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!!