Sugata Hazra

Sugata Hazra
Jadavpur University | JU · School of Oceanographic Studies

PhD

About

205
Publications
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Introduction
Skills and Expertise
Additional affiliations
September 2002 - present
Jadavpur University
Position
  • Professor & Director

Publications

Publications (205)
Article
Constant monitoring of the mangroves is important for understanding their health species assemblage and undertaking policies to rehabilitate or restore them. In this study, an attempt was made to classify and detect health and carbon stock in mangroves through a Remote Sensing perspective. The AVIRIS-NG dataset with high spectral (5nm) and spatial...
Article
Full-text available
Estuaries and coastal waters are generally significant emitters of CO2 to the atmosphere. Globally, submarine groundwater discharge (SGD) is a significant driver of inorganic carbon dynamics and the partial pressure of CO2 in water [pCO2(water)] in estuaries and coastal waters. However, there are few studies of CO2 emission and SGD in large tropica...
Article
The sub-humid regions of India have become vulnerable to recurrent drought in recent times due to climate change. Rainwater harvesting (RWH) has a promising potential to overcome water scarcity under a warming climate. The present study emphasizes a pragmatic methodology for evaluating potential sites for RWH structures (RWHSs) implementing multipl...
Article
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Expansion of aquaculture in the Sundarbans Biosphere Reserve (SBR) is irreversibly replacing agricultural land and the drivers of this change are disputed. Based on in-depth interviews with 67 aquaculture farmers, this paper characterizes major aquaculture types in the SBR, their impacts, and identifies drivers of conversion from agricultural land....
Article
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Indian Sundarbans Biosphere Reserve (SBR) comprising over 100 estuarine islands and shared by human habitation and mangrove forests is considered to be a potential area for coastal aquaculture. This study, using LANDSAT imageries of the last two decades (1999–2019), delineated the spatiotemporal expansion of aquaculture at the expense of agricultur...
Article
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Tidal and lunar phases often influence the behavior and life-cycle of the different fishes, especially the migratory species. In the Hooghly River estuary, Hilsa shad is an anadromous fish species that migrate from the adjacent sea to the estuary and rivers for spawning. After spawning, the juveniles remain in the rivers and estuary for few months...
Article
This study investigates the spatio-temporal variability of tidal velocities in the Sundarban River System. The industry standard numerical tool MIKE 21 Flow Model was applied to simulate tidal velocities in the river system. Bathymetry data from GEBCO (https://www.gebco.net/) and surveyed bathymetry were used in model construction. The tidal veloci...
Article
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The Indian Sundarbans, together with Bangladesh, comprise the largest mangrove forest in the world. Reclamation of the mangroves in this region ceased in the 1930s. However, they are still subject to adverse environmental influences, such as sediment starvation due to migration of the main river channels in the Ganges–Brahmaputra delta over the las...
Article
Numerous fresh and saline-water tropical aquaculture ponds that often can be significant sources super-saturation of CO2 towards the atmosphere are gradually increasing throughout the world. The role of salinity in regulating the chlorophyll-a and dissolved pCO2 in a freshwater aquaculture pond, situated in East Kolkata Wetlands, Eastern India, was...
Conference Paper
Nagaland, a north eastern state of India has been suffering from water crisis since decades. Water scarcity has become chronic and perennial in many districts like Wokha. We have estimated the surface water resource and ground water potential zones in Wokha with the integrated use of Landsat OLI, LISS IV and Sentinel-1A SAR data. Thematic maps of L...
Article
In this study statics-based textural analysis GLCM (Grey Level Co-occurrence Matrix) of high resolution L band SAR data from ALOS-2 of JAXA has been used to discriminate between lithological facies of the fold-thrust belt of Nagaland, India. Sandstones, shales, siltstones and clays have been separated in the analysis. Importantly, the lithological...
Article
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This study assessed the potential and demonstrated the applicability of hyperspectral images from AVIRIS-NG data in mapping the health condition of the Lothian Island estuarine mangrove forest with rich floral diversity for the years 2016 and 2018. Nine vegetation indices covering every aspect of the health status were considered and a weighted ove...
Article
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data were integrated into GIS-based modeling by a multi-criteria decision-making technique (analytical hierarchy process) to generate the habitat suitability maps of juvenile Hilsa. The model-derived information was verified with the indigenous knowledge of the fishers regarding the suitable habitat of juvenile Hilsa by conducting group discussions...
Chapter
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River Ichamati, the major provider of freshwater to the Sundarbans mangrove ecosystem flowing along the India-Bangladesh border now stands disconnected from its freshwater source. This study estimates the runoff volume of the river basin through a SWAT model to consider it's rejuvenation. A hypothetical channel-form for the disconnected part of Ich...
Chapter
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Climate risk to something of value is not uniform even in the same geography despite exposure to the same climate-related events or trends or their impacts. Therefore, decision-making on climate resilience is challenged by multiple variables. In the wake of a devastating event or a creeping process, decision on whether to rebuild and persist in sit...
Article
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The seasonal variability of the lateral flux of total alkalinity (TAlk) and dissolved inorganic carbon (DIC) of the tropical Hooghly estuary is analyzed in this work. In situ observations of water temperature, salinity, dissolved oxygen, TAlk, and pH were measured in four different stations of the Hooghly estuary. It was measured once every month d...
Article
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While material conditions of migrant populations on average tend to improve over time as they become established in new destinations, individual trajectories of material and subjective well‐being often diverge. Here, we analyse how social and environmental factors in the urban environment shape the subjective well‐being of migrant populations. We h...
Article
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A Spatial Decision Support System has been developed to analyze the specific problems related to water availability, agriculture and livelihood at 40 selected villages of Purulia and Bankura District. This micro-level analysis is crucial to farmers and various stakeholders to properly formulate strategies and reduce the vulnerability of the area to...
Article
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The paper through a critical appraisal of the agricultural practices in the Indian Sundarban deltaic region explores the tripartite problems of arsenic biomagnification, salinity of arable lands and ingress of agrochemical pollutants into the freshwater resources, which endanger the health, livelihood and food security of the rural population inhab...
Article
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Reduction in riverine freshwater supply due to climate change as well as anthropogenic activities are documented throughout the globe. How river discontinuity in upstream reaches and the subsequent reduction in freshwater influx alter inorganic and organic carbon dynamics in downstream estuaries adjacent to mangroves has been rarely reported. We in...
Article
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Globally, water bodies adjacent to mangroves are considered significant sources of atmospheric CO2. We directly measured the partial pressure of CO2 in water [pCO2(water)] and related biogeochemical parameters with high temporal resolution, covering both diel and tidal cycles, in the mangrove-surrounding waters around the northern Bay of Bengal dur...
Article
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The United Nations Sustainable Development Goals (SDGs) and their corresponding targets are significantly interconnected, with many interactions, synergies, and trade-offs between individual goals across multiple temporal and spatial scales. This paper proposes a framework for the Integrated Assessment Modelling (IAM) of a complex deltaic socio-eco...
Article
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In the present paper population structure of four commercially important fishes were studied, namely Tenualosa ilisha, Pampus argenteus, Scomberomorus guttatus and Osteogeneiosus militaris, in the Sundarban Estuary of the northern Bay of Bengal from June 2011 to March 2012. However, a thorough understanding of life history based on length and weigh...
Article
The first discovery of commercial hydrocarbon in India was in 1889 in a structural trap at Digboi in Assam. Ever since the discovery, geologists have mapped and modeled the subsurface structure of this 50 km long anticlinal fold-thrust belt. However, never before, the existence of a hanging wall syncline north of Jaipur anticline, near the Kusijan...
Article
Environmental change influences population movements at various temporal and spatial scales. Yet individual decisions to migrate involve multiple motivations including perceived environmental risks and economic opportunities. We analyze how perceptions of environmental risks affect migration decisions and future migration intentions. We use cross-s...
Article
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Selective accumulation of heavy metals in mangrove plant parts have been reported earlier; however, varying heavy metal accumulation in the sediments adjacent to different mangrove plant species is rarely reported. We hypothesized that the pattern of heavy metal accumulation could vary in the adjacent sediments of different mangrove plant species....
Article
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Changes in dynamics of nutrient with respect to partial pressure of dissolved CO 2 [pCO 2 (water)] from tropical lotic ecosystem, namely diamond harbor an end member of Hugli estuary, were analyzed by way of a microcosm experiment. Though surface waters behaved as an extensive CO 2 source under in-situ condition [in-situ pCO 2 (water) ranged from ~...
Article
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The Purulia district of West Bengal is mostly a hard rock terrain of undulating topography with average elevation of 228 metres and the soils have low water retention capacity. Purulia is vulnerable to droughts, which is a common and recurring phenomenon in this district. With inadequate water resources to meet the demand of the district, agricultu...
Article
The coastal areas of the Ganges-Brahmaputra-Meghna delta are acknowledged hotspots of environmental and social concerns. This reflects a large, mainly rural population of 56.7 million, which is exposed to a range of natural hazards exacerbated by climate change, sea-level rise and subsidence. There are high levels of poverty and limited social well...
Article
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Application of remote sensing makes the assessment and monitoring of mangroves both time and cost-effective. In this study, the capacity of AVIRIS-NG data in discriminating different mangrove species of Lothian Island of Indian Sundarbans has been evaluated and compared with hyperspectral (Hyperion) and multispectral dataset (Landsat 8 OLI and Sent...
Article
Monthly catch of Hilsa in the Northern Bay of Bengal was modeled and predicted using the Bayesian structural time series (BSTS) with chlorophyll and rainfall as explanatory covariates. Chlorophyll and rainfall were used in the model with a lag time of eleven months and one month, respectively. These lag time values were determined from the explorat...
Article
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Urbanized rivers flowing through polluted megacities receive substantial amount of carbon from domestic sewage and industrial effluents which can significantly alter the air-water CO2 flux rates. In this regard, we quantified the partial pressure of CO2 in the surface water (pCO2(water)), air-water CO2 fluxes, and associated biogeochemical paramete...
Article
The Sundarban Biosphere Reserve (SBR) of India lies in the southwestern part of the Ganges Brahmaputra delta. The SBR, traversed by tidal creeks and rivulets, suffers perennially from the scarcity of freshwater in spite of heavy precipitation in monsoon months. Rivers in Sundarbans are saline in nature with brackish groundwater in the subsurface. F...
Article
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The term ‘vulnerability’ is used to examine the interlinkages between humans and their social and physical surroundings. This approach is similar to the IPCC AR4's (2007) conceptual framework of vulnerability to climate change. The IPCC AR5 (2014) introduces a new approach and terminology that is in line with the concept of risk, thus differing fro...
Article
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Aquaculture practices are steadily increasing to meet the fish demand, especially in tropical countries like India. However, efforts to characterize the contribution of these aquaculture ponds towards greenhouse gas emission like CH4 are still very few. CH4 concentration in water [pCH4(water)] and air–water CH4 fluxes were estimated (during the sum...
Conference Paper
The United Nations Sustainable Development Goals (SDGs) promote sustainable development and aim to address multiple challenges including those related to poverty, hunger, inequality, climate change and environmental degradation. Interlinkages between SDGS means there is potential for interactions, synergies and trade-offs between individual goals a...
Article
The study covers two important deltaic systems of the north-east coast of India, viz. the Bengal and Mahanadi delta that support about 1.25 million people. The changes in potential marine fish production and socio-economic conditions were modelled for these two deltas under long-term changes in environmental conditions (sea surface temperature and...
Article
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Tropical sewage-fed aquaculture ponds of East Kolkata Wetlands (EKW), a Ramsar site, act as deposition center of organic matter and nutrient-rich sewage from the Kolkata metropolis, which in turn is utilized as fish feed in aquaculture ponds. Increasing nutrient load due to multifarious anthropogenic activities usually alters the chlorophyll-a (chl...
Article
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Locating potential zones of ground water reservoir is a challenging task particularly in dry areas, mountaneous region or lateritic zones. In the present century, Satellite Remote sensing could offer a fresh promise to identify surface and sub-surface water resources with less time and cost. The present study was carried out in the drought-prone re...
Chapter
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What are the possible trajectories of delta development over the coming decades? Trajectories will be determined by the interactions of biophysical trends such as changing sediment supplies, subsidence due to compaction of sediment and climate change, along with key socio-economic trends of migration and urbanisation, agricultural intensification,...
Chapter
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Deltas exemplify trends of great acceleration in the Anthropocene, including the shape of demographic and mobility transitions. The human core of the Anthropocene involves three principal phenomena: Increased human health evident at the population scale; movement of people to urban settlements; and growth in aggregate populations. Based on this res...
Chapter
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The Mahanadi Delta in the Anthropocene is characterised by a reduction in sediment supply and coastal retreat, both related to human interventions. Land loss is accompanied by population growth, extreme pollution, growth of urban centres and aquaculture, at the expense of pristine mangrove forest and agricultural land. Along with increasing inciden...
Chapter
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The world’s deltas are facing a sustainability crisis, with many at high risk of being ‘drowned’ as a result of relative sea-level rise. The only factor that can potentially offset relative sea-level rise is the deposition of fluvial sediment on the surface of deltas. As a result, an understanding of trends in fluvial sediment supply to deltas is c...
Article
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The population structure of Hilsa Shad (Tenualosa ilisha), a choicest table fish, in the estuaries of India, Bangladesh and Myanmar of Bay of Bengal has been studied by different methods and each provided complementary data on population structure. Considering the present scenario of climate change, increasing pollutant load in Indo-Bangladesh estu...
Article
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Reproduction and distribution patterns of Sardinella fimbriata had responded differently to oceanographic changes in various parts of the world. This is the first report investigating the effects of oceanographic parameters on the maturation and spawning of S. fimbriata in the northern part of Bay of Bengal. Monthly precipitation rate, sea surface...
Preprint
Full-text available
Globally, water bodies adjacent to mangroves are considered sources of atmospheric CO2. We directly measured the partial pressure of CO2 in water, pCO2(water), and other related biogeochemical parameters with very high (1-min) temporal resolution at Dhanchi Island in India’s Sundarbans during the post-monsoon season. We used elemental, stable isoto...
Conference Paper
The Sundarbans, a world heritage site in India, is world’s largest inter-tidal delta region containing huge areas of mangrove forests, and lies between India and Bangladesh. The site is intersected by a complex network of tidal waterways, mudflats and small islands of salt-tolerant mangrove forests. The eco-geography of this area is totally depende...
Article
The Sundarbans, abutting the Bay of Bengal is home to about 7.2 million people; about 2.7 million in Bangladesh and the rest in India. Due to global warming the region is experiencing rise in sea surface temperature and sea level, increasing frequency of severe storms, and consequently, net land loss. What choices do communities and administrations...
Article
Full-text available
Assessment of the role of estuarine-carbon fluxes is essential to improve the estimates of global carbon budget. Dissolved organic matter (DOM) plays an important role in aquatic carbon cycling. Chromophoric fraction of DOM (CDOM) is considered to be the major component of the dissolved natural organic matter (DNOM) in natural waters. CDOM also has...
Article
Hilsa (Tenualosa ilisha) is an important commercial fish in India. This study investigates relationships among Hilsa catch per unit effort (CPUE) and the corresponding lunar phase, rainfall variability, wind vector, and month in the northern Bay of Bengal. Hilsa catch during the monsoon season of three consecutive years (2013–2015) was analyzed by...
Article
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Optically active substances (i.e. chromophoric dissolved organic matter (CDOM), total suspended matter (TSM), chlorophyll-a (Chl-a)) and other physico-chemical parameters were measured in the coastal sea off Indian Sundarban during October 2016–January 2017. The present study, firstly, portrayed the vertical distribution of optically active substan...
Article
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ARTICLE INFO ABSTRACT East Kolkata Wetland (EKW) is an urban or peri-urban wetland located on the outskirts of the Kolkata City which performs multi-facet activities, carbon sink being one of them. The raw waste from the city is naturally treated in this wetland system, however, the aquaculture ponds situated in these wetlands which make use of thi...
Article
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This is the first report to assay the heavy metal accumulation in Blue Swimmer Crab in the northern Bay of Bengal. The present study finds that copper (Cu) concentration though has been the highest compared to the other metals, particularly in the gill. Cadmium (Cd) and lead (Pb) have high affinity to be concentrated in Hepatopancreas all through t...