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Diwakar, P. G.
- New Reports to the Flora of Andaman and Nicobar Islands, from Mahatma Gandhi Marine National Park, South Andaman
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Indian Forester, Vol 137, No 5 (2011), Pagination: 653-656Abstract
Eurya nitida Korth., Scurrula parasitica L. and Tristellateia australasiae A. Rich. collected from the Mahatma Gandhi Marine National Park South Andaman forms first reports to the flora of Andaman & Nicobar Islands. Descriptions, illustrations and note on their distribution are provided.Keywords
Andaman And Nicobar Islands, Eurya, Scurrula, Tristellateia
- Recollection of Cistachne tubulosa (Schrenk) Wight (Orobanchaceae) from Maharashtra after about a Century
Abstract Views :200 |
PDF Views:131
Authors
Affiliations
1 Botanical Survey of India, Western Circle, Pune-411 001, IN
1 Botanical Survey of India, Western Circle, Pune-411 001, IN
Source
Nelumbo - The Bulletin of the Botanical Survey of India, Vol 47, No 1-4 (2005), Pagination: 151-152Abstract
No Abstract.Full Text
- Leptopus sanjappae (Euphorbiaceae), a New Species from the Andaman Islands, India
Abstract Views :188 |
PDF Views:115
Authors
Affiliations
1 Botanical Survey of India, Andaman & Nicobar Circle, Port Blair - 744 102, IN
1 Botanical Survey of India, Andaman & Nicobar Circle, Port Blair - 744 102, IN
Source
Nelumbo - The Bulletin of the Botanical Survey of India, Vol 47, No 1-4 (2005), Pagination: 155-158Abstract
No Abstract.Full Text
- Eria extinctoria (Lindl.) Oliv. (Orchidaceae) - A New Record for India from Andaman & Nicobar Islands
Abstract Views :174 |
PDF Views:114
Authors
Affiliations
1 Botanical Survey of India, Andaman & Nicobar Circle, Port Blair- 744 102, IN
1 Botanical Survey of India, Andaman & Nicobar Circle, Port Blair- 744 102, IN
Source
Nelumbo - The Bulletin of the Botanical Survey of India, Vol 47, No 1-4 (2005), Pagination: 197-200Abstract
No Abstract.Full Text
- Notes on Medinilla Gaudich. (Melastomataceae) from Great Nicobar Island, India
Abstract Views :249 |
PDF Views:129
Authors
Affiliations
1 Botanical Survey of India, Andaman & Nicobar Regional Centre, Port Blair 744 102, IN
2 Botanical Survey of India, Western Regional Centre, Pune 411 001, IN
1 Botanical Survey of India, Andaman & Nicobar Regional Centre, Port Blair 744 102, IN
2 Botanical Survey of India, Western Regional Centre, Pune 411 001, IN
Source
Nelumbo - The Bulletin of the Botanical Survey of India, Vol 51 (2009), Pagination: 1-4Abstract
A new species viz. Medinilla balakrishnanii, allied to M. coriacea Merr., is described. Medinilla speciosa (Reinw. ex Blume) Blume is reported for the first time as an addition to the Flora of India. Detailed descriptions, ecological notes with illustration are provided.Keywords
New Species, New Record, Great Nicobar Island, India.Full Text
- Contribution to the Flora of Limestone Caves in Baratang Island, Andamans
Abstract Views :243 |
PDF Views:123
Authors
Affiliations
1 Botanical Survey of India, Western Circle, Pune 411 001, IN
2 Botanical Survey of India, Andaman & Nicobar Circle, Port Blair 744 102, IN
1 Botanical Survey of India, Western Circle, Pune 411 001, IN
2 Botanical Survey of India, Andaman & Nicobar Circle, Port Blair 744 102, IN
Source
Nelumbo - The Bulletin of the Botanical Survey of India, Vol 50, No 1-4 (2008), Pagination: 19-22Abstract
Baratang Island is one of the geologically interesting area in Andamans with many mud volcanoes and limestone caves. A first hand report of the plants occurring in and around the limestone caves is presented. A total of 152 taxa are listed.Full Text
- Recollection of Cassine viburnifolia (Juss.) Ding Hou (Celastraceae) from Andaman Islands
Abstract Views :189 |
PDF Views:106
Authors
Affiliations
1 Botanical Survey of India, Andaman & Nicobar Circle, Port Blair 744 102, IN
2 Botanical Survey of India, Western Circle, Pune - 411 001, IN
1 Botanical Survey of India, Andaman & Nicobar Circle, Port Blair 744 102, IN
2 Botanical Survey of India, Western Circle, Pune - 411 001, IN
Source
Nelumbo - The Bulletin of the Botanical Survey of India, Vol 50, No 1-4 (2008), Pagination: 161-162Abstract
No Abstract.Full Text
- Kedarnath Flash Floods: a Hydrological and Hydraulic Simulation Study
Abstract Views :196 |
PDF Views:94
Authors
Affiliations
1 National Remote Sensing Centre, Indian Space Research Organisation, Balanagar, Hyderabad 500 037, IN
1 National Remote Sensing Centre, Indian Space Research Organisation, Balanagar, Hyderabad 500 037, IN
Source
Current Science, Vol 106, No 4 (2014), Pagination: 598-603Abstract
The recent floods in the Kedarnath area, Uttarakhand are a classic example of flash floods in the Mandakini River that devastated the country by killing thousands of people besides livestock. Though the duration of the event was small compared to other flood disasters in the country, it resulted in severe damage to property and life. Post-disaster satellite images depict that the river banks were eroded completely along the Kedarnath valley due to the flash floods and few new channels were visible. Extreme erosion took place in the upstream portion of Kedarnath, besides the breach of Chorabari Lake and deposition of debris/sediments in the valley. Hydrological and hydraulic simulation study was carried out in the Mandakini River using space-based inputs to quantify the causes of the flash floods and their impact. Chorabari Lake breach analysis was carried out using Froehlich theory. Flood inundation simulations were done using CARTO DEM of 10 m posting in which the combined effect of lake breach and high-intensity rainfall flood was examined. As the slopes are very steep in the upstream catchment area, lag-time of the peak flood was found to be less and washed-off the Kedarnath valley without any alert. The study reveals quantitative parameters of the disaster which was due to an integrated effect of high rainfall intensity, sudden breach of Chorabari Lake and very steep topography.Keywords
Flash Floods, Flood Inundation Simulation, Hydrological Modelling, Lake Breach.Full Text
- Flash Flood Disaster Threat to Indian Rail Bridges:A Spatial Simulation Study of Machak River Flood, Madhya Pradesh
Abstract Views :179 |
PDF Views:100
Authors
Affiliations
1 National Remote Sensing Centre, Indian Space Research Organisation, 500 037, IN
1 National Remote Sensing Centre, Indian Space Research Organisation, 500 037, IN
Source
Current Science, Vol 112, No 05 (2017), Pagination: 1028-1033Abstract
The recent flood in Machak River, Madhya Pradesh, India is a distinctive paradigm of flash floods that washed off rail tracks and killed a number of passengers besides incredible damage to Indian Railways and to the surrounding villages. This shows the vulnerability of bridges/culverts to flash floods in the country. Flash floods devastated the Machak River during the midnight of 4 August 2015 due to heavy rainfall in the catchment. The duration of flooding was small with less lead-time. Narrow river sections could not accommodate the peak discharge causing severe flooding in floodplains. Hydrological and hydro dynamic simulation was studied in the Machak River using space-based inputs to quantify the causes of flash floods and its impact. Satellite-based rainfall (GPM and IMD's WRF merged product) was used in hydrological modelling in the absence of field rainfall and discharge data. Flood inundation simulations were done using CARTO digital elevation model of 10 m resolution. Inundation extent, depth of inundation, and velocity of flow at different reaches were examined. As the slopes were steep in the upstream catchment area, the lag-time of the peak flood was found to be less and washed off the Machak rail culvert without any alert. The study reveals that quantitative parameters of the disaster are due to high intensity of rainfall, drainage congestion and sudden change of slopes across the catchment.Keywords
Hydrological Simulation, Hydrodynamic Modeling, Machak River, Rail Accident.Full Text
- Nationwide Assessment of Forest Burnt Area in India Using Resourcesat-2 AWiFS Data
Abstract Views :240 |
PDF Views:92
Authors
C. Sudhakar Reddy
1,
C. S. Jha
1,
G. Manaswini
1,
V. V. L. Padma Alekhya
1,
S. Vazeed Pasha
1,
K. V. Satish
1,
P. G. Diwakar
1,
V. K. Dadhwal
1
Affiliations
1 National Remote Sensing Centre, Indian Space Research Organisation, Balanagar, Hyderabad 500 037, IN
1 National Remote Sensing Centre, Indian Space Research Organisation, Balanagar, Hyderabad 500 037, IN
Source
Current Science, Vol 112, No 07 (2017), Pagination: 1521-1532Abstract
This study provides application of Resourcesat-2 AWiFS satellite imagery for forest burnt area assessment in India. AWiFS datasets covering peak forest fire months of 2014 have been analysed. The total burnt area under vegetation cover (forest, scrub and grasslands) of India was estimated as 57,127.75 sq. km. In 2014, 7% of forest cover of India was affected by fires. Of the major forest types, dry deciduous forests are affected by the highest burnt area, followed by moist deciduous forests. Among the biogeographic zones, the highest forest burnt area was recorded in Deccan followed by North East and Western Ghats. The highest burnt area was recorded in Odisha followed by Andhra Pradesh, Maharashtra, Chhattisgarh, Tamil Nadu, Madhya Pradesh, Telangana, Jharkhand, Manipur and Karnataka. Spatial analysis shows that 232 grid cells in India have a burnt area greater than 20 sq. km. The database generated would be useful in ecological damage assessment, fire risk modelling, carbon emissions accounting and biodiversity conservation.Keywords
AWiFS, Forest Fire, Forest Type, India, Remote Sensing.Full Text
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