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Table 3: Calculation of sediment discharge along the A-B and C-D sections of Kutubdia Channel Water discharge measured by ADCP along the A-B and C-D sections also. Along the A-B and C-D sections, the water discharge value is 679.19 and 146.41 cubic meter per second respectively. In the matter of ADCP operation during survey to measure water discharge, the north to southward direction of flow of channel water considered as positive (+) value and south to northward direction of flow considered as negative (-) value of discharge (Fig. 1). So, in the table, the negative sign of A-B section means bay to channel ward and positive sign

Table 3 Calculation of sediment discharge along the A-B and C-D sections of Kutubdia Channel Water discharge measured by ADCP along the A-B and C-D sections also. Along the A-B and C-D sections, the water discharge value is 679.19 and 146.41 cubic meter per second respectively. In the matter of ADCP operation during survey to measure water discharge, the north to southward direction of flow of channel water considered as positive (+) value and south to northward direction of flow considered as negative (-) value of discharge (Fig. 1). So, in the table, the negative sign of A-B section means bay to channel ward and positive sign

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So, this study deals available tools should be used for environmental purpose along with grain size-distribution. with the determination of sediment depositional processes as well as sedimentary environments using grain-size characteristics and sediment discharge of the Kutubdia Channel. The study area lies in the Kutubdia Channel of Cox’s Bazar district where it is surrounded by Kutubdia Island in the west, Pekua Upazila in the east, north and south is open to Bay of Bengal. The area is bounded by N 21.65 to N 21.92 latitudes and E 91.84 to E 91.92 longitudes (Fig.1). with the determination of sediment depositional processes as well as sedimentary
So, this study deals available tools should be used for environmental purpose along with grain size-distribution. with the determination of sediment depositional processes as well as sedimentary environments using grain-size characteristics and sediment discharge of the Kutubdia Channel. The study area lies in the Kutubdia Channel of Cox’s Bazar district where it is surrounded by Kutubdia Island in the west, Pekua Upazila in the east, north and south is open to Bay of Bengal. The area is bounded by N 21.65 to N 21.92 latitudes and E 91.84 to E 91.92 longitudes (Fig.1). with the determination of sediment depositional processes as well as sedimentary
Figure 2: Morphodynamic setting of the study area (modified from Majlis et al., 2013) The study area lies in the Folded Flank of Tectonic Structure which is located in the south- eastern part of Bangladesh (Khan, 2002). The axial trend of the regional structure may extend up to Kutubdia Island through middle of Matarbari Island (Majlis et al., 2013) (Fig. 2). Majlis et al. (2013) studied on the geology and geomorphology of the area. According to Majlis et al. (2013), Bangladesh's eastern coast's Moheshkhali and Kutubdia offshore islands are part of a complex and distinctive geological system (Fig. 2). Matarbari Island including surrounding area is undergoing gaining phase since 1972 where 47 sq. km area has been added in 38 years with 1.2 sq. km rate per year. Kutubdia Island is undergoing its loosing phase and eroding approximately 9 sq. km in las 38 years (Islam et al, 2011). Also, Majlis et al. (2013) mentioned that geologically the study area is mainly consisting of Holocene unconsolidated coastal deposits. Kutubdia and Matarbari islands are Matarbari Island including surrounding area is undergoing gaining phase since 1972 where 47 sq. km area has been added in 38 years with 1.2 sq. km rate per year. Kutubdia Island is
Figure 2: Morphodynamic setting of the study area (modified from Majlis et al., 2013) The study area lies in the Folded Flank of Tectonic Structure which is located in the south- eastern part of Bangladesh (Khan, 2002). The axial trend of the regional structure may extend up to Kutubdia Island through middle of Matarbari Island (Majlis et al., 2013) (Fig. 2). Majlis et al. (2013) studied on the geology and geomorphology of the area. According to Majlis et al. (2013), Bangladesh's eastern coast's Moheshkhali and Kutubdia offshore islands are part of a complex and distinctive geological system (Fig. 2). Matarbari Island including surrounding area is undergoing gaining phase since 1972 where 47 sq. km area has been added in 38 years with 1.2 sq. km rate per year. Kutubdia Island is undergoing its loosing phase and eroding approximately 9 sq. km in las 38 years (Islam et al, 2011). Also, Majlis et al. (2013) mentioned that geologically the study area is mainly consisting of Holocene unconsolidated coastal deposits. Kutubdia and Matarbari islands are Matarbari Island including surrounding area is undergoing gaining phase since 1972 where 47 sq. km area has been added in 38 years with 1.2 sq. km rate per year. Kutubdia Island is
Figure 3: Generalized (A) physiographic and (B) geological map of Kutubdia and surrounding islands (modified from Mojlis et al, 2013) coastal plain. coastal plain of Kutubdia, Matarbari, Moheshkhali and Sonadia Islands constitute the active
Figure 3: Generalized (A) physiographic and (B) geological map of Kutubdia and surrounding islands (modified from Mojlis et al, 2013) coastal plain. coastal plain of Kutubdia, Matarbari, Moheshkhali and Sonadia Islands constitute the active
Where @5, 216, 225, 250, 275, S@g4 and Sos represents 5th y6t 25%, 50%, 75%, 84% and 95% percentile, respectively, on the cumulative curve. At first sedimentary texture has been delineated using laboratory measurement. After field investigation, grain size distributions were measured by dry sieving methods. 100g of sediment samples taken to perform sieving method using ASTM standard sieve mesh no. such as 18, 35, 60, 120, and 230 to separate different sand size particles. 230 mesh (0.063mm size) used to separate silt and clay from sand size sediment in the sieve method. The equation given by Folk and Ward (1957) was used to calculate the statistical characteristics of grain- size distribution. The following equation was used to compute the graphic mean, standard deviation, skewness, and kurtosis from the cumulative graph values (610, 625, 60, 075, p99). deviation, skewness, and kurtosis from the cumulative graph values ($10, 625, 660, 675,
Where @5, 216, 225, 250, 275, S@g4 and Sos represents 5th y6t 25%, 50%, 75%, 84% and 95% percentile, respectively, on the cumulative curve. At first sedimentary texture has been delineated using laboratory measurement. After field investigation, grain size distributions were measured by dry sieving methods. 100g of sediment samples taken to perform sieving method using ASTM standard sieve mesh no. such as 18, 35, 60, 120, and 230 to separate different sand size particles. 230 mesh (0.063mm size) used to separate silt and clay from sand size sediment in the sieve method. The equation given by Folk and Ward (1957) was used to calculate the statistical characteristics of grain- size distribution. The following equation was used to compute the graphic mean, standard deviation, skewness, and kurtosis from the cumulative graph values (610, 625, 60, 075, p99). deviation, skewness, and kurtosis from the cumulative graph values ($10, 625, 660, 675,
the secchi depth value. High turbidity found in the K1, K2 and K3 sampling location which is
the secchi depth value. High turbidity found in the K1, K2 and K3 sampling location which is
discharge data and average TSS measured in the middle point of the sections. From ADCP,
discharge data and average TSS measured in the middle point of the sections. From ADCP,
Figure 9: Triangular diagram for textrual classification of sediment in the Kutubdia Channel (Shepard, 1954)
Figure 9: Triangular diagram for textrual classification of sediment in the Kutubdia Channel (Shepard, 1954)
b) Graphic statistical classification of sediment Frequency curve
b) Graphic statistical classification of sediment Frequency curve
Figure 10: Frequency curve based on sediment size and individual weight percentage of The Kutubdia Channel sediment is unimodal population. ii. Cumulative curve
Figure 10: Frequency curve based on sediment size and individual weight percentage of The Kutubdia Channel sediment is unimodal population. ii. Cumulative curve
Table 5: Statistical parameter of sediment texture of the area
Table 5: Statistical parameter of sediment texture of the area
Table 5 shows the calculated value of different grain size parameter such as graphic mean,
Table 5 shows the calculated value of different grain size parameter such as graphic mean,
Figure 12: Graphical plot of (a) mean size, (b) standard deviation, (c) skewness, and (d) kurtosis of the sediment
Figure 12: Graphical plot of (a) mean size, (b) standard deviation, (c) skewness, and (d) kurtosis of the sediment
Table 6: Shows the LDF value and associate depositional environment of the study area Discrimination Function (MDF) to find out distinguished environment for the sedimen
Table 6: Shows the LDF value and associate depositional environment of the study area Discrimination Function (MDF) to find out distinguished environment for the sedimen
Table 7: Shows the Multigroup Discrimination Function value of the sediment
Table 7: Shows the Multigroup Discrimination Function value of the sediment
Figure 13: Discrimination of depositional environment of the study area using V1-V2 plot after Sahu (1983) DISCUSSIONS Sediment Discharge:
Figure 13: Discrimination of depositional environment of the study area using V1-V2 plot after Sahu (1983) DISCUSSIONS Sediment Discharge:
Reineck and Singh, 1973; Shettima et al., 2012). Folk and Ward (1957), mentioned that The result of kurtosis showed in this paper as platykurtic which very low value ranges 0.83 to 0.87. Also, the sorting showed moderately well sorted nature of sediment indicates high energy depositional environment of the study area. Positive skewed indicate fine fraction abundant in the sediment (Baiyegunhi et al., 2017). As per Folk (1964), strongly skewed The result of kurtosis showed in this paper as platykurtic which very low value ranges 0.83 tc
Reineck and Singh, 1973; Shettima et al., 2012). Folk and Ward (1957), mentioned that The result of kurtosis showed in this paper as platykurtic which very low value ranges 0.83 to 0.87. Also, the sorting showed moderately well sorted nature of sediment indicates high energy depositional environment of the study area. Positive skewed indicate fine fraction abundant in the sediment (Baiyegunhi et al., 2017). As per Folk (1964), strongly skewed The result of kurtosis showed in this paper as platykurtic which very low value ranges 0.83 tc
The bivariate p sorting but me samples are be ot between standard deviation and mean size for sediment shows variations 0 an size is very fine sand (Fig. 12a). The sediment energy diagram shows ongs to wave process with some are indicate quite water process (Fig. 13a) The bivariate plot between skewness and mean size shows mostly fine skewed to strongl) between kurtos moderate size fine skewed indicates dominant of fine size fraction (Fig. 12b). Also, the bivariate plot show: wave process is dominant during sediment deposition in the area (Fig. 13b). Bivariate plo is and skewness shows fine skewed and mesokurtic to platykurtic indicate is dominant but fine tails are not prominent. The sorting and skewnes: bivariate plot show fine skewed and moderately well sorting. The bivariate plots indicate uniform and moderate energy of sediment deposition with prominent wave process in the channel. Figure 13: Energy process diagram of statistical parameter for the sediment samples between (a) mean size vs standard deviation (after Stewart, 1958; Moiola and Weiser, 1968), (b) mean size vs skewness (Stewart, 1958) uniform and moderate energy of sediment deposition with prominent wave process in the
The bivariate p sorting but me samples are be ot between standard deviation and mean size for sediment shows variations 0 an size is very fine sand (Fig. 12a). The sediment energy diagram shows ongs to wave process with some are indicate quite water process (Fig. 13a) The bivariate plot between skewness and mean size shows mostly fine skewed to strongl) between kurtos moderate size fine skewed indicates dominant of fine size fraction (Fig. 12b). Also, the bivariate plot show: wave process is dominant during sediment deposition in the area (Fig. 13b). Bivariate plo is and skewness shows fine skewed and mesokurtic to platykurtic indicate is dominant but fine tails are not prominent. The sorting and skewnes: bivariate plot show fine skewed and moderately well sorting. The bivariate plots indicate uniform and moderate energy of sediment deposition with prominent wave process in the channel. Figure 13: Energy process diagram of statistical parameter for the sediment samples between (a) mean size vs standard deviation (after Stewart, 1958; Moiola and Weiser, 1968), (b) mean size vs skewness (Stewart, 1958) uniform and moderate energy of sediment deposition with prominent wave process in the
Figure 14: Cumulative weight percentage probability curve (Visher diagram) of the Kutubdia Channel population settings indicate wave zone of sediment process (Fig. 14). Visher (1969) indicated that three sand population curves are associated with wave zones anc
Figure 14: Cumulative weight percentage probability curve (Visher diagram) of the Kutubdia Channel population settings indicate wave zone of sediment process (Fig. 14). Visher (1969) indicated that three sand population curves are associated with wave zones anc
Figure 15: Bivariate plot between (a) Y1 vs Y2, (b) Y2 vs Y3, (c) Y3 vs Y4 marine and deltaic or lacustrine environment of sediment deposition (Fig. 13). The deltaic environment shows for two samples indicate there have some influence of fluvial
Figure 15: Bivariate plot between (a) Y1 vs Y2, (b) Y2 vs Y3, (c) Y3 vs Y4 marine and deltaic or lacustrine environment of sediment deposition (Fig. 13). The deltaic environment shows for two samples indicate there have some influence of fluvial
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Sedimentary PetrologyCox's Bazartotal suspended solid (TSS)Sediment Distribution
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