- 行业: Weather
- Number of terms: 60695
- Number of blossaries: 0
- Company Profile:
The American Meteorological Society promotes the development and dissemination of information and education on the atmospheric and related oceanic and hydrologic sciences and the advancement of their professional applications. Founded in 1919, AMS has a membership of more than 14,000 professionals, ...
Ratio of the cross-sectional area of the flow at a point in an open channel or closed conduit to the wetted perimeter, that is, R = A/P.
Industry:Weather
Rainfall intensity–duration–frequency curves describe the rainfall intensity for a given exceedance probability over a range of durations. They are important for the design of many facilities when it is not clear what the critical duration will be. Often a family of curves is provided where each curve corresponds to the duration– intensity relationship for a specific exceedance probability.
Industry:Weather
Rain with a rate of accumulation exceeding a specific value that is geographically dependent.
Industry:Weather
Radar designed for investigating the structure of the ionosphere by measuring the properties of the echoes returned from the ionosphere. Such radars operate in the HF part of the radio frequency band.
Industry:Weather
Quantum radiation (particles or photons) of high penetrating power, typically of high frequency and short wavelength. A 10-cm thickness of lead is usually used as the criterion upon which the relative penetrating power of various types of radiation is based. Hard radiation will penetrate such a shield; soft radiation will not.
Industry:Weather
Radar operating at wavelengths of 10–100 m with the received signal being scattered by ocean waves of half the radar wavelength. The received signal is Doppler shifted by an amount corresponding to the phase speed of this ocean wave component. The surface current in the radial direction can be computed from the difference between the observed Doppler shift and that which is expected from the surface-wave dispersion relation. See also Doppler radar, marine radar, microwave radar, synthetic aperture radar.
Industry:Weather
Procedure used to analyze and monitor atmospheric conditions by studying the heights of fixed pressure levels.
Industry:Weather
Procedure of computing the downward movement of water through an unsaturated bed by taking into account stepwise movement of the wetting front and the changes of water stored in each soil layer.
Industry:Weather
