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VIC-CropSyst

VIC-CropSyst . Sep 16, 2011. Outline. Overview Modeling Approach Data and parameterization Challenges ahead. Overview. VIC-CropSyst. VIC Hydrology Liang et al, 1994 . CropSyst Cropping Systems Stockle and Nelson 1994 . Overview of Framework.

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VIC-CropSyst

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  1. VIC-CropSyst Sep 16, 2011

  2. Outline • Overview • Modeling Approach • Data and parameterization • Challenges ahead

  3. Overview

  4. VIC-CropSyst VIC Hydrology Liang et al, 1994 CropSyst Cropping Systems Stockle and Nelson 1994

  5. Overview of Framework

  6. Modeling Approach – specific to VIC-CropSyst

  7. VIC-CropSyst Model VIC CropSyst 1. Weather (D) 2. Soil Soil layer depths Soil water content 3. Water flux (D) Infiltrated water 4. Crop type Irrigation water = Crop Water Demand /irrigation efficiency Sow date Crop interception capacity Crop phenology Crop uptake (D) Water stress (D) Current biomass (D) Crop Water demand (D) Harvest day Crop Yield D – communicated daily

  8. VIC-CropSyst : Coupling Approach T T – Transpiration IP – Interception capacity I – Infiltration Ir – irrigation Wd- Water demand Q – Runoff Q01 – Drainage from 0 to 1 Q02 – Drainage from 0 to 2 Qb– Baseflow W0 – water content in 0 W1 – water content in 1 W2 - water content in 2 Tmin, Tmax – daily minimum and maximum temperature Ws – wind speed RH – Relative humidity SR – Solar radiation IP Ir I Q T0, T1, T2, IP, Wd Q01 Daily Tmin, Tmax, Ws, RH, SR, I Q12 Redistribute I, W0, W1 and W2 to CropSyst layers W0,W1, W2 Qb CropSyst VIC

  9. Invoking CropSyst within VIC gridcell Crop 2 CropSyst is invoked Crop 1 CropSyst is invoked Non-Crop Vegetation VIC grid cell (resolution=1/16° ~ 33 km2 ) Within the cell, VIC does not identify the geographical locations of the crops

  10. VIC-CropSyst integration - Time view Total yield, Biomass etc At the beginning of each daily time step To CropSyst Weather condition Irrigation- add 20mm if the need ≥ 20 mm Crop type, Soil texture Start looking for sow day Crop 1 Crop harvest date VIC grid cell Crop emerges 0 Time At the end of each daily time step From CropSyst Irrigation need Transpiration

  11. Time view Total yield, Biomass etc Crop type 2, Soil texture Sow date- Start crop growing Crop 2 Crop harvest date Crop 1 0 Total yield, Biomass etc At the beginning of each daily time step To CropSyst Weather Irrigation if needed The crop parameters both physical and management can change between crops within the same VIC grid cell. At the beginning of each daily time step To CropSyst Weather Irrigation if needed Crop type 1, Soil texture Sow date- Start crop growing Crop harvest date First clipping Second clipping 0

  12. Selective deficit irrigation - Curtailment cells are identified from the water rights data -Low value crops are curtailed before curtailing the high value crops - Monthly curtailments are disaggregated to grid cell and crop specific reduction in irrigated water For a low value crop selected for curtailment Under full irrigation Under deficit irrigation Month scale

  13. Data and parameterization

  14. Input to VIC-CropSyst CropSyst parameter files Crop specific parameters files Phenology adjusted files Soil parameter files County – gridcell association information VIC-CropSyst Met data VIC parameter files Global control file Veg parameter file Veg library Soil data Snow bands data Crop library Crop parameter file

  15. Crop Land Data Layers WSDA – Washington State Department of Agriculture USDA – US Department of Agriculture

  16. Reconciling USDA and WSDA

  17. Crops Modeled • Winter Wheat • Spring Wheat • Alfalfa • Barley • Potato • Corn • Corn, Sweet • Pasture • Apple • Cherry • Lentil • Mint • Hops Major Crops • Grape, Juice • Grape, Wine • Pea, Green • Pea, Dry • Sugarbeet • Canola • Onions • Asparagus • Carrots • Squash • Garlic • Spinach Berries • Grape, Juice • Grass hay • Bluegrass • Hay • Rye grass • Oats • Bean, green • Rye • Barley • Bean, dry • Bean, green Other Pastures • Caneberry • Blueberry • Cranberry • Pear • Peaches Other Tree fruits Lentil/Wheat type Generic Vegetables

  18. Crop specific parameters • Each crop has a parameter file [phenology] maturity_significant=true emergence= flowering=850 peak_LAI=800 filling=950 maturity=1500 senescence=1000 tuber_init= resolution=day base_temp=5 cutoff_temp=25 maximum_temp=25 …. [transpiration] ET_crop_coef=1.23 max_water_uptake=13 stomatal_closure_leaf_water_pot=-1300 wilt_leaf_water_pot=-2000 [canopy_cover] initial_cover=0.05 maximum_cover=0.85 mature_green_cover=0.2 mature_total_cover=0.7 …

  19. Phenologyparameters adjustments

  20. Phenologyparameters adjustments Crop parameter file Downscaled Met data Crop present in the grid cell? Calibration (independent code) New phenology crop parameter file- adjust is specific to the geographic location of the cell. This is a pre-processor and creates “xxx_adjusted” file for each crop

  21. County yield adjustments • CropSyst yields are dry yields and cannot be directly compared to the NASS values • CropSyst assumes optimum conditions and does not account for losses due to pests, diseases etc • Adjusted based on observed data • Observed yield data available only at county or State scale • Adjustments are currently hard coded

  22. CropSyst soil data • Current VIC soil data was too course for CropSyst • STATSGO based soil data is used by the CropSyst for estimating the soil properties

  23. Input to VIC-CropSyst CropSyst parameter files Crop specific parameters files Phenology adjusted files Soil parameter files County – gridcell association information Met data VIC-CropSyst VIC parameter files Global control file Veg parameter file Veg library Soil data Snow bands data Crop library Crop parameter file

  24. Veg parameter file • Traditional land cover inputs to VIC • Vegetation library file • Vegetation parameter file 1…. 60.0 … Evergreen Needleleaf 2…. 60.0 … Evergreen Broadleaf … 10.......... 11……. 272002 2 100.550000 0.10 0.10 1.00 0.65 0.50 0.25 0.013 0.038 0.038 0.038 0.025 0.562 1.237 1.312 0.325 0.025 0.025 0.025 110.450000 0.10 0.10 1.00 0.70 0.50 0.20 0.225 0.262 0.287 0.375 0.712 1.212 0.913 0.600 0.412 0.275 0.225 0.213

  25. New parameter files related to crop distribution • Crop library file • Crop parameter file 204 Corn 205 CornUnknown 210 SpgWheat 218 WinWheat Alfalfa ….. 315617 6 2100.0170006090 2180.14500026590 701 0.02439011 1 14010.0553001201 18140.01233060410 18270.1964006090 • Crop code • Fraction of the cell • Day of the crop creation • Irrigation identifier • Perennial crop identifier

  26. Veg parameter file for VIC-CropSyst • Vegetation library file • Vegetation parameter file 1…. 60.0 … Evergreen Needleleaf … .......... 11……. 204……. Corn 205….. CornUnknown 272002 2 100.550000 0.10 0.10 1.00 0.65 0.50 0.25 0.013 0.038 0.038 0.038 0.025 0.562 1.237 1.312 0.325 0.025 0.025 0.025 ….. 2050.1300000.10 0.10 1.00 0.70 0.50 0.20 0.225 0.262 0.287 0.375 0.712 1.212 0.913 0.600 0.412 0.275 0.225 0.213

  27. Challenges ahead

  28. Future work • VIC soil data – should be redone • Crop land data layer – discrepancies between data sources must be resolved • Irrigation data for other States • Crop rotation • Conveyance loss is currently not modeled • Groundwater component • Calibration of “VIC-CropSyst”

  29. THANK YOU!!

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