Upload
others
View
6
Download
0
Embed Size (px)
Citation preview
New River Information Systemand
Radar Rain Gauge Network in Japan
11 May 2005 at Hanoi
Dr. NAKAO, TadahikoFRICS, Japan
Information indispensable for Flood Fighting and Evacuation
© MLIT
Inundation of ToyookaCity, 21 October 2004
New Integrated River Information System
Regional Dev. Bureaus
Regional Bureaus
Prefectures
Municipalities Private EnterprisesMass Media PrefecturesRegional Bureaus
Radar Rain Gauges
Telemeter Stations
Japan Water Agency
JWA
Sharing of Information
PublicJMA
Meteorological Agency
Sources of Data
28,550 128 267 7,513 1,321 976 18,345 Total
12,809 12,809 Average Rainfall (Radar)
967 6 156 805 Average Rainfall (Telemeter)
14,774 128 261 7,357 1,321 976 4,731 Subtotal
1,270 46 100 190 934 Others
5,088 13 67 3,248 1,760 Water Stage
8,390 69 94 3,919 1,321 976 2,011 TM Rain Gauges
26 26 Radar Rain Gauges
TotalOthersJWALocal Gov’tJMAHighway
BureauRiver Bureau
As of 01 March 2005
5 Points of the New System
• National system integrating local systems• Single system integrating telemeter & radar• Single display viewing data from variety of
sources• Single user terminal for both flood and non-flood
tasks in an ordinary office environment• Coherent information to be shared among river
administrators, related organizations, municipalities, and the public
Integration of Telemeter & Radar
Radar Terminal Telemeter Terminal
On-line Calibration&
Real time Validation
Unified Terminal
Single Display for different SourcesRiver Dept. Local Governments
JMA, etc.
River Data Terminal
Data from Local Governments
JMA, etc.Unified Terminal
Integration Procedure• River Information Systems in Japan have been
developed for individual river basins. Minor difference in the application of general rules poses difficulty for integration.
• Integration of data obtained from other agencies than river administration also demands careful handling.
• Establishment and maintenance of a “metadata”database should be paid special attention.
• In solving above problems, eXtensible Markup Language (XML) has shown its effectiveness.
Binary transmission currently used
0 0 0 10 0 1 40 4 f 2e 8 2 00 0 0 05 3 0 b0 0 0 10 0 0 0 0 0 0 00 0 0 00 0 0 0 0 0 0 1
バイナリ形式
0 0 0 10 0 1 40 4 f 2e 8 2 00 0 0 05 3 0 b0 0 0 10 0 0 0 0 0 0 00 0 0 00 0 0 0 0 0 0 1
バイナリ形式
• Kind of data• Calculated/Observed• RiverAreaNumber• (Reserved)• ControlOfficeNumber• StationNumber• (Reserved)• Flag1, Flag2• Flag3, Flag4• Data
Transmission of Data using XML
• More number of bits than binary transmission, but
• More readable therefore more convenient for system maintenance
• Taking advantage of high speed transmission network and computer power
* Data indicated by arrows are provided from (meta)database(s).
*
*
*
Some Views of the New System (1)
View of the New System (2)
Radar Rain Gage
Takasuzuyama Radar, August 1998
雨量強度(mm/h)
Masked AreaMasked AreaDifference between RadarsDifference between Radars
Synthesizing without Calibration
Opposition to the Radar Rain Gauge System
• Seams between radars show that radars will give us a false information.
• A Good moving picture is available, but it is not suitable for further usages.
• A ground rainfall gauge gives the real and reliable data.
• Against these prejudices, FRICS developed an online synthesis system incorporating real-time calibration.
Radar Image Synthesizing Map
MLIT’s 26 radars are synthsized based on accuracy of each radar.
美土里奥津
倉床
郡家
徳島
古高松大崎町役場
久比
東之川
寺川
御三戸
佐敷
Accuracy of the Radar Rainfall System (1)
Evaluation through comparison with ground raingages
雨量時系列(高知工事:佐敷)
0
10
20
30
40
50
60
70
13 14 15 16 17 18 19 20 21 22 23 0 1 2 3 4 5 6 7 8 9 10 11 12
2000年11月1日~2日
雨量(mm/h)
地上雨量 レーダ雨量 レーダ(DWのみ) レーダ(均質化補正・DW)
雨量時系列(気象庁:徳島)
0
5
10
15
20
25
30
7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 0 1 2 3 4 5 6
2000年9月11日~12日
雨量(mm/h)
地上雨量 レーダ雨量 レーダ(DWのみ) レーダ(均質化補正・DW)
Ground
Radar (raw)
Radar (processed)
Sashiki Station
Tokushima Station
ComparisonGround & Radar
◎高蔵寺(国)
◎名古屋北(国)◎瀬戸(国)
◎三国山(国)
◎妻木(国)
◎瑞浪(国)
◎山岡(国)
◎論栃(国)
◎日吉(国)
◎恵那(気)
◎春日井(国)
◎多治見(気)
◎名古屋(気)
◎多治見(国)
八田川流域春日井地点
△
雨域の移動方向
YStream(20Km2)
Main River
For a Small Tributary without Raingage
Accuracy of Radar evaluated through Runoff (2)
Runoff Calculated from neighboring Ground Gages: Poor Result
0
100
200
300
400
500
600
0 3 6 9 12 15 18 21 0 3 6 9 12 15 18 21 0
(m3/s)0
10
20
30
40
50
60
(mm/10min)
計算流量
実測流量
11日 12日 時
雨 量
流 量
Calculated Discharge
Observed Discharge
0
100
200
300
400
500
600
0 3 6 9 12 15 18 21 0 3 6 9 12 15 18 21 0
(m3/s)0
10
20
30
40
50
60
(mm/10min)
計算流量
実測流量
時12日11日
Runoff Calculated from Radar Rain Gauge:Peaks were Simulated Well.
雨
量
流
量
Calculated Discharge
Observed Discharge
Radar Information is Reliable!
• Since the first installation of a radar raingage on the Mt. Akagi, doubts have been raised: Does it give quantitative information, and is it reliable?
• FRICS answers positively to this question.Yes, radar system will prvide quatitative and reliable information vital for river administration.
• However, due consideration should be paid to get optimum results. Thorough tuning and calibration is essential to make best use of the system.
Thank you for listening.
mailto: [email protected]
http://www.river.go.jp/http://i.river.go.jp/
Radar Images: