DSpace Collection:

Multi-temporal Analysis of Sentinel 2B Satellite Images for Identification of Paddy Crop in South Gujarat, India

2025-07-08T23:22:36Z

Title: Multi-temporal Analysis of Sentinel 2B Satellite Images for Identification of Paddy Crop in South Gujarat, India Authors: Ghosh, Tathagata; Saha, Sukanta Kumar; Kanchan, Rolee Abstract: Agriculture as a primitive economic activity has changed its nature to great extent over the time period. Increasing needs as well as variability of need are the some of the major cause behind such change. To keep pace with this kind of dynamic scenario, it is essential to closely monitor the agricultural activity. Looking at the vastness of the agriculture-based country like India, timely generation of agricultural data is a matter of great concern for further necessary action and plans. Appropriate application geospatial technology combined with field observation can significantly assist to attain the objective. In the present work, Valsad district of south Gujarat is taken into consideration for the evaluation. The main objective of the paper is to identify the paddy crop through geospatial technique in association with the traditional field observation. For the extraction of paddy crop multi-temporal Sentinel 2B satellite images were used. Normalised Differential Vegetation Index (NDVI) helped in the process to extract the paddy crops in the study area with 77.42% accuracy level. Description: PP : 1-14

Gender Disparity in Literacy Rate and Its Association with Work Participation: A Geographical Enquiry

2025-07-08T23:22:24Z

Title: Gender Disparity in Literacy Rate and Its Association with Work Participation: A Geographical Enquiry Authors: Modak, Partha; Mandi, Susanta; Bera, Pradyut; Ruhidas, Padma; Ganguli, Malay; Mandal, Mrinal Abstract: The gender disparity in literacy rate is a significant parameter in understanding the overall educational level and work participation rate. In this study, gender disparity in literacy rate has been computed for Purulia district, one of the backward districts of West Bengal, to portray the gender disparity in literacy rate (GDLR) in 2001 and 2011 and its spatial distribution across the district. The result shows that Purulia district stands second and last in terms of gender disparity index (GDI) in 2001 (0.417) and 2011 (0.276), respectively, in West Bengal. The paired t-test reveals a significant difference (p< 0.025) in the GDI of literacy rate between the 2001 and 2011 census years. The district experienced a higher rate of dependency ratio of population in 2001 (74.95%) and 2011 (65.98%), which was more than the state average. Moreover, the correlation value of the percentage of literacy and work participation rate of the female population is calculated to be – 0.62 in 2001 and – 0.37 in 2011. Most of the district's people are marginal workers and mainly engaged in the agricultural sector as low-wage labourers. The district needs more employment opportunities to enjoy a good quality of life. Description: PP : 15-33

Hydrogeochemistry of fluoride concentration in groundwater and human health risk assessment: A study from some parts of Rarh Bengal, Eastern India

2025-07-08T23:22:13Z

Title: Hydrogeochemistry of fluoride concentration in groundwater and human health risk assessment: A study from some parts of Rarh Bengal, Eastern India Authors: Khan, Ulfat; Rudra, Somnath Abstract: Excess fluoride (F-) in drinking water results in serious health risks in many parts of the world as well as western parts of Rarh Bengal, India. The current study was carried out to investigate the relationship between fluoride and other physiochemical parameters, as well as to assess the health risk of residents of the Simlapal Block, Bankura District. In this study, 26 water samples collected from the five highly fluoride-contaminated villages were tested for fluoride and other chemical characteristics. The result shows that fluoride correlates considerably negatively with Na (-0.07), Ca (-0.12), Cl (-0.19), Mg (-0.10), and SO4 (-0.09) but significantly positively with pH (0.88), TDS (0.82), EC (0.98), TH (0.89), K (0.19), and HCO3 (0.91). Based on the geochemical classification of groundwater, the three main hydro-chemical facies are Ca-Cl, Na-HCO3, and NaHCO3-Ca. The Gibbs diagram demonstrates that rock water interaction and evaporation are the primary controlling mechanisms for adjusting the water quality in this hard rock aquifer. Notably, 85 percent of water samples revealed fluoride concentrations over the permitted limit of 1.5 mg/L. The study found that the groundwater fluoride content in the area ranged from 2.93 mg/L to 10.51 mg/L, resulting in dental, skeletal, and other fluorosis. Children and teenagers are more vulnerable to fluoride poisoning than adults, according to the hazard quotient of fluoride (HQFluoride) index. To provide clean drinking water and lower the risk of fluorosis, meticulous planning is necessary. Findings of this research and recommendation may be useful for planners and policy makers for providing public health facilities in the areas. Description: PP : 34-64

A Spatial Analysis of Sediment Connectivity of Ranikhola River System in Sikkim Himalaya, India

2025-07-08T23:22:01Z

Title: A Spatial Analysis of Sediment Connectivity of Ranikhola River System in Sikkim Himalaya, India Authors: Mandal, Debasish; Biswas, Akash; Das, Mantu; Pradhan, Manabendra; Saha, Snehasish Abstract: The concept of sediment connectivity refers to the degree of linkage between sediment sources and downstream areas. It is mainly affected by the longitudinal (dis)continuity of channels associated with depressions and confluences along the channel, and it represents variations in the balance between the sediment load and the transport capacity of the channel along a line. This study analyzed the stream channels as pathways and sinks of runoff carried with sediment along a mountainous catchment. The aim of this study was to investigate the effect of streams on connectivity and the linkage between sediment source area, stream network and outlet, and their contribution to sediment connectivity patterns in the mountainous catchment. In addition, to validate the output through field investigation at specific locations considering the degree of (de)connectivity. The index of sediment connectivity (IC) is used to analyze the sediment connectivity in the study area. The shape of the glacier cirque significantly influences the connectivity in the upper hanging valleys (Messenzehl et al., 2014). IC decreases when channels are considered conduits and sinks for sediment-loaded runoff, particularly on upper hill slopes. The map shows that the closer the distance to the channels, the more significant impact on the IC. The IC channels map showed the areas closer to the main channel have high IC values (1.160 to - 0.608), while sub-catchments and steep hill slopes have low values (- 5.912 to -7.680). On the other hand, it is evident from the IC Outlet that the upper Ranikhola region has a low IC value (i.e. -9.21), while the lower reach of the main channel receives a high value (i.e. 2.14). So, there was a striking difference between the IC channel and the IC outlet value for the Ranikhola basin. The formation of the flat regions on steep slopes caused by terrace farming typically reduced connectivity, although, at some locations, topographic convergence brought about by terraces enhanced connectivity. In the river bed, the presence of an excessive range of loads, ranging from coarser particulate matters to erratics with a mean load diameter size of 6 to 7 feet (6 ft., which indicates medium to larger monolithic deposits), and boulders that are commonly found to be coarse to very coarse in size (ranging from approximately 6.56 metres to 13.12 metres in length), makes it easier for sand to become trapped. This study also revealed that this model is helpful when understanding the sediment movement in a catchment situated at the foothills of the mountain. However, in this context, systematic field investigation was complex to uncover the links between hill slopes and river networks. Description: PP : 65-98