Beta Release of Delta Evapotranspiration of Applied Water (DETAW v2.0)

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Presentation transcript:

Beta Release of Delta Evapotranspiration of Applied Water (DETAW v2.0) Lan Liang Bay-Delta Office Department of Water Resources Delta Modeling User Group June 20th, 2018

Acknowledgements DWR Bay-Delta Office: Tariq Kadir, Bob Suits, Nicky Sandhu, Tara Smith, Jon Shu, Wenli Yin, Yu Zhou DWR Division of Statewide Integrated Water Management Morteza Orang UC Davis Richard L. Snyder

Model Development History Delta consumptive use models in use in Bay-Delta Office CU DICU DETAW v1.0 DETAW v2.0

DETAW V2.0 vs DETAW V1.0 Improvements in DETAW v2.0 Platform from C++ to Python Save code running time Output format from Excel to DSS files Calibration of crop coefficients based on remote sensing data Seepage rates

Principle behind DETAW V2.0 Island root zone water balance on each of 15 crop categories and 168 sub-areas: Crop ET = effective irrigation+ effective seepage + effective rainfall + soil moisture change

Characteristics of DETAW V2.0 Beta Release Estimates the actual ET and crop needed applied water, effective precipitation and effective seepage. Etc Calibrated and validated with SEBAL 2007 and 2009 data Daily time step 168 sub-areas and 15 crop categories Simulation periods: WY1922 – 2016 Two land use sets: historical simulation and projected simulation

Performance of DETAW v2.0 Historical Simulation 2007 2009 TAF Calibration SEBAL: 1644 TAF DETAW v2.0: 1667 TAF Difference: 1.3% Validation SEBAL: 1648 TAF DETAW v2.0: 1675 TAF Difference: 1.6%

All seven methods are within 11% of the average ET. 2015 Delta crop ET comparison of seven models initiated by Delta Watermaster through UCDavis Agricultural lands only. About 30% of Delta Service Area is not included. All seven methods are within 11% of the average ET. 2015 2016 From the draft report “Estimation of Crop Evapotranspiration in the Sacramento-San Joaquin Delta”

DETAW v2.0 Beta Release Package Linkage to the DETAW V2.0 model package https://data.cnra.ca.gov/dataset/detaw-v2-0 Contact Min Yu, minyu@water.ca.gov

DETAW v2.0 Beta Release Package Technical reports User’s manual Two sets of land use data Inputs and code

File Structure of DETAW v2.0 Historical Simulation Inputs Outputs Input 1: Main control DETAW_para.inp Input 2: Precipitation mm_pcp.csv Daily outputs: DETAW_day_**.dss Input 3: Daily temperature at Lodi LODI_PT.csv Run DETAW model: DETAW.py Input 4: Crop information critical.csv and noncritical.csv Input 5: Land use of 168 subareas in subfolder \Historical Monthly output: DETAW_month.dss Input 6: Precipitation and ETo correction factors, Percentage.csv

Input 1: Main Control

Input 2: Daily Precipitation No data at Brentwood, Galt, and Rio Vista now. Their precipitations are estimated by the correlations with those at other stations.

Input 3: Daily Temperature Data source of precipitation and temperature: Statewide Integrated Pest Management, University of California

Input 4: Crop Information Critical set and noncritical set for different water years Irrigation season for each of 15 crop categories Soil depth Rooting depth Crop coefficients for each phase during the growth season

Input 4: Crop Information

Input 5: Land Use Two sets of land use: 168 files of historical simulation and 168 files of projected simulation Each file has the annual acreages of 15 crop categories of one island. Unit: Hectare

Input 6: Precipitation and ETo Correction Factors Theissen Polygon The correction factors were determined by the errors between CIMIS ETo and the estimated ETo at Lodi.

Run DETAW v2.0 Install Python Install Command Prompt (optional)

Outputs Daily Outputs DETAW_day_##.dss: daily crop ET and other terms from 1922 through 2016 for 15 crop categories and 10 or 8 islands 17 DSS files for 168 islands Monthly outputs DETAW_month.dss: monthly crop ET and other terms from 1922 through 2016 for 15 crop categories and 168 islands

Conclusion It is Beta release. Any suggestions or questions are welcome. The documents can provide answers for most technical questions. The Delta crop ET has been calibrated and validated. However, the local crop ET is still under investigation.