Modeling of gradual earth-fill dam erosion

Author(s):  
Vijay P. Singh ◽  
Panagiotis D. Scarlatos
Keyword(s):  
1962 ◽  
Vol 52 (2) ◽  
pp. 181-234
Author(s):  
Karl V. Steinbrugge ◽  
William K. Cloud

ABSTRACT An extensive fault scarp system was formed during the Hebgen Lake earthquake of August 17, 1959 (11:37:15 p.m., M.S.T., Gutenberg-Richter magnitude 7.1). Bedrock beneath Hebgen Lake warped, rotated, and caused a seiche in the lake. A major landslide dammed Madison Canyon, causing a lake to form above the slide. An estimated 19 persons were buried by the slide. Other slides and rock falls took out sections of the main highway north of Hebgen Lake and closed many roads in Yellowstone Park. Small unit masonry structures as well as wooden buildings along the major fault scarps usually survived with little damage when subjected only to vibratory forces. The unit masonry buildings, in particular, had little or no earthquake bracing. Intensity at the major scarp has been given a Modified Mercalli Scale rating of X. However, the maximum intensity ratings based on vibratory motion even a few feet away from the scarps were VII or VIII. Within the limits of observation there was little or no reduction in vibratory intensity 5 to 10 miles away compared to that at the fault. This is not to say that the ground motions were similar. At the closest strong-motion seismograph station (Bozeman, 58 miles from the epicenter) maximum recorded acceleration was about 7 per cent gravity. The earthquake was generally felt in about a 600,000 square mile area, mostly north of the instrumental epicenter. The earth-fill Hebgen Dam was within 1000 feet of a major scarp. The dam was significantly damaged, but it continued to be an effective structure.


1979 ◽  
Vol 6 (3) ◽  
pp. 413-422
Author(s):  
R. R. Foster ◽  
T. J. Parent ◽  
R. A. Sorokowski

Eskimo Point, Northwest Territories, is a predominantly Inuit community of about 900 people, located on the west shore of Hudson Bay. Formerly, its water supply was obtained from nearby small, sometimes polluted, shallow lakes, which freeze to the bottom in winter, necessitating an ice-cutting operation. In 1973, a study was undertaken to investigate alternative methods of improving Eskimo Point's water supply. The recommended solution was the construction of a 6 500 000 gal (29 548 350 L) earth fill reservoir, lined with a hypalon membrane.Further field investigations and detailed design of the facility were carried out in 1974. All long-term delivery items were pre-ordered, and a general contractor was selected through public tender. Utilization of local manpower and equipment was specified.Construction commenced in mid-June of 1975 with the contractor providing on-the-job training to local Inuit, who adapted quickly to the equipment. Within 2 weeks, an all-local labour force was working around the clock constructing the reservoir embankments. Placement of a membrane liner of approximately 3.5 acres (1.4 ha) took 1 week, and was followed by placement of a protective layer of fill over the liner. Through good cooperation among owner, supplier, contractor, and engineer, the reservoir was completed in the fall of 1975 in time to be filled with water from a lake approximately 1 mi (1.6 km) away.


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