New approach of gradient profiling for tracking of low resistivity shallow fracture in hard rock area for groundwater exploration     

G. S. Yadav  Birendra Pratap 《Arabian Journal of Geosciences》2018,11(19):601

The resistivity survey for the study of subsurface hydrogeology is a continuously evolving science, which either adopts different techniques or combination of techniques to standardize the approach. The gradient profiling is done in the presence of horizontal electric field which is one of the techniques to locate the low resistivity response within the hard rock formations. This low is obtained due to presence of inhomogeneity in the host rocks. The attempt has been made to develop the concept of parallel gradient sub-profile, formulation and computation of geometrical factor, and demonstration through an actual field example in the hard rock area. The present study clearly shows that the region of low resistivity zone can easily be delineated to select a point for conducting geoelectrical sounding for knowing the information about its depth, thickness, and resistivity which are necessary requirements for ground water exploration. It can be inferred from the above study that parallel gradient sub-profile with respect to main gradient profile is useful tool for delineating low resistivity zone due to presence of fractured sandstone rocks saturated with groundwater which can be exploited.  相似文献   

Analysis of groundwater level trend in Jakham River Basin of Southern Rajasthan          下载免费PDF全文

Vinay Kumar Gautam  Mahesh Kothari  P.K.Singh  S.R.Bhakar  K.K.Yadav 《地下水科学与工程》2022,10(1):1-9

Groundwater accounts for about half of the water use for irrigation in India.The fluctuation pattern of the groundwater level is examined by observing rainfall replenishment and monitoring wells.The southern part of Rajasthan has experienced abrupt changes in rainfall and has been highly dependent on groundwater over decades.This study presents the impact of over-dependence on groundwater usage for irrigation and other purposes,spatially and temporally.Hence,the objective of this study is to examine the groundwater level trend by using statistical analysis and geospatial technique.Rainfall factor was also studied in groundwater level fluctuation during 2009-2019.To analyze the influence of each well during recharge or withdrawal of groundwater,thiessien polygonswere generated from them.In the Jakham River basin,75 wells have been identified for water level trend study using the Mann-Kendall statistical test.The statistics of trend analysis show that 15%wells are experiencing water level decline in pre-monsoon,while very low percentage of wells have such trend during post-monsoon season.The average rate of water level decline is 0.245 m/a in pre-monsoon and 0.05 m/a in post-monsoon.The aquifer recharge potential is also decreasing by year.it is expected that such type of studies will help the policy makers to adopt advanced management practices to ensure sustainable groundwater resource management.  相似文献   

Shifting paradigms for Nepal’s protected areas: history,challenges and relationships     

Babu R. Bhattarai  Wendy Wright  Buddi S. Poudel  Achyut Aryal  Bhupendra P. Yadav  Radha Wagle 《山地科学学报》2017,14(5):964-979

The modern history of protected area (PA) management in Nepal dates back to 1973 when the National Parks and Wildlife Conservation Act (1973) was promulgated and Chitwan National Park was established. In the years immediately following these key events, protected area acts and regulations were strictly applied and the role of local people in managing natural resources was neglected. However with the passage of time, and with changes in the socio-political and economic characteristics of Nepal, management regimes have shifted towards a more liberal model which recognizes more clearly the contributions of people living and working within protected areas. Recently, landscape level conservation models including the designation of multiple use areas have been utilized in the development of management plans for protected areas in Nepal. Conservation agencies have attempted to tackle challenges such as land use conflict, poaching and smuggling of wildlife parts and illegal harvesting of highly valued medicinal herbs through regulation, but these efforts are not always successful. We recommend a holistic conflict resolution approach which recognizes and resolves the different needs of all stakeholders.  相似文献   

Lockdown as an Empirical Strategy to Curb Air Pollution: Evidence from a Quasi-Natural Experiment     

Manish Yadav  Nitin Kumar Singh  Bhupendra Kumar Soni  Kusum Soni  Pawan Kumar Singh 《洁净——土壤、空气、水》2023,51(1):2200059

In this study, three approaches namely parallel, sequential, and multiple linear regression are applied to analyze the local air quality improvements during the COVID-19 lockdowns. In the present work, the authors have analyzed the monitoring data of the following primary air pollutants: particulate matter (PM₁₀ and PM_2.5), nitrogen dioxide (NO₂), sulfur dioxide (SO₂), and carbon monoxide (CO). During the lockdown period, the first phase has most noticeable impact on airquality evidenced by the parallel approach, and it has reflected a significant reduction in concentration levels of PM₁₀ (27%), PM_2.5 (19%), NO₂ (74%), SO₂ (36%), and CO (47%), respectively. In the sequential approach, a reduction in pollution levels is also observed for different pollutants, however, these results are biased due to rainfall in that period. In the multiple linear regression approach, the concentrations of primary air pollutants are selected, and set as target variables to predict their expected values during the city's lockdown period.The obtained results suggest that if a 21-days lockdown is implemented, then a reduction of 42 µg m⁻³ in PM₁₀, 23 µg m⁻³ in PM_2.5, 14 µg m⁻³ in NO₂, 2 µg m⁻³ in SO₂, and 0.7 mg m⁻³ in CO can be achieved.  相似文献   

Assessment of the Relative Largest Earthquake Hazard Level in the NW Himalaya and its Adjacent Region     

Theodoros M. Tsapanos  R. B. S. Yadav  Efthalia M. Olasoglou  Mayshree Singh 《Acta Geophysica》2016,64(2):362-378

In the present study, the level of the largest earthquake hazard is assessed in 28 seismic zones of the NW Himalaya and its vicinity, which is a highly seismically active region of the world. Gumbel’s third asymptotic distribution (hereafter as GIII) is adopted for the evaluation of the largest earthquake magnitudes in these seismic zones. Instead of taking in account any type of M_max, in the present study we consider the ω value which is the largest earthquake magnitude that a region can experience according to the GIII statistics. A function of the form Θ(ω, RP_6.0) is providing in this way a relatively largest earthquake hazard scale defined by the letter K (K index). The return periods for the ω values (earthquake magnitudes) 6 or larger (RP_6.0) are also calculated. According to this index, the investigated seismic zones are classified into five groups and it is shown that seismic zones 3 (Quetta of Pakistan), 11 (Hindukush), 15 (northern Pamirs), and 23 (Kangra, Himachal Pradesh of India) correspond to a “very high” K index which is 6.  相似文献   

Sustainability assessment of sodic land reclamation using remote sensing and GIS     

M. S. Yadav  P. P. S. Yadav  M. Yaduvanshi  D. Verma  A. N. Singh 《Journal of the Indian Society of Remote Sensing》2010,38(2):269-278

Sodicland reclamation in the Indo-Gangetic plains is being done on a large scale in the states of Uttar Pradesh, Punjab and Haryana in India. However, in certain areas, the reclamation has been reported to be unsustainable and the soils are reverting back to sodicity condition. A study was conducted in one of the reclamation sites of Etawah district for sustainability assessment of sodic land reclamation using remote sensing, Geographic Information system (GIS) and ancillary ground information. Multitemporal satellite data were used for delineation of reclaimed sodiclands and reverted sodic land. Field survey was conducted to find out the various causative factors. Groundwater level information and detailed field survey data were analysed in GIS environment. Results showed that in the reclamation site covering 3,905 ha. in 57 villages of the district, about 27 per cent of reclaimed lands were reverted to sodicity. High water table condition, improper drainage, nearness to canal (within 500 m), and hard pan in the sub-soil were found to be the reasons for unsustainability of reclamation.  相似文献   

Image quality characterization of fine resolution RISAT-1 data using impulse response function     

Gautam Dadhich  Shweta Sharma  Mihir Rambhia  Aloke K. Mathur  P. R. Patel  Alpana Shukla 《国际地球制图》2019,34(6):586-596

This study presents the results obtained from image quality assessment of Radar Imaging SATellite (RISAT-1). Image quality parameters such as spatial resolution, peak to sidelobe ratio (PSLR) and integrated sidelobe ratio (ISLR) are calculated by the analysis of impulse response function (IRF) of the point target. The study is carried out to assess temporal stability and consistency of image quality parameters obtained from analysis of IRF of 44 point targets. The results obtained from this study show that the mean values of the range and azimuth resolution are 2.048 ± 0.081 m and 3.383 ± 0.097 m for RH and 1.981 ± 0.081 m and 3.348 ± 0.076 m for RV, respectively. PSLR/ISLR values for RH channel are obtained as ?26.492 dB/?26.823 dB for azimuth and ?19.209 dB/?19.921 dB for the range. For RV channel, PSLR/ISLR values are ?26.300 dB/?27.572 dB for azimuth and ?19.146 dB/?19.827 dB for range.  相似文献   

Long-term earthquake forecasting model for northeast India and surrounding region: seismicity-based model     

Arabind Kumar Yadav 《Natural Hazards》2016,80(1):173-190

  相似文献   

Role of nonlinear localized structures and turbulence in magnetized plasma     

Neha Pathak  Nitin Yadav  R. Uma  R. P. Sharma 《Astrophysics and Space Science》2016,361(9):287

  相似文献   

A transitioning universe with anisotropic dark energy     

Anil Kumar Yadav 《Astrophysics and Space Science》2016,361(8):276

  相似文献