199 resultados para United States. Coast Guard


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"March 5, 1906-read ; referred to the Committee on Coast Defenses and ordered to be printed."

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Along most of the U.S. east and gulf coasts from Long Island to the Mexican Border, bottom profiles extending over the Inner Continental Shelves normal from the coast display a characteristic two-sector shape. Near the coast, the 'shoreface' profile sector is steep and concave-up; the seaward 'ramp' sector is planar with a gradual slope away from the coast. As part of the Beach Evaluation Program at this Center, 9 profiles extending from the coast 30.5 km (19 miles) seaward at each of 49 localities were averaged to mathematically characterize the profiles and to develop and test criteria for discriminating among groups of profiles. Results indicate Inner Continental Shelf profiles can be mathematically defined by 4 parameters: a = ramp slope (0 - 0.00107); b = depth of the ramp at the shoreline, when the ramp is extended as a straight line below the shoreface sector (0 - 24.7 meters, 0 - 81 feet); c = distance from the shoreline to the shoreface-ramp boundary (0.2 - 20.6 km, 0.12 - 12.9 miles); and f = index of concavity of the shoreface sector (0.21 - 1.72). Values in parentheses are the range of values obtained for the 49 averaged profiles. An equation was developed to define bottom depth as a function of distance from shore incorporating these four parameters. Computed depths using the equation were found to be generally within 5% of actual profile depths. In most cases, no relationship was found between the geometric characteristics of the shoreface and the ramp.

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Published in newspaper format, <1865>.

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This publication replaces Special publication 149, Earthquake history of the United States exclusive of the Pacific region, 1928, and Special publication 191, Destructive and near-destructive earthquakes in California and western Nevada, 1934. cf. pt. II, p. 1.

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Includes bibliographies.

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1910, by R.L. Faris; 1915- , by D.L. Hazard (1935, with W.N. McFarland)

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Issues for <, Jan. 1895>-June 1922 called also whole no. <14>-190.

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Plates accompanied by guard sheets with descriptive letterpress.