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2020 CASE STUDY 2
The 2019 floods in the central u.s..
Lessons for Improving Health, Health Equity, and Resiliency
In spring 2019, the Midwest region endured historic flooding that caused widespread damage to millions of acres of farmland, killing livestock, inundating cities, and destroying infrastructure. CS_52
The Missouri River and North Central Flood resulted in over $10.9 billion of economic loss in the region, making it the costliest inland flood event in U.S. history. CS_52 Yet, this is just the beginning, as climate change continues to accelerate extreme precipitation, increasing the likelihood of severe events previously thought of as “once in 100 year floods.” CS_53 , CS_54
This 2019 disaster exhibited the same health harms and healthcare system disruptions seen in previous flooding events, and vulnerable populations – notably tribal and Indigenous communities – were once again disproportionately impacted. Thus, there is an enormous need for policy interventions to minimize health harms, improve health equity, and ensure community resilience as the frequency of these weather events increases.
Before-and-after images of catastrophic flooding in Nebraska. Left image taken March 20, 2018. Right image taken March 16, 2019.
Source: NASA Goddard Space Flight Center, with permission
The role of climate change, widespread devastation, and compounding inequities
The Missouri River and North Central Flood were the result of a powerful storm that occurred near the end of the wettest 12-month period on record in the U.S. (May 2018 – May 2019). CS_55 , CS_56 The storm struck numerous states, specifically Nebraska (see Figure 1), Iowa, Missouri, South Dakota, North Dakota, Minnesota, Wisconsin, and Michigan. Two additional severe flooding events occurred in 2019 in states further south, involving the Mississippi and Arkansas Rivers.
This flood event exhibits two key phenomena that have been observed over the last 50 years as a result of climate change: annual rainfall rates and extreme precipitation have increased across the country. CS_57 The greatest increases have been seen in the Midwest and Northeast, and these trends are expected to continue over the next century. Future climate projections also indicate that winter precipitation will increase over this region, CS_57 further increasing the likelihood of more frequent and more severe floods. For example, by mid-century the intensity of extreme precipitation events could increase by 40% across southern Wisconsin. CS_58 While it is too early to have detection and attribution studies for these floods, climate change has been linked to previous extreme precipitation and flood events. CS_59 , CS_60
Hundreds of people were displaced from their homes and millions of acres of agricultural land were inundated with floodwaters, killing thousands of livestock and preventing crop planting. CS_52 , CS_61 , CS_62 Federal Emergency Management Agency (FEMA) disaster declarations were made throughout the region, allowing individuals to apply for financial and housing assistance, though remaining at the same housing site continues to place them at risk of future flood events.
In Nebraska alone, 104 cities, 81 counties and 5 tribal nations received state or federal disaster declarations. FEMA approved over 3,000 individual assistance applications in Nebraska, with more than $27 million approved in FEMA Individual and Household Program dollars. In addition to personal property, infrastructure was heavily affected, with multiple bridges, dams, levees, and roads sustaining major damage (see Figure 2). CS_52
Destruction of Spencer Dam during Missouri River and North Central Floods. CS_63
- Oglala Sioux Tribe, Cheyenne River Sioux Tribe of the Cheyenne River Reservation, Standing Rock Sioux Tribe (North Dakota and South Dakota), Yankton Sioux Tribe of South Dakota, Lower Brule Sioux Tribe of the Lower Brule Reservation, Crow Creek Sioux Tribe of Crow Creek Reservation, Sisseton-Wahpeton Oyate of the Lake Traverse Reservation, Rosebud Sioux Tribe of the Rosebud Sioux Indian Reservation, Santee Sioux Nation, Omaha Tribe of Nebraska, Winnebago Tribe of Nebraska, Ponca Tribe of Nebraska, Sac & Fox Nation of Missouri (Kansas and Nebraska), Iowa Tribe of Kansas and Nebraska, and Sac & Fox Tribe of the Mississippi in Iowa.
Source: Nebraska Department of Natural Resources, with permission.
As with other climate-related disasters, the 2019 floods had devastating effects on already vulnerable communities as numerous tribes and Indigenous peoples were impacted,° adding to centuries of historical trauma. CS_64 , CS_65 Accounts of flooding on the Pine Ridge Reservation in South Dakota demonstrate the challenges that resource-limited communities face in coping with extreme weather events. CS_64 Delayed response by outside emergency services left tribal volunteers struggling to help residents stranded across large distances without access to supplies, drinking water, or medical care.66 Lack of equipment and limited transportation hampered evacuations. CS_67
Health harms and healthcare disruptions
There were three recorded deaths from drowning, but hidden health impacts were widespread and extended well beyond the immediate risks and injuries from floodwaters. In the aftermath, individuals in flooded areas were exposed to hazards like chemicals, electrical shocks, and debris. CS_68 Water, an essential foundation for health, was contaminated as towns’ wells and other drinking water sources were compromised. This put people, especially children, at increased risk for health harms like gastrointestinal illnesses. CS_69 Stranded residents relied on shipments of water from emergency services and volunteer organizations and the kindness of strangers ( see Box 1 ).
BOX 1: “We just remember the trust and commitment to each other”
Linda Emanuel, a registered nurse and farmer living in the hard-hit rural area of North Bend in Nebraska, helped organize flood recovery efforts. She recalled wondering, “How are we going to handle this? How do we inform the people of all the hazards without scaring them?” In addition to her educational role, she administered a limited supply of tetanus shots, obtained and distributed hard-to-find water testing kits, and coordinated PPE usage. In the first days of the flooding, she hosted some 25 stranded individuals in her home. Reminiscing about how community members came together amidst the devastation, Emanuel remarked, “We just remember the trust and the commitment to each other and to our town. We are definitely a resilient city.” CS_70
Standing water remained in many small town for months, and a four-year old child at the Yankton Sioux reservation in South Dakota likely contracted Methicillin-resistant Staphylococcus aureus (MRSA) after playing in a pond. CS_71 The mold and allergens that developed in the aftermath of the floods exacerbated respiratory illness. CS_72 Flooding also backed up sewer systems into basements; clean up required personal protective equipment (PPE) to prevent the potential spread of infectious diseases. The significant financial burdens, notably the loss of property in the absence of adequate insurance, can contribute to serious mental and emotional distress in flood victims. CS_73 , CS_74
Infrastructure disruptions, like flooded roads, meant that many individuals in rural areas were unable to access essential services including healthcare. In an interview with the New York Times, Ella Red Cloud-Yellow Horse, 59, from Pine Ridge Indian Reservation, recounts her own struggle to get to the hospital for a chemotherapy appointment. CS_64 After being stranded by flooding for days, she had contracted pneumonia, but she couldn’t be reached by an ambulance or tractor because her driveway was blocked by huge amounts of mud. She was forced to trudge through muddy flood waters for over an hour to get to the highway.
She told the Times, “I couldn’t breathe, but I knew I needed to get to the hospital.” Her story is an increasingly common occurrence as critical infrastructure is damaged by climate change-intensified extreme events. These infrastructure challenges are also often superimposed on top of the challenges of poverty and disproportionate rates of chronic diseases ( see the Case Study ). Multiple hospitals sustained damage and several long-term care facilities were forced to evacuate, with some closing permanently, as a result of the rising floodwaters, CS_75 likely exacerbating existing diseases.
A path towards a healthier, equitable, and more resilient future
As human-caused climate change increases the likelihood of precipitation events that can cause severe flooding disasters, public health systems must serve as a first line of defense against the resulting health harms. As such, the broader public health system needs to develop the capacity and capability to understand and address the health hazards associated with climate-related disasters. Often funds and resources for these efforts are focused on coastal communities; however, inland states face many climate-related hazards that are regularly overlooked. Building on or expanding programs similar to CDC’s Climate-Ready States and Cities Initiative will help communities in inland states prepare for future climate threats. CS_76
Additionally, public health officials, health systems, and climate scientists should collaborate to create robust early warning systems to help individuals and communities prepare for flood events. Education regarding the health impacts of flooding should not be limited to the communities affected, but it should also include policymakers and other stakeholders who can implement systemic changes to decrease and mitigate the effects of floods. Local knowledge offered by community members regarding water systems, weather patterns, and infrastructure will be essential for effective and context-specific adaptation. By implementing these changes and executing more inclusive flood emergency plans, communities will be better situated to face the flood events that are projected to increase in the years to come.
Introduction – Figure 1: Nebraska Flooding The Role of Climate Change – Figure 2: Destruction of Spencer Dam Health Harms and Healthcare Disruptions – Box 1: Remember the Trust A Path Towards Equality
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UK Floods Case Study November 2019
The UK experienced an extreme weather event in November 2019 when exceptionally heavy rainfall caused flooding in parts of the UK. Heavy downpours across large parts of northern England led to surface water and river flooding in parts of Yorkshire, Nottinghamshire, Greater Manchester, Derbyshire and Lincolnshire.
According to the Met Office, on Thursday 7th November 2019 over half of the average rainfall for the whole of November fell in parts of the Midlands and Yorkshire.
If you have images and/or videos of flooding or an eye witness account that you would be happy to share on an interactive flood impact map we are developing please send them [email protected]
What caused flooding in the UK in November 2019?
A large area of prolonged rainfall fell on parts of the UK in November 2019. Some areas experienced the whole of Novembers average rainfall over a period of 24 hours. Sheffield experienced 84mm of rainfall. The rainfall was caused by an area low pressure stalling over the UK.
Further reading/watching:
BBC Weather Overview
What were the effects the extreme weather in November 2019?
About 500 homes have been flooded in Doncaster with more than 1,000 properties evacuated in areas hit by the floods.
South Yorkshire Fire and Rescue said it had declared a major incident on the evening of Friday 8th November and firefighters rescued more than 40 people from the Fishlake area, near Doncaster. Residents of Fishlake said it was the first time the village had flooded in 100 years.
Empty coffins were seen floating inside the workshop of a flooded funeral parlour in the village.
Some villagers had to spend the night at a nearby pub, where staff said they had seen people crying because of the devastation.
The village church is collecting food to distribute to residents and roast dinners were delivered on Sunday to those who had remained in their homes.
Reseidents have complained that the River Don has not been dredged recently.
According to the BBC, Adrian Gill, a flood manager at the Environment Agency, said did not currently dredge the River Don “because we don’t think that’s the right thing to do” but the situation could be reviewed in the future.
Water sports enthusiast and teacher Mark Ibbotson, from Doncaster, said he, along with his 13-year-old son Logan, had rescued more than 30 people – including two babies – from a number of streets using his inflatable boat in Bentley where homes have been hit by flooding.
One of the most severely hit areas has been Bentley in Doncaster, where flooding affected many homes 12 years ago.
One resident told BBC Radio Sheffield: “The worry is our insurance policies are expensive as it is because of the 2007 floods, so now we’re all worried whether we’re going to get reinsured.”
Extensive flooding affected Rotherham , where residents were told to stay at home and not leave unless asked to do so by emergency services. Some have been taken to safety by boats.
Dozens of people were forced to spend the night in the Meadowhall shopping centre .
In Derbyshire, the River Derwent at Chatsworth reached its highest recorded level and council workers put up sandbags around Matlock and Matlock Bath, where the river was “dangerously high” .
A number of properties in Derby city centre were flooded, however, a full evacuation was not ordered as the River Derwent didn’t burst its banks to the extent emergency services believed it would.
The A52 – the main road route into Derby – was closed westbound between the city and the M1 along with a handful of smaller roads in the county.
Residents from 12 homes in Mansfield, Nottinghamshire, were unable to return home after a mudslide on Thursday led to 35 properties being evacuated .
In Nottinghamshire, residents living in mobile homes close to the River Trent in Newark were urged to move to higher ground.
On Friday, the floods claimed the life of a woman who was swept into the River Derwent at Rowsley in Derbyshire. Her body was found about two miles away in Darley Dale. She was named earlier as Derbyshire’s former High Sherriff Annie Hall .
Trains were cancelled in Yorkshire and parts of the East Midlands as rail routes were flooded.
BBC reporter Richard Cadey said some roads around Fishlake had been closed and the village was “effectively cut off because of flooding”. He said people on the ground had told him 90% of the homes there had been flooded.
The River Don, which flows through Sheffield, Rotherham and Doncaster, hit its highest recorded level at just over 6.3m (21ft), higher than it was in 2007 when it also flooded.
Sources:
England flooding: River warnings and rail delays continue
Flooding in pictures/videos
Torrential downpours flood parts of northern England – BBC
Flooding in Yorkshire – In Pictures – The Guardian
England flooding: A tour of a flooded house in Fishlake
River Derwent Flooding – Drone Video
Helicopter captures footage of flooded South Yorkshire
What were the responses to the UK floods in November 2019?
More than 100 flood warnings were put in place across England. The Environment Agency (EA) urged people to take them seriously.
The Environment Agency took to social media to warn people about the potential impacts of flooding.
AMBER warning for flood risk today ⚠️- rain will rotate over north and north midlands bringing heavy rain on already sodden ground – take care – flood warning updates here https://t.co/K5GUW3z87V pic.twitter.com/mDDAC3uLXc — John Curtin (@johncurtinEA) November 7, 2019
The Environment Agency worked day and night to reduce the impact of flooding. The Environment Agency responded to the flood risk by working closely with police, fire and rescue, local authorities and partners to reduce the risk of flooding and keep communities safe. On the ground, Environment Agency field teams worked through the night to operate flood storage areas and pump away flood water.
A major incident was declared in South Yorkshire,
Some residents were “angry and frustrated” at Doncaster Council – claiming it had not provided sandbags early enough to prevent properties from flooding, the station reported.
Political leaders visited areas affected by floods. On the campaign trail Boris Johnson promised over £2 billion to improve flood defences.
South Yorkshire Police said it had extra officers out on patrol to “protect the evacuated areas and support those affected by the floods”.
Following a meeting of COBRA, the government’s emergency committee, Prime Minister Boris Johnson anounced the following measures :
- An extra 100 Army personnel deployed from Wednesday to support the recovery effort in South Yorkshire
- Funding for local councils where households and businesses have been affected – equivalent to £500 per eligible household
- Up to £2,500 for small and medium-sized businesses which have suffered severe impacts not covered by insurance
Six days after the heavy rain, army personnel provided support to flood-hit communities .
Environment Agency warnings
Environment Agency working day and night to reduce flood impact
How effective were the mitigation strategies introduced since the 2007 floods?
Flood defences put in place in South Yorkshire managed to significantly reduce the impact of Thursday’s floods, the Environment Agency (EA) has said.
River levels in parts of the county rose overnight to almost the same as they were in June 2007, when two people died in Millhouses and the Wicker.
Despite a major incident being declared on Thursday, the EA said the area was protected by new walls and flood gates.
The river levels around Meadowhall were high, but the EA said its defences, as well as the ones put in by Meadowhall, had lessened the damage.
Elsewhere in South Yorkshire, £3m was spent by the EA to repair and improve defences running along Ea Beck , in the villages of Toll Bar and Bentley near Doncaster.
However, people living in settlements downstream of Sheffield have complained about the impact of the recently constructed defences. In Bentley, a low-lying neighbourhood on the north side of the River Don, forlorn terraced streets are still knee-deep in water. “You don’t have to be a hydrologist to see what’s happened,” said one man interviewed by a Guardian journalist . “Sheffield built flood defences in 2015-16. They spent about £20m protecting the lower Don. So the water has nowhere to go than the next place, Rotherham and then Doncaster.” He went on to say that residents received a “red alert” on Thursday night that there was a risk of flooding. He phoned an emergency number and requested sandbags. He was told that the council was not going to distribute them because the River Don’s banks had not been breached.
When the sandbags eventually arrived the community worked together to distribute them.
South Yorkshire flooding: Defences ‘reduce impact’
Related articles:
How do you stop flooding?
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- Review Article
- Published: 10 August 2021
Causes, impacts and patterns of disastrous river floods
- Bruno Merz ORCID: orcid.org/0000-0002-5992-1440 1 , 2 ,
- Günter Blöschl 3 ,
- Sergiy Vorogushyn ORCID: orcid.org/0000-0003-4639-7982 1 ,
- Francesco Dottori ORCID: orcid.org/0000-0002-1388-3303 4 ,
- Jeroen C. J. H. Aerts ORCID: orcid.org/0000-0002-2162-5814 5 , 6 ,
- Paul Bates 7 ,
- Miriam Bertola ORCID: orcid.org/0000-0002-5283-0386 3 ,
- Matthias Kemter 1 , 2 , 8 ,
- Heidi Kreibich 1 ,
- Upmanu Lall ORCID: orcid.org/0000-0003-0529-8128 9 &
- Elena Macdonald ORCID: orcid.org/0000-0003-0198-6556 1
Nature Reviews Earth & Environment volume 2 , pages 592–609 ( 2021 ) Cite this article
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- Natural hazards
Disastrous floods have caused millions of fatalities in the twentieth century, tens of billions of dollars of direct economic loss each year and serious disruption to global trade. In this Review, we provide a synthesis of the atmospheric, land surface and socio-economic processes that produce river floods with disastrous consequences. Disastrous floods have often been caused by processes fundamentally different from those of non-disastrous floods, such as unusual but recurring atmospheric circulation patterns or failures of flood defences, which lead to high levels of damage because they are unexpected both by citizens and by flood managers. Past trends in economic flood impacts show widespread increases, mostly driven by economic and population growth. However, the number of fatalities and people affected has decreased since the mid-1990s because of risk reduction measures, such as improved risk awareness and structural flood defences. Disastrous flooding is projected to increase in many regions, particularly in Asia and Africa, owing to climate and socio-economic changes, although substantial uncertainties remain. Assessing the risk of disastrous river floods requires a deeper understanding of their distinct causes. Transdisciplinary research is needed to understand the potential for surprise in flood risk systems better and to operationalize risk management concepts that account for limited knowledge and unexpected developments.
The causative mechanisms of floods with disastrous consequences tend to be different from those of non-disastrous floods, and show anomalies in one or several flood- and loss-generating processes.
Past trends in flood hazard show both upward and downward changes. In some regions, anthropogenic warming is already strong enough to override other drivers of change.
Flood hazards and impacts are projected to increase for many regions around the globe. Future flooding hotspots are expected in Asia and Africa, owing to climate and socio-economic changes.
Reducing vulnerability is a particularly effective way of reducing flood impacts. Global decreases in flood-affected people and fatalities since the mid-1990s (despite a growing population) are signs of effective risk reduction.
Disastrous floods often come as a surprise. Effective risk reduction requires an understanding of the causative processes that make these events distinct and to address the sources of surprise, including cognitive biases.
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Data availability.
The authors declare that the data supporting the findings of this study are available within the article and its supplementary information files. Other data can be provided by the authors on request.
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Acknowledgements
This work was supported by the DFG projects ‘SPATE’ (FOR 2416) and ‘NatRiskChange’ (GRK 2043/1), the FWF ‘SPATE’ project (I 3174), the ERC Advanced Grant ‘FloodChange’ project (number 291152), the Horizon 2020 ETN ‘System Risk’ project (number 676027) and the Helmholtz Climate Initiative. P.B. was supported by a Royal Society Wolfson Research Merit award. J.C.J.H.A. was supported by an ERC Advanced Grant COASTMOVE (number 884442) and a NWO-VICI grant (number 453-13-006).
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(AAL). A widespread indicator for risk, it is the estimated average loss per year considering the full range of scenarios from frequent events (zero or small loss) to extreme events (large loss or worst-case scenario).
Fall of rain onto existing snow, leading to flood runoff composed of snowmelt and rainfall.
Long, narrow and transient corridors of strong horizontal water vapour, transporting on average more than double the flow of the Amazon river and delivering moisture as heavy precipitation.
The fraction of the event water input (precipitation or snowmelt within the catchment) that is not retained in the catchment and that directly contributes to discharge during the event.
Consequences occurring in the inundated region during a flooding event.
Consequences occurring far away from the flooded region and/or after a flooding event.
Consequences of a flooding event that are difficult or impossible to monetarize, such as loss of life or loss of memorabilia.
The ratio of the number of people who lose their lives in a flood to the number of people affected by the flooding event.
The highest streamflow peak in each year.
The dates of the year when floods occur.
The distance over which flooding occurs simultaneously.
Level at which a flood causes extensive inundation, significant evacuations, or property transfer to higher ground.
Level at which a flood does not cause damage but requires mitigation action in preparation for more substantial flooding.
According to the DFO, either the total number of people left homeless after the incident, or the number of people evacuated during the flood.
Coupled Model Intercomparison Project Phase 5; for coordinated climate change experiments for the Fifth Assessment Report AR5 of the Intergovernmental Panel on Climate Change and beyond.
An indicator expressing the exceedance probability or rarity of an event. For instance, a 100-year flood discharge has a probability of 1/100 of being exceeded in a given year.
Relation between flood discharge and the associated return period.
Optimizing risk reduction measures based on the best available knowledge.
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Merz, B., Blöschl, G., Vorogushyn, S. et al. Causes, impacts and patterns of disastrous river floods. Nat Rev Earth Environ 2 , 592–609 (2021). https://doi.org/10.1038/s43017-021-00195-3
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The 2016 flood of Bihar, India: an analysis of its causes
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- Published: 23 February 2021
- Volume 107 , pages 751–769, ( 2021 )
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- Abhijit Das 1 ,
- Pritam Kumar Santra 1 &
- Sunando Bandyopadhyay 1
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Flood is common in the sub-Himalayan plains of the Indian state of Bihar. During the massive flood of the Ganga between 18 and 31 August 2016, 15 (out of 38) districts and 3459 villages of the state were affected. The flood inundated 6006 km 2 of area, harmed 8.82 million people, and caused damages worth US$ 73.99 million. To investigate the factors behind the event, we utilised SRTM elevation data and Landsat-8 OLI images to extract drainage networks and reservoirs of the region. Inundated area was delineated using MNDWI on MODIS data of 25-Aug-2016. Different hydrometeorological parameters employed in the study include percentage departure of monthly rainfall, discharge data of selected dams and barrages, and gauge data from six stations along a 526 km stretch of the Ganga: Buxar, Gandhi Ghat (Patna), Hathidah, Munger, Kahalgaon, and Manikchak Ghat. It was found that the flood was mainly caused by rapid release of water from the Bansagar Dam on the Son from 18 to 20-Aug-2016, as a tropical storm traversed through its upper catchment. Contributions from the Ganga’s Himalayan tributaries and upstream of the flooded area were negligible. The flood peak (50.52 m), recorded at Gandhi Ghat on 21 August 2016, passed downstream, and reached Manikchak Ghat (25.78 m) on 27–28 August 2016. The upstream extension of flooding due to the highest recorded flood level of 26.66 m of the Ganga at Farakka can only reach up to 6 km above Kahalgaon. Therefore, impoundment of the Ganga by the Farakka Barrage cannot have any impact on inundation of the areas above that limit and did not cause the 2016 floods.
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source : India Meteorological Department; Department of Hydrology and Meteorology, Govt. of Nepal)
source : Water Resource Department, Govt. of Bihar; Irrigation and Waterways Department, Govt. of West Bengal)
( Data source : Water Resource Department, Govt. of Bihar)
source : Water Resource Department, Govt. of Madhya Pradesh)
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The agencies from which various data were sourced in this article are thankfully acknowledged. Thanks are also due to Nabendu Sekhar Kar and Sayantan Das for various suggestions.
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Das, A., Santra, P.K. & Bandyopadhyay, S. The 2016 flood of Bihar, India: an analysis of its causes. Nat Hazards 107 , 751–769 (2021). https://doi.org/10.1007/s11069-021-04604-0
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DOI : https://doi.org/10.1007/s11069-021-04604-0
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