VIC-CropSyst Sep 16, 2011. Outline Overview Modeling Approach Data and parameterization ...
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Transcript of VIC-CropSyst Sep 16, 2011. Outline Overview Modeling Approach Data and parameterization ...
VIC-CropSyst
Sep 16, 2011
Outline
Overview Modeling Approach Data and parameterization Challenges ahead
Overview
VIC-CropSyst
VIC Hydrology
Liang et al, 1994
CropSystCropping Systems
Stockle and Nelson 1994
Overview of Framework
Modeling Approach – specific to VIC-CropSyst
VIC-CropSyst Model
1. Weather (D)
2. SoilSoil layer depths
Soil water content
3. Water flux (D)Infiltrated water
4. Crop type
Irrigation water = Crop Water Demand
/irrigation efficiency
Sow dateCrop interception
capacityCrop phenologyCrop uptake (D)Water stress (D)
Current biomass (D)Crop Water demand
(D)Harvest dayCrop Yield
VIC CropSyst
D – communicated daily
T – TranspirationIP – Interception capacityI – InfiltrationIr – irrigationWd- Water demandQ – RunoffQ01 – Drainage from 0 to 1Q02 – Drainage from 0 to 2Qb – BaseflowW0 – water content in 0W1 – water content in 1W2 - water content in 2Tmin, Tmax – daily minimum and maximum temperatureWs – wind speedRH – Relative humiditySR – Solar radiation
Qb
Q12
T
IP
Redistribute I, W0, W1 and W2 to CropSyst layers
Q
Q01
W0,W1, W2
T0, T1, T2, IP, Wd
I
CropSyst
VIC
Ir
Daily Tmin, Tmax, Ws, RH, SR, I
VIC-CropSyst : Coupling Approach
Invoking CropSyst within VIC gridcell
Crop 1
VIC grid cell(resolution=1/16° ~ 33 km2 )
Crop 2
Non-Crop
Vegetation
CropSyst is
invoked
CropSyst is
invoked
Within the cell, VIC does not identify the geographical locations of the crops
Crop type, Soiltexture
VIC-CropSyst integration - Time view
Time0
At the beginning of each daily time step
To CropSystWeather condition
Irrigation- add 20mm if the need ≥ 20 mm
Start looking for sow day
Crop harvest date
Total yield,Biomass
etc
Crop 1
At the end of each daily time stepFrom CropSystIrrigation needTranspiration
VIC grid cell Crop emerg
es
Crop 1
Crop 2
0
Crop type 2, Soiltexture
At the beginning of each daily time stepTo CropSyst
WeatherIrrigation if needed
Sow date-Start crop growing
Crop harvest date
Total yield,Biomass etc
The crop parameters both physical and management can change between crops within the same VIC grid cell.
Time view
0
At the beginning of each daily time stepTo CropSyst
WeatherIrrigation if needed
Sow date-Start crop growing
Crop harvest date
Total yield,Biomass etc
Crop type 1, Soiltexture
First clipping
Second clipping
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
Month scale
For a low value crop selected for curtailment Under full irrigation
Under deficit irrigation
Data and parameterization
VIC-CropSyst
a) Crop specific parameters files
b) Phenology adjusted files
Soil parameter files
County – gridcell association information
CropSyst parameter files
VIC parameter files
Met data
a) Global control file
b) Veg parameter file
c) Veg libraryd) Soil datae) Snow bands
data
a) Crop libraryb) Crop
parameter file
Input to VIC-CropSyst
Crop Land Data Layers
WSDA – Washington State Department of Agriculture
USDA – US Department of Agriculture
Reconciling USDA and WSDA
Crop Code WSDA name USDA name Model name218 Wheat WinWheat WinWheat210 Missing SpgWheat SpgWheat701 Alfalfa, Hay Alfalfa Alfalfa
1827 Potato Potatoes Potatoes204 Corn, Field Corn Corn
1208 Missing Pasture_Grass Pasture_Grass1401 Apple Apples Apples1803 Bean, Dry DryBeans DryBeans1804 Bean, Green Missing BeanGreen1824 Pea, Dry Peas Peas713 Grass, Hay Missing GrassHay
1814 Corn, Sweet SweetCorn SweetCorn1206 Missing NLCDPasture_Hay NLCDPasture_Hay1503 Bluegrass, Seed Missing BluegrassSeed703 Alfalfa/Grass, Hay Missing AlfalfaOrGrassHay
1403 Cherry CherryOrchard CherryOrchard1207 Missing OtherHays OtherHays
Crops Modeled
Winter Wheat Spring Wheat Alfalfa Barley Potato Corn Corn, Sweet Pasture Apple Cherry Lentil Mint Hops
Grape, Juice Grape, Wine Pea, Green Pea, Dry Sugarbeet Canola
Onions Asparagus Carrots Squash Garlic Spinach
Generic Vegetables
Grape, Juice Grass hay Bluegrass Hay Rye grass
Oats Bean, green Rye Barley Bean, dry Bean, green
Other Pastures
Lentil/Wheat type
Caneberry Blueberry Cranberry
Pear Peaches
Berries
Other Tree fruits
Major Crops
Crop specific parameters
Each crop has a parameter file[transpiration]ET_crop_coef=1.23max_water_uptake=13stomatal_closure_leaf_water_pot=-1300wilt_leaf_water_pot=-2000[canopy_cover]initial_cover=0.05 maximum_cover=0.85mature_green_cover=0.2mature_total_cover=0.7…
[phenology]maturity_significant=trueemergence=flowering=850peak_LAI=800filling=950maturity=1500senescence=1000tuber_init=resolution=daybase_temp=5cutoff_temp=25maximum_temp=25….
Phenology parameters adjustments
Phenology parameters adjustments
Calibration (independent code)
Crop parameter file
Downscaled Met data
Crop present in the grid
cell?
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
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
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
VIC-CropSyst
a) Crop specific parameters files
b) Phenology adjusted files
Soil parameter files
County – gridcell association information
CropSyst parameter files
VIC parameter files
Met data
a) Global control file
b) Veg parameter file
c) Veg libraryd) Soil datae) Snow bands
data
a) Crop libraryb) Crop
parameter file
Input to VIC-CropSyst
Traditional land cover inputs to VIC Vegetation library file
Vegetation parameter file
Veg parameter file
272002 2 10 0.550000 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
11 0.450000 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
1…. 60.0 … Evergreen Needleleaf
2…. 60.0 … Evergreen Broadleaf
…10..........11…….
New parameter files related to crop distribution
Crop library file
Crop parameter file
315617 6 210 0.017000 60 9 0 218 0.145000 265 9 0 701 0.024390 1 1 1 1401 0.055300 1 20 1 1814 0.012330 60 41 0 1827 0.196400 60 9 0
204 Corn205
CornUnknown210 SpgWheat218 WinWheat701 Alfalfa…..
•Crop code•Fraction of the cell•Day of the crop creation•Irrigation identifier•Perennial crop identifier
Vegetation library file
Vegetation parameter file
Veg parameter file for VIC-CropSyst
272002 2 10 0.550000 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
….. 205 0.130000 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
1…. 60.0 … Evergreen Needleleaf
…..........11…….204……. Corn205…..
CornUnknown
Challenges ahead
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”
THANK YOU!!