Geology topics

Verne R. Schneider

Publications and source records attributed to Verne R. Schneider.

3 recordsLinked to original sources

USGS1989

Guide for selecting Manning's roughness coefficients for natural channels and flood plains

Although much research has been done on Manning's roughness coefficient, n, for stream channels, very little has been done concerning the roughness values for densely vegetated flood plains. The n value is determined from the values of the factors that affect the roughness of channels and flood plains. In densely vegetated flood plains, the major roughness is caused by trees, vines, and brush. The n value for this type of flood plain can be determined by measuring the vegetation density of the flood plain. Photographs of flood-plain segments where n values have been verified can be used as a comparison standard to aid in assigning n values to similar flood plains.

Water Supply Paper↗

USGS1984

HYDRAULIC RESEARCH - U. S. GEOLOGICAL SURVEY.

Research at the Gulf Coast Hydroscience Center near Bay St. Louis, Mississippi, is being conducted in an indoor laboratory, and an outdoor laboratory. Much of the current indoor lab research is directed at improved methods of measuring flow. A towing tank and submerged jet tank are used for calibrating velocity meters. The outdoor laboratory consists of a flood-plain simulation facility. Much emphasis has been placed on applying results to the development of numerical simulation models. Laboratory data are used to develop and validate the models. These models are also validated with actual field data. Various algorithms for one- and two-dimensional flow and transport models based on finite difference and finite element schemes are being developed.

Conference Paper↗

USGS1976

Development of a standard rating for the Price pygmy current meter

Fifty new Price pygmy current meters, 50 used Price pygmy meters with used rotors, 50 used Price pygmy meters with new rotors, and 26 used Price pygmy meters with straight uniform (nonbeaded) contact wires were rated individually in a towing tank. A standard rating of V =0.961 N +0.039 ( V =0.293 N +0.012), where V is the velocity in feet per second (metres per second) and N is the meter rotation in revolutions per second, was established for the group of new meters. Repeated ratings of two new meters showed that under the best rating conditions, the individual Price pygmy rating is repeatable to within 1 percent. The standard errors of velocities predicted using the individual ratings and the standard ratings were compared. The use of the standard rating resulted in statistically higher standard errors than the individual ratings for all groups of meters. However, the differences are a fraction of 1 percent higher and are not of concern for practical purposes. The individual ratings and standard rating for the used meters with new straight contact wires were found to be statistically similar to the ratings for the new meters. Continuation of the use of individual ratings of Price pygmy current meters is probably unnecessary with the implementation of precise standards in their manufacture, rating of a random sample, and use.

Journal of Research of the U.S. Geological Survey↗