Sundarban delta is one of the most dynamic ecosystems of the world. Several river channels criss-cross the Sundarban delta and bring with them, tons of suspended sediments, nutrients, and polluting substances from terrestrial sources, and play a major role in India's biggest mangrove ecosystem. This paper deals with the multitemporal study of different water quality parameters (nitrate, phosphate, heavy metal, and suspended sediment concentration) of this zone. Distribution of different water quality parameters was determined by using the data set collected from 17 sampling stations distributed between Hooghly and Matla estuary. Sampling of water was done during the early pre-monsoon seasons (March-April) of both 1998 and 2004. Interpolation technique (inverse distance weightage) was used to carry out spatial analysis of water quality distribution in this area, and a spatial distribution map of several water quality parameters was generated. Finally, a pollution map of Sundarban coastal water between 1998 and 2004 was prepared, giving weightage to various parameters using Arc-GIS software, and an increase of pollution level was detected within the area.

Sundarban mangrove Several tons of fertilizers, pesticides and synthetic detergents are used annually in India. A considerable quantity of these materials is biodegradable, while others are not. Their cumulative effect over a long period of time could be quite harmful to the coastal and marine environment. The Ganga river annually adds approximately, 1.46 billion tons of silt. A considerable quantity of this material enters into the sea, discharging heavy metals and pesticides.

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