Neap—spring variability of internal waves over the shelf-slope along western Bay of Bengal associated with local stratification     

Himansu K. Pradhan  A. D. Rao  Madhu Joshi 《Natural Hazards》2016,80(2):1369-1380

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An assessment of Dungale landslide using remotely piloted aircraft system (RPAS), ground penetration radar (GPR), and Slide & RS2 Softwares     

Tandon  Ruchika Sharma  Gupta  Vikram  Venkateshwarlu  Bhimala  Joshi  Pradeep 《Natural Hazards》2022,113(2):1017-1042

Natural Hazards - In the present study, slope stability analysis was done using limit equilibrium method and finite element method of the Dungale landslide situated in the NW Himalaya along Tons...  相似文献   

A multi-model decision support system (MM-DSS) for avalanche hazard prediction over North-West Himalaya     

Kaur  Prabhjot  Joshi  Jagdish Chandra  Aggarwal  Preeti 《Natural Hazards》2022,110(1):563-585

Natural Hazards - Avalanche forecasting is carried out using physical as well as statistical models. All these models have certain limitations associated with their mathematical formulation that...  相似文献   

Extragalactic survey using GALEX–spitzer matching fields     

Lakshmi S. Bose  N. V. Sujatha  K. Narayanankutty  Jayant Murthy 《Astronomy Letters》2015,41(12):704-711

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Hydrology and nutrient dynamics of spring of almora-binsar area, indian central himalaya: Landscapes, practices, and management     

B. K. Joshi 《Water Resources》2006,33(1):87-96

The study aims to measure the hydrological behavior and nutrients dynamics of the springs located in different landscapes of Kosi basin, Indian central Himalaya. A total number of eight springs were considered for the present investigation, each landscape represented by one spring. The monitoring for hydrological measurement was conducted in January 1998 to December 1999, the interval between two successive measurements was 10 days, i.e., 240 hr (total 72 observations were made). Water quality measurement was done in three main seasons, i.e., winter (Jan.), summer (June) and monsoon (Aug.) of 1998 and 1999, and the average value for measured parameters were calculated. These samples were analyzed for pH, electrical conductivity, total dissolved solids, dissolve oxygen, Ca^2?, Mg^2?, Na^?, Cl^?, F^?, NO ₃ ^? , and SO ₄ ^2? . Hydrology of spring’s water showed that the reserve forest has a higher water retention capacity than the other landscapes, and the spring recharge capacity highly influenced by the settlements, open grazing, mismanaged agricultural and deforestation activities. The spring water chemistry shows that the springs located in forest and sparsely populated areas have lower EC, TDS, cationic and anionic concentration and are safe for drinking purposes, but those in irrigated land and densely populated areas feature higher EC, low dissolved oxygen concentration and higher NO ₃ ^? , which makes the water of these springs unsuitable for drinking. F concentration was higher in the springs located in the settlement area. In brief, the study indicates that the unmanaged drains, very poor and old pattern of sewage disposing system result in an increase in Na^?, Cl^?, F^?, NO ₃ ^? , and SO ₄ ^2? concentration as compared to the springs in agricultural and forested areas. All of the studied springs are badly managed which a is great threat for the longevity and quality of the water bodies, in particular, in Indian Central Himalayan region. This study suggests the ways of the constructional works, grazing. Forest resource extraction and agricultural activities in water bodies catchments area should also be controlled.  相似文献   

Mechanisms for the land/sea warming contrast exhibited by simulations of climate change   总被引：3，自引：3，他引：0  

Manoj M. Joshi  Jonathan M. Gregory  Mark J. Webb  David M. H. Sexton  Tim C. Johns 《Climate Dynamics》2008,30(5):455-465

The land/sea warming contrast is a phenomenon of both equilibrium and transient simulations of climate change: large areas of the land surface at most latitudes undergo temperature changes whose amplitude is more than those of the surrounding oceans. Using idealised GCM experiments with perturbed SSTs, we show that the land/sea contrast in equilibrium simulations is associated with local feedbacks and the hydrological cycle over land, rather than with externally imposed radiative forcing. This mechanism also explains a large component of the land/sea contrast in transient simulations as well. We propose a conceptual model with three elements: (1) there is a spatially variable level in the lower troposphere at which temperature change is the same over land and sea; (2) the dependence of lapse rate on moisture and temperature causes different changes in lapse rate upon warming over land and sea, and hence a surface land/sea temperature contrast; (3) moisture convergence over land predominantly takes place at levels significantly colder than the surface; wherever moisture supply over land is limited, the increase of evaporation over land upon warming is limited, reducing the relative humidity in the boundary layer over land, and hence also enhancing the land/sea contrast. The non-linearity of the Clausius–Clapeyron relationship of saturation specific humidity to temperature is critical in (2) and (3). We examine the sensitivity of the land/sea contrast to model representations of different physical processes using a large ensemble of climate model integrations with perturbed parameters, and find that it is most sensitive to representation of large-scale cloud and stomatal closure. We discuss our results in the context of high-resolution and Earth-system modelling of climate change.  相似文献   

Occurrence of Proterozoic black shale-hosted uranium mineralisation in Tal Group,Sirmour district,Himachal Pradesh     

T. P. S. Rawat  G. B. Joshi  Bhaskar Basu  Nurul Absar 《Journal of the Geological Society of India》2010,75(5):709-714

Black shale type uranium deposits, though of low grade (<0.001 to 0.05% U₃O₈), contain large uranium resources because of their immense volume. The Neoproterozoic-Cambrian Krol-Tal Himalayan sequence covering a cumulative area of about 1000 sq km in five different synclinal basins from Sirmour district, Himachal Pradesh in the west to Nainital district, Uttar Pradesh in east contain such black shale horizons. The uranium mineralisation found in black shale in the Nigalidhar syncline of Himachal Pradesh and its implication of being an indicator for search of such uranium deposits in Himalayas is discussed.  相似文献   

Estimation of infiltration rate,run-off and sediment yield under simulated rainfall experiments in upper Pravara Basin,India: Effect of slope angle and grass-cover     

Veena U. Joshi  Devidas T. Tambe 《Journal of Earth System Science》2010,119(6):763-773

The main objective of this study is to measure the effect of slope and grass-cover on infiltration rate, run-off and sediment yield under simulated rainfall conditions in a badland area located in the upper Pravara Basin in western India. An automatic rainfall simulator was designed following Dunne et al (1980) and considering the local conditions. Experiments were conducted on six selected experimental fields of 2 × 2m within the catchment with distinct variations in surface characteristics — grass-covered area with gentle slope, recently ploughed gently sloping area, area covered by crop residue (moderate slope), bare badland with steep slope, gravelly surface with near flat slope and steep slope with grass-cover. The results indicate subtle to noteworthy variations amongst the plots depending on their slope angle and surface characteristics. An important finding that emerges from the study is that the grass-cover is the most effective measure in inducing infiltration and in turn minimizing run-off and sediment yield. Sediment yields are lowest in gently sloping grass-covered surfaces and highest in bare badland surfaces with steep slopes. These findings have enormous implication for this area, because over 2/3 area is characterized by bare and steep slopes.  相似文献   

Use of objective analysis to estimate winter temperature and precipitation at different stations over western Himalaya     

Jagdish Chandra Joshi  Ashwagosha Ganju 《Journal of Earth System Science》2010,119(5):597-602

Temperature and fresh snow are essential inputs in an avalanche forecasting model. Without these parameters, prediction of avalanche occurrence for a region would be very difficult. In the complex terrain of Himalaya, nonavailability of snow and meteorological data of the remote locations during snow storms in the winter is a common occurrence. In view of this persistent problem present study estimates maximum temperature, minimum temperature, ambient temperature and precipitation intensity on different regions of Indian western Himalaya by using similar parameters of the neighbouring regions. The location at which parameters are required and its neighbouring locations should all fall in the same snow climatic zone. Initial step to estimate the parameters at a location, is to shift the parameters of neighbouring regions at a reference height corresponding to the altitude of the location at which parameters are to be estimated. The parameters at this reference height are then spatially interpolated by using Barnes objective analysis. The parameters estimated on different locations are compared with the observed one and the Root Mean Square Errors (RMSE) of the observed and estimated values of the parameters are discussed for the winters of 2007–2008.  相似文献   

Statistical analysis of Soft X-ray solar flares during solar cycles 21, 22 and 23     

Navin Chandra Joshi  Neeraj Singh Bankoti  Seema Pande  Bimal Pande  Wahab Uddin  Kavita Pandey 《New Astronomy》2010,15(6):538-546

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