Effects of drought on wildfires in forest landscapes of the Western Ghats, India

2019 ◽  
Vol 28 (6) ◽  
pp. 431 ◽  
Author(s):  
Narendran Kodandapani ◽  
Sean A. Parks
Keyword(s):  
Western Ghats ◽  
Wildland Fire ◽  
Spatial Scales ◽  
Regional Scale ◽  
Climate Variation ◽  
Mountain Range ◽  
Area Burned ◽  
Fire Activity ◽  
In Fire ◽  
The Western Ghats

Wildland fire is an understudied yet highly important disturbance agent on the Indian subcontinent. In particular, there is uncertainty regarding the degree to which annual climate variation influences inter-annual variability in fire activity. In this study, we evaluate wildland fire at two complementary spatial scales in the southern portion of the Western Ghats mountain range (hereafter ‘Western Ghats’) in India. At the larger regional scale, we evaluate temporal and spatial variability in fire activity from 2001 to 2015. At the smaller scale, we evaluate the relationship between annual area burned and climate variation within two landscapes nested within the Western Ghats (from c. 1996 to 2015). At the regional scale, we found that most fire activity was restricted to January–March, although substantial inter-annual variation was evident. For example, in 2004, 2009 and 2012, fire activity was approximately five times greater compared with the 3 years with the lowest fire activity. The landscape-scale analysis also revealed weak to strong correlations between annual area burned and climate variation in both landscapes. Although not the only factor influencing area burned, episodes of drought could be exerting an increasingly significant effect on wildfire activity in the Western Ghats.

Implications of changing climate for global wildland fire

2009 ◽  
Vol 18 (5) ◽  
pp. 483 ◽  
Author(s):  
Mike D. Flannigan ◽  
Meg A. Krawchuk ◽  
William J. de Groot ◽  
B. Mike Wotton ◽  
Lynn M. Gowman
Keyword(s):  
Wildland Fire ◽  
Fire Severity ◽  
Global Studies ◽  
Future Trends ◽  
Fire Occurrence ◽  
General Increase ◽  
Area Burned ◽  
Fire Activity ◽  
Linear Interactions

Wildland fire is a global phenomenon, and a result of interactions between climate–weather, fuels and people. Our climate is changing rapidly primarily through the release of greenhouse gases that may have profound and possibly unexpected impacts on global fire activity. The present paper reviews the current understanding of what the future may bring with respect to wildland fire and discusses future options for research and management. To date, research suggests a general increase in area burned and fire occurrence but there is a lot of spatial variability, with some areas of no change or even decreases in area burned and occurrence. Fire seasons are lengthening for temperate and boreal regions and this trend should continue in a warmer world. Future trends of fire severity and intensity are difficult to determine owing to the complex and non-linear interactions between weather, vegetation and people. Improved fire data are required along with continued global studies that dynamically include weather, vegetation, people, and other disturbances. Lastly, we need more research on the role of policy, practices and human behaviour because most of the global fire activity is directly attributable to people.

Spatially explicit forecasts of large wildland fire probability and suppression costs for California

2011 ◽  
Vol 20 (4) ◽  
pp. 508 ◽  
Author(s):  
Haiganoush K. Preisler ◽  
Anthony L. Westerling ◽  
Krista M. Gebert ◽  
Francisco Munoz-Arriola ◽  
Thomas P. Holmes
Keyword(s):  
Statistical Models ◽  
Spatial Representation ◽  
Wildland Fire ◽  
Fire Risk ◽  
Spatially Explicit ◽  
Fire Activity ◽  
Federal Land ◽  
Large Fires ◽  
In Fire ◽  
Federal Land Management

In the last decade, increases in fire activity and suppression expenditures have caused budgetary problems for federal land management agencies. Spatial forecasts of upcoming fire activity and costs have the potential to help reduce expenditures, and increase the efficiency of suppression efforts, by enabling them to focus resources where they have the greatest effect. In this paper, we present statistical models for estimating 1–6 months ahead spatially explicit forecasts of expected numbers, locations and costs of large fires on a 0.125° grid with vegetation, topography and hydroclimate data used as predictors. As an example, forecasts for California Federal and State protection responsibility are produced for historic dates and compared with recorded fire occurrence and cost data. The results seem promising in that the spatially explicit forecasts of large fire probabilities seem to match the actual occurrence of large fires, with the exception of years with widespread lightning events, which remain elusive. Forecasts of suppression expenditures did seem to differentiate between low- and high-cost fire years. Maps of forecast levels of expenditures provide managers with a spatial representation of where costly fires are most likely to occur. Additionally, the statistical models provide scientists with a tool for evaluating the skill of spatially explicit fire risk products.

scholarly journals Monitoring and Mapping of Shallow Landslides in a Tropical Environment Using Persistent Scatterer Interferometry: A Case Study from the Western Ghats, India

Geomatics ◽  
2020 ◽  
Vol 1 (1) ◽  
pp. 3-17
Author(s):  
Ambujendran Rajaneesh ◽  
Natarajan Logesh ◽  
Chakrapani Lekha Vishnu ◽  
El Hachemi Bouali ◽  
Thomas Oommen ◽  
...  
Keyword(s):  
Western Ghats ◽  
Regional Scale ◽  
Mitigation Measures ◽  
False Alarms ◽  
Persistent Scatterer Interferometry ◽  
Tropical Regions ◽  
Persistent Scatterer ◽  
Western Ghats Of India ◽  
Deformation Velocity ◽  
The Western Ghats

Persistent Scatterer Interferometry (PSI) techniques are now well established and accepted for monitoring ground displacements. The presence of shallow-seated landslides, ubiquitous phenomena in the tropics, offers an opportunity to monitor and map these hazards using PSI at the regional scale. Thus, the Western Ghats of India, experiencing a tropical climate and in a topographically complex region of the world, provides an ideal study site to test the efficacy of landslide detection with PSI. The biggest challenge in using the PSI technique in tropical regions is the additional noise in data due to vegetation. In this study, we filtered these noises by utilizing the 95-percentile of the highest coherence data, which also reduced the redundancy of the PSI points. The study examined 12 landslides that occurred within one of the three temporal categories grouped as Group 1, Group 2, and Group 3, categorized in relation to PSI monitoring periods, which was also further classified into east- and west-facing landslides. The Synthetic Aperture Radar (SAR) data is in descending mode, and, therefore, the east-facing landslides are characterized by positive deformation velocity values, whereas the west-facing landslides have negative deformation values. Further, the landslide-prone areas, delineated using the conventional factor of safety (FS), were refined and mapped using PSI velocity values. The combination of PSI with the conventional FS approach helped to identify exclusive zones prone to landslides. The main aim of such an attempt is to identify critical areas in the unstable category in the map prepared using FS and prioritizing the mitigation measures, and to develop a road map for any developmental activities. The approach also helps to increase confidence in the susceptibility mapping and reduce false alarms.

scholarly journals Planning and Managing Hill Stations in the Northern Western Ghats

2014 ◽  
Vol 26-27 (1) ◽  
Author(s):  
Manasi Karandikar
Keyword(s):  
Western Ghats ◽  
Large Scale ◽  
Economic Value ◽  
Economic Benefits ◽  
Limiting Factors ◽  
Mountain Range ◽  
Irreversible Damage ◽  
Tropical Country ◽  
The Hill ◽  
The Western Ghats

In a tropical country like India, where the climate is predominantly hot and dry, Hill Stations haveserved as great retreats for summer vacations. The hill stations are mainly service centers, providingcomfortable stay and travel for tourists. Being tourism destinations, the thrust is always given onincreasing the number of tourists. In recent past, tourist traffic at hill stations has increased significantlyand support infrastructure is being developed for the tourists.The limiting factors that should have natural control over such development are overlooked. This hascaused irreversible damage to the local natural resources, ecology and support systems. Unless a limit onthe total number of visitors is enforced at every destination and followed meticulously, it would not bepossible to maintain aesthetics, atmosphere, sound infrastructure and ecology for these destinations.Importantly, desires and aspirations of local people with their skill set should be integrated in the overallplan.In Maharashtra, majority of existing and upcoming hill stations are in the Western Ghats. Consideringthe ecological fragility of Western Ghats and various life supporting services given by this mountain range,ideally it is not recommended to have any large scale developmental projects. For projects that have alreadybeen approved, interventions to reduce current degradation & restore the near original ecosystem in the areaare now urgently necessary. It is important and possible to cater to the needs of local communities andecosystems and create models with economic benefits in a different way than promoting large scale areadevelopment projects. All future progress should be purely in the interest of maintaining ecologicalintegrity and not short-term economic value. This will need more detailed studies and change in policies.This article uses case studies of two such hill stations, which are also notified ESZ (Ecologically SensitiveZone) in Maharashtra to illustrate the above considerations. The article also evolves a ‘Planning andManagement Strategy’ that could be useful as foundation for upcoming destinations to integrate theecological perspective in the process of planning and development.

Regional Scale Erosion Assessment of a Sub-tropical Highland Segment in the Western Ghats of Kerala, South India

2011 ◽  
Vol 25 (14) ◽  
pp. 3715-3727 ◽  
Author(s):  
V. Prasannakumar ◽  
H. Vijith ◽  
N. Geetha ◽  
R. Shiny
Keyword(s):  
Western Ghats ◽  
South India ◽  
Regional Scale ◽  
The Western Ghats

scholarly journals A Scientific study of Forests of the Western Ghats

2021 ◽  
pp. 52-64
Author(s):  
Geethanjali T.M.
Keyword(s):  
Western Ghats ◽  
Tamil Nadu ◽  
Biological Diversity ◽  
Hot Spot ◽  
Scientific Study ◽  
World Heritage Site ◽  
Mountain Range ◽  
Indian States ◽  
Deccan Plateau ◽  
The Western Ghats

The Western Ghats in India’s Deccan Plateau has been recognized as one of the eight “hottest hot-spots” of biological diversity in the world. UNESCO has identified this region as a World Heritage Site. In Maharashtra, this mountain range is known as ‘Sahyadri’, ‘Dang forests’ in Gujarat, ‘Nilgiris’ in Tamil Nadu and Kerala, and ‘Malnad’ in Karnataka. It stretches across the six Indian states of Gujrat, Maharashtra, Goa, Tamil Nadu, Kerala, Karnataka and two union territories including Daman and Diu and Pondicherry. These hills begin near the border of Gujarat and Maharashtra, south of the Tapti river, and end at Kanyakumari, at the southern tip of India, covering an incredible 1,60,000 sq.km. In the 18th and 19th centuries, most of the people who classified the flora of these regions are hobbyists. Very few British Officers who conduct survey of this landscape release their books. A complete scientific study of this biodiversity hot-spot is yet to be undertaken. Until now, only a handful of scientists have undertaken a study of the Western Ghats. So, this present article expains a brief scientific study of the forests of the Western Ghats.

The sensitivity of fire activity to interannual climate variability in Victoria, Australia

2019 ◽  
Vol 69 (1) ◽  
pp. 146
Author(s):  
Sarah Harris ◽  
Neville Nicholls ◽  
Nigel Tapper ◽  
Graham Mills
Keyword(s):  
Climate Models ◽  
Fire Management ◽  
Fire Regime ◽  
Maximum Temperature ◽  
Area Burned ◽  
Climate Parameters ◽  
Fire Activity ◽  
Maximum Temperatures ◽  
In Fire ◽  
The Relationship

Climate change is expected to have an impact on fire activity in many regions around the globe.The extent of this can only be determined by first establishing the relationship between climate and fire activity. This study relates observed changes in fire activity in Victoria to observed changes in antecedent and concurrent climate parameters – maximum temperature, rainfall and vapour pressure, using data for 1972–2014. A first-difference approach was adopted to estimate the amount by which the observed changes in the climate parameters would have altered the fire activity in the absence of other confounding effects. This study provides a method for examining the sensitivity of fire activity to changes in climate parameters without the need to consider the complex response of fuel dynamics to future climates and changes in fire regime or fire management. We used stepwise multiple-regression to determine the months whose climate parameters explained much of the variance in the total number of fires (TNF) and area burned in a fire season. The best performing fire–climate models explained almost two-thirds of the variation in year-to-year variability of fire activity. The significant explanatory ability of the fire–climate models established in this study reveals the combination of climate parameters that closely relates to the observed year-to-year changes in fire activity, and this may provide an additional valuable resource for fire management planning. Further, we explored the role changes in climate have had on the trend in fire activity. Natural logarithm of area burned and mean fire size have not significantly increased over the study period, but the TNF has significantly increased. We find that the observed increase in maximum temperatures and decrease in rainfall account for 26% of the observed increase in TNF for the 1972–2014 period. Therefore, most of the upward trend found in fire numbers must be due to factors other than climate (i.e. changes in fire occurrence, reporting/recording, land and fire-management changes). Additionally, this study concludes that total area burned should have also increased significantly due to the observed changes in climate and that improved fire-management practicesmay be offsetting this expected increase in the area burned. Finally, using the relationship established in this study between fire numbers and climate parameters, we estimate that a 2°C increase in mean monthly maximum temperatures could be expected to lead to a 38% increase in fire numbers.

Zooming in on frozen-bed patches: scale-dependent controls on Fennoscandian ice sheet basal thermal zonation

1999 ◽  
Vol 28 ◽  
pp. 189-194 ◽  
Author(s):  
Johan Kleman ◽  
Clas Hättestrand ◽  
Anders Clarhäll
Keyword(s):  
Spatial Scales ◽  
Regional Scale ◽  
Ice Sheet ◽  
Small Strain ◽  
Mountain Range ◽  
Hilly Terrain ◽  
Order Reconstruction ◽  
Strain Heating ◽  
Glacial Landforms ◽  
The Last Glacial

AbstractIn this paper, we explore geomorphological evidence allowing a first- order reconstruction of the extent and pattern of frozen-bed conditions under the last Fennoscandian ice sheet. We mapped relict landscapes, i.e. glacial landforms and subaerially developed ground surfaces predating the last ice sheet and marking sustained frozen- bed conditions, at four different spatial scales. At the ice-sheet scale, relict landscapes are most abundant between the Last Glacial Maximum ice divide and the elevation axis of the Scandinavian mountain range. The location of frozen-bed zones was mainly a function of dispersal centre location (low surface temperatures and small strain heating) and small ice thickness over the eastern flank of the mountain range. At the mesoscale (260 × 360 km map area), the pattern of relict surfaces is governed by inward-cutting ice-stream erosion.Topographical control was weak, but relation to flow pattern was strong, with the major frozen-bed zone located where ice flow was strongly divergent. At the regional scale (40 × 65 km map area) in hilly terrain, topographical control was strong with relict surfaces only appearing above a plane dipping in the up-ice direction. At the local scale (12 × 14 km map area), control by topography was likewise strong, but the detailed boundary pattern was irregular, with specific landforms occurring both up- and down-ice of frozen patches.

scholarly journals Preceding Fall Drought Conditions and Overwinter Precipitation Effects on Spring Wildland Fire Activity in Canada

Fire ◽  
2020 ◽  
Vol 3 (2) ◽  
pp. 24
Author(s):  
Chelene Hanes ◽  
Mike Wotton ◽  
Douglas G. Woolford ◽  
David L. Martell ◽  
Mike Flannigan
Keyword(s):  
Boreal Forests ◽  
Wildland Fire ◽  
Fire Suppression ◽  
Fire Season ◽  
Fire Weather Index ◽  
Area Burned ◽  
Fire Activity ◽  
Drought Conditions ◽  
Carry Over ◽  
The Impact

Spring fire activity has increased in parts of Canada, particularly in the west, prompting fire managers to seek indicators of potential activity before the fire season starts. The overwintering adjustment of the Canadian Fire Weather Index System’s Drought Code (DC) is a method to adjust and carry-over the previous season’s drought conditions into the spring and potentially point to what lies ahead. The occurrence of spring fires is most strongly influenced by moisture in fine fuels. We used a zero-inflated Poisson regression model to examine the impact of the previous end of season Drought Code (DCf) and overwinter precipitation (Pow) while accounting for the day-to-day variation in fine fuel moisture that drives ignition potential. Impacts of DCf and Pow on area burned and fire suppression effectiveness were also explored using linear and logistic regression frameworks. Eight fire management regions across the boreal forests were analyzed using data from 1979 to 2018. For the majority of regions, drier fall conditions resulted in more human-caused spring fires, but not in greater area burned or reduced suppression effectiveness. The influence of Pow was much more variable pointing to the conclusion that Pow alone is not a good indicator of spring drought conditions.

Pathways for climate change effects on fire: Models, data, and uncertainties

2011 ◽  
Vol 35 (3) ◽  
pp. 393-407 ◽  
Author(s):  
Amy E. Hessl
Keyword(s):  
Climate Change ◽  
Fire History ◽  
Wildland Fire ◽  
Fire Severity ◽  
Empirical Studies ◽  
Large Body ◽  
Fire Regimes ◽  
Area Burned ◽  
Frequency Changes ◽  
In Fire

Fire is a global process affecting both the biosphere and the atmosphere. As a result, measuring rates of change in wildland fire and understanding the mechanisms responsible for such changes are important research goals. A large body of modeling studies projects increases in wildfire activity in future decades, but few empirical studies have documented change in modern fire regimes. Identifying generalizable pathways through which climate change may alter fire regimes is a critical next step for understanding, measuring, and modeling fire under a changing climate. In this progress report, I review recent model-, empirical-, and fire history-based studies of fire and climate change and propose three pathways along which fire regimes might respond to climate change: changes in fuel condition, fuel volume, and ignitions. Model- and empirical-based studies have largely focused on changes in fuel condition with some models projecting up to 50% increases in area burned under a 2 x CO2 climate. Fire history data derived from tree-rings, sediment charcoal, and soil charcoal have helped identify past trajectories of change in fire regimes and can point to possible future conditions. However, most fire history research has focused on changes in area burned and fire frequency. Changes in fire severity may be equally important for the earth system and require further attention. Critical research needs include next generation dynamic vegetation models (DGVMs) that consider changes in vegetation alongside changes in human activities and long fire history records from a variety of vegetation types suitable for validating these DGVMs.

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