Anna Malago` July, 17 th 2013

Transcription

1 Department of Engineering - University of Ferrara Anna Malago` July, 17 th 2013 Eng. Anna Malago` - PhD student at Ferrara University Water Resources Unit Institute for Environment and Sustainability Joint Research Centre - European Commission Via Fermi, TP Ispra (VA) - ITALY 1

2 EuroSWAT: Comparing calibrated parameter sets for the Scandinavian Peninsula and for the Iberian Peninsula Introduction and main goals Model set up Scandinavia Peninsula and Iberian Peninsula Input data Methodology Sensitivity analysis Multi-objective calibration and regionalization Results Conclusions and comments 2

3 INTRODUCTION Implementation of European environmental legislation: the main goal of the WFD is the implementation of river basin water management plans in order to ensure by year 2020 the availability of good quality water for sustainable and equitable use Large-scale modeling with SWAT: step-wise calibration and hydrological regionalization Study of spatial variability of calibrated parameter sets for streamflow: cases studied Scandinavia and Iberian Peninsulas 3

4 INTRODUCTION main goals 1) what are the most relevant hydrological processes in each studied region? 2) what is the spatial variation of optimal parameters in these regions? 4

5 Scandinavian peninsula MODEL SET-UP Iberian peninsula 1,001,736 km sub-basins 347 gauged sub-basins 61 gauged head sub-basins 556,088 km 2 km sub-basins 215 gauged sub-basins 81 gauged head sub-basins Input: digital elevation model, elevation bands, land use, soils, reservoirs and climate data 5

6 METHODOLOGY Selection head subbasins with daily discharge data CHECK DATA NO not considered gauged sub-basins with wrong data SI SET-UP SWAT MODEL FOR CALIBRATION Separation daily flow in baseflow (BF), interflow (LF) and overland flow (SR) SWAT FILTER SELECTION PARAMETERS TO CALIBRATE STEP WISE CALIBRATION SWAT-CUP SUFI2 18 par. STEP1: 5 STEP2: 3 STEP3: 4 STEP4: 6 6

7 Calibrated parameter sets Sensitivity analysis for each step in order to define sensitive sub-basins STEP1: snow process parameters: SFTMP-SMTMP-PLAPS-TLAPS-TIMP time step: month year: n.simulation:1000 goal:r2 STEP WISE CALIBRATION SWAT-CUP SUFI2 Best Parameters If 2.7ϭ i,j < 0.1 sub-basin no sensitive Step i, Sample data j with objective function values for each sub-basins obtained from 1000 simulations Variation in parameter optima (graphs and maps) METHODOLOGY STEP2: runoff process parameters: CN2-SMFMX-SMFMN time step: day year: n.simulation:1000 goal:br2 STEP3: lateral flow process parameters: ESCO-EPCO-SOL_AWC-SOL_K time step:day year: n.simulation:1000 goal:br2 STEP4: groundwater process parameters: ALPHA_BF-GW_DELAY-GWQMN GW_REVAP-REVAPMN-RCHRG_DP time step: month year: n.simulation:1000 goal:br2 Best Parameters Best Parameters Best Parameters Transpose calibrated parameter sets using Regionalization Techniques Cluster analysis or Classification Calibrated Head Sub-basins 7

8 Cumulative frequency Cumulative frequency Cumulative frequency Cumulative frequency 8 RESULTS Calibration head sub-basins Scandinavian Peninsula- 61 head gauged sub-basins DEF CAL Iberian Peninsula- 81 head gauged sub-basins DEF CAL br br2 DEF CAL DEF CAL NSE NSE

9 9 RESULTS Sensitivity at each step of calibration STEP1: snow process parameters: SFTMP-SMTMP-PLAPS-TLAPS-TIMP time step: month year: n.simulation:1000 goal:r2 Sensitive sub-basins 97% 4% sub-basins sub-basins Ranges of parameter optima

10 RESULTS Spatial variation in parameter optima - MAPS 10

11 11 RESULTS Sensitivity at each step of calibration STEP2: runoff process parameters: CN2-SMFMX-SMFMN time step: day year: n.simulation:1000 goal:br2 Sensitive sub-basins 11% 12% Ranges of parameter optima sub-basins sub-basins

12 RESULTS Spatial variation in parameter optima - MAPS 12

13 13 RESULTS Sensitivity at each step of calibration STEP3: lateral flow process parameters: ESCO-EPCO-SOL_AWC-SOL_K time step: day year: n.simulation:1000 goal:br2 Sensitive sub-basins 3% 2% Ranges of parameter optima sub-basins sub-basins

14 14 RESULTS Sensitivity at each step of calibration STEP4: groundwater process parameters: ALPHA_BF-GW_DELAY-GWQMN (a) GW_REVAP-REVAPMN-RCHRG_DP (b) time step: month year: n.simulation:1000 goal:br2 Sensitive sub-basins 100% 98% sub-basins sub-basins

15 RESULTS Spatial variation in parameter optima - MAPS 15

16 Cumulative frequency Cumulative frequency Cumulative frequency Cumulative frequency 16 Scandinavian Peninsula- 347 gauged sub-basins RESULTS Regionalization Iberian Peninsula- 215 gauged sub-basins DEF EXT DEF EXT br2 DEF EXT br2 DEF EXT NSE NSE

17 CONCLUSIONS AND COMMENTS 1) what are the most relevant hydrological processes in each studied region? Scandinavia Peninsula: Snow process and groundwater process Iberian Peninsula: groundwater process 2) what is the spatial variation of optimal parameters in these regions? The spatial variation was studied using 1000 objective functions for each step-wise of calibration and for each sub-basins. Each sub-basins was defined sensitive or not using parameters of descriptive statistic. Using only sensitive sub-basins, the optimal range of calibrated parameters was defined for each calibrated parameters Maps of optimal parameters was developed and assessed 17

18 CONCLUSIONS AND COMMENTS These spatial analyses are helpful in understanding and evaluating results of the step-wise calibration and to assess the physical soundness of parameter sets. The step wise calibration of flow has allowed to create robust large-scale hydrological models for all Europe On going at pan European scale we are studying the new calibration procedure to assess erosion and nutrient process, with particular attention to investigate how the connectivity between hydrological and biogeochemical processes across time and space affects structure and function of aquatic ecosystem 18

19 Department of Engineering - University of Ferrara Anna Malago` July, 17 th 2013 Eng. Anna Malago` - PhD student at Ferrara University Water Resources Unit Institute for Environment and Sustainability Joint Research Centre - European Commission Via Fermi, TP Ispra (VA) - ITALY 19

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