The performance of diatom indices in assessing temporal changes in water quality in a large lowland river ecosystem

2020 ◽  
Author(s):  
Xiang Tan ◽  
Yan Liu ◽  
Michele A. Burford ◽  
Quanfa Zhang
Keyword(s):  
Water Quality ◽  
Temporal Changes ◽  
Lowland River ◽  
River Ecosystem ◽  
Diatom Indices

Potash mining mountain waste and its contribution to river water salinisation: the case of the Llobregat River, Catalonia, Spain

2021 ◽  
Author(s):  
Joaquim Farguell
Keyword(s):  
Water Quality ◽  
Electrical Conductivity ◽  
River Water ◽  
Water Quality Monitoring ◽  
Mining Activities ◽  
River Ecosystem ◽  
Rainfall Events ◽  
Potash Salt ◽  
Short Period ◽  
Llobregat River

<p>It is well known that mining activities have negative effects on fluvial ecosystems. Such activities alter the water quality by introducing heavy metals and associated pollutants and alter the sediment regime by creating a point source sediment that may affect the entire basin. </p><p>In the Llobregat River, a medium Mediterranean river basin (ca. 5000 km<sup>2</sup>), potash salt mining activities have been undertaken for several decades. Salinisation of surface river water has become an environmental issue of great concern for the water administrators given that the water of this river supplies half of the population of the metropolitan area of Barcelona (ca. 2,500,000 inhabitants) and it is also used for irrigation in the lowermost part of the river and its delta.</p><p>This study aims to describe the magnitude of the dissolved solids inputs that are detected in the river surface water after rainfall events by means of continuous electrical conductivity monitoring. Electrical conductivity records (EC) were obtained from an automatic water quality monitoring station set by the Water Catalan Authorities and located 3 km downstream from the potash mountain waste.  The study also tries to predict the EC peak according to different hydrometeorological parameters selected from the episodes recorded.</p><p>Data analysed was continuously recorded at 15-minute interval between January 1st, 2018 and September 30th, 2020 and a total of 74 EC episodes were considered. Mean EC of the episodes recorded was 3,488 µS/cm, with a standard deviation of 3,638 µS/cm, and a coefficient of variation of 104.3%. The median was 2,390 µS/cm. Data obtained show that after rainfall events a peak of electrical conductivity in the river is detected. However, it exhibits a high variability in its magnitude, ranging from 939 µS/cm up to 26,900 µS/cm. Despite this, the coefficients of determination of the regression lines between the meteorological variables, such as rainfall intensity or total rainfall amount, and the peak EC exhibit poor correlations (R<sup>2</sup>=0.355 and R<sup>2</sup>=0.229, respectively), although they are significant.</p><p>Results indicate that washload processes in the salt mountain waste take place and reach the river producing extremely high EC peak values during a short period of time. Such values can have harmful effects on the river ecosystem and affect the lowerland river area, where water is diverted for potabilization and irrigation purposes. However, the low correlation between rainfall and EC peak indicates that additional variables intervene in the rainfall-runoff processes and further research is required to fully understand the connectivity and transmission of the salt moutain waste into the river. Understanding such processes and analyasing the consequences on the fluvial system, will probably be the way to tackle the restoration of this enormous impact on this river ecosystem.</p>

scholarly journals Assessment of water quality based on diatom indices in a small temperate river system, Kowie River, South Africa

Water SA ◽  
2016 ◽  
Vol 42 (2) ◽  
pp. 183
Author(s):  
Tatenda Dalu ◽  
Taurai Bere ◽  
P William Froneman
Keyword(s):  
South Africa ◽  
Water Quality ◽  
River System ◽  
Diatom Indices ◽  
Temperate River

Temporal changes in the water quality of urban tropical streams: an approach to daily variation in seasonality

2021 ◽  
Author(s):  
João Miguel Merces Bega ◽  
José Antônio Zanetoni Filho ◽  
Liliane Lazzari Albertin ◽  
Jefferson Nascimento de Oliveira
Keyword(s):  
Water Quality ◽  
Daily Variation ◽  
Temporal Changes ◽  
Tropical Streams

Water quality of the River Vantaanjoki (South Finland) described using diatom indices

2000 ◽  
Vol 27 (5) ◽  
pp. 2709-2713
Author(s):  
Pertti Eloranta ◽  
Janina Kwandrans
Keyword(s):  
Water Quality ◽  
Diatom Indices

scholarly journals Inventarisasi dan Komposisi Jenis Ektoparasit Ikan Nila (Oreochromis niloticus) Sebagai Biomonitoring Perairan Sungai Tukad Badung, Bali

2018 ◽  
Vol 5 (1) ◽  
pp. 89
Author(s):  
Alfi Hermawati Waskita Sari ◽  
Rani Ekawaty
Keyword(s):  
Water Quality ◽  
Ecosystem Management ◽  
Oreochromis Niloticus ◽  
Parasite Species ◽  
Environmental Stressors ◽  
River Ecosystem ◽  
River Waters ◽  
Anthropogenic Wastes

Environmental stressors which coming from anthropogenic wastes that indirectly enters into the river waters also affect the biota's health in the ecosystem such as the Tilapia Fish (Oreochromis niloticus) which is found in the waters of the Tukad Badung River, Bali. The presence of parasites in fish is also associated with changes of the water quality. The objectives of this study is to provide data and information on the inventory and composition of the parasite species in Tilapia fish (Oreochromis niloticus) as the aquatic health biomonitoring of in the effort of sustainable river ecosystem management. The results of ectoparasit observation of the Tilapia which obtained from five stations in Tukad Badung waters found 6 types of ectoparasites, which are Trichodina sp. Dactylogyrus sp. Gyrodactylus sp., Chilodonella sp., Vorticella sp. and Lernea sp. The composition of the ectoparasite species of nila tilapia fish (Oreochromis niloticus) obtained from all five research stations in Tukad Badung waters by percentage of presence of ectoparasite Trichodina sp. are 70%, Dactylogyrus sp. 31%, Gyrodactylus sp. 4% and Chilodonella sp., Vorticella sp. and Lernea sp.  1%.

Grey Correlation Model Based on Diatom Indices Evaluating Water Quality of Longjiang River

2013 ◽  
Vol 448-453 ◽  
pp. 43-47 ◽  
Author(s):  
Xin Tang ◽  
De Suo Cai ◽  
Wen Ting Yao
Keyword(s):  
Water Quality ◽  
Water Quality Assessment ◽  
Quality Standard ◽  
Relational Model ◽  
Water Quality Standard ◽  
Diatom Index ◽  
Model Based ◽  
Diatom Indices ◽  
Grey Relational

In order to evaluate the water quality of Longjiang river comprehensively, diatoms of 15 sampling sites are collected to establish the Grey Relational Model based on three diatom indexesIPS, IBD and IDG. From the Cluster analysis of sampling sites and the box plot of diatom index, IBD is the best, then the IPS, the diatom index weights on water quality assessment are 0.637 for IBD, 0.2583 for IPS, 0.1074 for IDG respectively. Finally, by comparing the water quality standard level based on Grey Relational Model, it can be known that the water quality of most sampling sites is fine except that site No.1 and No.3 belong to III water quality standard. The result shows that it is more comprehensive and reasonable to use the Grey Relational Model based on diatom index rather than individual diatom index to assess water quality.

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