Geography - Research Publications

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    Frontal Changes of Gangotri Glacier, Garhwal Himalaya, between 1935 and 2022
    (Springer, 2023-02-07T00:00:00) Bhambri, Rakesh; Sain, Kalachand; Chand, Pritam; Srivastava, Deepak; Tiwari, Sameer K.; Yadav, Jairam Singh
    Gangotri Glacier is one of the most thoroughly investigated glaciers in the Indian Himalaya in terms of terminus monitoring. This study aims to update the frontal retreat of Gangotri Glacier between 1935 and 2022 using a large scale Geological Survey of India map, remote sensing images, and repeated photography. Gangotri Glacier�s retreat rate varied significantly during the study period. This glacier receded by 1727 � 51m (19.8 � 0.2 m a?1) between 1935 and 2022. The retreat of Gangotri Glacier decreased from 2001 to 2006 (7.0 � 4.0 m a?1) compared to the previous observation (1980�2001; 21.0 � 1.2 m a?1) but increased about three times between 2006 and 2017 (21.9 � 1.9 m a?1). Furthermore, from 2017 to 2022, the frontal retreat accelerated by about 1.5 times (33.8 � 6.7 m a?1) compared to the period between 2006 and 2017. The findings of the present study are consistent with ground based survey conducted by the Geological Survey of India. � 2023, Geological Society of India, Bengaluru, India.
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    Spatiotemporal dynamics of urban green and blue spaces using geospatial techniques in Chandannagar city, India
    (Springer Science and Business Media Deutschland GmbH, 2021-10-12T00:00:00) Ghosh, Pritha; Singh, Kiran Kumari
    Green and blue spaces are important landscape elements in a city and there is strong literary evidence available regarding the ecological, social, cultural and recreational benefits of these spaces to people and urban sustainability. Comprehensive quantitative assessment of these spaces is gaining scientific recognition for their utility in sustainable urban planning and drafting greening policies. This study analyzed the spatiotemporal change in urban green and blue spaces in Chandannagar city, India through quantitative assessment for the years 1991, 2001, 2011, and 2020 using Landsat data of 30�m spatial resolution. Normalized Difference Vegetation Index and Normalised Difference Water Index was applied to extract information on urban green and blue spaces. The classified maps were validated through field observations and Google earth images. Spatio-temporal analysis was carried out at ward level to analyze the distribution of urban green spaces (UGS) at the micro level. The result indicated that there was a reduction in green and blue spaces in the central and eastern parts of the city while there was a good amount of UGS in the western part of the city. The findings of this study shed light on important policy implications for the UGS planning in the city. � 2021, The Author(s), under exclusive licence to Springer Nature B.V.
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    Hydrological Characteristics of 7th February 2021 Rishi Ganga Flood: Implication towards Understanding Flood Hazards in Higher Himalaya
    (Springer, 2021-08-07T00:00:00) Rana, Naresh; Sundriyal, Yaspal; Sharma, Shubhra; Khan, Firoz; Kaushik, Sameeksha; Chand, Pritam; Bagri, Dhirendra Singh; Sati, Saraswati Prakash; Juyal, Navin
    A flash flood that originated from Raunthi Gad-a tributary of the Rishi Ganga river, in Garhwal Himalaya, caused unprecedented loss to lives and damaged two hydropower projects on 7th Februray 2021. In order to asses the flood magnitude, the flow parameters of the flood were calculated using the super-elevation of the flood marks preserved in the flood affected valleys. The textural characteristics of the flood deposits in the upper reaches of the valleys indicate dominance of debris flows. The peak discharge upstream of the confluence of Rishi Ganga and Dhauli Ganga was around 1.1�105 m3/s, which was four order of magnitiude higher than the normal peak discharge (? 3 m3/s). The flow achieved a velocity of 30�3 m/s. An exponential reduction in the flow velocity (from ?37 to 2 m/s) with distance is observed. For which the river gradient and increase in sediment load is implied flow that along its entrained way downstream between Raini and Tapovan. Considering the sensitivity of paraglacial zones to climate change, the paper calls for detailed studies pertaining to the response of paraglacial zones to extreme weather events. Importantly, it is necessary to have more hydrological data covering multiple valleys for predictive model simulation of the nature and magnitude of such disasters in future. � 2021, GEOL. SOC. INDIA.
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    Geospatial analysis of the distribution of urban green spaces: a study of four Indian cities
    (Routledge, 2021-07-27T00:00:00) Kaur, Navjotpreet; Kaur, Mandeep; Padhi, Saumya Sibani; Singh, Kiran Kumari
    The urban green spaces are immensely significant to ensure quality of life in a city. However, their spatial distribution is found to be inequitable. The study investigates spatial distribution of green space through remote sensing data at different times in four Indian cities. It further examines the distribution of urban parks with respect to the location of slums. The results demonstrate that green spaces in the study areas changed considerably in the last two decades. The public urban parks are far from slum areas, and their spatial distribution is inequitable. Urban green spaces should be considered a matter of environment justice. � 2021 Informa UK Limited, trading as Taylor & Francis Group.