Entry from Directory of Selected Israeli Water-related Projects

TITLE:	Improvement of rainfall measurement by means of radar
PROBLEM:	Statistical analyses and theoretical considerations indicate that artificial cloud seeding may have different effects on the same cloud under different conditions, as well as on different simultaneously present clouds. Hence, the need for a method that enables an evaluation of the effectiveness of cloud seeding at the scale of individual clouds. Radar is the only device by which one can measure and trace the development of precipitation in individual clouds.
OBJECTIVES:	Further development of accurate methods which enable a quantitative assessment of rainfall from radar measurements. The methods are being developed in cooperation with a NASA project designed to launch into space a radar system for measuring precipitation. Being in the range of measurement of the satellite, Israel will serve as a validation station on the ground.
APPROACH:	Development of a mathematical model for a quantitative assessment of rainfall from radar measurements by way of fitting probabilities to the distribution of intensities - “the method of classified windows” - CWPMM. Collection of synchronic raingauge and radar measurements including placement of digital rainfall recorders. Processing of the data to obtain a quantitative estimation of rainfall from radar measurements on the basis of synchronized data by means of the CWPMM method.
BEGINNING DATE:	1.5.1995
ENDING DATE:	1.5.1998
COMMENTS ON DATES:
CURRENT PROGRESS:	Development of the required mathematical models and processing of the radar data and rainfall data from the 1994/95 rainfall season.
PRINCIPAL INVESTIGATOR NAME:	Daniel Rosenfeld
ADDRESS:	Department of Atmospheric Sciences, Hebrew University, Jerusalem
TELEPHONE:	972-2-585821
TELEFAX:	972-2-662581
EMAIL:

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