The Variability of Raindrop Size Distribution in Small Scale due to Urban Land-Use Difference: A Case Study of the "7.16" Storm in Beijing
Abstract
Raindrop size distribution (RSD) information plays an important role in cloud microphysics identification and quantitative precipitation estimation. Especially, for urban rainfall, which is known for its complicated mechanism and high spatial variability, cloud microphysics process is vital. However, most RSD characteristics analysis focus on differences on sites separated by large distances, less attention is paid on small urban area with great complexity and variability. In this study, RSD characteristics in the Beijing "7.16" strong storm, which accounts for one-sixth of the average annual rainfall of Beijing, is studied by using the distrometer data of two sites over different urban land uses, i.e. roof in dense building area and grass along a river. The two sites are within limited distance, and the data is of 1 minute resolution. Comparison of the RSD characteristics of the two sites shows a slight difference, with a higher concentration of middle rain drops as well as a higher intensity of rain fall on grass than on roof. While, comparison of the RSD characteristics of different rain rate classes show that the highest rain drop concentration happens on roof when the rain rate is less than 1mm/h, and on grass it occurs when rain rate is greater than 1mm/h. These results give insight information about precipitation spatial variability in complicated urban area.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.A31H2928Y
- Keywords:
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- 3310 Clouds and cloud feedbacks;
- ATMOSPHERIC PROCESSESDE: 3360 Remote sensing;
- ATMOSPHERIC PROCESSESDE: 1821 Floods;
- HYDROLOGYDE: 1853 Precipitation-radar;
- HYDROLOGY