Objective C haracterize simulated rainfall and establish relationship between kinetic energy and intensity Data and method Dropformer type of rainfall simulator and Laser Precipitation Monitor optical distrometer were used in the study Rainfall of 20 different intensities 15 to ID: 1024964
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1. Application of Optical Disdrometer to Characterize Simulated Rainfall and Measure Drop Size Distribution Objective: Characterize simulated rainfall and establish relationship between kinetic energy and intensity.Data and method: Drop-former type of rainfall simulator and Laser Precipitation Monitor (optical distrometer) were used in the study. Rainfall of 20 different intensities (1.5 to 202 mm/h) were simulated, and the sensor’s software and excel program was used to further analyze the data. Results: The median volume drop diameter (D50) and kinetic energy of the simulated rain are found to be higher than the natural rain for all rainfall intensities. A power and polynomial function provided strong relation between KEt and intensity with coefficient of determination (R2) value of 0.99 and 0.98 (P < 0.0001), respectively; while, the best fit relationship between KEvol and intensity was found to be power-law function (R2=0.95; P<0.001). Similarly, power law function showed the most suitable relationship (Z=aRb) between radar reflectivity (Z) and rainfall intensity (R).Figure 1. Top and side schematic view of drop former type of rainfall simulator (Arid Dome, ALRC)Figure 2. Operational mode of optical distrometer (LPM)Figure 3. A fitting curve between flow rate and intensity (RS calibration)Figure 4. Relationship between intensity and median volume drop diameter (simulated vs. natural rain)Figure 5. Fluctuation of rainfall rate in high rainfall intensity (128 mm/h)Figure 7. Relationship between drop diameter (D) and terminal velocity (compare simulated and natural rainfall) Derege Tsegaye MesheshaEGU Conference,Vienna, Austria April 27, 2017Drop size (X) Vs. Velocity (Y)Time (X) Vs. Intensity (Y) Authors: Derege Meshesha1,3*, Atsushi Tsunekawa1, Nigussie Haregeweyn2, Enyew Adgo3, 1Arid Land Research Center, Tottori University , 2International Platform for Dryland Research and Education, 3Department of Natural Resources Management, Bahir Dar University, Bahir Dar, EthiopiaFigure 6. Volume of water contributed by different drop sizes