Spring Breakup of the Delta River, Alaska.
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H
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Spring breakup of snow and ice on the Delta River, Alaska, was monitored in 1967. Breakup on this braided river was a relatively calm event, with gradual development of open-water channels from headwaters to mouth. Air temperature data at Big Delta, near the mouth of the river, indicated an accumulation of 30 positive degree-days F above 32F, using mean daily values, prior to first observation of continuous open water from headwaters to mouth a corresponding value, but using maximum daily air temperatures, was 224 degree-days F. A photographic sequence of breakup at several points along the river is included. Author
- Snow, Ice and Permafrost