33rdrd IMPACT WORKSHOP IMPACT WORKSHOPBrembo-Adda test caseBrembo-Adda test case

Fabrizio Savi, University of Rome “La Sapienza”Fabrizio Savi, University of Rome “La Sapienza”

On 25-28 November due to heavy rainfalls in On 25-28 November due to heavy rainfalls in Alpine Region (Northern Italy) a significant flood Alpine Region (Northern Italy) a significant flood propagated along Adda river and inundated a wide propagated along Adda river and inundated a wide portion of the riverside and the city of Lodiportion of the riverside and the city of Lodi

Description of the Description of the hydrographic networkhydrographic network

L=131 km

L=50 km

L=98 km

Stream gauging stationsStream gauging stations

For each gauging stationFor each gauging station Semi-hourly water stages hydrographsSemi-hourly water stages hydrographs Rating curve Rating curve are availableare available

Brembo at Ponte Briolo

211

212

213

214

215

216

217

218

02/11/2002 0.00 09/11/2002 0.00 16/11/2002 0.00 23/11/2002 0.00 30/11/2002 0.00

Y (

m a

sl)

Brembo at Ponte Briolo

210

211

212

213

214

215

216

217

218

219

0 200 400 600 800 1000 1200 1400 1600 1800 2000Q (m³/s)

Y (

m a

sl)

Brembo at Ponte Briolo

0

200

400

600

800

1000

1200

02/11/2002 0.00 09/11/2002 0.00 16/11/2002 0.00 23/11/2002 0.00 30/11/2002 0.00

Q (

m3 /s

)

Maximum water levels during floodMaximum water levels during floodwere also measured in 117 pointswere also measured in 117 points

40

80

120

160

0 40000 80000 120000x (m)

Y (

m a

sl)

Flooded areas by Adda river were also Flooded areas by Adda river were also contouredcontoured

Land surveysLand surveys

60.00

65.00

70.00

75.00

0 20 40 60 80 100 120 140 160

PROGRESSIVA (m)

QU

OT

A (

m s

.m.)

Q. TERRENO

Z1

Z2

Z3

55.00

65.00

75.00

0.00 100.00

PROGRESSIVA (m)

QU

OT

A (

m s

.m.)

Q. TERRENO

Z1

Z2

120

130

140

150

0 100 200 300

PROGRESSIVA (m)

QU

OTA

(m

s.m

.)

Q. TERRENO

Z1

Z2

Z3

SEZIONE 33 BREMBO

210.00

215.00

220.00

225.00

230.00

235.00

240.00

245.00

250.00

0 100 200 300 400 500 600 700 800 900

PROGRESSIVA (m)

QU

OTA

(m

s.m

.)

Q. Terreno

210.00

215.00

220.00

225.00

230.00

235.00

0.00 20.00 40.00 60.00 80.00

PROGRESSIVA (m)

QU

OTA

(m

s.m

.)

Q. TERRENO

Z2

Z3

The values of the Manning roughness coefficient The values of the Manning roughness coefficient can be estimated on the basis:can be estimated on the basis:maps of the soil use in the floodplainmaps of the soil use in the floodplainmean particle size of the river bed materialmean particle size of the river bed materialphotographs of revetments photographs of revetments

0

10

20

30

40

50

0 40 80 120x (km)

D50

(m

m)

65

67

69

0 86400 172800 259200 345600 432000 518400t (s)

Y (

m s

lm)

observed

computed

ConclusionsConclusionsInput data:Input data: Discharge hydrographs at the upstream sections of Discharge hydrographs at the upstream sections of

hydrographic network (XLS format)hydrographic network (XLS format) Stages hydrograph at the downstream section of Stages hydrograph at the downstream section of

hydrographic network (XLS format)hydrographic network (XLS format) Cross sections (including Manning roughness Cross sections (including Manning roughness

coefficient) (XLS-ASCII format) coefficient) (XLS-ASCII format) DTM of the valleys (DWG format) DTM of the valleys (DWG format)

Data to verify the model:Data to verify the model: Stages hydrograph at intermediate section (XLS)Stages hydrograph at intermediate section (XLS)

Maximum observed water stages along the water courses Maximum observed water stages along the water courses (XLS format)(XLS format)

Extension of the inundated areas (along Adda river) Extension of the inundated areas (along Adda river) (DWG format)(DWG format)

Adda at Lavello

0

200

400

600

800

1000

1200

02/11/2002 0.00 07/11/2002 0.00 12/11/2002 0.00 17/11/2002 0.00 22/11/2002 0.00 27/11/2002 0.00 02/12/2002 0.00

Q (

m³/

s)

Serio at Ponte Cene

0

200

400

600

800

1000

1200

02/11/2002 0.00 07/11/2002 0.00 12/11/2002 0.00 17/11/2002 0.00 22/11/2002 0.00 27/11/2002 0.00 02/12/2002 0.00

Q (

m³/

s)

Brembo at San Pellegrino

0

200

400

600

800

1000

1200

02/11/2002 0.00 09/11/2002 0.00 16/11/2002 0.00 23/11/2002 0.00 30/11/2002 0.00

Q (

m³/

s)

Brembo at Ponte Briolo

0

200

400

600

800

1000

1200

02/11/2002 0.00 09/11/2002 0.00 16/11/2002 0.00 23/11/2002 0.00 30/11/2002 0.00

Q (

m3 /s

)

Adda at Pizzighettone

40

42

44

02/11/2002 0.00 09/11/2002 0.00 16/11/2002 0.00 23/11/2002 0.00 30/11/2002 0.00

Y (

m a

sl)

Adda at Lodi

64

65

66

67

68

69

02/11/2002 0.00 09/11/2002 0.00 16/11/2002 0.00 23/11/2002 0.00 30/11/2002 0.00

Y (

m a

sl)