Global Journal of Human-Social Science, B: Geography, Environmental Science and Disaster Management, Volume 22 Issue 3

In the third and last cut-off point, group A again remained homogeneous. Because group B-1 was composed only of soil 03IT-NA', it also had no alterations (and will not have). group B-2, however, was subdivided into two subgroups (B-2-a and B-2-b), whose division may have been carried out as a function of the organic matter content found in the soils, as shown in Figure 6 (B-2-a: O.M. between 4.37 – 5.53 g/kg; B-2-b: 5.68 – 6.67 g/kg), but may also be associated with the behavior of several other variables that, despite presenting a certain "overlap" of values between groups tend, to present lower or higher results such as: ε p - B-2-a: between 1.63 – 7.19 mm; B-2-b: 0.78 – 3.37 mm; ψ b1 - B-2-a: between 3.4 – 4.8 kPa; B-2- b: 1.2 – 3.8 kPa. Figure 6: Division of groups B-2-a and B-2-b considering the organic matter content of the soils of this research The final interpretation of the group allows the division of the studied soils into four different clusters (C-1 to C4) in the dendrogram, cluster 1 (C-1) composed of 4 soils of group A (01GO-LG', 02AR-LG', 07SL-NA' and 08RE-LA'), Cluster 2 (C-2) composed of the soil of group B-1 (03IT-NA'), Cluster 3 (C-3) formed by 4 soils of subgroup B-2-a (04IG-LG', 05PA-LA', 06CA-LA' and 13IP-LA') and Cluster 4 (C-4) composed of 4 soils of subgroup B-2-b (09MG-LA', 10MU-LA', 11CB-LA' and 12SULG'). From each cluster, greater similarities were identified between some pairs of soils, namely: c-1 - 07SL-NA' and 08RE-LA', C-3 - 04IG-LG' and 13IP-LA' and C-4 - 10MU-LA' and 11CB-LA'. Soils 07SL-NA' and 08RE-LA', despite being of different MCT classes, are of identical USCS class and have similar values of liquidity limit, %clay, pH KCl , δ , ε p and S b . Soils 04IG-LG' and 13IP-LA', though also of different MCT classes, are of the same TRB class (A-6) and have analogous values of PI, optimum moisture, K2TC, K2TD, ε p , Ư b1 and S res1 . The soils 10MU-LA' and 11CB-LA' are of the same MCT class with similar values of c', e', % silt, PI, ε p and Ψ res1 . It was also observed that the classification of aluminum saturation indicated by Prezotti (2013) may also be related to general soil grouping, since only one soil in each saturation class (low, medium and high) is distant from the formed group, which is certainly due to the other variables considered. c) Stereo Miscroscope Image Comparison Figures 7, 8 and 9 present the images that are most similar to the images of the 04IG-LG', 08RE-LA' and 12SU-LG' samples, respectively (a sample of each cluster obtained in the hierarchical cluster, with the exception of the cluster composed of the sample 03IT- NA because it is a group with a single element). The numbers presented next to each ranked image refers to the Euclidean distance in relation to the reference image. The soils with color distribution most similar to soil 04IG-LG' are soils 07SL-NA', 13IP-LA', 11CB-LA', 10MU-LA' and 03IT-NA', and it is noted that, with the exception of sample 07SL-NA', the indicated soils are part of the same large hierarchical group (B) and, in addition, the 13IP-LA' soil coincides with the soil closest to 04IG-LG' in cluster C3/B-2-a. Visual similarity regarding the predominance of quartz particles is noted. Volume XXII Issue III Version I 20 ( ) Global Journal of Human Social Science - Year 2022 © 2022 Global Journals B Clustering of Fine-Grained Tropical Soils using Data Science Tools Applied to their Geotechnical Properties