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Indian Journal of Radio & Space Physics (IJRSP) >
IJRSP Vol.41 [2012] >
IJRSP Vol.41(4) [August 2012] >
| Title: | Developing a composite rainfall map based on observations from an X-band polarimetric radar network and conventional C-band radar |
| Authors: | Maki, M
Maesaka, T
Kato, A
Kim, D S
Iwanami, K |
| Keywords: | Composite rainfall map
Polarimetric radar
Quantitative precipitation estimates (QPE)
Rainfall attenuation
Signal extinction area |
| Issue Date: | Aug-2012 |
| Publisher: | NISCAIR-CSIR, India |
| PACS No.: | 92.60.jf; 84.40.Xb |
| Abstract: | This paper
aims to demonstrate the benefits of using X-band polarimetric radar networks
for hydrological monitoring. A method of deriving composite rainfall maps is
presented based on data from a combination of an X-band polarimetric radar network (X-NET) and supplementary conventional
C-band radar, the latter used to extend the observation area. This approach was
applied to a heavy rainfall event observed on 7 October 2009 associated with
typhoon T0918 (located south of Japan). It was found that a signal extinction
area developed behind the band of heavy rainfall, where the scattered signal
was below the receiver’s noise level. Three networked X-band radars were able
to fill in the signal extinction area, but the blanking azimuthal area of one
of X-band radars remained. The use of C-band operational radar provides an
alternative and effective approach to filling in the signal extinction area and
extending the coverage area when the number of X-band polarimetric radars
available is limited. Validation of the composite radar rainfall map using
surface rain gauge data showed a good correlation between the two data sources,
although the radar tends to underestimate rainfall amounts by around 20%
compared with the rain gauges. |
| Page(s): | 461-470 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-105X (Online); 0367-8393 (Print) |
| Source: | IJRSP Vol.41(4) [August 2012]
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