Fig 1.
Sampling locations throughout the coastal belt of the Bay of Bengal (Southern region of Bangladesh).
Table 1.
Sampling site (longitude and latitude) in the coastal belt.
Fig 2.
Tidal river dynamics and implementation for deltas; (A) cross-section and (B) plan view [39, 40].
Fig 3.
(a). A cross-laminated estuary, (b) a partially laminated estuary, and (c) a well-mixed laminated estuary [41].
Table 2.
Suitability test of data for factor analysis of water samples.
Fig 4.
(a) Piper diagram and (b) Durov diagram.
Table 3.
Assessed parameters in river water with their descriptive statistics and the entropy water quality index (EWQI) calculation.
Fig 5.
a-j (i, ii, iii) The spatial distribution of the three seasons and their concentrations of HCO3- Ca2+, CO2, Cl-, PO43-, NO3-, Na+, K+, salinity, and TDS.
Fig 6.
Heat map of Pearson’s correlation matrix of the parameters for water samples.
Fig 7.
Principal component analysis of (a) cumulative % of loading factor for eigenvalues and component number, (b) scree plot of the eigenvalues and rotated space, and (c) PC1 versus PC2.
Table 4.
Principal component loadings and explained variances in water samples.
Fig 8.
The dendrogram was obtained from hierarchical clustering analysis for (a) assessed water quality parameters (distance vs. variables) and (b) sampling sites (distance vs variables).
Fig 9.
Classification of river water samples for irrigation purposes (after Wilcox 1948) in the coastal belt, Bangladesh.
Table 5.
Agriculture suitability evaluation [67].