Prediction of Heatwave 2013 over Andhra Pradesh and Telangana, India using WRF Model

N. Naveena,G. Ch. Satyanarayana,A. Dharma Raju,N. Umakanth,D. Srinivas,K. Sivasankar Rao,M. Suman 한국대기환경학회 2021 Asian Journal of Atmospheric Environment (AJAE) Vol.15 No.3

Heatwaves are acknowledged to be the major meteorological disaster, causing a noticeable impact on humans and animals’ lives during the last few decades. The number, frequency, duration, intensity, and areal extent of the heatwaves are on the rise during recent years. The Maximum temperature data of 2013 is analyzed to assess the synoptic nature, intensity, frequency, and various significant facets of the heatwave over the south peninsular states of Andhra Pradesh and Telangana. Indian subcontinent experienced a major heatwave during 2013, which claimed 1216 human lives. Even though the highest intensity of maximum temperatures is observed in May over major areas of India, the increasing (incidence, duration, number of spells, and the sweltering temperatures) number of heatwaves are observed over many parts of the country. The northwest and southeast coastal regions are the two heat wave prone regions. The advection of heat from the northwest with the aid of north-westerly winds causes heatwaves over northwest India to sweep or move towards India’s southeast and east coast. The heatwave record over south-eastern India, i.e, Andhra Pradesh and the adjoining Telangana state during May 22-24, 2013 were described in this study. Maximum temperatures above 40°C are observed with a sudden rise by 6 to 7°C over the study region. An attempt is made to predict the maximum temperatures 72 hours before the existence of a heatwave at 3 km horizontal resolution using the Advanced core of the Weather Research and Forecasting (WRF) model. Model predicted temperature values match with observations and the statistical metrics show a high index of the agreement, lower values for root-mean-square error and mean absolute error. Atmospheric circulation patterns associated with this heatwave are also presented. The arrest of sea breeze, the hovering of diabatic heat because of subsidence is the factor that abetted the heatwave blockade over the south-eastern part of the country. The WRF model forecasts could present the occurance of the heat wave over AP and Telangana region with 72 hour lead time with high accuracy.

In Vitro Clonal Propagation of Chlorophytum Borivilianum

B N. Maruthi Prasad,B N. Satyanarayana,Nagarajappa Adivappar,B G. Hanumantharaya 한국원예학회 2006 한국원예학회 기타간행물 Vol.- No.-

Effect of Overlapping Friction Stir Processing on Microstructure, Mechanical Properties and Corrosion Behavior of AA6061 Alloy

Marukurti V. N. V. Satyanarayana,Kumar Adepu,Karan Chauhan 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.9

The present work studies the influence of five-pass overlapping friction stir processing (FSP) on microstructure, mechanicalproperties and corrosion behavior of AA6061 alloy. The fine equiaxed grains were produced in large-area stir region ofoverlapping FSP and it was identified that the grain size of each overlapping pass is uniform in large area stir region (averagegrain size = 3.9 ± 3.5 μm). The five-pass overlapping FSP resulted in ductility enhancement while the strength remainedinferior to that of parent metal due to thermal softening during FSP. On the other hand, corrosion resistance greatly improvedafter FSP due to the formation of a homogenous fine-grained structure and discontinuous precipitates.

Surface Energy and Radiation Budget over a Tropical Station: An Observational Study

Bhishma Tyagi,A.N.V. Satyanarayana,Manoj Kumar,N.C. Mahanti 한국기상학회 2012 Asia-Pacific Journal of Atmospheric Sciences Vol.48 No.4

This study attempts to understand the variations in the radiation and surface energy budget parameters during days of occurrence and non occurrence of convective activity such as thunderstorms at Ranchi (23o25’N, 85o26’E), India using the special experimental data sets obtained during pre-monsoon month of May,2008. For this purpose five continuous thunderstorm days (TD) of varying intensity, along with three non-thunderstorm days (NTD)preceding the TD are considered. Thunderstorms occurred at site are multi-cellular in nature. Change of wind direction and strong gusty winds are noticed in TD cases. Pre-dominant wind direction is south westerly for the TD; it is northwesterly during NTD. Sudden drop of air temperature and rise of relative humidity and rise/drop in atmospheric pressure is noticed during TD are found to be proportional to the intensity of thunderstorm event. More partitioning of net radiation (QN) is in to latent heat flux (QE) and the contribution of sensible heat flux (QH) and soil heat flux (QG) are same during TD. But in the NTD more partitioning of QN is in to QH followed by QG that of QE. Significant differences in radiation and energy budget components are noticed during TD and NTD events.

Response of Upper Ocean and Impact of Barrier Layer on Sidr Cyclone Induced Sea Surface Cooling

Naresh Krishna Vissa,A.N.V. Satyanarayana,B. Prasad Kumar 한국해양과학기술원 2013 Ocean science journal Vol.48 No.3

In the present study an attempt has been made to investigate the impact of salinity stratification on the SST during the tropical cyclone (TC) passage. In this context, a severe post monsoon cyclone, Sidr, (Category 4) that developed over the south-eastern Bay of Bengal (BoB) during 11-16 November, 2007 was chosen as a case study. Pre-existence of a thick barrier layer (BL), temperature inversions and a higher effective oceanic layer for cyclogenesis (EOLC) were noticed along the path of the Sidr cyclone. The analysis of available Argo floats along the Sidr cyclone track also revealed less cooling during as well as after its passage as was reported from satellite derived SST. The role of BL on Sidr induced sea surface cooling was investigated using a diagnostic mixed layer model. Model results also depict the reduced sea surface cooling during the passage of Sidr. This is attributed to the presence of BL which results in the inhibition of the entrainment of cool thermocline water into the shallow mixed layer. Climatological as well as in situ observations of tropical cyclone heat potential (TCHP) and EOLC shows that the Sidr cyclone propagated towards the regions of higher EOLC.

Assessment of Turbulent Kinetic Energy Budget and Boundary Layer Characteristics during Pre-Monsoon Thunderstorm Season over Ranchi

Bhishma Tyagi,A.N.V. Satyanarayana 한국기상학회 2013 Asia-Pacific Journal of Atmospheric Sciences Vol.49 No.5

In the present work turbulent kinetic energy (TKE) budget and boundary layer characteristics are studied for an Indian tropical station Ranchi (23o25N, 85o26E), situated over Chota Nagpur plateau. The pre-monsoon months (March-May) data for years 2008-2010has been used in the present study which is the period of severe thunderstorm over the North East India. TKE budget terms, dissipation rates, and normalized standard deviations of wind and temperature along with skewness of temperature have been analyzed to find out characteristic difference between days of thunderstorm and days of clear weather. Present study brought out significant variations in the turbulence transportation between the days of thunderstorm activity to that of fair weather days. Site and season specific relationships normalized standard deviations of wind and temperature with atmospheric stability during pre-monsoon thunderstorm and non thunderstorm days over Ranchi are proposed. One of the important outcomes of the study is proposing site specific relationships between TKE dissipation rates with respect to atmospheric stability. These results are useful in validating the mesoscale simulations of thunderstorm activity.

Competency Development in Urban Local Bodies for Implementing Public Private Partnership Projects in India

Devkar, Ganesh A.,Kalidindi, Satyanarayana N. Korea Institute of Construction Engineering and Ma 2013 Journal of construction engineering and project ma Vol.3 No.2

Weak competencies in urban local bodies (ULBs) for implementing public private partnership (PPP) projects has been recognized as a major hurdle in uptake of PPP model in India. In this context, a questionnaire survey was conducted to evaluate perception of urban PPP experts and ULB representatives on three aspects related to competency development, including, critical competencies for implementing urban PPP projects, approaches for competency development in ULBs and constraints faced by ULBs in development of competencies. The five critical competencies identified are project identification, project conceptualization, transaction design, PPP process management and contract management. The approach of training programs for municipal staff and elected representatives, and capacity building oriented technical assistance for implementing urban PPP projects have been preferred by survey respondents for competency development. The frequent transfer of municipal decision makers and low motivation among municipal staff have been identified as the most significant constraints for development of competencies.

Scheduling Tasks on Most Suitable Fault tolerant Resource for Execution in Computational Grid

Jairam Naik K,K. Vijaya Kumar,N. Satyanarayana 보안공학연구지원센터(IJGDC) 2012 International Journal of Grid and Distributed Comp Vol.5 No.3