Temat: hierarchical analysis - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Application of Multivariate Statistical Methods to the Hydrochemical Study of Groundwater Quality in the Sahel Watershed, Algeria
Autorzy:: Hakim, Djafer Khodja
Amina, Aichour
Amina, Rezig
Djouhra, Baloul
Ahmed, Ferhati
Powiązania:: https://bibliotekanauki.pl/articles/2173331.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: hydrochemical analysis
water quality
groundwater
principal component analysis
hierarchical cluster analysis
Sahel watershed
Opis:: The quality of groundwater is characterized by several numbers of physical and chemical parameters, which determine the use of water (water supply, irrigation, industry). This search paper is a contribution made to know the hydrochemical characteristics of groundwater in the Sahel sub-catchment which belongs to the large Soummam North basin of Algeria. Different multivariate statistical techniques were used such as principal component analysis (PCA), Hierarchical Cluster Analysis (HCA) and Diagram Analysis. These analyses are exercised to a dataset formed from 37 boreholes with 12 chemical variables over the entire surface of the watershed. The samples were collected in 2016. The 37 boreholes are one of the main water resources that supply the wilaya of Bouira with drinking water and irrigation. The analysis of water quality using different methods (ACP, HCA and Diagram) resulted in two chemical kinds: (Chloride, calcium sulfate and magnesium), and (Bicarbonate calcium and magnesium). The results have shown that 74% of the boreholes were contaminated, the rest of boreholes were characterized by a good quality and they have not suffered any contamination and can be consumed without any risk.
Źródło:: Journal of Ecological Engineering; 2022, 23, 8; 341--349
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Use of Multivariate Statistical Analysis of Hydrochemical Data for the Identification of the Geochemical Processes in the Tirana-Fushe Kuqe Alluvial Aquifer, North-Western Albania
Autorzy:: Raço, Endri
Beqiraj, Arjan
Cenameri, Sabina
Jahja, Aurela
Powiązania:: https://bibliotekanauki.pl/articles/2173334.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: Tirana-Fushe Kuqe aquifer
groundwater
multivariate analysis
principal component analysis
hierarchical cluster analysis
Opis:: During the research, 71 groundwater samples were collected over a 300 km2 area of Tirana-Fushe Kuqe alluvial aquifer extension (central-western Albania) and subsequently analyzed for 11 parameters (pH, K+, Na+, Ca2+, Mg2+, HCO3-, Cl-, SO42-, NO3-, TH and TDS). Both geochemical conventional (Piper and Chadha diagrams) methods of groundwater classification and multivariate statistical (principal components analysis – PCA and hierarchical cluster analysis – HCA) methods were applied to the dataset to evidence the geochemical processes controlling groundwater geochemistry evaluation through the aquifer. The conventional geochemical methods revealed four (G1–G4) hydrochemical groups where the dominant group is G2 the samples of which are from unconfined to semiconfined recharge zone and the majority of them have Ca-Mg-HCO3 groundwater. Group G3 includes the samples from the confined coastal aquifer having Na-Cl groundwater. Group G1 includes three groundwater samples of Ca-Mg-SO4 from the central part of the aquifer, while group G4, the samples of which are spatially located between G3 and G2 zones, has Na-HCO3 groundwater. The first four components of the PCA account for 85.35% of the total variance. Component PC1 is characterized by very high positive loadings of TH, Ca2+, and Mg2+, suggesting the importance of dissolution processes in the aquifer recharge zone. Component PC2 is characterized by very high positive loadings in Na+, K+, and Cl-and moderate to high loadings of TDS, revealing the involvement of seawater intrusion and diffusion from clay layers. On the basis of their variable loadings, the first two components are defined as the “hardness” and “salinity”, respectively. The HCA produced four geochemically distinct clusters, C1–C4. The samples of cluster C1 are from the coastal confined aquifer and their groundwater belongs to the Na-Cl type. The samples from cluster C2 are located in the south and east recharge areas and most of them have Ca–Mg–HCO3 groundwater, while the samples from cluster C3, which are located in the northeastern recharge zone, have Mg-Ca–HCO3 groundwater. Finally, cluster C4 includes two groundwater subgroups having Na-Cl-HCO3 and Na-Mg-Cl-HCO3 groundwater in the vicinity of cluster C1 as well as Na-HCO3-Cl and Na-Mg-HCO3-Cl groundwater next to cluster C2 and C3.
Źródło:: Journal of Ecological Engineering; 2022, 23, 8; 327--340
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Porównanie oddziaływania na środowisko różnych metod technologii unieszkodliwiania odpadów wydobywczych z wykorzystaniem metody AHP
Comparison of the environmental impact of different methods of mining waste disposal technology using AHP method
Autorzy:: Kubicz, J.
Hämmerling, M.
Walczak, N.
Powiązania:: https://bibliotekanauki.pl/articles/401094.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: hierarchiczna analiza problemu
odpady poflotacyjne
oddziaływanie na środowisko
zbiornik
hierarchical problem analysis
flotation tailings
environmental impact
tailing pond
Opis:: Eksploatacja składowisk wszelkiego rodzaju odpadów niesie za sobą różnego rodzaju problemy dotyczące m. in. ich unieszkodliwiania oraz wpływu zgromadzonych zanieczyszczeń na środowisko naturalne. Na składowiskach gromadzone mogą być odpady np. poflotacyjne z zakładów wzbogacania rudy. Pomimo stosowania przez firmy/koncerny najnowocześniejszych metod wydobycia i przetwarzania rud miedzi oraz wprowadzenia nowoczesnych systemów organizacji i zarządzania produkcją obszar zlokalizowany najbliżej zbiornika jest narażony na jego działanie. Wiele rodzajów odpadów stanowi cenne źródło surowców wtórnych, które nadają się do wykorzystania przez różne gałęzie przemysłu. Przykładem takich surowców są odpady górnicze (poflotacyjne), zazwyczaj obojętne środowisku, których wytwarzana ilość w procesie eksploatacji kopalin jest znaczna. W artykule porównano różne metody technologiczne składowania odpadów wydobywczych z wykorzystaniem metody AHP i ich wpływ na środowisko.
Exploitation of tailing ponds sites for storing all types of waste materials creates multiple problems concerning waste disposal and the environmental impact of the waste. Tailing ponds waste may comprise e.g. flotation tailings from ore enrichment plants. Despite the fact that companies / corporations use state-of-the-art methods of extraction and processing of copper ore, and introduce modern systems of organization and production management, the area located closest to the reservoir is exposed to its negative effects. Many types of waste material are a valuable source of secondary raw materials which are suitable for use by various industries. Examples of such materials are mining waste (flotation tailings), usually neutral to the environment, whose quantities produced in the process of exploitation of minerals is sizeable. The article compares different technological methods of mining waste disposal using AHP method and their environmental impact.
Źródło:: Inżynieria Ekologiczna; 2016, 47; 131-136
2081-139X
2392-0629
Pojawia się w:: Inżynieria Ekologiczna
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Multivariate Statistical Analysis of Groundwater Quality of Hassi Rmel, Algeria
Autorzy:: Mehdi, Metaiche
Hakim, Djafer Khodja
Amina, Aichour
Nourredine, Gaci
Powiązania:: https://bibliotekanauki.pl/articles/24201762.pdf
Data publikacji:: 2023
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: groundwater
water quality
principal component analysis
PCA
ascending hierarchical classification
HAC
diagram analysis
Hassi R'mel region
Opis:: The quality of Groundwater is characterized by physico-chemical parameters. They determine the way in which this water is used (water supply, irrigation, industry, etc.). This present study gives the highlighting of the hydrogeological and physico-chemical characteristics of aquifer waters in question resulting from the various wells, which aims to; gather, exploit and analyze the data, in order to determine their conformity with potability standards and their suitability for irrigation. Using multivariate statistical techniques including Principal Component Analysis (PCA), Hierarchical Cluster Analysis (ACH) and Diagram Analysis. They are applied to a dataset composed of 17 boreholes with 12 chemical variables over the entire study area, they were sampled in 2020. These boreholes are the principal water resources suppling Hassi R'mel w. Laghouat region in terms of drinking water and irrigation. Obtained results showed that the majority of groundwater in the Hassi R’mel region is hard; where approximately 20% of boreholes are characterized by fairly soft water, and approximately 5% are characterized by very hard water.
Źródło:: Journal of Ecological Engineering; 2023, 24, 5; 22--31
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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