Coastal waters are considered to be the pillar and essential of Marine life. The study of Hydrographic properties of coastal environments is important, because the variations in the instantly influence on the floral and faunal production. The variations affect the species diversity, pattern of diversity, breeding, survival and other activities. To maintain optimum level of water quality parameters is better for the species survival and healthy ecosystem. The present study was carried out to determine the Hydrographic variations in coastal Waters of Someshwara, Panambur and Bengre beaches along the Mangaluru, south west coast of India. The sampling of coastal water was carried out from August 2016 to July 2017 over all three beaches at nine stations along the Mangaluru coast between 12° 47′ 748″ N to 12° 56′ 449″ N and 74° 50′ 780″ E to 74° 48′ 207″ E was studied. Spatial and temporal variations of the hydrographical parameters like temperature, salinity, pH, dissolved oxygen, ammonia, inorganic nitrite, nitrate, phosphate, silicate, and sediment organic carbon analyzed. The results showed decline in the quality of water during the non-monsoon season compared to that in the monsoon season. The dissolved oxygen and nutrients was found to be low in summer and high during monsoon season. Similarly temperature, pH and salinity were low during monsoon and high during summer season. The hydrographic properties have exhibited considerable seasonal and spatial variations.

Keywords : Hydrographical properties, Nutrients, South west monsoon, Coastal water, west coast of India.