School Of Environment And Earth Sciences

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Browsing School Of Environment And Earth Sciences by Author "Acharyya, Tamoghna"

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    Analyzing shoreline dynamicity and the associated socioecological risk along the Southern Odisha Coast of India using remote sensing-based and statistical approaches
    (Taylor and Francis Ltd., 2021-02-06T00:00:00) Mishra, Manoranjan; Acharyya, Tamoghna; Chand, Pritam; Santos, Celso Augusto Guimar�es; Kar, Dipika; Das, Prabhu Prasad; Pattnaik, Namita; Silva, Richarde Marques da; Nascimento, Thiago Victor Medeiros do
    The coastal zone is an extremely volatile environment and is constantly changing. We assessed short- and long-term shoreline changes in the Ganjam district of Odisha on the eastern coast of India from 1990 to 2019 using Landsat satellite imagery and the Digital Shoreline Analysis System (DSAS) tool in a geographic information system. In addition, we have also projected the likely future coastline position for the 2030�2040 period and the possible impact on the socioecology of the shoreline. In this study, we used the endpoint rate (EPR) analysis, weighted linear regression (WLR) analysis, and trigonometric functions to analyze the shoreline from 1990 to 2019 and also forecasted for year 2030 and 2040. The shoreline of the Ganjam coastal zone is one of the most biologically productive ecosystems in the world, and it is well-known due to the breeding and mass nesting grounds of olive ridley turtles and the economically connected ports, famous beaches, and cyclone-prone areas. During the study period (1990�2019), the average erosion and accretion rates in the Ganjam shoreline were ?2.58 m/year and 11.63 m/year, respectively. The rate of shoreline erosion increased during years of cyclone landfall, which was revealed during the short-term shoreline analysis of the periods from 1995 to 2000 (1999 super cyclone) and 2015 to 2019 (2019 category�IV cyclone Fani). The short- to long-term analyses of the shoreline assisted in identifying erosion (Ramyapatna, Podampetta) and accretion (southern part of Gopalpur port, spits along the Bahuda and Rushikulya Rivers) hotspots within the Ganjam coastal zone. The identified erosion hotspots could submerge a significant number of coastal villages that serve as breeding and mass nesting grounds for olive ridley turtles. The dominant erosion along the Ganjam coastline are likely to enhance socioecological risk and further threaten coastal communities in the future. The output of the undertaken research will benefit coastal planners, policymakers, and conservationists by helping them to formulate the most suitable action plan for coastal zone management with consideration of all stakeholders. � 2021 Informa UK Limited, trading as Taylor & Francis Group.
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    Contextualizing the lake ecosystem syndromes and research development activities in Chilika Lake (Odisha coast, India): a bibliometric overview (1970�2021)
    (Springer Science and Business Media B.V., 2023-05-25T00:00:00) Acharyya, Tamoghna; Sudarsan, Desul; Mishra, Manoranjan; Santos, Celso Augusto Guimar�es; Chand, Pritam; da Silva, Richarde Marques; Pradhan, Subhasis
    Chilika Lagoon is traditionally known as a productive study site for various areas of knowledge. It is also well-known for its successful ecological restoration in 2000, following ecological degradation due to siltation and proliferation of weeds in the 1980s and 1990s. Since then, Chilika Lagoon has been facing various coastal syndromes that are likely to worsen due to climate change and increasing anthropogenic pressure on its waters and catchment area. This study analyzed bibliometric data from the Scopus database over the past five decades (1970?2021) to understand the ever-evolving publication pattern and research domains in Chilika Lagoon. A total of 457 records were selected for the analyzed period, with contributions from 944 authors, primarily in peer-reviewed journal articles (86%). Although the number of publications and citations is increasing, as expected, there is minimal international collaboration. An interesting pattern was found in�publication and research themes, correlating with the evolving history of lagoon management and governance. The establishment of the Wetland Research and Training Centre led to a surge in research publications from 2002 onwards. However, a mismatch appears to exist�between the research scope and publication records, as evidenced by the mere 11 seagrass-related records in Scopus, even though Chilika Lagoon hosts the second-largest seagrass patch in India. Simultaneously, there is a lack of research addressing the real-world challenges faced by the local people who depend on Chilika Lagoon for their livelihoods. Graphical abstract: [Figure not available: see fulltext.]. � 2023, The Author(s), under exclusive licence to Springer Nature B.V.
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    Deciphering the impact of anthropogenic coastal infrastructure on shoreline dynamicity along Gopalpur coast of Odisha (India): An integrated assessment with geospatial and field-based approaches
    (Elsevier B.V., 2022-10-22T00:00:00) Mishra, Manoranjan; Kar, Prabin K.; Chand, Pritam; Mohanty, Pratap K.; Acharyya, Tamoghna; Santos, Celso Augusto Guimar�es; Gon�alves, Rodrigo Mikosz; Silva, Richarde Marques da; Bhattacharyya, Debdeep; Beja, Santosh Kumar; Behera, Balaji
    Odisha's coastline supports various development activities that are critical to the state and national economy, such as oil and gas, ports and harbors, power plants, fishing, tourism, and mining that continues to not only detriment the coastal ecology but also affect the overall shoreline morphodynamics. The morphological changes are complicated processes involving both natural and human-induced drivers, but it is critical to understand how recent development activities further impact beach morphodynamics and shoreline dynamicity. The study analyzes the overall shoreline morphodynamics in response to the recent development of port and other related infrastructure for annual and decadal scale using two-dimensional (2-D) shoreline changes along with detailed 3-D beach profile volumetric changes for different studied zones along the Gopalpur coast. The results reveal that nearly all studied zones of the Gopalpur shoreline, Zone-4 (EPR = ?05.64 m a?1 and LRR = ?04.25 m a?1), Zone-3 (EPR = ?04.51 m a?1 and LRR = ?07.01 m a?1) and Zone-1 (EPR = ?2.85 m a?1 and LRR = ?01.46 m a?1), experienced erosion between 2010 and 2020 except Zone-2 (EPR = 24.31 m a?1 and LRR = 25.96 m a?1), which showed overall sign of deposition. The interannual shoreline analysis depicted that Zone-1 (tourist beach area) remained almost stable, Zone-2 (south of the breakwater of Gopalpur Port) showed accretion trends, Zone-4 (north side of the port) dominantly showed an erosion pattern, whereas Zone-3 (port area) showed a high level of uncertainty in the context of erosional or deposition trends. Calculated volumetric loss along the surveyed 3-D beach profiles supports these 2-D changes for all the studied zones. The results showed substantial changes in coastal morphodynamics in different studied zones of the Gopalpur region and severe erosion along its northern segment of the constructed coastal infrastructure. These findings can potentially promote effective coastal zone management and prevent further deterioration along the Gopalpur coast in future. � 2022 Elsevier B.V.
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    Mapping main risk areas of lightning fatalities between 2000 and 2020 over Odisha state (India): A diagnostic approach to reduce lightning fatalities using statistical and spatiotemporal analyses
    (Elsevier Ltd, 2022-07-04T00:00:00) Mishra, Manoranjan; Acharyya, Tamoghna; Santos, Celso Augusto Guimar�es; Silva, Richarde Marques da; Chand, Pritam; Bhattacharyya, Debdeep; Srivastava, Sanjay; Singh, Omvir
    This study analyzes the spatiotemporal variation of lightning flashes and lightning strike deaths from 2001 to 2020 among all 30 districts of Odisha State, India. Lightning flash data for the study area were acquired from Lightning Imaging Sensor (LIS) installed aboard the Tropical Rainfall Measuring Mission (TRMM) for the 2001�2014 period and from International Space Station for the 2017�2020 period. Deaths by lightning flashes were acquired from the annual report of natural calamities for the 2001�2020 period from the Revenue and Disaster Management Department, Government of Odisha. In this study, the spatial pattern of lightning flashes based on LIS data and resultant deaths were assessed using spatiotemporal statistical analysis, including the interpolation method and Sen's slope estimator. The geospatial heat maps of lightning strikes and deaths highlight the spatiotemporal heterogeneity of lightning strikes and induced deaths in Odisha State. Furthermore, statistical analyses demonstrate an apparent increase in lightning strikes in the state as a whole, with particular attention to the Mayurbhanj, Sundargarh, and Keonjhar districts, which had the highest incidence of lightning. Odisha State was hit by more than 10,000 lightning strikes every year between 2000 and 2020, excluding 2001, 2017, and 2018. The results show a moderate correlation (R = 0.61) between lightning strikes and lightning deaths in Odisha State during the analyzed period, which further needs to be investigated with respect to the seasonality of lightning, the locational vulnerability, and temporal risk. � 2022 Elsevier Ltd
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    Response of long- to short-term tidal inlet morphodynamics on the ecological ramification of Chilika lake, the tropical Ramsar wetland in India
    (Elsevier B.V., 2021-10-06T00:00:00) Mishra, Manoranjan; Acharyya, Tamoghna; Chand, Pritam; Santos, Celso Augusto Guimar�es; Silva, Richarde Marques da; Santos, Carlos Antonio Costa dos; Pradhan, Subhasis; Kar, Dipika
    The long- to short-term morphodynamic response in low-lying coastal wetlands raises serious concerns worldwide about the loss of their biodiversity and ecological ramifications due to change in tidal amplitude and cyclonic events. One such place worth studying is Chilika lake, India, a prominent Ramsar site, the largest brackish water lagoon in Asia, and the second-largest coastal lagoon in the world. It experiences frequent cyclone landfalls and strong littoral drift that tends to open/close the tidal inlet. The goal of this study was to analyze the response of slow onset events such as long- (1952�2020) to short-term (~annual scale from 1989 to 2020) tidal inlet movement, shoreline change (1990�2020 with almost every five-year interval), spit morphodynamics (~annual scale from 1989 to 2020) on ecological ramification in Chilika lake as well as the implications of sudden onset event such as cyclonic landfall. In this study, we used the Digital Shoreline Change Analysis System (DSAS) to compute the statistics of shoreline change rate by calculating end point rate (EPR) values for short-term shoreline change (1990, 1995, 2000, 2005, 2011, 2016, and 2020) and weighted linear regression (WLR) for long-term shoreline change (1990�2020). The results show that Chilika lake experienced both erosion and accretion processes with a remarkably high erosion rate of 19.87 m year?1 and accretion of 16.91 m year?1 during a long-term scale (1990�2020). The average erosion and accretion rates were 2.25 m year?1 and 4.67 m year?1, respectively, during the past three decades (1990�2020). The short-term analysis suggests that the highest mean erosion of 4.37 m year?1 occurred during 2005�2011, mainly due to cyclonic storms, reduction in sediment discharge, and lunar eclipse, which induced tide with very high amplitude in August 2008. Overall, the annual scale analysis of tidal inlet shows a shifting trend towards the northward side even after the artificial opening of an inlet in 2000. It can be ascribed mainly to the prevalent direction of longshore drift along this coast. This study observed that the landfall of cyclones significantly affects the spit morphodynamics and opening of the tidal inlet, which defines the inflow of the seawater into the lagoon and further substantial impacts on the ecological ramification. The current study's methodology can be extended to comprehend the response of long- to short-term changes of the tidal inlet, shoreline, and spit morphodynamics on the ecological ramification of coastal lagoons worldwide along with impacts of sudden-onset events caused by cyclonic landfall. � 2021 Elsevier B.V.