Accession Number : AD0724683

Title :   Spring Breakup of the Delta River, Alaska.

Descriptive Note : Special rept.,

Corporate Author : COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H

Personal Author(s) : Slaughter,C. W. ; Samide,H. R.

Report Date : APR 1971

Pagination or Media Count : 37

Abstract : 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)

Descriptors :   (*RIVERS, *ALASKA), (*ICE, RIVERS), SNOW, ATMOSPHERIC TEMPERATURE, PERIODIC VARIATIONS, MONITORS, FAILURE(MECHANICS), FREEZING, MELTING, PHOTOGRAPHY

Subject Categories : Snow, Ice and Permafrost

Distribution Statement : APPROVED FOR PUBLIC RELEASE