GRANTS PASS, Ore. (AP) -- A new government report shows that many of Oregon's beaches are eroding faster than in recent decades, through a combination of less sand coming out of rivers, rising sea levels and bigger waves.

The U.S. Geological Survey study released Monday is part of a nationwide assessment of coastal erosion.

It found that since the 1960s, 13 of 17 stretches of beach in Oregon have changed. They went from building up sand to eroding, eroding faster than before, or building up less than before.

Lead author Paul Ruggiero is an associate professor at Oregon State University. He says the primary reasons are less sediment flowing down coastal rivers, sea levels rising due to climate change, and bigger ocean waves, particularly during winter storms.

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