Browsing by Author "Ashish Kumar Vishwakarma"

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Application of Visual MODFLOW in Groundwater Flow Modeling at the Left Crescent of the Ganga River, Varanasi, India
(Springer, 2021) Sachin Mishra; Shivam Tripathi; Dhanesh Tiwary; Anurag Ohri; Ashwani Kumar Agnihotri; Ashish Kumar Vishwakarma
Groundwater flow modeling is a significant tool for conceptualizing the hydro-geological processes and forecasting the groundwater pollution. To simulate the groundwater flow direction and pollutant fate, Visual MODFLOW and MODPATH are used popularly. Present study focuses on the application of Visual MODFLOW to study the groundwater flow direction, groundwater flow path lines and to predict the leachate contamination from the open unsecured MSW dumping site at the left crescent of the Ganga River in Varanasi, India. Simulation of the model is done for one year by giving input value to the flow setting and transport setting database of the software to know the groundwater flow direction and flow velocity in the study area. Linear isotherm (equilibrium-controlled) with no kinetic reactions is assumed for contaminants transport modeling. The simulated result indicates that the groundwater is flowing from higher heads (water table) to lower heads (towards Ganga River) in the study area. The maximum velocity of groundwater flow is calculated to be 5.7E-06 m/s (5.7 × 10−7 m/s). Simulated groundwater table was ranged from minimum 58 m to maximum 74.93 m. This result is validated with the field monitoring data of water table which was also observed to be between 61.96 m and 78.85 m. TDS transport model results indicate the movement of TDS pollutant towards the groundwater flow direction. TDS transport modeling showing a distinct pollutant path line from MSW dumping site to nearest observed heads (wells) and its path lines are congruent with the groundwater flow direction. This study would be helpful for site-suitability index for landfill strategy makers and the government authorities to safeguard groundwater pollution from potential risk from the landfill. © Springer Nature Singapore Pte Ltd. 2021.
Assessment of Impacts of Coal Mining–Induced Subsidence on Native Flora and Native Forest Land: A Brief Review
(wiley, 2020) Ashish Kumar Vishwakarma; Rajesh Rai; Ashwani Kumar Sonkar; Tusarkanta Behera; Bal Krishna Shrivastva
As compared to the surface mining, underground mining may has less impact on surroundings, but it results in land subsidence, and if it occurs in forest areas, then it may has a devastating effect on the forest land. Despite rising concerns for global food security and growing demand for coal production, less attention has been paid to the changes occurred in the soil of forest lands due to mining subsidence. The objective of this study is to scrutinize the existing information of the subsidence impact on forest lands. The literatures available internationally from journals and conferences were surveyed to review the various impacts of mining subsidence on forest land throughout the domain. The findings showed that there were quite a lot of impacts on the topography, hydrology, and soil properties. The effects were due to water logging, altered topography due to greater erosion, modified soil, and groundwater hydrology and generations of cracks or compactions that resulted in soil chemical and physical changes. The growth may also be reduced due to changes in the mining practices that are suited to subsided non-uniform landscapes. These multiple impacts need to be considered under local levels, with particular concern to the interaction of subsidence disturbances with the forest ecosystems. Therefore, proper adaptation strategies and future research directions need to be developed for such areas in the event of subsidence for the appropriate sustenance of healthy forest environments. © 2021 Scrivener Publishing LLC.
Delineation of groundwater potential zones in Singrauli coalfield using remote sensing, GIS and multi-influencing factor (MIF) techniques, India
(Springer Science and Business Media Deutschland GmbH, 2023) Ashwani Kumar Sonkar; Ramita Varshney; Ashish Kumar Vishwakarma; Aarif Jamal; Saurabh Kumar Barman
The present research was carried out for delineation of groundwater potential zones in the Singrauli coalfield utilizing combined application of remote sensing, GIS and multi-influencing factor techniques (MIF). The groundwater potential zones (GWPZ) were delineated using six thematic layers like lineament density, land use–land cover (LULC), geology, drainage, slope, and soil. Various tools of ArcGIS were used to digitize and convert these thematic maps into raster data. In addition to it, MIF technique was used to assign fixed score and weight to the components of these raster maps. Furthermore, each weighted thematic layer was statistically calculated to get the GWPZ. The obtained resulting GWPZ were classified into four classes, namely very good, good, very poor, and poor. The groundwater potential zone map indicated very good to good groundwater potential in the plains including cropland, while gentle to moderate slope was found in Talchir and Barakar formation as well as in the pediplains. The LULC, slope and geology have played a major role in the formation of very good groundwater potential zone. Poor to very poor groundwater potential was found in and around the mining area, forest/hilly area with a steep slope, metamorphic terrain and built-up area. These findings may further help the local authorities for enhancing groundwater resource planning in the study area. © 2023, The Author(s), under exclusive licence to Springer Nature Switzerland AG.
Impact assessment of coal mining induced subsidence on native soil of South Eastern Coal Fields: India
(Springer Science and Business Media Deutschland GmbH, 2020) Ashish Kumar Vishwakarma; Tusarkanta Behera; Rajesh Rai; Ashwani Kumar Sonkar; Anand Prakash Singh; Bal Krishna Shrivastva
Understanding the consequences of mining is most important in order to prevent negative outcomes for the environment as natural systems are used by humans for agriculture/silviculture. The present manuscript deals with the impact of subsidence due to underground coal mining on native soil. Depth-wise changes in soil texture and nutrient components in four layers; 0–15 cm, 16–30 cm, 31–45 cm and 46–60 cm were quantified along the subsidence prone land of the study area in top (within the extension zone; Zone I), middle (within inner-edge zone; Zone II) and bottom (around centre of the subsidence trough; Zone III) of a three and half year mining subsided land and compared it with soil texture and nutrient component status of an adjacent undamaged zone (UZ). An alteration in the Physicochemical characteristics of the soil after subsidence was observed. It had a positive impact on most of the soil characteristic parameters at Zone III. Available nitrogen, phosphorous and potassium (AN, AP and AK) were increased by 13.00%, 44.47% and 26.7%, respectively in 0–15 cm layer; 16.42%, 45.12% and 28.08%, respectively in 16–30 cm layer; 15.74%, 47.45% and 22.97%, respectively in 31–45 cm layer and 14.86%, 38.94% and 18.53%, respectively in 46–60 cm layer. A significant increase in silt + clay content, organic carbon and electrical conductivity were also reported. © 2020, Springer Nature Switzerland AG.