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

Portugal activity report Rui Rivaes 1 , Patricia Rodríguez-González 1 , António Albuquerque 1 , Teresa Ferreira 1 , António Pinheiro 2 . 2 1

� Study site selection � Hydrological data � Field sampling � Hydraulic modeling � Field data processing � Vegetation model � Calibration and validation � Vegetation modeling � Scenarios 11 May 2010 RIPFLOW - Austria meeting 2

� Odelouca river � 511 km 2 basin � 92km long 11 May 2010 RIPFLOW - Austria meeting 3

� Typical mediterranean river with Winter torrential flow floods and dry bed in Summer � No flow regulation upstream the study site 11 May 2010 RIPFLOW - Austria meeting 4

� Odelouca study site � Near Ribeira place (37º23’04,98’’N 8º18’40,31’’W) • Since river thalweg until 140m elevation • Approximately 400m stream length • Near 5 ha area sampled 11 May 2010 RIPFLOW - Austria meeting 5

� “Monte dos Pachecos” flow meter � 39 years daily data 11 May 2010 RIPFLOW - Austria meeting 6

� Cumulative frequency analysis 11 May 2010 RIPFLOW - Austria meeting 7

� Precipitation analysis in river basin � Thiessen method 11 May 2010 RIPFLOW - Austria meeting 8

� Return period determination � Correspondence to study site basin Q SS = Q MP x (A SS /A MP ) x (P SS /P MP ) Study site Monte Pachecos 186 km 2 Area 386 km 2 Area Q (m 3 /s) Q (m 3 /s) T T 1,5 80 1,5 174 3 370 3 171 5 225 5 487 10 290 10 629 50 927 50 427 100 483 100 1047 11 May 2010 RIPFLOW - Austria meeting 9

� 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 11 May 2010 RIPFLOW - Austria meeting 10

� Abiotic data � Topography � Soil sampling 11 May 2010 RIPFLOW - Austria meeting 11

� Hec-ras for flow curve determination Water level modeling RIPFLOW Plan: Plan 01 05-03-2010 Legend Flow curve modeling WS T1 Ground RIPFLOW Plan: Plan 01 22-04-2010 Bank Sta 137 Legend 19 13 W.S. Elev 17 20 136 14 11 16 15 W.S. Elev (m) 10 135 9 21 22 134 25 7 6 24 23 133 4 3 132 0 100 200 300 400 500 Q Total (m3/s) 11 May 2010 RIPFLOW - Austria meeting 12

� RIVER2D for flow modeling Bed roughness Water velocity Bed elevation 11 May 2010 RIPFLOW - Austria meeting 13

� Biological data � Age of vegetation polygons from cores and tree rings 11 May 2010 RIPFLOW - Austria meeting 14

� Biological data � Translate field data into Vegetation Types 11 May 2010 RIPFLOW - Austria meeting 15

� Soil analysis – 13 soil types � Organic matter � Texture 11 May 2010 RIPFLOW - Austria meeting 16

� Map construction for vegetation model input Height over base flow Topography Shear stress Zones 11 May 2010 RIPFLOW - Austria meeting 17

� Vegetation model workshop in Austria � Start condition modeling � Vegetation modeling Model Start Condition Reality 11 May 2010 RIPFLOW - Austria meeting 18

� Height over base flow • No diference between Height over base flow tamarisks and willows 8 • Quercus, ash-trees 6 and tamarisks/Willows at different heights 4 Pixel Height (m) • Regeneration at lower level 2 • Herbs, open sand bar 0 and sparse vegetation at aproximately same -2 tamarisks/willows water -4 height Water Open sand bar Sparse vegetation Wetland Reed Herbs Tmx/Slx reg Tmx/Slx srb Yng Tmx/Slx Old Tmx/Slx Ash-tree Quecus Median 25%-75% Non-Outlier Range Outliers Extrem es Vegetation type 11 May 2010 RIPFLOW - Austria meeting 19

� Representativeness of vegetation types in study site Vegetation type Area (m 2 ) % Water 2042 7 Open sand bar 4973 23 Sparse vegetation 1597 Wetland 0 (0.25) 0 Reed 20 0 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 11 May 2010 RIPFLOW - Austria meeting 20

� Start condition calibration Height over base flow 8 6 4 Pixel Height (m) Height over base flow classes Lower limit Upper limit 2 (m) (m) -100.000000 -0.103470 Water 0 -0.103470 0.363000 Open Sand bar 0.363000 0.683000 Tmx/Slx regeneration -2 0.683000 2.778000 Tmx/Slx -4 2.778000 3.405000 Ash-tree forest Water Open sand bar Sparse vegetation Wetland Reed Herbs Tmx/Slx reg Tmx/Slx srb Yng Tmx/Slx Old Tmx/Slx Ash-tree Quecus 3.405000 100.000000 Quercus forest Median 25%-75% Non-Outlier Range Outliers Extrem es Vegetation type 11 May 2010 RIPFLOW - Austria meeting 21

� Start condition calibration � Calibrated start condition 11 May 2010 RIPFLOW - Austria meeting 22

� Start condition calibration � Similarity between calibrated start condition and reality 54% identical pixels 11 May 2010 RIPFLOW - Austria meeting 23

� Model validation � Calibrated start condition � Hydrological data � Modeling with natural flow regime 11 May 2010 RIPFLOW - Austria meeting 24

� Two climate change scenarios � Optimistic and pessimist approaches 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) 11 May 2010 RIPFLOW - Austria meeting 25

� 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 11 May 2010 RIPFLOW - Austria meeting 26

� FCT (Portuguese Science and Technology Foundation) � To Eng. Mário Tavares, from National Biologic Resources Institute, for the logistic support 11 May 2010 RIPFLOW - Austria meeting 27