Faculty Publications

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Browsing Faculty Publications by Subject "SOCIAL SCIENCES::Business and economics::Human geography, economic geography"

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    Coastal Regulation Zone and Human Intervention: A Case Study of Salcete Taluka, Goa, India
    (National Association of Geographers India (NAGI), 2024) Deshpande, Tanvi; Pardeshi, Sudhakar
    Coasts are the zone of various importance both naturally and economically. Goa is a famous tourist destination where most of the tourism is concentrated in the coastal areas. Though, it has economically benefited State’s economy but on the other hand, has given rise to haphazardous development within the coastal regulation zone which is threatening the fragile coastal ecosystem. The present study has attempted to highlight the human intervention along the coastal zone of Salcete taluka in South district of Goa. To study the human interference along the coast, two methods were implemented: i) sand dune profiling using dumpy level and ii) shoreline change analysis in Arc GIS software. About 14.65 km length of the shoreline of Salcete taluka shows accretion at Utorda, patches between Betalbatim and Colva, Sernabatim and Benaulim, Mobor and Betul. While 12.35 km length of the shoreline shows erosion along the beaches of Betalbatim, Colva, Benaulim, Varca and Cavelossim. Erosion might be associated with the interference of human in form of tourism and other activities taking place along the beach. The overall study stresses upon the problems due to human intervention and urgent need to formulate rules and policies to regulate, prevent and restore the fragile coastal ecosystem from further devastation.
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    Mangrove Ecosystem Mapping using Sentinel-2 and Segmentation Technique
    (Kalpana Corporation, 2023) Deshpande, Tanvi; Kerkar, Pravina
    Mangroves are important forest ecosystems located between land and sea. They act as storehouses of biodiversity, carbon assimilators, help in nutrient cycling and provide breeding grounds for various organisms. The present study was carried out with the aim to estimate the current mangrove cover in various estuaries of Goa. The objective of the paper is to map and record the current distribution and density of mangroves using remote sensing data and geospatial techniques. The study incorporated use of OBIA segmentation technique to delineate and map mangroves. Kappa coefficient and accuracy assessment were carried out for validation, the results for which showed strong level of agreement. From the results, it was found that the mangrove cover in Goa has increased to 53.32 km2. Largest mangrove cover exists in Mandovi-Zuari-Cumbarjua estuarine complex, consisting of 81.25% of mangrove cover in Goa. The increase in mangrove cover can be associated with natural regeneration. Further, NDVI was calculated to study the density of mangroves. Considering the densitywise mangrove distribution, area under dense mangrove category is 10.13 km2 (18.99%), area under moderate dense category is highest, that is 36.99 km2 (69.37%) and area under sparse category is 6.2 km2 (11.62%).
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    Spatio-temporal analysis of shoreline and migration of mangroves- A case study of Mandovi and Zuari estuaries including Cumbarjua Canal, Goa (2002-2022)
    (World Researchers Associations, 2024) Deshpande, Tanvi; Kerkar, Pravina
    Mangroves are halophytes that are usually found in the inter-tidal regions in tropical and subtropical regions. Lush green and prominent patches of mangroves are found in Goa, especially in the Mandovi-Zuari-Cumbarjua estuarine complex. The present study aims to assess the shoreline changes along the selected estuaries of Goa and to study the landward migration of mangroves. OBIA Segmentation techniques have been implemented to map mangrove ecosystems over 20 years. From the spatio-temporal analysis (2002-2022), landward migration of mangroves has been observed in the selected estuaries-Mandovi and Zuari including Cumbarjua canal. To further understand the landward migration of mangroves, shoreline analysis has been carried out using DSAS tool. DSAS analysis has been carried out with respect to EPR as it is easy for computation and requires shorelines of two time periods for analysis. From shoreline analysis, it has been understood that the accretion rate is dominant over the erosion rate. Overall, it has been observed that there is accretion and landward migration of mangroves, which can be attributed to the landward shift of mangroves irrespective of rise in sea level if there is availability of adequate sediment and landward space. Also availability of sediments resulting from heavy rainfall and runoff leads to sedimentation and allows growth of mangroves.