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Mahendra R.S.,Indian National Center for Ocean Information Services | Mohanty P.C.,Indian National Center for Ocean Information Services | Bisoyi H.,Indian National Center for Ocean Information Services | Kumar T.S.,Indian National Center for Ocean Information Services | Nayak S.,Ministry of Earth science MoES
Ocean and Coastal Management | Year: 2011

The current study area is coastal zone of Cuddalore, Pondicherry and Villupuram districts of the Tamil Nadu along the southeast coast of India. This area is experiencing threat from many disasters such as storm, cyclone, flood, tsunami and erosion. This was one of the worst affected area during 2004 Indian Ocean tsunami and during 2008 Nisha cyclone. The multi-hazard vulnerability maps prepared here are a blended and combined overlay of multiple hazards those affecting the coastal zone. The present study aims to develop a methodology for coastal multi-hazard vulnerability assessment. This study was carried out using parameters probability of maximum storm surge height during the return period (mean recurrence interval), future sea level rise, coastal erosion and high resolution coastal topography with the aid of the Remote Sensing and GIS tools. The assessment results were threatening 3.46 million inhabitants from 129 villages covering a coastal area 360km2 under the multi-hazard zone. In general river systems act as the flooding corridors which carrying larger and longer hinterland inundation. Multi-hazard Vulnerability maps were further reproduced as risk maps with the land use information. These risk caused due to multi-hazards were assessed up to building levels. The decision-making tools presented here can aid as critical information during a disaster for the evacuation process and to evolve a management strategy. These Multi-hazard vulnerability maps can also be used as a tool in planning a new facility and for insurance purpose. © 2011 Elsevier Ltd. Source

Kannan R.,Indian Institute of Technology Madras | Anand K.V.,Indian Institute of Technology Madras | Sundar V.,Indian Institute of Technology Madras | Sannasiraj S.A.,Indian Institute of Technology Madras | Rangarao V.,Ministry of Earth science MoES
ISH Journal of Hydraulic Engineering | Year: 2014

Shoreline movement is a complex phenomenon that is the result of both natural processes and man-made effects. Some of these processes occur over millennia; others are recent and may be cyclic. Understanding changes to the shore requires both a complete understanding of the underlying processes and an ability to accurately measure the changes. This paper presents the one-line shift method of determining datum-based shoreline positions for every month using Arc-GIS and sectional changes using data field measured data with the help of real-time kinematic GPS (RTK-GPS). This result shows the erosion and accretion patches and its volume for the study area. © 2013 © 2013 Indian Society for Hydraulics. Source

Mohanty P.C.,Indian National Center for Ocean Information Services | Mahendra R.S.,Indian National Center for Ocean Information Services | Bisoyi H.,CIFNET | Kumar Tummula S.,Indian National Center for Ocean Information Services | And 3 more authors.
European Journal of Remote Sensing | Year: 2013

Sea Surface Temperature (SST) derived from the NOAA AVHRR satellite data were used to generate the Degree of Heating Weeks (DHW) and Hot Spot (HS) products. Combination of the cumulative temperature anomalies and the thermal stress studies were yielded to synoptically identify the probable areas of bleaching. The bleaching status of the Andaman region was assessed based on the DHW and HS for the bleaching event occurred in the Andaman region in April/May 2005. The bleaching status up to Alert Level-1 was recorded with the maximum HS of 3°C and DHW 6°C-week. Simultaneous in-situ reef observations conducted in the Andaman Sea confirmed the coral bleaching event. The maximum mortality in the region due to coral bleaching was shown by the Acropora species (43%) followed by Montipora species (22%) and Porites species (14%). This study focused on detection of coral bleaching warning based on the SST in compliment with the in-situ observations. Source

Sharma J.,Institute of Seismological Research ISR | Chopra S.,Ministry of Earth science MoES | Roy K.S.,Institute of Seismological Research ISR
Bulletin of the Seismological Society of America | Year: 2014

A study of source, path, and site characteristics was conducted for the Uttarakhand Himalaya region using accelerogram data from 15 earthquakes (ML >3.5). These earthquakes were recorded at the 16-station accelerograph network operated by the Indian Institute of Technology, Roorkee, during 2005-2011. The average seismic moment (M0) of the studied earthquakes ranges between 1.20 × 1022 and 1.02 × 1024 dyn·cm, and the average moment magnitude (Mw) is between 4.0 and 5.3. The estimated corner frequency (fc) varies from 1.1 to 3.3 Hz, radius of rupture (rd) from 0.5 to 1.4 km, and stress drop (A Source

Mahendra R.S.,Indian National Center for Ocean Information Services | Mohanty P.C.,Indian National Center for Ocean Information Services | Srinivasa Kumar T.,Indian National Center for Ocean Information Services | Shenoi S.S.C.,Indian National Center for Ocean Information Services | Nayak S.R.,Ministry of Earth science MoES
Italian Journal of Remote Sensing / Rivista Italiana di Telerilevamento | Year: 2010

The study area coastal zone of Nellore district is experiencing frequent inundation by natural disasters. The current study is focused on generating Multi-hazard vulnerability map using the parameters historical storm surge heights, future sea level, future shoreline and high resolution coastal topography. The area is experiencing the severe coastal erosion up to 7 m/y along some stretches poses a threat. An area totaling 1708.36 sq. km. is found to fall under the multi-hazard zone and the coastal population are under threat due to future storms, erosion, accelerated sea level rise, etc. The image enhancement, interpretation and GIS overlay techniques along with data used here are effective to produce Multi-hazard vulnerability maps. These Maps are become vital tools for the coastal disaster management during an event and to take suitable decision on the future developments. Source

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