Showing papers on "Disdrometer published in 1974"

Rainfall Measurements During Hurricane Agnes by Three Overlapping Radars

Abstract: As part of the International Field Year for the Great Lakes, rainfall measurements were made for hurricane Agnes over the Lake Ontario watershed by two C-band radars and one S-band radar. Two dense networks of raingages were located in radar overlap areas. One of the networks contained a raindrop disdrometer for measuring the number and size of drops. Comparison between radar and gage rainfall measurements show there is considerable time and space variability in the accuracy of the radar rainfall estimates. Because of the high correlation between radars measuring rain over the same area, it is concluded that this observed variability is due to meteorological causes rather than radar measurement errors. The Z-R relationship as measured by the disdrometer remained constant throughout the storm; thus, it is improbable that the variability in the radar accuracies resulted from changes in the Z-R relationship. Some of the larger radar overestimates could be attributed to evaporation below the radar be...

The Measurement of Charge and Size of Raindrops: Part I. The Disdrometer

Abstract: An apparatus is described which enables reliable measurement of precipitation charge and size to be made. Design criteria are thoroughly treated and general solutions are provided to all aspects of the problem. The theories allow the performance of the apparatus in relation to drop splashing, drop overlap, and finite sampling time to be estimated with confidence. Full constructional details and performance of the apparatus and associated data storage equipment operating under strict laboratory conditions is given.