Earth System Science Organization ESSO National Institute of Ocean Technology ESSO NIOT

Bhubaneshwar, India

Earth System Science Organization ESSO National Institute of Ocean Technology ESSO NIOT

Bhubaneshwar, India

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Jha D.K.,Earth System Science Organization ESSO National Institute of Ocean Technology ESSO NIOT | Jha D.K.,Andaman and Nicobar Center for Ocean Science and Technology | Devi M.P.,Bharathidasan University | Vidyalakshmi R.,Bharathidasan University | And 3 more authors.
Marine Pollution Bulletin | Year: 2015

Seawater samples at 54 stations in the year 2011-2012 from Chidiyatappu, Port Blair, Rangat and Aerial Bays of Andaman Sea, have been investigated in the present study. Datasets obtained have been converted into simple maps using coastal water quality index (CWQI) and Geographical Information System (GIS) based overlay mapping technique to demarcate healthy and polluted areas. Analysis of multiple parameters revealed poor water quality in Port Blair and Rangat Bays. The anthropogenic activities may be the likely cause for poor water quality. Whereas, good water quality was witnessed at Chidiyatappu Bay. Higher CWQI scores were perceived in the open sea. However, less exploitation of coastal resources owing to minimal anthropogenic activity indicated good water quality index at Chidiyatappu Bay. This study is an attempt to integrate CWQI and GIS based mapping technique to derive a reliable, simple and useful output for water quality monitoring in coastal environment. © 2015 Elsevier Ltd.


PubMed | Andaman and Nicobar Center for Ocean Science and Technology, Bharathidasan University and Earth System Science Organization ESSO National Institute of Ocean Technology ESSO NIOT
Type: | Journal: Environmental pollution (Barking, Essex : 1987) | Year: 2016

Urbanization of coastal areas in recent years has driven us to consider a new approach for visually delineating sites that are contaminated with fecal bacteria (FB) in the coastal waters of the Andaman Islands in India. Geo-spatial analysis demarcated harbor, settlement, and freshwater/discharge influenced zones as hot spots for FB, while the open sea was demarcated as a cold spot. The land use types, such as developed and agriculture, with more anthropogenic activities increasing the FB counts while open sea showed the least FB. Box whisker plot indicated an increasing FB trend in the coastal waters during monsoon. Furthermore, principal component analysis revealed 67.35%, 78.62% and 70.43% of total variance at Port Blair, Rangat and Aerial bays, respectively. Strong factor loading was observed for depth (0.95), transparency (0.93), dissolved oxygen (0.93) and fecal streptococci (0.85). Distance proximity analysis revealed that fecal contaminations diluted significantly (P<0.05) at the distance of 2.1km toward the deeper or open sea water. This study demonstrates the effectiveness of an integrated approach in identifying the sources of fecal contamination and thus helping in better monitoring and management of coastal waters.


PubMed | Andaman and Nicobar Center for Ocean Science and Technology, Bharathidasan University and Earth System Science Organization ESSO National Institute of Ocean Technology ESSO NIOT
Type: Journal Article | Journal: Marine pollution bulletin | Year: 2015

Seawater samples at 54 stations in the year 2011-2012 from Chidiyatappu, Port Blair, Rangat and Aerial Bays of Andaman Sea, have been investigated in the present study. Datasets obtained have been converted into simple maps using coastal water quality index (CWQI) and Geographical Information System (GIS) based overlay mapping technique to demarcate healthy and polluted areas. Analysis of multiple parameters revealed poor water quality in Port Blair and Rangat Bays. The anthropogenic activities may be the likely cause for poor water quality. Whereas, good water quality was witnessed at Chidiyatappu Bay. Higher CWQI scores were perceived in the open sea. However, less exploitation of coastal resources owing to minimal anthropogenic activity indicated good water quality index at Chidiyatappu Bay. This study is an attempt to integrate CWQI and GIS based mapping technique to derive a reliable, simple and useful output for water quality monitoring in coastal environment.

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