DEMONSTRATION OF WAMM TECHNOLOGY PILOT PROJECT IN THE RIVER (IT)

Ing. Luz Sainz, SGI SpA DESCRIPTION OF THE RIVER BASIN

Fella Degano But

Pinzano • Basin area 2800 Km2 • Mountainous basin 2400 Km2 • River length 178 Km • Main tributaries: Fella, But and Degano

Latisana • River bed width: 160 -3500 m SPATIAL DISTRIBUTION OF YEARLY AVERAGE RAINFALL

High rainfall regime 2000 - 3000 mm/yr

Max 400 mm/day HISTORIC EVOLUTION OF THE LOWER COURSE

• river bed width 100-180 m • embankment height 5-6 m

Flood risk at the lower course of the river Event of 1966 Qmax = 3750 m3/s Concurrent flood event and tidal surge ACTIVITIES:

• Modelling with the MIKE11 Suite

• SAR Technology Application

• Enhanced model calibration with

• Installation of small portable sensors

• Climate Change Scenarios MIKE 11 (DHI) one dimensional model

Simulates unsteady flows in rivers, channels, estuaries …

TIME TOPOGRAPHIC SERIES DATA HYDROLOGICAL MODEL NAM

HYDRODYNAMIC MODEL MIKE11 HD

LEGEND FLOOD MAPPING AERIAL MODEL PHOTOS, INPUT data DEM MIKE11 GIS MAPS WAMM DSS

FLOOD FORECASTING TELEMETRY & MODEL WEATHER MIKE11 FF FORECAST HYDROLOGICAL MODELLING - MIKE11 NAM

4 7

3 5 6 DEGANO BUT 1 2 8 TAGLIAMENTO FELLA 9 10

1 Ponte Sacrovint

2 Casali Davaris TAGLIAMENTO 3 Ponte a San Martino 4 S. Giorgo 5 San Nicolo 6 Ponte Lovea 7 8 9 Potclamaz 10 Pioverno

Rainfall gauges Flow meters DEVELOPMENT OF THE GIS (ArcView) HYDROLOGICAL CALIBRATION - NAM

Data required: Watershed features (topography, soil type…) Time series (rainfall, potential evaporation ...) Hydrology Parameters NAM Discharge measurements HYDROLOGICAL CALIBRATION - NAM

# # # #

# # Mountainous catchment # # # # # # # # # # # # ### # # # # # # # # # # # # # # # # # # # # # # # # # Simulated vs. measured # # # # # discharge at # # # ## #

# # # # Good fit of peak flows # #

#

#

#

##

simulated

observed HYDRODYNAMIC MODELLING - MIKE11 HD

Data required: Cross sections topography Structures (bridges, overflow channels…) Time series (boundary conditions) Roughness Coefficient (Kstrickler 35-22)

Time series for calibration CALIBRATION OF MIKE 11 HD CURRENT MONITORING SYSTEM

Rainfall gauges Level meters

CHIARSO Sea level Rating curve DEGANO BUT

TAGLIAMENTO FELLA RESIA

TAGLIAMENTO CALIBRATION OF MIKE 11 HD

Flood events:

21-24 June 96, Qmax = 3.000 m3/s 15-19 October 96, Qmax = 750 m3/s 13-15 November 96, Qmax = 3.000 m3/s (SAR calibration)

27-30 June 97, Qmax = 570 m3/s 7-14 November 97, Qmax = 900 m3/s 19-23 December 97, Qmax = 730 m3/s

11-14 September 98, Qmax = 1.600 m3/s 5-9 October 98, Qmax = 2.300 m3/s

Boundary conditions

• Upstream: Rating curve at Pioverno

• Downstream: Sea levels CALIBRATION OF MIKE 11 HD

Rating curve at Pioverno

The mobile cross section requires Pioverno continuous upgrading Venzone Levels measured at Venzone

Distance Pioverno-Venzone: 750 m

Inflows to the model

• Correlated levels Venzone - Pioverno

hp=0.1996hv2+0.532hv+0.4073

• Application of rating curve at Pioverno CALIBRATION OF MIKE11 HD

Tuning of roughness coefficients K Strickler 35 -22 Head losses in the bridge structures

Observed

Simulated

Comparison between simulated and measured levels, Flood 14 November 1996 EXPLOITATION OF THE SAR IMAGERY

Processing of SAR images carried out by FUSAGx:

• Flooded areas mapping: 15 November 1996 (flood) 11 October 1996 (base flow)

• Soil moisture mapping 7-8 May 1996 12 June 1996 15 November 1996 11 October 1996 FLOOD MAPPING WITH MIKE11 GIS

DEM MIKE11 HD

FLOOD MAPPING (MIKE11 GIS):

Flood mapping - level / area Duration of floods Comparison maps - impacts in different situations WAMM: CALIBRATION OF THE FLOODED AREAS (MIKE11 GIS - SAR IMAGERY)

Results MIKE11 GIS

15 November 1996 at 12.00

Comparison with SAR images TAGLIAMENTO BASIN CLIMATIC CHANGE SCENARIOS

Precipitation increase

2020-2039

Global Circulation Models 2.5 2

• HCGS Hadley Center GCM 1.5 HCGS 2039 1 CCGS 2039 • CCGS Canadian Climate Center Model 0.5 0 jan feb mar apr maj jun jul aug sep okt nov dec

PIOVERNO FLOW LEVEL

Climatic change scenario

June 1996 INSTALLATION OF SMALL MOBILE SENSORS TO MEASURE RIVER LEVELS

Pressure transducers Small physical dimensions - 16 grams Easy installation

Their installation can be determined as the flood occurs

h1 h2 h3 h4 TEST OF FORECASTING FLOODS MIKE 11 FF

Pioverno Flow

Forecasted

Observed Simulated

Latisana Level CONCLUSIONS

Know-how transfer: • training • models, SAR software, instrumentation

Set up of flood forecasting model

Future use of WAMM as a river basin planning tool