multi-hazard risk assessment, mapping and land use

8/3/2019 Multi-Hazard Risk Assessment, Mapping and Land Use

http://slidepdf.com/reader/full/multi-hazard-risk-assessment-mapping-and-land-use 1/13

MULTI-HAZARD RISK ASSESSMENT, MAPPING

AND LAND USE PLANNING

PROMOTION OF ENERGY EFFICIENT

COOKING, HEAT AND HOUSING TECHNOLOGY (PEACH)

N a s i r u d d i n GI S an al y s t -WWF -P ak i s t an



GOAL

land use mapping for four selected villages of Gilgit-Baltistan and Chitral, Pakistan

Objectives

Literature reviewField survey of study areaProcurement of High Res. ImagesImage enhancement and digitize

topographic layersQuantification of riskMulti-Hazard Risk Assessment mappingLand use mapping

N a s i r u d d i n GI S an al y s t -WWF -P a

k i s t an



MULTI-HAZARD RISK ASSESSMENT (MHRA)

When an area exposed to more than one hazard it is called multi-hazard

NATURAL PHENOMENA WHICH MAY BEHAZARDOUS

HydrologicFlood

Erosion Geologic

Land sliding

Avalanches

SeismicFault ruptures

Epicenter

Ground shaking


k i s t an



Earthquake Land sliding River floods

Location

EpicenterType of Fault linesSeismic ZoneGeologic formations

InventoriesSlopeGeologic formationsPathType

ChannelFlood wayFlood PlainElevation

Severity

IntensityMagnitudeAccelerationDisplacement

VelocityDisplacement

VolumeVelocityRate of RaiseSlope

Likelihoodof

occurrence

Recurrence intervalHistorical seismicity

EarthquakerecurrenceRainfall patternBank cutting rate

Historical returnperiodFlood recordDesign event

Information Need to Multi-Hazard Study Area


k i s t an



METHODOLOGY Equipment

Questioner

Historical data collection

Extract information form satellite data and existing data set

GPS survey

Geological survey

Spatial analysis

Hydrological analysis

Risk probability

Develop layer

Overlaying Hazard Risk Map at Village level

Land use Mapping


k i s t an



QUESTIONER

Open and Close ended Question format will be designed relatedto study area that will be entertain during filed work

Historical data collectionAccesses disaster management department and management

agencies (NDMA, GSP)

By contact local people

Visual Interpretation

Equipment

GPSCompass

Range Finder N a s i r u d d i n GI S an al y s t -WWF -P a

k i s t an



GPS surveyIdentify risky areas i.e. landsilding, faults, floodand note their location

Extract flood plain extent

ElevationFlood ways

Element at risk

Geological survey

Identification of riskier fault line Calculation of Strike angle and dip angleRock structure classificationPhysical interpretation and identification of riskyareas on the base of slop, nature of material, andorientationPredict the hazard direction with volume and defineits velocity

Extract information

Extract landmark and linear features with area extent i.e.Settlement, roads network , facilities , flood plans, channel,

Boundary extent, vegetation and study area extent




HYDROLOGICAL ANALYSIS Extract Dem using rig line

Delineate water shad form DEM

Delineate catchment area from water shad Calculate flow direction on the base of slop

Spatial analysis

Generate specific interval of contour

Classification of slope

Reclassification of Image data

Risk probability

Calculate numerical risk probability on the base of historical

data by dividing total event with annual number of days thatfall in interval of ‘0’ to ‘1’ and express it in percentage




Develop layer

Define datum and projection system

Cerate Layer (Point, Line. Polygon)

Enter attribute data and update all layers

Symbol Earthquake Flood Landslide

Point Epicenter site Flood site Land slide site

Line Faults Flood route,Elevation

Direction of sliding

Polygon Seismic intensityarea

Flood prone area Landslide pronearea




Overlaying

Overlay the set of layer

Classification of data

Apply cartographic techniques

High light Risky areas

Quantification of risk areas

Level Earthquake Landslide Flood plainAssignValue

High

Seismic zoneActive Fault

Ground shakingNature ofgeologicalmaterial

Type oflandslideLocationLikelihoodNature ofmaterialSlopeVelocityRainfall

Area extentDepthVolumeBank erosionrateTime intervalRaising ofdebrisRainfall

1

Moderate 2

low 3

HAZARD RISK Mapping N a s i r u d d i n GI S an al y s t -WWF -P ak i s t an



HAZARD RISK MAP




Land Use Planning

Divide the study area in to zones level

Determine risk level on base of slope, probability of likelihood

event in history, Flood plan extent and depth, land slidingvolume and their vulnerability, terrain model , bank erosion rate,ground shake value and faults pass though an area anddistance form epicenter

For Zone 1:It can be allowed to be usedfor: – Big buildings –

Big factories – Residential areas – Agricultural activities

For Zone 2:It can be allowed to be used for: – Agricultural activities like: rice plantation,

bean plantation, corn plantation, etc.

For Zone 3:In Zone 4 very limited activities can beallowed like: – Fishing activities –

Pumping water for irrigation purposes




Thank N a s i r u d d i n GI S an al y s t -WWF -P ak i s t an

multi-hazard risk assessment, mapping and land use

Documents