Arquivo da tag: Enchentes

The Coming California Megastorm (New York Times)

Raymond Zhong

A different ‘Big One’ is approaching. Climate change is hastening its arrival.

Aug. 12, 2022

California, where earthquakes, droughts and wildfires have shaped life for generations, also faces the growing threat of another kind of calamity, one whose fury would be felt across the entire state.

This one will come from the sky.

According to new research, it will very likely take shape one winter in the Pacific, near Hawaii. No one knows exactly when, but from the vast expanse of tropical air around the Equator, atmospheric currents will pluck out a long tendril of water vapor and funnel it toward the West Coast.

This vapor plume will be enormous, hundreds of miles wide and more than 1,200 miles long, and seething with ferocious winds. It will be carrying so much water that if you converted it all to liquid, its flow would be about 26 times what the Mississippi River discharges into the Gulf of Mexico at any given moment.

When this torpedo of moisture reaches California, it will crash into the mountains and be forced upward. This will cool its payload of vapor and kick off weeks and waves of rain and snow.

The coming superstorm — really, a rapid procession of what scientists call atmospheric rivers — will be the ultimate test of the dams, levees and bypasses California has built to impound nature’s might.

But in a state where scarcity of water has long been the central fact of existence, global warming is not only worsening droughts and wildfires. Because warmer air can hold more moisture, atmospheric rivers can carry bigger cargoes of precipitation. The infrastructure design standards, hazard maps and disaster response plans that protected California from flooding in the past might soon be out of date.

As humans burn fossil fuels and heat up the planet, we have already increased the chances each year that California will experience a monthlong, statewide megastorm of this severity to roughly 1 in 50, according to a new study published Friday. (The hypothetical storm visualized here is based on computer modeling from this study.)

In the coming decades, if global average temperatures climb by another 1.8 degrees Fahrenheit, or 1 degree Celsius — and current trends suggest they might — then the likelihood of such storms will go up further, to nearly 1 in 30.

At the same time, the risk of megastorms that are rarer but even stronger, with much fiercer downpours, will rise as well.

These are alarming possibilities. But geological evidence suggests the West has been struck by cataclysmic floods several times over the past millennium, and the new study provides the most advanced look yet at how this threat is evolving in the age of human-caused global warming.

The researchers specifically considered hypothetical storms that are extreme but realistic, and which would probably strain California’s flood preparations. According to their findings, powerful storms that once would not have been expected to occur in an average human lifetime are fast becoming ones with significant risks of happening during the span of a home mortgage.

“We got kind of lucky to avoid it in the 20th century,” said Daniel L. Swain, a climate scientist at the University of California, Los Angeles, who prepared the new study with Xingying Huang of the National Center for Atmospheric Research in Boulder, Colo. “I would be very surprised to avoid it occurring in the 21st.”

Unlike a giant earthquake, the other “Big One” threatening California, an atmospheric river superstorm will not sneak up on the state. Forecasters can now spot incoming atmospheric rivers five days to a week in advance, though they don’t always know exactly where they’ll hit or how intense they’ll be.

Using Dr. Huang and Dr. Swain’s findings, California hopes to be ready even earlier. Aided by supercomputers, state officials plan to map out how all that precipitation will work its way through rivers and over land. They will hunt for gaps in evacuation plans and emergency services.

The last time government agencies studied a hypothetical California megaflood, more than a decade ago, they estimated it could cause $725 billion in property damage and economic disruption. That was three times the projected fallout from a severe San Andreas Fault earthquake, and five times the economic damage from Hurricane Katrina, which left much of New Orleans underwater for weeks in 2005.

Dr. Swain and Dr. Huang have handed California a new script for what could be one of its most challenging months in history. Now begin the dress rehearsals.

“Mother Nature has no obligation to wait for us,” said Michael Anderson, California’s state climatologist.

In fact, nature has not been wasting any time testing California’s defenses. And when it comes to risks to the water system, carbon dioxide in the atmosphere is hardly the state’s only foe.


On Feb. 12, 2017, almost 190,000 people living north of Sacramento received an urgent order: Get out. Now. Part of the tallest dam in America was verging on collapse.

That day, Ronald Stork was in another part of the state, where he was worrying about precisely this kind of disaster — at a different dam.

Standing with binoculars near California’s New Exchequer Dam, he dreaded what might happen if large amounts of water were ever sent through the dam’s spillways. Mr. Stork, a policy expert with the conservation group Friends of the River, had seen on a previous visit to Exchequer that the nearby earth was fractured and could be easily eroded. If enough water rushed through, it might cause major erosion and destabilize the spillways.

He only learned later that his fears were playing out in real time, 150 miles north. At the Oroville Dam, a 770-foot-tall facility built in the 1960s, water from atmospheric rivers was washing away the soil and rock beneath the dam’s emergency spillway, which is essentially a hillside next to the main chute that acts like an overflow drain in a bathtub. The top of the emergency spillway looked like it might buckle, which would send a wall of water cascading toward the cities below.

Mr. Stork had no idea this was happening until he got home to Sacramento and found his neighbor in a panic. The neighbor’s mother lived downriver from Oroville. She didn’t drive anymore. How was he going to get her out?

Mr. Stork had filed motions and written letters to officials, starting in 2001, about vulnerabilities at Oroville. People were now in danger because nobody had listened. “It was nearly soul crushing,” he said.

“With flood hazard, it’s never the fastball that hits you,” said Nicholas Pinter, an earth scientist at the University of California, Davis. “It’s the curveball that comes from a direction you don’t anticipate. And Oroville was one of those.”

Ronald Stork in his office at Friends of the River in Sacramento.

The spillway of the New Exchequer Dam.

Such perils had lurked at Oroville for so long because California’s Department of Water Resources had been “overconfident and complacent” about its infrastructure, tending to react to problems rather than pre-empt them, independent investigators later wrote in a report. It is not clear this culture is changing, even as the 21st-century climate threatens to test the state’s aging dams in new ways. One recent study estimated that climate change had boosted precipitation from the 2017 storms at Oroville by up to 15 percent.

A year and a half after the crisis, crews were busy rebuilding Oroville’s emergency spillway when the federal hydropower regulator wrote to the state with some unsettling news: The reconstructed emergency spillway will not be big enough to safely handle the “probable maximum flood,” or the largest amount of water that might ever fall there.

Sources: Global Historical Climatology Network, Huang and Swain (2022) Measurements taken from the Oroville weather station and the nearest modeled data point

This is the standard most major hydroelectric projects in the United States have to meet. The idea is that spillways should basically never fail because of excessive rain.

Today, scientists say they believe climate change might be increasing “probable maximum” precipitation levels at many dams. When the Oroville evacuation was ordered in 2017, nowhere near that much water had been flowing through the dam’s emergency spillway.

Yet California officials have downplayed these concerns about the capacity of Oroville’s emergency spillway, which were raised by the Federal Energy Regulatory Commission. Such extreme flows are a “remote” possibility, they argued in a letter last year. Therefore, further upgrades at Oroville aren’t urgently needed.

In a curt reply last month, the commission said this position was “not acceptable.” It gave the state until mid-September to submit a plan for addressing the issue.

The Department of Water Resources told The Times it would continue studying the matter. The Federal Energy Regulatory Commission declined to comment.

“People could die,” Mr. Stork said. “And it bothers the hell out of me.”


Donald G. Sullivan was lying in bed one night, early in his career as a scientist, when he realized his data might hold a startling secret.

For his master’s research at the University of California, Berkeley, he had sampled the sediment beneath a remote lake in the Sacramento Valley and was hoping to study the history of vegetation in the area. But a lot of the pollen in his sediment cores didn’t seem to be from nearby. How had it gotten there?

When he X-rayed the cores, he found layers where the sediment was denser. Maybe, he surmised, these layers were filled with sand and silt that had washed in during floods.

It was only late that night that he tried to estimate the ages of the layers. They lined up neatly with other records of West Coast megafloods.

“That’s when it clicked,” said Dr. Sullivan, who is now at the University of Denver.

His findings, from 1982, showed that major floods hadn’t been exceptionally rare occurrences over the past eight centuries. They took place every 100 to 200 years. And in the decades since, advancements in modeling have helped scientists evaluate how quickly the risks are rising because of climate change.

For their new study, which was published in the journal Science Advances, Dr. Huang and Dr. Swain replayed portions of the 20th and 21st centuries using 40 simulations of the global climate. Extreme weather events, by definition, don’t occur very often. So by using computer models to create realistic alternate histories of the past, present and future climate, scientists can study a longer record of events than the real world offers.

Dr. Swain and Dr. Huang looked at all the monthlong California storms that took place during two time segments in the simulations, one in the recent past and the other in a future with high global warming, and chose one of the most intense events from each period. They then used a weather model to produce detailed play-by-plays of where and when the storms dump their water.

Those details matter. There are “so many different factors” that make an atmospheric river deadly or benign, Dr. Huang said.

Xingying Huang of the National Center for Atmospheric Research in Boulder, Colo. Rachel Woolf for The New York Times

The New Don Pedro Dam spillway.

Wes Monier, a hydrologist, with a 1997 photo of water rushing through the New Don Pedro Reservoir spillway.

In the high Sierras, for example, atmospheric rivers today largely bring snow. But higher temperatures are shifting the balance toward rain. Some of this rain can fall on snowpack that accumulated earlier, melting it and sending even more water toward towns and cities below.

Climate change might be affecting atmospheric rivers in other ways, too, said F. Martin Ralph of the Scripps Institution of Oceanography at the University of California, San Diego. How strong their winds are, for instance. Or how long they last: Some storms stall, barraging an area for days on end, while others blow through quickly.

Scientists are also working to improve atmospheric river forecasts, which is no easy task as the West experiences increasingly sharp shifts from very dry conditions to very wet and back again. In October, strong storms broke records in Sacramento and other places. Yet this January through March was the driest in the Sierra Nevada in more than a century.

“My scientific gut says there’s change happening,” Dr. Ralph said. “And we just haven’t quite pinned down how to detect it adequately.”

Better forecasting is already helping California run some of its reservoirs more efficiently, a crucial step toward coping with wetter wet years and drier dry ones.

On the last day of 2016, Wes Monier was looking at forecasts on his iPad and getting a sinking feeling.

Mr. Monier is chief hydrologist for the Turlock Irrigation District, which operates the New Don Pedro Reservoir near Modesto. The Tuolumne River, where the Don Pedro sits, was coming out of its driest four years in a millennium. Now, some terrifying rainfall projections were rolling in.

First, 23.2 inches over the next 16 days. A day later: 28.8 inches. Then 37.1 inches, roughly what the area normally received in a full year.

If Mr. Monier started releasing Don Pedro’s water too quickly, homes and farms downstream would flood. Release too much and he would be accused of squandering water that would be precious come summer.

But the forecasts helped him time his flood releases precisely enough that, after weeks of rain, the water in the dam ended up just shy of capacity. Barely a drop was wasted, although some orchards were flooded, and growers took a financial hit.

The next storm might be even bigger, though. And even the best data and forecasts might not allow Mr. Monier to stop it from causing destruction. “There’s a point there where I can’t do anything,” he said.


How do you protect a place as vast as California from a storm as colossal as that? Two ways, said David Peterson, a veteran engineer. Change where the water goes, or change where the people are. Ideally, both. But neither is easy.

Firebaugh is a quiet, mostly Hispanic city of 8,100 people, one of many small communities that power the Central Valley’s prodigious agricultural economy. Many residents work at nearby facilities that process almonds, pistachios, garlic and tomatoes.

Firebaugh also sits right on the San Joaquin River.

For a sleepless stretch of early 2017, Ben Gallegos, Firebaugh’s city manager, did little but watch the river rise and debate whether to evacuate half the town. Water from winter storms had already turned the town’s cherished rodeo grounds into a swamp. Now it was threatening homes, schools, churches and the wastewater treatment plant. If that flooded, people would be unable to flush their toilets. Raw sewage would flow down the San Joaquin.

Luckily, the river stopped rising. Still, the experience led Mr. Gallegos to apply for tens of millions in funding for new and improved levees around Firebaugh.

Levees change where the water goes, giving rivers more room to swell before they inundate the land. Levee failures in New Orleans were what turned Katrina into an epochal catastrophe, and after that storm, California toughened levee standards in urbanized areas of the Sacramento and San Joaquin Valleys, two major river basins of the Central Valley.

The idea is to keep people out of places where the levees don’t protect against 200-year storms, or those with a 0.5 percent chance of occurring in any year. To account for rising seas and the shifting climate, California requires that levees be recertified as providing this level of defense at least every 20 years.

Firebaugh, Calif., on the San Joaquin River, is home to 8,100 people and helps power the Central Valley’s agricultural economy.

Ben Gallegos, the Firebaugh city manager.

A 6-year-old’s birthday celebration in Firebaugh.

The problem is that once levees are strengthened, the areas behind them often become particularly attractive for development: fancier homes, bigger buildings, more people. The likelihood of a disaster is reduced, but the consequences, should one strike, are increased.

Federal agencies try to stop this by not funding infrastructure projects that induce growth in flood zones. But “it’s almost impossible to generate the local funds to raise that levee if you don’t facilitate some sort of growth behind the levee,” Mr. Peterson said. “You need that economic activity to pay for the project,” he said. “It puts you in a Catch-22.”

A project to provide 200-year protection to the Mossdale Tract, a large area south of Stockton, one of the San Joaquin Valley’s major cities, has been on pause for years because the Army Corps of Engineers fears it would spur growth, said Chris Elias, executive director of the San Joaquin Area Flood Control Agency, which is leading the project. City planners have agreed to freeze development across thousands of acres, but the Corps still hasn’t given its final blessing.

The Corps and state and local agencies will begin studying how best to protect the area this fall, said Tyler M. Stalker, a spokesman for the Corps’s Sacramento District.

The plodding pace of work in the San Joaquin Valley has set people on edge. At a recent public hearing in Stockton on flood risk, Mr. Elias stood up and highlighted some troubling math.

The Department of Water Resources says up to $30 billion in investment is needed over the next 30 years to keep the Central Valley safe. Yet over the past 15 years, the state managed to spend only $3.5 billion.

“We have to find ways to get ahead of the curve,” Mr. Elias said. “We don’t want to have a Katrina 2.0 play out right here in the heart of Stockton.”

As Mr. Elias waits for projects to be approved and budgets to come through, heat and moisture will continue to churn over the Pacific. Government agencies, battling the forces of inertia, indifference and delay, will make plans and update policies. And Stockton and the Central Valley, which runs through the heart of California, will count down the days and years until the inevitable storm.

T​​he Sacramento-San Joaquin Delta near Stockton, Calif.


The megastorm simulation is based on the “ARkHist” storm modeled by Huang and Swain, Science Advances (2022), a hypothetical statewide, 30-day atmospheric river storm sequence over California with an approximately 2 percent likelihood of occurring each year in the present climate. Data was generated using the Weather Research and Forecasting model and global climate simulations from the Community Earth System Model Large Ensemble.

The chart of precipitation at Oroville compares cumulative rainfall at the Oroville weather station before the 2017 crisis with cumulative rainfall at the closest data point in ARkHist.

The rainfall visualization compares observed hourly rainfall in December 2016 from the Los Angeles Downtown weather station with rainfall at the closest data point in a hypothetical future megastorm, the ARkFuture scenario in Huang and Swain (2022). This storm would be a rare but plausible event in the second half of the 21st century if nations continue on a path of high greenhouse-gas emissions.

Additional credits

The 3D rainfall visualization and augmented reality effect by Nia Adurogbola, Jeffrey Gray, Evan Grothjan, Lydia Jessup, Max Lauter, Daniel Mangosing, Noah Pisner, James Surdam and Raymond Zhong.

Photo editing by Matt McCann.

Produced by Sarah Graham, Claire O’Neill, Jesse Pesta and Nadja Popovich.

Audio produced by Kate Winslett.

Clima marombado (Folha de S.Paulo)

Marcelo Leite, 31/05/2015  01h45

Como o jornal anda cheio de notícias boas, esta coluna retoma sua predileção desmesurada pelas más novas impopulares e anuncia: 2015 caminha para ser dos infernos também na esfera do clima.

É provável, por exemplo, que este ano bata o recorde de temperatura global. A marca estava antes, veja só, com 2014. Os dez anos mais escaldantes ocorreram todos depois de 1998.

Um dos que acreditam no novo recorde é o alemão Stefan Rahmstorf. O climatologista do Instituto Potsdam de Pesquisa sobre Impacto do Clima, que ficou famoso em 2007 por criticar as previsões do IPCC como muito conservadoras, lançou sua predição para 20 jornalistas de 17 países reunidos em Berlim há 20 dias.

O período janeiro-abril de 2015 brindou o planeta com o primeiro quadrimestre mais quente já registrado desde 1880. O período de 12 meses compreendido entre maio de 2014 e abril de 2015 também foi o pior em matéria de calor.

Isso tudo já acontecia enquanto o fenômeno El Niño ainda era considerado fraco. Esse aquecimento anormal das águas do Pacífico na costa oeste sul-americana, que costuma abrasar o clima mundial, ganhou impulso neste mês de maio e deve permanecer até o segundo semestre.

Notícia péssima para o Nordeste brasileiro. O semiárido tem bolsões que enfrentam o quarto ano seguido de seca. Entre os efeitos mais conhecidos de um El Niño está exatamente a diminuição das chuvas nessa região do Brasil (assim como o aumento da precipitação no Sul).

Pior é a situação na Índia. Até sexta-feira (29), uma onda de calor –a pior em duas décadas, com temperaturas de 47 graus Celsius– havia causado mais de 2.000 mortes. E o El Niño pode atrasar e enfraquecer as monções, chuvas torrenciais que começam em junho e poderiam refrescar o segundo país mais populoso do mundo.

Enquanto indianos torram, amazonenses estão debaixo d’água. A cheia do rio Negro, também ela perto de bater recordes, já atrapalhou a vida de 238 mil pessoas em 33 municípios do Estado do Amazonas.

O governo estadual se limita a medidas de remediação. Mais de 450 toneladas de alimentos não perecíveis foram distribuídas, assim como “kits dormitório” (colchões, redes e mosquiteiros) e “kits de higiene pessoal” para milhares de desabrigados.

Também foram destinados às cidades atingidas 68 metros cúbicos de madeira e 750 kits de tábuas, caibros e ripões para os moradores construírem passarelas elevadas conhecidas como “marombas”.

Essa enchente provavelmente nada tem a ver com o El Niño, e também seria difícil demonstrar um nexo causal entre a onda de calor indiana e a anomalia no Pacífico. Os dois eventos constituem bons exemplos, contudo, das situações extremas que a mudança do clima em curso deverá tornar mais frequentes nas próximas décadas.

Pelo andar da carruagem das negociações internacionais, parece cada vez mais difícil, se não impossível, que se consiga evitar um aquecimento global maior que 2 graus Celsius neste século. Esse é o limite de segurança indicado pelo IPCC.

A mudança do clima está contratada. Não resta muito mais que adaptar-se –e preparar a infraestrutura das cidades para ela exigirá muito mais do que marombas improvisadas.

Exclusivo: bolivianos culpam Brasil por enchentes e desejam processar o país por danos e prejuízos de bilhões de dólares (+RO)


Walter Justiniano: esta tragédia é como a Crônica de Uma Morte Anunciada, de Gabriel Garcia Marquez

Mais um imbróglio vem aí pela frente envolvendo as usinas do rio Madeira, o progresso e a discórdia. O consultor ambiental boliviano, Walter Justiniano Martinez, 54, de Guayaramerin (Bolívia), tem em mãos um relatório onde consta que o Brasil é o culpado pelas enchentes na Bolívia, que culminou com 60 pessoas mortas e 90 mil cabeças de gados perdidas. O prejuízo é de cerca de 50 milhões de dólares e mais de 40 mil hectares de culturas agrícolas afetadas. Segundo ele, “o governo boliviano sabia dos problemas que seriam provocados pelas barragens das usinas de Jirau e Santo Antônio e não fez nada a este respeito”. Explicando, as represas de Jirau e Santo Antônio não deixam a água escoar, culminando com enchentes rio acima, pegando o Beni. As fortes chuvas que caem sobre a Bolívia agravaram ainda mais o problema. Veja no mapa abaixo.

As represes de Jirau e S. Antônio alagaram o Beni

Bolívia conhecia os efeitos de barragens brasileiras na Amazônia.  O governo sabia que as barragens construídas na bacia do rio Madeira causariam grandes inundações no país por mais de seis anos.

Em 2006, o ministro dos Negócios estrangeiros David Choquehuanca, enviou uma carta para seu homólogo brasileiro manifestando o o perigo da construção destas barragens para a Bolívia. O governo boliviano  já tinha alertado sobre os impactos há mais de sete anos.

Cerca de 90 mil cabeças de gado perdidas

Na nota enviada por Choquehuanca, citado em La Razón (jornal boliviano), argumentou-se que entre os impactos prováveis “é considerado a inundação do território boliviano, como um efeito dos reservatórios que afetarão, de um lado, a existência da Floresta Amazônica, na bacia do Madeira, as riquezas em castanha”.

O processo de consulta bi-nacional com vários encontros e reuniões presidenciais, ministeriais e técnicas foi lançado em novembro do mesmo ano. O II encontro técnico realizado nos dias 30 e 31 de outubro de 2008, em La Paz, a troca de informações sobre os projetos hidrelétricos Jirau e Santo Antonio. Bolívia, então, expressa seu aborrecimento pela ausência de delegados técnicos suficientes, do Brasil, apesar do compromisso.
No mesmo tempo, organizações camponesas da Bolívia e do Brasil criaram o movimento em defesa da bacia do Rio Madeira e a Região Amazônica.
Estudos e declarações de organizações de proteção ambiental também alertaram para os riscos, incluindo a Liga de Defesa do Ambiente (Lidema), que, em 2009, exortou o governo “em conformidade com os acordos internacionais, independentemente da agenda positiva com o governo brasileiro”.
Em 2011, um seminário sobre projetos de energia no Brasil, o Vice Ministro Juan Carlos Alurralde, disse à Reuters que o governo não estava satisfeito com os relatórios do Brasil em defesa da hidrelétrica e esperava mais esclarecimentos e garantias.

Um prejuízo de 50 bilhões de dólares

Então, o primeiro secretário da Embaixada do Brasil na Bolívia, Ruy Ciarlini, disse à Reuters que eles tinham “dados científicos que mostram que não há nenhum risco”. Até ontem, em Beni foram relatadas 84 mil carcaças (gado) e perdas de 50 milhões de dólares. Mais de 39 mil hectares de culturas afetadas, enquanto o número de vítimas cresce dia a dia devido às enchentes.

O presidente Evo Morales, solicitou na terça-feira,  investigações sobre o impacto das enchentes  no Beni.

Fonte: +RO