Coastal sediments limit during earthquakes and tsunamis | Sweetened

The Portland Office of the U.S. Army Corps of Engineers keeps Oregon’s waterways safe and navigable by dredging sandbars and deepening shipping channels to ensure the safe transportation of more than $ 24 billion in the waterborne trade. For ships to pass the Columbia River, bulldozers must move 35,000 cubic yards of material every day. That’s about 3,500 regular dump trucks filled with sand every day. If you haven’t heard of the Columbia River Bar Pilots, find their story, they help all that traffic navigate the treacherous and dynamic sand bars.

Finally, the coastal estuaries are some of the most productive areas in nature. Studies have shown that estuaries are estimated to be on average $ 50 million per square mile per year in 2007 in dollars for all ecosystem services they provide to habitat and humankind. They are important for food, habitat, recreation, carbon sequestration, and more. Although the waves are not large in estuaries, wave attacks in marginal swamps with sea level rise cause erosion of muddy deposits of marshes. As sediments are eroded, water clarity decreases, nutrient loads (nitrogen and phosphorous) increase, and submerged plants and animals deteriorate.

In everyday life, sediment transport on beaches, inlets and estuaries is important to the ocean economy in Oregon. But this disaster preparedness chain revolves around disasters, so what about the expected earthquake in the Cascadia Subduction Zone? The Cascadia event is estimated to occur once every 300 years and is expected to trigger a magnitude 9 earthquake causing a tsunami. As a tsunami approaches the coast, its velocity will slow down as the water becomes less deep and to maintain mass, the wave height must grow, potentially 10 times its nautical height or more. People on the shore, in low-lying areas of the coast, and near estuary or tidal flats would be at greater risk.

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