Pluviograph


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pluviograph

[′plü·vē·ə‚graf]
(engineering)

Pluviograph

 

an instrument for recording the quantity, duration, and intensity of precipitation.

Figure 1. A pluviograph chart

The pluviographs used in the USSR consist of a cylindrical receiving vessel with an area of 500 sq cm. When fluid precipitation flows from the vessel through a drain pipe into the water-collecting chamber, it causes movement of a float that is connected to a pointer. When the chamber is filled with water, the float rises and engages a mechanism that provides for forced discharge of the water through a siphon into a pail. The precipitation that has occurred is recorded on a special chart attached to a drum, which is rotated by a clock mechanism. The vertical lines (see Figure 1) correspond to the time, and the horizontal lines to the amount of precipitation. The record begins at the lower boundary of the chart (at zero); when the chamber is full (10 mm of precipitation), the pen reaches its upper limit, the discharge takes place, and the record begins again at zero.

REFERENCE

Sternzat, M. S. Meteorologicheskie pribory i nabliudeniia. Leningrad, 1968.

S. I. NEPOMNIASHCHII

References in periodicals archive ?
2 indicate that the pluviographs measured significantly less precipitation than the automated weather stations.
The pluviographs showed a weak maximum in the early morning.
For simplicity, we call rainfall intensity data at short time intervals ([less than] 30 min) pluviograph data, as distinct from daily rainfall data.
In areas where long term pluviograph data are not available, the R-factor may be estimated using mean annual rainfall or the Modified Fournier Index (e.
To refine and update the spatiotemporal variations, the aims of this study were to provide (i) rainfall erosivity values calculated using 6-min pluviograph data (Bureau of Meteorology 1989) from NSW; (if) site-specific parameter values for improved parameterisation for NSW for the standard 30-year climatology of 1961-90 as the reference period of climate normals (Bureau of Meteorology 2007); (Hi) time-series rainfall erosivity maps for NSW at monthly and annual interval at a high spatial resolution (100 m); and (iv) an impact analysis of rainfall on rainfall erosivity and hillslope erosion.
The R-factor and its monthly distributions were calculated using a daily rainfall erosivity model (Yu and Rosewell 1996) that predicts R on the basis of an empirical relationship between R-factor calculated using pluviograph rainfall data and daily rainfall amount.
year were derived from pluviograph records from 29 stations in Victoria, spanning 346 complete station years.
For simplicity, we call, henceforth, rainfall intensity data at short time intervals (<30-min) pluviograph data, as distinct from daily rainfall data.
For this study, we have assembled weather data for Gunnedah from the following sources: (1) on-site daily rainfall, and maximum and minimum temperature recorded manually; (2) digitised pluviograph data at 6-min intervals; (3) complete DataDrill data set since 1957 for the site (QCCA 1998); and (4) global radiation data estimated using geo-stationary meteorological satellites (GMS) (Gautier et al.
The tropics of Australia is one of only few tropical regions in the world where pluviograph data, also known as breakpoint data, for periods of more than 20 years are available to compute the R-factor as originally recommended (Wischmeier and Smith 1978).
The research covered rainfall data from 1950 to 1985 and was based on the analysis of 162 pluviographs, supported by 809 additional rainfall stations due to the reduced number of continuous recording rain gauges.