Estimating Water Quality of Sundarban Coastal Zone Area Using Landsat Series Satellite Data

2021 ◽  
pp. 155-176
Author(s):  
Ismail Mondal ◽  
Sandeep Thakur ◽  
Amlan De ◽  
Jatisankar Bandyopadhyay ◽  
Tarun Kumar De
2018 ◽  
Vol 3 (3) ◽  
pp. 187-196
Author(s):  
Renata Aparecida Costa ◽  
Antonio Roberto Saad ◽  
Anderson Targino da Silva Ferreira ◽  
Maria Carolina Hernandez Ribeiro ◽  
Regina De Oliveira Moraes Arruda

Brazilian coastal zone comprises more than 8,000 km of extension, which together with the tropical climate, increase the interest of the coastal tourism in the coastal zone. Consequently, the demand for services in coastal cities, such as basic sanitation, is also increasing. In this way, the evaluation of the beach waters quality is of great relevance, since the contact with contaminated water can raise the exposure to pathogenic microorganisms and with this the transmission of waterborne diseases. The objective of this study was to evaluate the balneability of two beaches (Enseada and São Lourenço, municipality of Bertioga, São Paulo State, SP, Brazil) using sanitary conditions as indicators. The soil coverture and sanitary sewage system were related to the quality of the beach waters. For the analyzed period (2010 to 2016) a direct correlation (R = 0.58 and R = 0.46) was observed between the monitoring stations balneability using the criteria of the “Conselho Nacional do Meio Ambiente” (National Council of the Environment) CONAMA 274/2000 and the World Health Organization, respectively, and the index of the sanitary sewage system for the region, similarly, the coefficient of determination (R²) presented values of 0.34 and 0.21. The results of the applied methodology allowed a satisfactory evaluation of the water quality of selected beaches and suggested that the São Lourenço beach has a better sanitary sewage system and, consequently, a better bathing water quality and lower risks to the bathers health, while the Enseada Beach presented regular indices due to the lack of a sewage collection system in most of this settlement area. ResumoA zona costeira brasileira compreende mais de 8.000 km de extensão, que aliada ao clima tropical, aumentam o interesse pelo turismo no litoral. Consequentemente, também aumenta a sobrecarga nos serviços das cidades litorâneas, como o de saneamento básico. Dessa forma, a avaliação da qualidade das águas praiais é de grande relevância, pois o contato dos banhistas com águas contaminadas pode elevar a exposição a microrganismos patogênicos, e com isso a transmissão de doenças de veiculação hídrica. O objetivo deste estudo foi avaliar a balneabilidade de duas praias (Enseada e São Lourenço, município de Bertioga-SP, SE Brasil) utilizando-se as condições sanitárias como indicadores. Para isto, buscou-se relacionar a cobertura do solo e esgotamento sanitário com a qualidade das águas das praias. Para o período analisado (2010 a 2016), observou-se uma correlação direta (R = 0,58 e R = 0,46) entre a balneabilidade dos pontos de monitoramento (critérios da Resolução CONAMA 274/2000 e da Organização Mundial da Saúde, respectivamente) e o índice de esgotamento sanitário da região; de maneira semelhante, o coeficiente de determinação (R²) apresentou valores 0,34 e 0,21. Por fim, os resultados mostraram que a metodologia utilizada permitiu avaliar a balneabilidade das praias selecionadas de forma satisfatória. Assim, a praia de São Lourenço demonstrou melhores condições de esgotamento sanitário e, como consequência, melhor balneabilidade e menores riscos à saúde dos banhistas, enquanto que a Praia da Enseada apresentou índices regulares em decorrência da inexistência de rede coletora de esgoto na maior parte de sua área.


2020 ◽  
Vol 215 ◽  
pp. 04003
Author(s):  
Yuriy Dreizis

Sea resort areas are currently one of the most successful developing regions. At the same time, the ecological condition of such regions is important, especially those that specialize in the provision of recreational and tourist services. The quality of coastal water resources played an important role in the sustainable development of those coastal tourist areas. Analysis of physical factors of water exchange was carried out and assessment of water resources quality of the coastal zone of the sea was made, including in closed and semi-enclosed water areas. It has been shown that water exchange is the most important factor in the management of the quality of marine waters of partially enclosed coastal areas. The results of the studies made it possible to assess the circulation of coastal marine waters and the change in certain indicators of water quality, including in the presence of various coastal protection facilities, based on 0-dimensional and system-dynamic models. The results obtained can be used to predict the state of water resources in coastal territories.


2019 ◽  
Vol 17 (1) ◽  
pp. 172
Author(s):  
Muhammad Sri Yusal ◽  
Muh Aris Marfai ◽  
Suwarno Hadisusanto ◽  
Nurul Khakhim

The coastal zone of Losari Beach is located in a strategic position and rich in potential coastal resources, but the high density of human activities has decreased the quality of the surrounding waters.This study aimed to examine water quality based on meiofauna abundance and pollution index in the coastal zone of Losari Beach, Makassar. It employed a quantitative descriptive approach with purposive sampling method. The identified total meiofauna abundance was117,176 individuals/m2consisting of 138 species from 13 phyla. Ostracoda, olygochaeta, sarcomastigophora, ciliophora, and polychaetawere phyla with the highest abundance because of their high adaptability to polluted aquatic conditions. Meanwhile, tardigrada and aelosomatidaewere found in very low abundance because both phyla only thrive in pollution-free environments and have a pattern of high migration flow from one habitat to another. As for aelosomatidae, the habitat of its speciesis limitedto brackish or saline waters. A good-quality aquatic environment is a habitat for all benthic organisms and enables their even distribution. It explains the discovery of true and temporary meiofauna with uniform or even compositions in the bottom of the waters. The waters in the coastal zone of Losari Beach are heavily polluted. The stationslocated around the traditional Paotere harbor, hotels, restaurants, Losari Beach Platforms, the waste disposal outlets of Stella Maris Hospital, Fort Rotterdam canals, and Jeneberang River mouthhad very high pollution index. Some of these stations had low meiofauna abundance levels, and the poor water quality in their surroundings was caused by anthropogenic activity. Even though the area around TanjungMerdeka Beach had relatively low pollution index, it was categorized as severely contaminated because the index score was >10.


2011 ◽  
Vol 62 (3) ◽  
pp. 573-580 ◽  
Author(s):  
N. Janelidze ◽  
E. Jaiani ◽  
N. Lashkhi ◽  
A. Tskhvediani ◽  
T. Kokashvili ◽  
...  

2021 ◽  
Vol 21 (2) ◽  
pp. 133-148
Author(s):  
Thu Trinh Hoai ◽  
Thuy Huong Tran Thi ◽  
Phuong Quynh Le Thi ◽  
Phuong Vu Le ◽  
Anh Le Duc ◽  
...  

This study represents the application of the Water Quality Indices (WQI) and GIS techniques to grading water pollution and the factors that influenced the groundwater quality of the Holocene (qh) and Pleistocene (qp) aquifers in the coastal zone of Ninh Thuan province. 100 underground water samples were collected from residential water well of qh aquifer (53 samples) and qp aquifer (47 samples). Water quality indices using in the study incorporated total dissolved solids (TDS), chloride (Cl-), flouride (F-), nitrite (NO2-), nitrate (NO3-), iron (Fe3+), manganese (Mn2+). Calculated WQI grading scale for the groundwater quality of the 100 water samples ranged from very good to inedible for drinking purpose. The result shown the water sample graded as “excellent water quality” accounted the most (23,3% and 14,9% for the qh and qp aquifer, respectively), the followings were “good water quality” grade ranked the second (9,4% and 8,5%); “poor water quality” grade (43,4% and 30,04%); “very poor water quality” grade (1,89% and 10,64%); and “inedible” grade (16,98% and 31,9%). Water samples graded as “very poor” and “inedible” were mostly distributed on the southeast of Ninh Hai district and Tri Hai commune (Ninh Hai district), Xuan Hai and Cong Hai communes (Thuan Bac district), Phuoc Thuan (Ninh Phuoc district) of the qh aquifer, and to the south of study area of the qp aquifer because of the exceptionally high TDS. Other samples which were low on TDS but graded “bad” due to surprisingly high concentrations of other ions (Cl-, NO3-, NO2-). The result provided concreted information on the polluted agents in groundwater and a valuable tool to support authorities in management and zoning groundwater quality of the study area.


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