Meteorological services for flood disaster mitigation in Northeast China

11-09-2013 Source:China Meteorological News Press

Since this flood season, because of the location of western pacific subtropical high is westing and northing which bring abundant water, as well as active cold air, Northeast China including Jilin Province, Heilongjiang Province, parts of Inner Mongolia got severe precipitation. In some of these areas, the daily precipitation or total rainfall has broken the historical records. During the whole August, the continuous rainfall has caused the largest basin floods in Songhua River basin since 1998. Meanwhile, Heilongjiang also has gotten the largest floods since 1984 while the floods of Hunhe river and Kouhe river in Liaoning broke history records.

 

The picture shows the floods in Tongjiang river areas of Heilongjiang on Aug.26.

 

On Aug.14-17, the total precipitation of northern Liaoning and southern Jilin exceeded 200-366mm. In Heishan County and Qingyuan County of Liaoning, the daily rainfall was 262mm and 245mm which break the historical records. The total precipitation of 253 meteorological stations surpassed 100mm in Jilin Province. Influenced by severe rainstorm, the water body of Nen River, the Songhua River and Heilongjiang River has exceeded the warning water level at the same time. According to the statistical data, from May 1 to Aug.24, the precipitation of Heilongjiang River basin, Nenjiang River basin and main stream of Songhua River has been up to the first, the second and the third place respectively in history records. Persistent heavy rain caused vast floods in Northeast China.

Precipitation forecast for Songhua river basin and Nenjiang river basin in next ten days from Aug.11. (Dark blue—50-100mm, Purple—100-200mm, Red—200-260mm )

 

To deal with the Northeast China floods, Chinese leaders have given a few requirements. The State Flood Control and Drought Relief Headquarters initiated level Ⅱ emergency response; CMA initiated level IV emergency response and Heilongjiang, Liaoning and Jilin meteorological bureaus also released emergency response as soon as possible.

 

In Fuyuan County of Heilongjiang, the meteorological worker braved the threat of floods to observe data.

 

From Aug.17, CMA began to make special reports of meteorological service and hold several intensive weather consultation meetings for the heavy rain forecast of Songhuajiang River. Meanwhile, Liaoning, Heilongjiang and Jilin meteorological bureaus have provided tailored services. They issued continuous warning information by various ways and made special reports for highway, railway, and oil fields. 

 

During this period, the meteorological departments utilized various high-tech methods to monitor the floods and provide better services for Northeast China, such as satellite remote sensing, the Fengyun meteorological satellites, the International Charter and German radar satellites, etc.

 

FY-2E meteorological satellite TBB images at 18:00, 20:00, 22:00 of Aug.15, and 00:00 of Aug 16.

 

Influenced by upper-air trough, central Inner Mongolia, Northeast China, and northern North China saw rainfall on the end of August. The front of the upper-air trough continually generated strong convective clouds. Influenced by such strong convective clouds, eastern Jilin, central Liaoning, and northern Hebei saw rainstorm or heavy rainstorm. 

 

The meteorological satellite monitoring image for Songhua River and Nen River on 10:46 of Aug.16. 

 

According the Natonal Satellite Meteorological Centre's monitoring, the water body of main stream of Nen River was wider than last year obviously on Aug.19. Meanwhile, there were new added water body in Qiqihar City, Zhaoyuan County, Tailai County and other areas.  

 

TerraSAR-X radar satellite monitor the water body of lower reaches of Nenjiang River on 17:48 of Aug.17.

 

The satellite remote sensing image on the lower reaches of Nen River. In this picture, red shows the expanded water regions, blue meant unchanged water regions.(Aug.17 of 2013 VS Aug.17 of 2012)

 

To better observe floods in Northeast China, the National Satellite Meteorological Center of CMA turned to the International Charter to get data and monitoring images of lower reaches of Nen River. The data and images show the water body of lower reaches of Nen River in this year is wider than last year. There are new expanded water regions in Zhenlai County of Jilin Province, Zhaoyuan County and Dorbed Mongolian County of Heilongjiang Province. It's estimated that the width of lower reaches of Nen River is about 2 kilometers, about 1.7 kilometers wider than last year. In this picture, new expanded water regions in this year are about 1000 square kilometer more than last year. 

 

Meteorological satellite monitors the change of water body(Aug.20 vs Aug. 16). Blue shows unchanged water body, red indicates expanded water body, yellow shows reduction and white means cloud.

 

The International Charter aims at providing a unified system of space data acquisition and delivery to those affected by natural or man-made disasters through Authorized Users. Each member agency has committed resources to support the provisions of the Charter and thus is helping to mitigate the effects of disasters on human life and property.  The International Charter was declared formally operational on November 2000.

 

Generally speaking, the meteorological departments are continuous to enhance the monitoring and analysis for weather change to supply more scientific supports for floods prevention and disaster mitigation.(Sep.11)

 

Editor: Hao Jing





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