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Shifting Shoals and Shattered Rocks: How Man Has Transformed the Floor of West-Central San Francisco Bay (With 3-D Map Supplement).
| 题名： | Shifting Shoals and Shattered Rocks: How Man Has Transformed the Floor of West-Central San Francisco Bay (With 3-D Map Supplement). |
| 作者： | CARLSON, P. R.; CHIN, J. L.; WONG, F. L. |
| 关键词： | ROCKS; SHOALS |
| 摘要： | The San Francisco Bay estuary consists of three subembayments- north bay (San Pablo and Suisun Bays), central bay, and south bay-each characterized by a central area of open water surrounded by intertidal mudflats and marshes. Central bay includes Alcatraz and Angel Islands and also a number of submerged bedrock knobs that protrude through the sediment of the bay floor and rise to within about 40 feet (12 m) of the water surface. The most prominent of these are Harding, Shag, Arch, and Blossom Rocks. These rocks have been lowered by blasting several times in the past, but they remain a potential hazard to shipping because newer cargo vessels are designed with increasingly deeper drafts. Central bay's location adjacent to two major population and commerce centers, San Francisco and Oakland, subjects it to greater human influences than less developed parts of the estuary. The western part of central San Francisco Bay is adjacent to the Golden Gate, the estuary's outlet to the Pacific Ocean. The changing submarine topography of the west-central bay, as well as its geology, form the main focus of this book. |
| 报告类型： | 科技报告 |
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