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To dive safely, it is suggested that the diver have a working knowledge of waves, tides, currents, and water quality. Lack of understanding and respect for ocean currents and surf can be of serious consequence to the diver. This paper on the diving environment is designed to provide the diver with a general understanding of the physical characteristics common to lakes and oceans. The descriptions of diving techniques are included to give the diver a better understanding of how to safely handle himself/herself under various conditions. The discussions include: (1) waves at sea; (2) waves in shallow water; (3) surf; (4) currents; (5) sandy beach entry; (6) rocky shore entry; (7) tides and tidal currents; (8) wind currents; (9) seiches; (10) diving in currents; and (11) weather. The document concludes that good physical condition, basic knowledge, common sense, and good judgment can be very important for safe underwater exploration. (CW)

To retain maritime security, an up-to-date database of mine countermeasures route surveys is essential. In 2005, the United Kingdom Hydrographic Office (UKHO) developed a GIS weighted suitability model to determine survey periodicity; allowing optimization of survey resources, increasing time and cost efficiency. The U.S. currently has no such model. Bedforms are an integral part of the survey periodicity problem. Sediment grain size, tides, currents, and wind-generated waves are influential in bedform formation. In this thesis, San Francisco Bay was chosen as a case study. To investigate if sediment properties change over time, localized grab samples for a three-year period were analyzed. The analysis showed little variability in sediment characteristics at a given location. A weighted suitability model based on the UKHO model was constructed. Three layers were developed including sediment grain size, interpolated from 174 grab samples, tidal and current data from over 50 current stations and ripple height inferred from wind generated wave height. A weighting for each layer was determined. Regions indicating the presence of bedforms were assigned a low survey periodicity, as bedforms reduced, survey periodicity was increased. High-resolution multi-beam survey data was used as a comparison and validation, this showed extremely good correlation with the model.

To retain maritime security, an up-to-date database of mine countermeasures route surveys is essential. In 2005, the United Kingdom Hydrographic Office (UKHO) developed a GIS weighted suitability model to determine survey periodicity; allowing optimization of survey resources, increasing time and cost efficiency. The U.S. currently has no such model. Bedforms are an integral part of the survey periodicity problem. Sediment grain size, tides, currents, and wind-generated waves are influential in bedform formation. In this thesis, San Francisco Bay was chosen as a case study. To investigate if sediment properties change over time, localized grab samples for a three-year period were analyzed. The analysis showed little variability in sediment characteristics at a given location. A weighted suitability model based on the UKHO model was constructed. Three layers were developed including sediment grain size, interpolated from 174 grab samples, tidal and current data from over 50 current stations and ripple height inferred from wind generated wave height. A weighting for each layer was determined. Regions indicating the presence of bedforms were assigned a low survey periodicity, as bedforms reduced, survey periodicity was increased. High-resolution multi-beam survey data was used as a comparison and validation, this showed extremely good correlation with the model.

SOUND FILMSTRIP IS AN AT-RISK MEDIA FORMAT. I am the only person on earth preserving American filmstrips. The media format is largely forgotten and very endangered. If you have any American filmstrips, or can rescue any filmstrips from a school, college, business, industry, or elsewhere, please contact me immediately at [email protected] . Don't know what a filmstrip is? Read: https://en.wikipedia.org/wiki/Filmstrip I AM AN INDEPENDENT MEDIA PRESERVATIONIST. If you enjoy my work please consider making a donation toward my operating expenses. Visit https://uncommonephemera.org/donate for links to Patreon, GoFundMe, and more. PART OF A SERIES. This filmstrip was part of the series Understanding Oceanography. ORIGINAL SCANS AND AUDIO INGEST INCLUDED. The original frame scans and audio capture are included in this archive. STAY IN TOUCH. Join my Discord for announcements on new releases and live streams, discussion with other people interested in media preservation, or if you can help in any way. For more information about Uncommon Ephemera, filmstrips, my media preservation processes, file specifications, contact information, and attribution information, please see the included “Read Me.txt” file.

To retain maritime security, an up-to-date database of mine countermeasures route surveys is essential. In 2005, the United Kingdom Hydrographic Office (UKHO) developed a GIS weighted suitability model to determine survey periodicity; allowing optimization of survey resources, increasing time and cost efficiency. The U.S. currently has no such model. Bedforms are an integral part of the survey periodicity problem. Sediment grain size, tides, currents, and wind-generated waves are influential in bedform formation. In this thesis, San Francisco Bay was chosen as a case study. To investigate if sediment properties change over time, localized grab samples for a three-year period were analyzed. The analysis showed little variability in sediment characteristics at a given location. A weighted suitability model based on the UKHO model was constructed. Three layers were developed including sediment grain size, interpolated from 174 grab samples, tidal and current data from over 50 current stations and ripple height inferred from wind generated wave height. A weighting for each layer was determined. Regions indicating the presence of bedforms were assigned a low survey periodicity, as bedforms reduced, survey periodicity was increased. High-resolution multi-beam survey data was used as a comparison and validation, this showed extremely good correlation with the model.

To retain maritime security, an up-to-date database of mine countermeasures route surveys is essential. In 2005, the United Kingdom Hydrographic Office (UKHO) developed a GIS weighted suitability model to determine survey periodicity; allowing optimization of survey resources, increasing time and cost efficiency. The U.S. currently has no such model. Bedforms are an integral part of the survey periodicity problem. Sediment grain size, tides, currents, and wind-generated waves are influential in bedform formation. In this thesis, San Francisco Bay was chosen as a case study. To investigate if sediment properties change over time, localized grab samples for a three-year period were analyzed. The analysis showed little variability in sediment characteristics at a given location. A weighted suitability model based on the UKHO model was constructed. Three layers were developed including sediment grain size, interpolated from 174 grab samples, tidal and current data from over 50 current stations and ripple height inferred from wind generated wave height. A weighting for each layer was determined. Regions indicating the presence of bedforms were assigned a low survey periodicity, as bedforms reduced, survey periodicity was increased. High-resolution multi-beam survey data was used as a comparison and validation, this showed extremely good correlation with the model.

Contractor reports on renewal ocean energy sources  prepared for, and published by, the US Congress' Office of Technology Assessment.  Pages 51 and 68, which contained figures reprinted from elsewhere with active copyright and "all rights reserved" notices, have been omitted from this copy. Those pages did not contain any text from the working papers themselves.

Delia (1592) is a cycle of Petrarchan love sonnets written by Renaissance poet Samuel Daniel (1562-1619). He was also a noted playwright and historian, and a close contemporary of Ben Jonson and William Shakespeare. Delia may have influenced Shakespeare’s sonnets. This project contains the first 30 sonnets from the collection "Delia". (Summary by Dr Alan Weber)