Weather Extremes Leave Parts of U.S. Grid Buckling

From highways in Texas to nuclear power plants in Illinois, the concrete, steel, sophisticated engineering undergird the nation’s infrastructure are being taxed to worrisome degrees by heat, drought and vicious storms. On a single day this month here, a US Airways regional jet became stuck in asphalt had softened in 100-degree temperatures, and a subway train derailed after the heat stretched the track so far that it kinked, inserting a sharp angle into a stretch that was supposed to be straight. In East Texas, heat and drought have had a startling effect on clay-rich soils under highways, which “just shrink like crazy,” leading to “horrendous cracking,” said Tom Scullion, senior research engineer with the Texas Transportation Institute at Texas A&M University. In Northeastern and Midwestern states, he said, unusually high heat is causing highway sections to expand beyond their design limits, press against each other and “pop up”, creating jarring and even hazardous speed bumps. Excessive warmth and dryness are threatening other parts of the grid as well. In the Chicago area, a twin-unit nuclear plant had to get special permission to keep operating this month because the pond it uses for cooling water rose to 102 degrees; its license to operate allows it to go only to 100. According to the Midwest Independent System Operator, grid operator for the region, a different power plant had had to shut because the body of water from which it draws its cooling water had dropped so low that the intake pipe became high and dry; another had to cut back generation because cooling water was too warm. The frequency of extreme weather is up over the past few years, and people who deal with infrastructure expect to continue. Leading climate models suggest weather-sensitive parts of infrastructure will be seeing many more extreme episodes, along with shifts in weather patterns, rising maximum (and minimum) temperatures. “We’ve got ‘storm of century’ every year now,” said Bill Gausman, a senior vice president and a 38-year veteran at Potomac Electric Power Company, which took eight days to recover from the June 29 “derecho” storm that raced from Midwest to the Eastern Seaboard and knocked out power for 4.3 million people in 10 states and the District of Columbia. In general, nobody in charge of anything made of steel and concrete can plan based on past trends, said Vicki Arroyo, who heads Georgetown Climate Center at Georgetown University Law in Washington, clearinghouse on climate-change adaptation strategies. Highways, Mr. Scullion noted, are designed for local climate, taking into account things like temperature and rainfall. “When you get outside of those things, man, all bets are off.” As weather patterns shift, “we could have some dramatic failures of highway systems”. Adaptation efforts are taking place nationwide. Some are as huge as the multibillion-dollar effort to increase height of levees and flood walls in New Orleans because of projections of rising sea levels and stronger storms to come; others as mundane as resizing drainage culverts in Vermont, where the Hurricane Irene damaged about 2.000 culverts. “They just got blown out,” said Sue Minter, the Irene recovery officer for the state (…..)



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Consultor Internacional

One Response to Weather Extremes Leave Parts of U.S. Grid Buckling

  1. Professor Uziel Nogueira says: The article does a good job in explaining the engineering effects of weather change on the sophisticated (but old) US infrastructure system. However, a fundamental issue is not addressed. That is, HOW MUCH additional spending is required to pay for repairing/improving the system subject to punishing climate changes. In the past, there was plenty of money to pay for it. In times of declining revenues, budget deficits and huge public debt, local governments will face tough choices. For example, maintain the infrastructure working and safe or carry on popular social services to the poor.


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