Improvement of the Radar Rainfall Accuracy of Xrain by Modifying of Rainfall Attenuation Correction and Compositing Radar Rainfall

Tsuchiya, Shuichi; Kawasaki, Masaki; Godo, Hitomi

doi:10.2208/jscejhe.71.i_457

Cited by 17 publications

(8 citation statements)

References 2 publications

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“…The XRAIN rainfall rate was used as the input for the rainfall-rate nowcast model. Although the accuracy of XRAIN has been assessed by numerous previous studies, such as Tsuchiya et al (2015) and Kim and Maki (2012), strictly speaking, the rainfall observed by XRAIN was not equal to the rain gauge observations because the targets were observed at different heights in each case. Our results focus on the difference between radar observations and predictions, whereas ground truth verification is not considered because CASE1 and CASE2 were too small to be accurately detected by AMeDAS.…”

Section: Resultsmentioning

confidence: 97%

“…Then, the rainfall intensities from all radars belonging to the same intensive observation area are interpolated onto a horizontal grid with a grid spacing of 11.25″ in longitude and 7.5″ in latitude (a spatial resolution of approximately 250 m). All polar coordinate grid points under 5,000 m were taken into consideration using the weighted Cressman interpolation method when generating the XRAIN composite rainfall map (Tsuchiya et al 2015). The data were provided by the National Institute for Land and Infrastructure Manage-ment (NILIM).…”

Section: Two-and Three-dimensional Radar Datamentioning

confidence: 99%

See 1 more Smart Citation

Imminent Nowcasting for Severe Rainfall Using Vertically Integrated Liquid Water Content Derived from X-Band Polarimetric Radar

Hirano

Maki

2018

Journal of the Meteorological Society of Japan

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Section: Resultsmentioning

confidence: 97%

Section: Two-and Three-dimensional Radar Datamentioning

confidence: 99%

Imminent Nowcasting for Severe Rainfall Using Vertically Integrated Liquid Water Content Derived from X-Band Polarimetric Radar

Hirano

Maki

2018

Journal of the Meteorological Society of Japan

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“…The XRAIN product of rainfall intensity is provided every minute with a horizontal resolution of approximately 250 m estimated from the radar reflectivity and specific differential phase shift, KDP as described in Maesaka et al (2011). The accuracy of the XRAIN rainfall was verified by comparison with surface observations (Tsuchiya et al 2015). Japan Meteorological Agency mesoscale analysis data (JMA-MA, JMA 2013) were also used to examine the environmental situation.…”

Section: Observation Data and Processingmentioning

confidence: 99%

Structure and Evolution of Precipitation Cores in an Isolated Convective Storm Observed by Phased Array Weather Radar

Moroda

Tsuboki

Satoh

et al. 2021

Journal of the Meteorological Society of Japan

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A phased array weather radar (PAWR) can complete one volume scan in seconds, thus enabling us to obtain high spatiotemporal resolution echo intensities and wind fields of storms. Using its rapid scanning capability, we investigated the evolution of a convective storm in detail. To describe evolution of convective storms, we used the following definitions. The precipitation cell is defined as a three-dimensionally contiguous region of 40 dBZ or greater. The precipitation core is defined by a threshold of positive deviation greater than 7 dBZ, which is a difference from the average reflectivity during the mature stage of the cell. An updraft core is defined as an updraft region of 1 m s −1 or stronger at a height of 2 km. An isolated convective storm was observed by two PAWRs on 7 August 2015 in the Kinki District, western Japan. The storm was judged as a single cell, according to the above definition. We identified nine precipitation cores and five updraft cores within 49 minutes in the mature stage of the cell. A long-lasting updraft core and its branches moved southwestward or southeastward. Around these updraft cores, the precipitation cores were generated successively. The updraft core with the longest duration lasted 73.5 minutes; in contrast, the lifetimes of precipitation cores were from 4.5 to 14.5 minutes. The precipitation cell was maintained by the successive generations of updraft cores which lifted humid air associated with a low-level southwesterly inflow. The total amounts of water vapor inflow supplied by all the identified updraft cores were proportional to the volumes of the precipitation cell, with a correlation coefficient of 0.75. Thus, the extremely high spatiotemporal resolution of the PAWR observations provides us with new evidence that an isolated convective storm can be formed by multiple precipitation cores and updraft cores.

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“…As for cumulative rainfall volume, although there exists around 20% gap at Kugayama Bridge, they reproduce almost the precise volume. The precision of total rainfall volume is evaluated by the total rainfall ratio (total volume of X-band MP radar data divided by that of ground observation data), which has also been used in existing studies [3] as primary index. Around 10 to 20% gap in the total rainfall ratio is considered acceptable in existing studies.…”

Section: Target Basin and Rainfallmentioning

confidence: 99%

“…The system provides detailed spatial and temporal distribution of rainfall data. The accuracy of X-band MP radar rainfall has been improved through recent studies on the characteristics of observation and precise estimation method of radar rainfall [3][4][5]. Existing studies utilizing the X-band MP radar rainfall with high resolution include: the verification of the preciseness of rainfall or snowfall estimation by ground observation rainfall data [6], comparison of radar data and ground observation rainfall through range analysis in Nagoya region [7], and verification of estimated rainfall volume and spatial accuracy for rainfall events of low temporal resolution [8].…”

Section: Introductionmentioning

confidence: 99%

Study on the precision of 1-minute X-Band MP radar rainfall data in a small urban watershed

Yonese¹,

Kawamura²,

Amaguchi³

et al. 2018

Int. J. SDP

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In Tokyo metropolitan area, the flood risk is increasing due to social and environmental conditions including concentration of population and industry etc. In small urban watersheds, there exists a high risk of inundation by river flooding and/or inner water induced by heavy rainfall in a short time. To estimate river water level accurately in urban small rivers, it is critically important to obtain accurate rainfall data with high resolution of spatio-temporal distribution. X-band MP radar (X-band multiparameter radar), providing high resolution of spatio-temporal distribution rainfall data, is expected to be made effective use of its advanced detailed data. However, few studies on the precision evaluation of 1-minute X-band MP radar data were performed. In this study, a precision evaluation of X-band MP radar data was conducted by comparing radar data to 1-minute ground observation data, which is densely deployed in Tokyo Metropolitan area, provided by Tokyo Integrated Information System on Water Disaster Management. In this study, 10 heavy rainfall events in 2013 were selected as target events in the upper Kanda River, one of the typical urban small rivers in Tokyo. As for rainfall intensity, 1-minute data of X-band MP radar expressed a better peak accuracy compared with 10-minute data. The peak values of 10-minute data were underestimated about 30% in some event. One-minute data of X-band MP radar were observed a few minutes earlier than ground observation data. The falling time of rain drops is considered as the major factor of the difference. This study showed that it is possible to obtain detailed rainfall characteristics such as precise rainfall intensity and its time of occurrence by utilizing 1-minute X-band MP radar rainfall, which are not sufficiently provided by 10-minute data and its extended resolution is anticipated to be practically useful in smaller urban watersheds.

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Improvement of the Radar Rainfall Accuracy of Xrain by Modifying of Rainfall Attenuation Correction and Compositing Radar Rainfall

Cited by 17 publications

References 2 publications

Imminent Nowcasting for Severe Rainfall Using Vertically Integrated Liquid Water Content Derived from X-Band Polarimetric Radar

Imminent Nowcasting for Severe Rainfall Using Vertically Integrated Liquid Water Content Derived from X-Band Polarimetric Radar

Structure and Evolution of Precipitation Cores in an Isolated Convective Storm Observed by Phased Array Weather Radar

Study on the precision of 1-minute X-Band MP radar rainfall data in a small urban watershed

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