Seasonal variability in water chemistry and sediment characteristics of intertidal zone at Karnafully estuary, Bangladesh

Document Type : Original Research Paper


1 Institute of Marine Sciences and Fisheries, University of Chittagong, Chittagong 4331, Bangladesh

2 Department of Marine Bio-resources Science, Faculty of Fisheries, Chittagong Veterinary and Animal Sciences University, Chittagong 4225, Bangladesh

3 Shushilan, Khulna, Bangladesh



The Karnafully is one of the most important rivers due to its profound influence on water chemistry and sediment characteristics. The present study intended to assess the quality of water and sediment from intertidal zone of this river in respect to the pollution index. Seasonal water and sediment samples were collected during four seasons (Monsoon, post-monsoon, winter, and pre-monsoon) of 2014. The result indicates that these investigated parameters ranged as water temperature (21.7-36 °C), pH (8.0-8.7), salinity (2.4-8.8‰), total suspended solid (0.08-0.8 g/L), dissolve oxygen (0.00-4.52 mg/L), soil temperature (21.3-33 °C), pH (5.0-6.8), sand (4.13-44.10%), silt (39.93-75.89%), clay (11.98-21.19%), soil organic matter (4.33-6.21%), organic carbon (2.5-3.6%), nitrite-nitrogen (0.69-3.97 µg/L), and phosphate-phosphorus (0.23-3.44 µg/L). Multivariate statistical analyses like post-hoc LSD test, Cluster Analysis (CA), and Principal Component analysis (PCA) brought out the spatial and temporal changing pattern of water chemistry and sediment characteristics with the effect of uprising pollution. CA ascertained the compatibility among different parameters and categorized the monitoring sites into highly and moderately polluted areas. Moreover, PCA brought out five primary components and highlighted the three dormant factors, enormously regulating the river water chemistry such as municipal waste, carbon based nitrogenous compound, and local geomorphological weathering process. This investigation provided an outline on deterioration of water and sediment quality by high anthropogenic impact and suggests national policy maker to take some initiatives for retaining the quality water and sediment properties. 


Adeyemo, O.K., Adedokun, O.A., Yusuf, R.K. and Adeleye, E.A. (2008). Seasonal changes in Physico-chemical parameters and nutrient Load of river sediments in Ibadan city, Nigeria. Global NEST J., 10(3), 326-336.
Ahmed, A.U. and Reazuddin, M. (2000). Industrial pollution of water systems in Bangladesh. In Rahaman, A.A., Huq, S. and Conway, G.R. (Eds.). Environmental system of surface water systems of Bangladesh, University Press Limited, Dhaka, Bangladesh. pp. 175-178.
Ajayan, A. and Kumar, K.G.A. (2016). On the seasonal changes in the surface water chemistry of Museum Lake, Thiruvananthapuram, Kerala, India. Pollution, 2(2), 103-104.
Anilakumary, K.S., Abdul Aziz, P.K. and Natrajan, P. (2007). Water quality of the Adimalathma estuary, southwest coast of India. J. Mar. Biol. Ass. India, 49, 1-6.
APHA [American Public Health Association] (2005). Standard methods for examination of water and wastewater. Eaton, A.D., Clesceri, L.S., Rice, E.W. and Greenberg, A.E. (Eds.), 21st edition, American Water Works Association, Water Pollution Control Federation, Washington DC, New York. pp. 1368.
Bouyoucos, G.J. (1962). Hydrometer Method Improved for Making Particle Size Analysis of Soils. Agr. J., 54(5), 464-465. DOI: 10.2134/agronj1962.00021962005400050028x.
Brils, J. (2008). Sediment monitoring and the European water framework directive. Annalidell’Istituto Superiore di Sanita 44(3), 218-223.
Chen, Y.C., Yeh, H.C. and Wei, C. (2012). Estimation of river pollution index in a tidal stream using Kriging analysis. Int. J. Environ. Res. Public Health, 9, 3085-3100.
Chowdhury, M.S.N., Hossain, M.S., Das, N.G. and Barua, P. (2010). Environmental variables and fisheries diversity of the Naaf River Estuary, Bangladesh.J. Coast. Conserv., 15(1), 163-180.
Damotharan, P., Perumal, N.V. and Perumal, P. (2010). Seasonal variation of physico-chemical characteristics of Point Calimere coastal waters (South east coast of India). Middle East J. Sci. Res., 6(4), 333-339.
Das, B., Khan, Y.S.A. and Sarker, M.A.K. (2002). Trace metal concentration in water of the Karnaphuli river estuary of the Bay of Bengal. Pak. J. Biol. Sci., 5, 607-608.
Förstner, U. (2004). Sediment dynamics and pollutant mobility in rivers: An interdisciplinary approach. Lakes Reserv. Res. Manage., 9(1), 25-24. DOI: 10.1111/j.1440-1770.2004.00231.x
Gupta, I., Dhage, S. and Kumar, R. (2008). Study of variations in Water quality of Mumbai coast through multivariate analysis techniques. Indian J. Mar. Sci., 38(2), 170-177.
Holmgren, S. (1994).An environmental assessment of the Bay of Bengal region. Swedish Centre for Coastal Development and Management of Aquatic Resources. pp. 79.
Huq, S.M.I. and Alam, M.D. (2005).A Handbook on Analyses of Soil, Plant, and Water. BACER-DU, University of Dhaka, Dhaka. pp. 1-246.
Jiang-Qi, Q., Qing-Jing, Z., Pan, L., Cheng-Xia, J. and Mu, Y. (2013). Assessment of Water Quality Using Multivariate Statistical Methods: A Case Study of an urban Landscape Water, Beijing. Int. J. Biosci. Biochem. Bioinforma, 3(3), 196-200.
Jorcin, A. (2000). Physical and Chemical characteristic of the sediment in the estuarine region of cananeia (SP), Brazil. Hydrobiologia, 431(1), 59-67.
Kamal, A.H.M. and Khan, M.A.A. (2009). Coastal and estuarine resources of Bangladesh: management and Conservation issues. Maejo Int. J. Sci. Technol., 3(2), 313-342.
Kowalkowski, T., Zbytniewski, R., Szpejna, J. and Buszewski, B. (2006). Application of chemo metrics in water classification. Water Research, 40(4), 744-752.
Kunickis, S.H., Gilliam, J.W., Evans, R.O. and Dukes, M. (2010). Soil characteristics and their role in developing conditions favorable for denitrification. 19th World Congress of Soil Science, Soil Solutions for a Changing World, 1-6 August, Brisbane, Australia.  DOI:
Liou, S.M., Lo, S.L. and Wang, S.H. (2004). A generalized water quality index for Taiwan. Environ. Monit. Assess., 96, 35-52.
Mahmood, N., Khan, Y.S.A. and Kabir, A. (1976). Studies on the hydrology of the Karnaphuli estuary. J. Asiat. Soc. Bangladesh [Sci.], 2(1), 89-99.
Manikannan, R., Asokan, S. and Samsoor, A.H.M. (2011). Seasonal variations of physico-chemical properties of the Great Vedaranyam Swamp, Point Calimere Wildlife Sanctuary, South-east coast of India. Afr. J. Environ. Sci. Technol., 5(9), 673-681.
Manjappa, H., Gowda, G., Rajesh, K.M. and Mridula, R.M. (2003). Sediment characteristics of mangrove areas of brackish water impoundments. Indian J. Fish., 50(3), 349-354.
Murdoch, T., Cheo, M. and O-Laughlin, K. (2001). Streamkeeper's Field Guide: Watershed Inventory and Stream Monitoring Methods. Adopt-A-Stream Foundation, Everett, WA. pp. 297.
Parsons, T.R., Takahashi, M. and Hargrave, B. (1977). Biological Oceanographic Process. Pergamon Press, London.pp. 332.
Prabu, V.A., Rajkumar, M. and Perumal, P. (2008). Seasonal variations in physico-chemical characteristics of Pichavaram mangroves, southeast coast of India. J. Environ. Biol., 29(6), 945-950.
Pradhan U.K., Shirodkar, P.V., Sahu, B.K. (2009). Physico-chemical characteristics of the coastal water off Devi estuary, Orissa and evaluation of its seasonal changes using chemometric techniques. Curr. Sci., 96(9), 1203-1209.
Prasanna, M. and Ranjan, P.C. (2010). Physico chemical properties of water collected from Dhamra estuary. Int. J. Environ. Sci., 1(3), 334-342.
Qadir, A., Malik, R.N. and Husain, S.Z. (2007). Spatio-temporal variations in water quality of NullahAik-tributary of the river Chenab, Pakistan. Environ. Monit. Assess., 140(1-3), 43-59.
Raja, P., Amarnath, A.M., Elangovan, R. and Palanivel, M. (2008). Evaluation of physical and chemical parameters of River Kaveri, Tiruchirappalli, Tamil Nadu, India. J. Environ. Biol., 29(5), 765-768.
Rajasegar, M. (2003). Physicochemical characteristics of the Vellar estuary in relation to shrimp farming. J. Environ. Biol., 24(1), 95-101.
Ravaniah, G., Kumari, P.G. and Murthy, N.C.V. (2010). Water quality analysis of the pennar estuary, Nellore. J. Curr. Sci., 15 (2), 321-334.
Saravanakumar, A., Rajkumar, M., Sesh, J. and Thivakaran, G.A. (2008). Seasonal variations in physico-chemical characteristics of water, sediment and soil texture in arid zone mangrove of Kachchh-Gujarat. J. Environ. Biol., 29(5), 725-732.
Sarwar, M.I., Majumder, A.K. and Islam, M.N. (2010). Water quality Parameters: A case study of Karnaphuly River Chittagong, Bangladesh. Bangladesh J. Sci. Ind. Res., 45(2), 177-181.
Satheeshkumar, P. and Khan, A.B. (2012). Identification of mangrove water quality by multivariate statistical analysis methods in Pondicherry coast, India. Environ. Monit. Assess., 4(6), 3761-74. DOI:
Singare, P.U., Mishra, R.M. and Trivedi, M.P. (2011). Assessing the Health of Sediment Ecosystem of Mithi River of Mumbai: Use of Physico-Chemical Measurements. Resources and Environment, 1(1), 32-41.
Singh, K.P., Malik, A., Mohan, D. and Sinha, S. (2004). Multivariate statistical techniques for the evaluation of spatial and temporal variations in water quality of Gomti River (India) - a case study. Water research, 38 (18), 3980-3992.
Srivastava, N., Harit, G. and Srivastava, R. (2009). A study of physico-chemical characteristics of lakes around Jaipur, India. J. Environ. Biol., 30(5), 889-894.
Talukder, A., Mallick, D., Hasin, T., Anka, I.Z. and Hasan, M.M. (2016). Spatio-temporal variability in hydro-chemical characteristics of coastal waters of Salimpur, Chittagong along the Bay of Bengal. J. Fish., 4(1), 335-344. DOI:
Venkatesharaju, K., Somashekar, R.K. and Prakash, K.L. (2010). Study of seasonal and special variation in surface water quality of Cauvery river stretch in Karnataka. J. Ecol. Nat. Environ., 2(1), 1-9.
Wagai, R., Mayer, L.M. and Kitayama, K. (2009). Nature of the “occluded” low-density fraction in soil organic matter studies: a critical review. Soil Sci. Plant Nutr., 55(1), 13-25.
Wang, X., Cai, Q., Ye, L. and Qu, X. (2012). Evaluation of spatial and temporal variation in stream water by multivariate statistical techniques: A case study of the Xiangxi River basin, China. Quaternary International, 1, 1-8.
Wang, Y.B., Liu, C.W., Liao, P.Y. and Lee, J.J. (2014). Spatial pattern assessment of river water quality: implications of reducing the number of monitoring stations and chemical parameters. Environ. Monit. Assess., 186, 1781-1792. DOI: