Portugal activity report Rui Rivaes 1 , Patricia Rodrguez-Gonzlez 1 , - - PowerPoint PPT Presentation

Portugal activity report

Rui Rivaes1, Patricia Rodríguez-González1, António Albuquerque1, Teresa Ferreira1, António Pinheiro2.

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Study site selection Hydrological data Field sampling Hydraulic modeling Field data processing Vegetation model Calibration and validation Vegetation modeling Scenarios

RIPFLOW - Austria meeting 11 May 2010 2

Odelouca river 511 km2 basin 92km long

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Typical mediterranean river with

Winter torrential flow floods and dry bed in Summer

No flow regulation upstream the

study site

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Odelouca study site

Near Ribeira place (37º23’04,98’’N

8º18’40,31’’W)

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• Since river thalweg until

140m elevation

• Approximately 400m

stream length

• Near 5 ha area sampled

“Monte dos Pachecos” flow meter 39 years daily data

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Cumulative frequency analysis

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Precipitation analysis in river basin

Thiessen method

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Return period determination Correspondence to study site

basin

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Monte Pachecos 386 km2 Area T Q (m3/s) 1,5 174 3 370 5 487 10 629 50 927 100 1047 Study site 186 km2 Area T Q (m3/s) 1,5 80 3 171 5 225 10 290 50 427 100 483

QSS = QMP x (ASS/AMP) x (PSS/PMP)

Biological data

General stream characterization Study site data collection

○ Patch georeferencing ○ Vegetation sampling ○ Biometric data (H and Ø)

and collection of samples (cores and disks) for patch aging

Reference sites data

collection

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Abiotic data

Topography Soil sampling

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Hec-ras for flow curve

determination

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25 24 23 22 21 20 19 17 16 15 14 13 11 10 9 7 6 4 3

RIPFLOW Plan: Plan 01 05-03-2010

Legend WS T1 Ground Bank Sta 100 200 300 400 500 132 133 134 135 136 137

RIPFLOW Plan: Plan 01 22-04-2010

Q Total (m3/s) W.S. Elev (m) Legend W.S. Elev

Water level modeling Flow curve modeling

RIVER2D for flow modeling

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Bed roughness Bed elevation Water velocity

Biological data

Age of vegetation polygons from

cores and tree rings

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Biological data

Translate field data into Vegetation

Types

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Soil analysis – 13 soil types

Organic matter Texture

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Map construction for vegetation

model input

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Topography Zones Shear stress Height over base flow

Vegetation model workshop in

Austria

Start condition modeling Vegetation modeling

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Model Start Condition Reality

Height over base flow

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Height over base flow

Median 25%-75% Non-Outlier Range Outliers Extrem es Water Open sand bar Sparse vegetation Wetland Reed Herbs Tmx/Slx reg Tmx/Slx srb Yng Tmx/Slx Old Tmx/Slx Ash-tree Quecus Vegetation type

• 4
• 2

2 4 6 8 Pixel Height (m)

• No diference between

tamarisks and willows

• Quercus, ash-trees

and tamarisks/Willows at different heights

• Regeneration at lower

level

• Herbs, open sand bar

and sparse vegetation at aproximately same tamarisks/willows water height

Representativeness of vegetation

types in study site

RIPFLOW - Austria meeting 11 May 2010 20 Vegetation type Area (m2) % Water 2042 7 Open sand bar 4973 23 Sparse vegetation 1597 Wetland 0 (0.25) Reed 20 Tmx/Slx regeneration 1359 5 Herbs 1623 25 Shrubby Tmx/Slx 3378 Young Tmx/Slx 419 Old Tmx/Slx 1702 Ash-tree forest 11083 39 Quercus 299 1 Total 28495 100

Start condition calibration

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Height over base flow

Median 25%-75% Non-Outlier Range Outliers Extrem es Water Open sand bar Sparse vegetation Wetland Reed Herbs Tmx/Slx reg Tmx/Slx srb Yng Tmx/Slx Old Tmx/Slx Ash-tree Quecus Vegetation type

• 4
• 2

2 4 6 8 Pixel Height (m)

Height over base flow classes Lower limit (m) Upper limit (m) Water

• 100.000000
• 0.103470

Open Sand bar

• 0.103470

0.363000

Tmx/Slx regeneration

0.363000 0.683000

Tmx/Slx

0.683000 2.778000

Ash-tree forest

2.778000 3.405000

Quercus forest

3.405000 100.000000

Start condition calibration

Calibrated start condition

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Start condition calibration

Similarity between calibrated start

condition and reality

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54% identical pixels

Model validation

Calibrated start condition Hydrological data Modeling with natural flow regime

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Two climate change scenarios Optimistic and pessimist

approaches

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Climatic change scenario for next 100 years at Algarve region Variables Optimistic Pessimist Precipitation asymmetry Increase Increase Winter precipitation 30% increase 60% increase Spring precipitation 65% decrease 85% decrease Winter flow 60% increase 130% increase Summer flow 80% decrease 100% decrease

Source: SIAM Project (2006)

Aquatic zone definition in

intermittent flow regime rivers

Shear stress – different species,

different shear resistance?

Model citation – how do we do it? Meandering vs. linear reach -

calibration performance

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FCT (Portuguese Science and

Technology Foundation)

To Eng. Mário Tavares, from

National Biologic Resources Institute, for the logistic support

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