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APPLICATION OF RADAR REMOTE SENSING IN FLOOD MANAGEMENT
BY:RAHUL BAJPAI
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
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
•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
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
AwarenessSub-Systems
Risk Assessments
Satellite data
ForecastingSub-Systems
Rainfall Prediction
WarningSub-Systems
Secure Communications
Broadcast Media
ActionSub-Systems
Evacuation
Insurance Flash 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)
WHY?LIDAR RADAR
TypesDEM : Digital Elevation ModelDSM : Digital Surface Model
Elevation Data
SourcesUSGS DEM, NED, DTED, ETOPO30, SRTMInterpolated from points and linesGenerated photogrammetricallyLiDAR
DEM
FLOW DIRECTION
SINK
FILL
FLOWLENGTH
FLOW ACCUMULATION
WATERSHED
SNAP POUR
Depression lessDEMAre there any sinks?
No
Yes
STREAM LINE
STREAM ORDER
STREAM LINKApp
ly T
hres
hold
Function Processing
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
SRTM DATA DERIVED DEM
COLOR PHOTOGRPH RADAR IMAGE
FLOOD MAP
•Several studies indicated that SAR can be used to delineate flood boundaries even when they are obscured by forest or other vegetation,
THANK YOU