flood mapping menaxhimi i rezikut te permbytjeve objektivat gjenerale
TRANSCRIPT
![Page 1: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/1.jpg)
FLOOD MAPPING
Menaxhimi i rezikut te permbytjeve
Objektivat Gjenerale
![Page 2: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/2.jpg)
General Objectives
1. Protect people and goods2. Preserve river capacity and flood plants3. Conserve ecological equilibrium
To reach these objectives, a regulation of land use in the floodplain is necessary:
– Forbidding new construction in high risk areas,
– Controlling urban extension in floodplain,
– Limiting embankment to minimum.
![Page 3: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/3.jpg)
Example of flood risk mapping
• Zone 1 - Little / no risk• Zone 2 - Low to Medium risk (light blue)• Zone 3 - High risk (dark blue)
![Page 4: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/4.jpg)
Principe of flood risk analysis
– Flood hazard assessment: three hydraulic parameters considered
1. Water depth,2. Flow velocity,3. Duration of inundation
![Page 5: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/5.jpg)
Flood risks analysis
Flood hazard classification
Depth Velocity
Low velocity (Plain flood)
Medium velocity
High Velocity(Flash flood)
Depth < 0.5 m Moderate Moderate Moderate to high
0.5m < depth > 1.0m
Moderate High High
Depth >1.0m High High High
![Page 6: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/6.jpg)
Flood risk assessment
Vulnerability classification by distinguishing
urban / non urban areas
Flood risk mapping
Flood plain Urban areas
High flood hazard High risk High risk
Moderate flood hazard
Low risk High risk
Flood hazard + vulnerability,
Vulnerability mapping
![Page 7: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/7.jpg)
EXAMPLE Land use regulation
Nature of time construction
TypeNon
urban Zone
Urban Zone
Moderation hazard
High flood hazard
Habitation, Industries, activities
New X Prescriptions X
Reconstruction X X X
Extension Prescriptions Prescriptions Prescriptions
Modification Prescriptions Prescriptions Prescriptions
Public equipment All kinds Prescriptions Prescriptions Prescriptions
CampingNew X X X
Extension X X X
OthersNew X X X
Extension X Prescriptions X
Modification Prescriptions Prescriptions Prescriptions
![Page 8: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/8.jpg)
Where are we now ?
![Page 9: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/9.jpg)
Methodology
Flood
![Page 10: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/10.jpg)
Flood Hazard / Flood Risk
• Different scales
– Preliminary flood risk assessment• Drini River Basin
– Local flood risk map• Pilot area : Skenderaj
![Page 11: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/11.jpg)
Preliminary flood risk assessment DATA GATHERING AND PROCESSING
• Topographical and hydrological data
– SRTM 90 DEM– Contour lines (10m)– Historic floods etc.
• Problems and accuracy– SRTM DEM : 90m x 90m, dZ~10m – Shifting between different maps
![Page 12: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/12.jpg)
![Page 13: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/13.jpg)
DEM from contour lines
SRTM DEM
![Page 14: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/14.jpg)
Shifting between different maps
![Page 15: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/15.jpg)
![Page 16: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/16.jpg)
![Page 17: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/17.jpg)
![Page 18: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/18.jpg)
![Page 19: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/19.jpg)
What are we going to do ?
![Page 20: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/20.jpg)
Improving preliminary delineation of flood areas
– Send questionnaires for the most sensitive towns
– Process with available satellite imagery
– For sensitive areas assess flood hazard with simplified hydraulic calculations and fields visits
– Georeferencing all data
![Page 21: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/21.jpg)
Remember past flooding events (2004-2008)
![Page 22: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/22.jpg)
Skenderaj flooding zone
![Page 23: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/23.jpg)
![Page 24: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/24.jpg)
![Page 25: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/25.jpg)
![Page 26: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/26.jpg)
![Page 27: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/27.jpg)
![Page 28: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/28.jpg)
Local flood risk map Pilot area: Skenderaj
Work completed:• Field visits • Questionnaire prepared • TOR for topographic survey
Next steps• Hydraulic modelling• Flood risk mapping• Discussing about a pilot flood risk management plan
![Page 29: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/29.jpg)
![Page 30: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/30.jpg)
A quick presentation of
the technology
![Page 31: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/31.jpg)
Floodplain Mapping Approach
Watersurfaceprofiles
ArcGIS
Geometricdata
ParametersSchematic
Flowdischarge
Hydrology Hydraulic model
ArcGIS
HydraulicHydrology
![Page 32: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/32.jpg)
Floodplain Mapping Approach
ArcGISInput Data
DEM
HydrologyFlood
discharge
HydraulicWater
surfaceprofiles
ArcGISFlood
plain maps
Flowdischarge
Geometricdata
ParametersSchematic
ArcGIS
HydraulicHydrology
![Page 33: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/33.jpg)
Hydrology
Hydrology
1000120014001600180020002200240026002800
19-J
un-0
2
19-J
ul-0
2
18-A
ug-0
2
17-S
ep-0
2
17-O
ct-0
2
16-N
ov-0
216
-Dec
-02
15-J
an-0
3
14-F
eb-0
3
16-M
ar-0
3
15-A
pr-0
3
15-M
ay-0
3
14-J
un-0
3
14-J
ul-0
3
13-A
ug-0
3
12-S
ep-0
3
12-O
ct-0
311
-Nov
-03
11-D
ec-0
3
10-J
an-0
4
9-F
eb-0
4
10-M
ar-0
4
9-A
pr-0
4
9-M
ay-0
4
8-Ju
n-04
8-Ju
l-04
7-A
ug-0
4
6-S
ep-0
4
6-O
ct-0
45-
Nov
-04
5-D
ec-0
4
4-Ja
n-05
3-F
eb-0
5
5-M
ar-0
5
4-A
pr-0
5
4-M
ay-0
5
3-Ju
n-05
3-Ju
l-05
2-A
ug-0
5
1-S
ep-0
51-
Oct
-05
31-O
ct-0
5
30-N
ov-0
5
30-D
ec-0
5
29-J
an-0
6
28-F
eb-0
6
30-M
ar-0
6
29-A
pr-0
6
29-M
ay-0
6
28-J
un-0
6
28-J
ul-0
627
-Aug
-06
AM
SR
-E r
adia
nce,
degr
ees
K x
10
0
2000
4000
6000
8000
10000
12000
Est
imat
ed D
isch
arge
(m
3/se
c)
![Page 34: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/34.jpg)
Digital Terrain Model: DTM
ArcGIS
HydraulicHydrology
• Observed points and break lines for constructing
a triangular irregular network (TIN).
![Page 35: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/35.jpg)
•TIN components:- nodes- edges- triangles
Triangular Irregular
Network : TIN
ArcGIS
HydraulicHydrology
DTM -
![Page 36: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/36.jpg)
• 3D display
of a TIN.
DTM – TIN 3 D display of topography
ArcGIS
HydraulicHydrology
![Page 37: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/37.jpg)
DTM – TINDisplay of buildings
• Embedding Buildings into the TIN.
ArcGIS
Hydraulic
Hydrology
![Page 38: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/38.jpg)
Topographic survey:
Cross Sections
• Stream centerline.• Banks.• Flow paths.• Cross sections.
ArcGIS
HydraulicHydrology
![Page 39: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/39.jpg)
Hydraulic Modelling
• stream geometry.
• Cross-sections extracted from the TIN.
ArcGIS
HydraulicHydrology
![Page 40: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/40.jpg)
Hydraulic Modelling
• Water surface elevations.
ArcGIS
HydraulicHydrology
![Page 41: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/41.jpg)
Floodplain Mapping
• Floodplain
ArcGIS
HydraulicHydrology
![Page 42: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/42.jpg)
Floodplain Mapping
• 2-D floodplain animation.
ArcGIS
HydraulicHydrology
![Page 43: FLOOD MAPPING Menaxhimi i rezikut te permbytjeve Objektivat Gjenerale](https://reader031.vdocument.in/reader031/viewer/2022012402/5697bf7b1a28abf838c83702/html5/thumbnails/43.jpg)
Floodplain Mapping
• 3-D floodplain animation.