Progress of Flood Monitoring & Assessment by Remote Sensing in - - PowerPoint PPT Presentation

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Progress of Flood Monitoring & Assessment by Remote Sensing in - - PowerPoint PPT Presentation

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Progress of Flood Monitoring & Assessment by Remote Sensing in China China Institute of Water Resources &Hydropower Research(IWHR) Li Jiren 2019.6 TOPICS 1. Flood monitoring 2. Disaster assessment 3. Monitoring on water project for

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Progress of Flood Monitoring & Assessment by Remote Sensing in China

China Institute of Water Resources &Hydropower Research(IWHR) Li Jiren

2019.6

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TOPICS

  • 1. Flood monitoring
  • 2. Disaster assessment
  • 3. Monitoring on water project for flood control
  • 4. Flood forecasting and risk map
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China is suffered from flood disaster for a long history. So Chinese government pays more attention to flood control. Remote sensing technology has been used for flood monitoring since1980, then disaster assessment, water project monitoring, risk map making, and establishment1of professional system were made step by step.

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1.Flood monitoring

Image Data Sources

1.Space satellite：Landsat 8,SPOT, Radarsat 2, Envisat、 Sentinel-1 GF-1, GF-2, GF-3, GF-4, GF-5, GF-6, ZY3-01, ZY3-02, ZY1-02C ZY-04, BJ-2, JL-1 2.Air-born SAR 10,000~13,000m（all weather） helicopter, unmanned plan Real-time monitoring mainly depends on radar image Background data from visible image

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Appropriatness evaluation for remote sensing data usually used

Data Landsat 8 SPOT NOAA/ AVHRR GF-3 (domestic) EOS/ MODIS Sentinel-1 Air- born SAR Unmanned plan Revisit（d） 16 26 0.5 29 0.5 12 anytime anytime All weather × × √ √√ × √√ × × Data obtain × × √ √ √√ √ √√ √√ Inundation extent √√ √√ √√ √√ √√ √√ √√ √√ Water depth √ √ × √ × √ √ √ Duration × × √ — √ — — √√ Background data √√ √√ × √ × √ × × Water works monitoring × × × × × × √√ √√ Disaster assessment √ √ √ √ √ √ √ √ NOTE: √√very suitable √general suitable ×not suitable

1.Flood monitoring

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航空卫星通信系统

Real-time transmission system of air-born SAR

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Inundated oil-well at Daqing in 1998 by this system

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Factors for monitoring:

Extent of inundation Duration of inundation(successive monitoring) Water depth and its spacial distribution with the aid of DEM

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Flood monitoring & assessment system (software)

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系统总界面 雷达影像水体自动提取界面 淹没范围提取界面

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Dynamic Monitoring for Monwa Detention Basin

2003.7.5 17:22 2003.7.7 6:11 2003.7.12 18:18

Water level：28.82m

蒙 洼

王家坝 水位：28. 23m

蒙 洼

王家坝 水位：28. 69m

蒙 洼

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上六方堤 下六方堤 石姚段

荆 山

瑚 洛河洼 2003年7月12日18时18分 2003年7月7日6时11分 上六方堤 下六方堤 石姚段

荆 山

瑚 洛河洼

Dynamic Monitoring for Jinshanhu Flooding Basin

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2003年7月7日6时11分 2003年7月12日18时18分

城西湖 塘垛湖 邱 城 东 湖 家 湖 城西湖 塘垛湖 邱 城 东 湖 家 湖

Dynamic Monitoring for the Chendonghu Detention Basin

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Heilong River in August,2013

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Wuhan City in 2016

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。

Hubei and Anhui in 2016

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14 times monitoring for downstream of Yangtze River in 2016

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Shouguang, Shangdong in 2018

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Dammed lake of the Jinsha River in 2017 & 2018

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TOPICS

  • 1. Flood monitoring
  • 2. Disaster assessment
  • 3. Security of Water Project for flood control
  • 4. Flood forecasting and risk map
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Flood characteristics unit Social & economy unit Calculation unit

Depending on water depth, duration and inundated objects from social & economic data base, the most difficult factor is loss rate.

  • 2. Disaster assessment

LOSS

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Disaster loss evaluation model

Economic loss estimation is performed on the basis

  • f grid which is common for flood routing and

social-economic database. On the basis of water depth, inundation duration, inundation object and corresponding loss rate, the capital loss is calculated.

N j jn i j k m n jkm ij

e Y A Rcapital ) 1 (    

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According to the inundation duration, the loss due to stoppage of business is calculated.

365 / ) 1 ( Days e B L R

N j i j ij j busi

  

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

 

i j j ijdirect indirect

K R R

N j historical relief

e R R ) 1 (  

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 

 

i T bt i benifit

dt ae U R

benifit relief indirect busi capital total

R R R R R W     

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0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0m~0.5m 0.5m~1.5m 1.5m~2.5m 2.5m~3.5 大于3.5m

水深 损失率 农业部门 工厂企业 建筑业 货运仓储业 商业

Relation curve between loss rate and water depth for different sector

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0.1 0.2 0.3 0.4 0.5 0.6 0.7 1天 1~2天 3~4天 5~6天 7天以上 淹没时间 损失率 水稻 小麦 玉米 蔬菜

Relation curve between loss rate and inundation duration for different crops

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TOPICS

  • 1. Flood monitoring
  • 2. Disaster assessment
  • 3. Monitoring on water project for flood control
  • 4. Flood forecasting and risk map
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Variation of river regime

Variation of river regime due to scour and filling of sedimentation, also sand dredging may cause the change of flow direction, and threat the security of dyke.

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雅江出境处—— 冲刷为主

布河卡齐兰加国家公园段——冲淤基本平衡

布河流向拐点处——冲刷为主 布河与恒河汇流处——冲淤基本平衡 入海口——淤积为主

Variation of river course

River course variation of the Yalouzhanbu River from 1980 to 2013

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Monitoring of river regulation

2008年12月30日 。

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Monitoring of river regulation

2007年5月6日 2013年3月26日

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Monitoring on water project for flood control

B B R  R R   A H ' A r  M S

Displacement and transformation of dam by INSAR Three Gorge Dam

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Monitoring on water project for flood control

Stability of dam

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Monitoring on water project for flood control Revise of relation curve between Water level and Storage of reservoir by means of remote sensing images

20 40 60 80 100 120 140 160 70 80 90 100 110 120 130 140 水库库容 (亿m3) 水位(m)

Shuifeng Reservoir（80m～131m）

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TOPICS

  • 1. Flood monitoring
  • 2. Disaster assessment
  • 3. Monitoring on water project for flood control
  • 4. Flood forecasting and risk map
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Flood forecasting and risk map

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1) Input of flood forecasting system, including precipitation, initial soil moisture content. Doppler radar, TRMM, GPM, GPS-RS

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Flood forecasting and risk map 2)Parameter determination according to underlying conditions from remote sensing. 3)Watershed hydrological model on the basis of both water balance and energy balance, which is significant for ungagged basin.

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Risk maps reveal the flood risk degree and distribution characteristics under different flood scenarios in key flood control areas of China. Risk map which has been made covers 496000 km2, being occupied 48% of the risk region of whole country. All basic data needed for making risk map are from remote sensing.

48%

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198 rivers with the total length of 2700 km、 45 important cities 78 Detention basins with the total area of 29000 km2 26 flood plains with the total area of 8800 km2 227 important area for flood detention with the total area of 408100 km2

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Thanks for Attention

lijiren@iwhr.com