摘要:

Microseisms with periods from five to eight seconds recorded by long‐period instruments at stations near the Pacific coast from November 29, 1951 to January 4, 1952 are discussed in their relation to meteorological conditions, ocean waves, and microbarom

ISSN:0002-8606    

DOI:10.1029/TR034i002p00161

年代:1953

数据来源: WILEY

摘要:

The tidal variations of gravity have been observed throughout intervals of several weeks to several months at Los Angeles, Pasadena, Hawaii and Attu. The term produced solely by the yielding of the Earth (including its oceans) may conveniently be characterized by two parameters. One parameter expresses the time‐phase, the other the amplitude. In the most extensive and reliable series of observations, at Pasadena and Los Angeles, these parameters were found to be nearly constant in time. Geographically, however, the phase shifts differ greatly at widely separated stations. Knowledge of the phase and amplitude parameters (when constant) enables the classical harmonic tidal constituents to be easily computed. Computation of the gravity tidal constituents for the Pasadena and Los Angeles data were carried through by the proposed simplified method, and compared with corresponding results obtained with the standard U.S. Coast and Geodetic Survey and British Admiralty computational procedures. Satisfactory agreement was obtained among the three method

ISSN:0002-8606    

DOI:10.1029/TR034i002p00174

年代:1953

数据来源: WILEY

摘要:

The magnetic field of an oscillating horizontal magnetic dipole on the surface of a homogeneous Earth is calculated. For lower frequencies, where displacement currents can be neglected, the magnetic field on the surface of the Earth can be represented in terms of transcendental and cylindrical functions. Particular attention is paid to the vertical component, which vanishes as the conductivity of the Earth approaches zero. An explicit formula is given for the value of this component in parametric form involving the conductivity, frequency, and distance to the observer. The magnetic field components tangential to the Earth's surface are also considered.

ISSN:0002-8606    

DOI:10.1029/TR034i002p00185

年代:1953

数据来源: WILEY

摘要:

A method of relating the frequency of six tenths or more sky cover to the frequency of various ceiling heights is presented to show how the latter may be estimated in areas where only total sky cover has been observed and recorded. Tests show that the method has significant value above 1000 ft.

ISSN:0002-8606    

DOI:10.1029/TR034i002p00189

年代:1953

数据来源: WILEY

摘要:

An investigation into the effect of the wind on the elevation of the water level of Ringköbing Fjord, Denmark, has provided a check on the general theory of the wind effect on lakes previously published by the author

ISSN:0002-8606    

DOI:10.1029/TR034i002p00194

年代:1953

数据来源: WILEY

摘要:

Measurements of the reflection of diffuse solar radiation from the sea surface under a cloud cover are somewhat higher than Judd's theoretical value of 6.6 per cent for reflection of diffuse radiation by a flat water surface. Schmidt's usually accepted theoretical value of 17 per cent does not apply, and when his derivation is re‐examined it leads to the same value as Judd'

ISSN:0002-8606    

DOI:10.1029/TR034i002p00199

年代:1953

数据来源: WILEY

摘要:

Soil‐moisture records from plots on potential range lands in California on which native vegetation, mostly woody brush species, was left intact, and from adjacent plots which were denuded by burning, were obtained for several years. Samplings, by which the amounts of soil moisture could be measured quantitatively, were taken with soil tubes generally under extremely difficult conditions at intervals frequently enough to give a satisfactory picture of the water regimen of the area. Over 23 paired plots were used in the experiments. They were selected to give a wide variety of vegetative types, rainfall patterns, topography, and soils. At all of the sites the rain generally fell from October through March; most of it was in December, January, and February. The growth of the plants, therefore, was dependent to a large extent upon the amount of water that could be stored in the soil mantle. Following the fire, grasses and forbs usually succeeded the brush, but, with some species, several annual burnings were necessary before it was eliminated. The removal of the brush resulted in saving of moisture. The soil was at a higher moisture content in the burned plots than in the unburned at the end of the growing season; consequently, less water was required to restore the soil in the burned plots to its field capacity. In most cases the results led to the conclusion that appreciable savings of water could be effected by burning to substitute grasses or forbs which have forage value. The soil‐moisture records show that the soil in the burned areas was wet to its field capacity as early and, in many cases, earlier than in the unburned ones, thus indicating that the permeability of the soil for water was not adversely affected by burn

ISSN:0002-8606    

DOI:10.1029/TR034i002p00201

年代:1953

数据来源: WILEY

摘要:

A dimensionless open‐channel resistance diagram based on an existing diagram given by Moody for circular pipes is presented. Data was taken on a 90‐degree triangular flume in smooth and roughened condition from actual open‐channel flow data. A comparison of the two diagrams presented is made by computing average velocities for several hypothetical channels. Correlation was found to be

ISSN:0002-8606    

DOI:10.1029/TR034i002p00213

年代:1953

数据来源: WILEY

摘要:

Reinvestigation of reported glacial deposits in the Colorado Front Range area, in locations above or exterior to those commonly classed as glaciated, has resulted in a doubling of the number of known deposits, and the finding of a rough gradation from glacial, near the Arapaho Massif; through reworked glacial, at distances of six or seven miles; to glacio‐fluviatile and fluviatile at greater distances. From this evidence, one or more early Pleistocene glaciations are postulated, the parent ice body being of the ice‐cap type, resting upon a gently rolling terrain of which only the so‐called peneplain surfaces now remain. A similar large ice cap in the Laramie‐Poudre area is suggested by scattered evidence between those river s and the Laramie‐Fort Collin

ISSN:0002-8606    

DOI:10.1029/TR034i002p00220

年代:1953

数据来源: WILEY

摘要:

A method for the disposal of industrially polluted effluent—by woods irrigation—is described, and the results of hydrologic investigations during the first year of operation are evaluated. It was found that the spraying of 400 to 600 inches depth of water on the woods area did not harm the vegetation, clog the soil, or result in saturation of the area. A maximum of about 50 million gallons of water were removed from the selected 180‐acre disposal area weekly by ground‐water discharge and evapotranspiration. Analyses of well water from the woods area showed no indication of pollution as a result of the disposal op

ISSN:0002-8606    

DOI:10.1029/TR034i002p00227

年代:1953

数据来源: WILEY