Characterizing Rainfall Simulators by Raindrop Size Distribution Measurements and Fall Velocity Estimates
Description
This dataset contains the processed experimental data for the research article: "Characterizing Rainfall Simulators by Raindrop Size Distribution Measurements and Fall Velocity Estimates" The data was collected to evaluate and compare different methods for measuring raindrop fall velocity in laboratory settings, specifically for drip-type and pressurized rainfall simulators. The core purpose was to assess the reliability of an empirical velocity relationship (Eq. 1 in the paper) against a direct photographic technique and Parsivel² optical disdrometer. The dataset is organized into two main blocks corresponding to the experimental setups. Drip-type Rainfall Simulators. For each experimental conditions (raindrop diameter, D (cm), and falling height, h (m)), the following variables were obtained: - vD (m/s): Fall velocity measured by the photographic technique. - vcalc (m/s): Fall velocity calculated using the empirical relationship (Eq. 1). - vi, P (m/s): Fall velocity measured by the Parsivel² disdrometer. Pressurized Rainfall Simulator. Two different pressures were examined (P= 0.26 bar, P= 0.51 bar) for the same raindrop falling height (h=1.63 m). For each experimental condition, the following variables were obtained: - vcalc (m/s): Fall velocity calculated using the empirical relationship (Eq. 1). - vi, P (m/s): Fall velocity measured by the Parsivel² disdrometer.
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Steps to reproduce
The data in this dataset were generated through laboratory experiments using two types of rainfall simulators (drip-type and pressurized) installed in a dedicated support structure. Two different measurement techniques (weighing+photographic and disdrometric) were employed, and a recently proposed relationship for estimating the raindrop fall velocity as a function of their falling height and diameter (Eq. 1 in the text) was tested. Instruments: Drip-type rainfall simulators (Modified Kamphorst Simulator, MKS, and Drop Generator, DG), Pressurized rainfall simulator, OTT Parsivel² optical disdrometer, Photographic system (high-speed and high-framerate camera, LED lamp, measuring tape, opaque panel. Protocol for Drip-Type simulators (MKS, DG): the differences in measured raindrop diameter, drop count, rainfall intensity, and raindrop fall velocity between the weighing and photographic methods and the disdrometric technique were evaluated under various falling height conditions. In addition, raindrop fall velocity estimates from Eq. (1) were evaluated against both photographic and disdrometric measurements. Protocol for the pressurized simulator: continuous rainfall was generated from a fixed height (h= 1.63 m) at two stable operating pressures (P= 0.26 bar, P= 0.51 bar). For each experimental condition, the disdrometer was applied at 33 different sampling positions. Then, the mean fall velocity measured by the Parsivel² was compared with that calculated by Eq. (1).
Institutions
- Universita degli Studi di Palermo
Categories
Funders
- SAMOTHRACE, "SiciliAn MicronanOTecH Research And Innovation CEnter "SAMOTHRACE" (MUR, PNRR-M4C2, ECS_00000022), spoke 3 - Università degli Studi di Palermo "S2-COMMs - Micro and Nanotechnologies for Smart & Sustainable Communities"