients, especially nitrogen and phosphorus, that results in a superabundant growth of plants, ALGAE, or other primary producers. It can be a natural process or result from human activity such as agriculture runoff or sewage pollution. In aquatic ecosystems, an increase in the algae population is termed an algal bloom.

The process in certain BACTERIA; FUNGI; and CYANOBACTERIA converting free atmospheric NITROGEN to biologically usable forms of nitrogen, such as AMMONIA; NITRATES; and amino compounds.

Quick Search

DeepDyve research library

Searches Linking to this Article