Distridution of suspended materials in Chesapeake Bay

The distribution of suspended materials in Chesapeake Bay and its tributaries, discussed in terms of light extinction, is characterized by marked variability. There are large local time changes, seasonal and tidal, as well as large horizontal gradients...

Interpretation of spectrophotometer readings on Chesapeake Bay waters

Numerical results of the Mie theory of scattering of light energy by suspended particles have been applied to light extinction measurements obtained from waters of Chesapeake Bay and its major tributaries. A Beckman Model DU Quartz Prism Spectrophotometer with 10 and 50 cm liquid absorption cells was used on raw and filtered samples to determine the extinction as a function of wave length. Extinction in these waters is primarily due to absorption and scattering by suspended materials...

A light-scattering diagram

A diagram is presented which shows the light scattering effectiveness of small particles when they are suspended in water. The effective scattering is plotted as a function of the radius of the particles (0.005 to 5 µ), of the wave length of the energy being scattered (0.35 to 0.8 µ), and of the relative refractive index of the material in the particle when compared to water (1.02 to 1.40). The diagram covers the range of variables for most fine materials which are found suspended in natural waters

An inexpensive and rapid technique for obtaining current profiles in estuarine waters

A current indicator, consisting of a confined submerged biplane-shaped drag and a device for reading the angle made by the suspending wire with t he vertical, is introduced in t heory and practice. It was designed for rapid determination of current velocities and directions at any depth from a vessel an chored in shallow water. A number of calibration runs made with t he Drag and with a von Arx Current Meter indicate that the Drag is reliable and suffi ciently accurate for the purpose for wluch it was designed. The gear proved to be rugged, easy to use, and inexpensive. It requires little time to make a number of observations from the surface down to 50 feet

Results of trip to Snake River : 28 September - 4 October 1957

The mail boat trip was taken from Lewiston to Hells Canyon and return. Bathythermograph observations were made in deep holes at Buffalo Eddy, Nez Perce Dam site, and near Mountain Sheep Dam site. Thermograph sites on the Grande Ronde River were evaluated. A number of lakes, reservoirs, and dams were visited enroute to Lewiston

Hydrography of Oregon estuaries : prior to June 1956

Most of the readily available unpublished hydrographic data for Oregon Estuaries which was collected prior to June 1956 have been tabulated, Data on water temperature salinity and velocity are presented. Data collected by the Navy Hydrographic Office and the USC & GS are not included.The data presented in this report consists of hydrographic information for ten Oregon estuaries. Most of these data were collected under the present contract with the assistance of personnel and equipment from the Shell Fish Laboratory of the Oregon Fish Commission under the direction of Mr. L. D. Marriage. Other data were collected by the Corps of Engineers. The locations of the estuaries are shown on the map on the cover

Evidence for roll vortices associated with a land breeze

Time series measurements from an array of meteorological buoys off the Oregon coast displayed periodicities that suggest the presence of atmospheric roll vortices. The roll vortices were associated with nocturnal land breezes, cool air masses moving slowly seaward through the buoy array under the prevailing longshore wind of marine air. It appears that buoyancy and shear are the mechanisms responsible for the observed rolls

Use of on-line computers in environmental research

A real-time data acquisition/central system has been developed for environmental monitoring and research. The basic elements of the system are a large instrumented spar buoy, a computer which controls data acquisition through a telemetry link and simultaneously files and analyzes the data, and the investigator who prescribes appropriate sets of computer operations. The system has particular advantages for real-time operational decision making and for nonstandard environmental investigations

Heat budget terms for middle Snake River reservoirs

Final report.Graphs are presented which show the computed mean daily heat transfer across reservoir surfaces due to processes of absorption and reflection of solar radiation, back radiation, conduction, and evaporation. Reservoirs near Lewiston, Idaho, and near the Oxbow Dam site on the Middle Snake River are considered

Flushing of pollutants in the Yaquina River Estuary

This report vas prepared at this time at the suggestion or the Director of Research of the Oregon Fish Commission. Most of the data upon which it is based were collected by Mr. L. D. Marriage and his assistants of the Oregon Fish Commission. These data are scheduled to be included in a data report in the present series of reports. The purpose of this study is to estimate the time and space distribution which pollutants would assume if they were introduced at various places in the Yaquina Bay and River system