application of radar remote sensing in flood management

1. APPLICATION OF RADAR REMOTE SENSING
IN FLOOD MANAGEMENT
BY:RAHUL BAJPAI

2. TOPICS
•INTRODUCTION TO RADAR REMOTE SENSING
•INTRODUCTION TO FLOOD MANAGEMENT
•USE OF RADAR IN FLOOD MANAGEMENT
•INTEGRATION OF GROUND BASED AND
SATELLITE RADAR DATA
•DIGITAL ELEVATION MODEL
•FLOOD MANAGEMENT MAP

3. RADAR REMOTE SENSING
RADAR stands for "Radio Detection And Ranging". By virtue of sending out
pulses of microwave electromagnetic radiation this type of instrument can be
classified as an "active sensor" - it measures the time between pulses and their
reflected components to determine distance.
radar only shows the difference in the surface roughness and
geometry and moisture content of the ground (the complex dielectric constant).
Radar and infrared sensors are complimentary instruments and are often used
together to study the same types of earth surfaces.
Radar systems may or may not produce images

4. •Near real time flood monitoring
•To assess the nature of floods e.g. magnitude, type,
recurrence intervals, etc
•Mapping of flood prone areas
•Assessment of risk to the bio-physical, socio-economic and service
,infrastructural elements
•Assessment of vulnerability and disaster
Though floods cannot be stopped ,its damages can be minimized by proper
management measures. Flood disaster management demands efficient planning
measures, implementation and policy making decisions , application of modern
scientific and communications tools for smooth functioning
FLOOD MANAGEMENT

5. The Flood Forecasting involves the following four main activities :-
(i) Observation and collection of hydrological and hydro-meteorological data
(ii) Transmission of Data to Forecasting Centres
(iii) Analysis of data and formulation of forecast
iv) Dissemination of forecast.
FLOOD FORECASTING SYSTEM
Awareness
Sub-Systems
Risk Assessments
Satellite data
Forecasting
Sub-Systems
Rainfall Prediction
Warning
Sub-Systems
Secure
Communications
Broadcast Media
Action
Sub-Systems
Evacuation
InsuranceFlash Flood
Prediction
Person-to-person
Emergency
Reinforcement
IT Infrastructure
Debris Flow
Prediction etc
Ground based
radar system
Resettlement
etc
(see Chapter 6) (see Chapter 7)

7. WHY?LIDAR RADAR

8. Types
DEM : Digital Elevation Model
DSM : Digital Surface Model
Elevation Data
Sources
USGS DEM, NED, DTED, ETOPO30,
SRTM
Interpolated from points and lines
Generated photogrammetrically
LiDAR

9. DEM
FLOW DIRECTION
SINK
FILL
FLOWLENGTH
FLOW ACCUMULATION
WATERSHED
SNAP POUR
Depression less
DEM
Are there any sinks?
No
Yes
STREAM LINE
STREAM ORDER
STREAM LINK
ApplyThreshold
Function Processing

10. Determine aspects of terrain
Slope, aspect, spot elevations
Source for contour lines
Finding terrain features
Watersheds, drainage networks, stream channels
Modeling of hydrologic functions
Uses of DEMs
Slope
Watersheds
Mean Slope per Watershed

11. SRTM DATA DERIVED DEM

12. COLOR PHOTOGRPH RADAR IMAGE

13. FLOOD MAP
•Several studies indicated that
SAR can be used to delineate
flood boundaries even when
they are obscured by forest or
other vegetation,

14. THANK YOU