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<br />00257~ <br /> <br />CONTRACTOR: Amos Eddy, Inc., Norman, Oklahoma <br />CONTRACT NO. 6-07-DR-20050 <br />PRINCIPAL INVESTIGATOR: Amos Eddy <br />PERIOD: December 1, 1975, to February 1, 1977 <br />FUNDING: FY76 - $9,683 <br />T.Q. - $3,683 <br /> <br />This study provided an optimal sampling objective analysis and <br />processed data display for the HIPLEX design. <br /> <br />Principal findings are: <br /> <br />(1) Surface rain gage data can be combined with radar reflec- <br />tivity data to analyze the total surface rainfall within objec- <br />tively determined confidence limits. <br /> <br />(2) A limi'ted gage network, more sparse than that required to <br />produce a satisfactory independent analysis but adequate to <br />"calibrate" the radar reflectivities, can be defined. This in <br />turn, produces a satisfactory analysis of surface total rainfall. <br /> <br />(3) Evidence confirms that patterns of rainfall are provided by <br />the radar data while the magnitudes are measured by the gage <br />data. <br /> <br />(4) The covariance function climatology will give a strong <br />indication of the preferred sensor deployment along and across the <br />storm motion. <br /> <br />(5) The marginal increase in analysis accuracy as the surface <br />gage density is increased is shown (a) for the case when no radar <br />data are available and (b) for the case when radar data are <br />available. <br /> <br />(6) Analysis of variance results indicates that the attentuation <br />associated with the 5-cm radar data used is considerably less than <br />that caused by other vari ables in an "average" storm, but could <br />have a considerable effect on the objective analysis estimate of <br />rain "behind" the heavy rainstorms. <br /> <br />II 1-24 <br />