In search of the Denny regrade: Fate of a Large Spoil bank in Elliott bay, Puget sound

R. Loeffler, M. Holmes, R. Sylwester
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引用次数: 1

Abstract

A large shoal located approximately 800 ft ( 2 5 0 m) off Seattle’s waterfront along the northeast shore of Elliott Bay in Puget Sound is attributed to offshore dunping of material from the Denny Hill Regrade, which occurred in two phases between 1898 and 1 9 3 1 . A compilation of hydrographic surveys dating from 1875 to 1 9 7 0 , together with recent marine geophysical data, 3 show the developnent of a bank and as ociated flank deposits whose v o l m ( 8 . 9 million yd / 6 . 8 million m ) canpares closely with that of estimates of the amount of materia3 removed durinfi the regrading operation ( 1 0 million yd / 7 . 6 million m ). Seismic records and available bottom samples suggest that the spoil bank is covered in places by a thin mantle of modern sediment, and that slunping of the steep flanks of the bank is contributing material to the central submarine valley in Elliott Bay. This spoil bank is being studied to determine its role and relationship to sediment distribution patterns and transport mechanisms in Elliott Bay. 5,
寻找丹尼退化:普吉特海湾艾略特湾一个大型废物银行的命运
在普吉特海湾的埃利奥特湾东北岸,距离西雅图海滨约800英尺(250米)的一个大浅滩是由于Denny Hill Regrade的海上倾倒物质造成的,这一现象发生在1898年至1931年的两个阶段。1875年至1970年的水文调查汇编,加上最近的海洋地球物理数据,3显示了一个河岸的发展和与之相关的侧面沉积物,其面积为1平方米(8)。900万码/ 6。800万立方米)与在选别过程中移出的物料量的估计(1000万立方米/立方米)非常接近。600万米)。地震记录和现有的海底样本表明,废弃河岸在某些地方被一层薄薄的现代沉积物地幔覆盖,河岸陡峭侧面的倾斜为埃利奥特湾中央海底山谷提供了物质。目前正在研究这一废土滩,以确定其作用及其与艾略特湾沉积物分布格局和运输机制的关系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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