rgdss modeling meetings...typical sedimentary deposits by braided stream channels (top) and...
TRANSCRIPT
RGDSS Modeling Meetings
Mike Sullivan, P.E. ‐ Deputy State Engineer
James Heath, P.E. ‐ Lead Modeler
November 13 and 14, 2013
Introductions
• Mike Sullivan
• James Heath
Outline
• General Concepts– Rely on these throughout discussion
• Geology 101
• Hydrology 101
• Hydrogeology 101
• Modeling 101
• Additional Discussions
General Concepts
• Soil types and seepage losses
• Ditch loss recharging the aquifer system
• Overview of aquifer system
• Well pumping cones of depression
General Concepts
• Soil types and seepage losses– What are the characteristics of different soil types?
• Gravel
• Sand
• Clay
• Membrane/Bentonite Liner
• Concrete Liner
General Concepts
• Ditch loss recharging the aquifer system– Empire and Monte Vista Canal losses
– Mogote Ditch losses
General Concepts
• Overview of Aquifer System– What is an unconfined aquifer?
– What is a confined aquifer?
General Concepts
General Concepts
General Concepts
• Cones of depression from well pumping– What do cones of depression look like?
– Where does the water come from?
General Concepts
Dewatering of Aquifer Release of Aquifer Pressure
General Concepts
Geology 101
• Formation of the Valley
San LuisHills
Geology 101
Hydrology 101
• How the river systems deposited the different formations of the geology.
San Luis Valley OverviewLooking Northeast
Vertical Exaggeration = 10x
Alamosa
Conejos
Monte Vista
Saguache
Center
Approximate extent of Rio Grande alluvial fan, observed extent ofmeanders and oxbows, and the modern Rio Grande floodplain. (see Madole, R.F., et al, 2008).
Typical sedimentary deposits by braided stream channels (top) and meandering stream channels (bottom). Modified from R. C. Selley, Ancient Sedimentary Environments, figures 2.1, 2.2, 2.13.
Hydrology 101
Hydro‐Geology 101
• Movement of water within the groundwater system of the San Luis Valley
• Groundwater pumping impacts on streams
Hydro‐Geology 101
• Movement of water within the groundwater system of the San Luis Valley
Hydro‐Geology 101
Hydro‐Geology 101
• Groundwater pumping impacts on streams
Hydro‐Geology 101
• What happens when the big confined aquifer wells turn on?
Hydro‐Geology 101
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C.F
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McIntyre Springs Discharge Measurements (1936-2013)
Hydro‐Geology 101
Hydro‐Geology 101
Modeling 101
Q = k I A
Modeling 101
• Modeling process – Part 1
• Modeling data
• Modeling process – Part 2
Modeling 101
• Modeling process – Part 1
HydroBase
MODFLOW
GIS Data (Spatial Data)
TSTool & StateDMI
CDSS Tool Box & StateDGI
StateCU
Modeling 101
• Modeling data
• Irrigated acreage
• Location of wells with metered diversion records
• Diversion structures
• Streamflow gages
• Climate stations
San Luis Valley Cut AwayLooking West
Vertical Exaggeration = 10x
Alamosa
Monte Vista Saguache
Center
Conejos
Modeling 101
Modeling 101
• Modeling process – Part 2
HydroBase
MODFLOW
GIS Data (Spatial Data)
TSTool & StateDMI
CDSS Tool Box & StateDGI
StateCU
Decision Supp
ort P
rocess
RGDSS GROUNDWATER MODEL WORKSHOPJANUARY 10‐12, 2011
PROCESS/DATA FLOW DIAGRAM
HYDROBASE Basic Water Data
Diversions/Structures Water Rights Well Info
Climate Data Irrigated Parcels
AGG Aggregates individual ditches to make the MS and ADW
structures
PRISMPRISM Climate Group, Oregon
State University, http://www.prismclimate.org,
created 4 Feb 2004
Historic Runs
• Steady State: 1990‐1998 • Steady State: Average Monthly • Initial Period: Steady State 1950‐
1969 • Transient: 1970‐2009
STATEPP – Modified for RGDSS
INPUT: StateCU, StateDGI, AGG, and PRISM OUTPUT: MODFLOW Recharge Packages MODFLOW ET Packages MODFLOW Well Packages MODFLOW Drain Packages
SCALE: Model Cell Time Frame: Model Period Time Step: Monthly RUNS: Historic No Pumping Recharge Decrees
General Input FilesNAM File – Names all input files BAS Package ‐ General Setup
BCF Package – Aquifer Parameters DIS Package – Discretization GHB Package – Boundaries
HFB (Horizontal Flow Barrier) Package – Mesita Fault OC Package‐ Output Control
Solver Package
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MODFLOW
Stream PackageMajor Programs
Mkstr: Reads GIS coverage and creates initial network Mkq: Prepares flow files for each stress period Build: Performs data integration MODEx: Produces MODFLOW stream package
GIS DATA (Spatial Data) – ARCVIEW
Ditch Service Areas County, HUC Land Use Aerial & Satellite Imagery Rim Inflow Areas Drains Diversions Model Grid/Layers Climate Stations Soils Stream Gages GW Only Area Boundaries Sprinklers (1975‐98) Wells/Irrigated Lands (1936, 1998, 2002, 2005)
SCALE: Parcel Time Frame: Variable
TSTOOL/STATEDMI
Tools for downloading and enhancing data from HydroBase
User/GIS generated lists provide input files
CDSS TOOL BOX & STATEDGI
INPUT: GIS Files OUTPUT: Canal Length Irrigated acreage by ditch Irrigation wells
Irrigated crop for subirrigation Wells assigned to cells/layers
Small flowing wells assigned to cells Rim Inflow Areas assigned to cells Native Vegetation areas Available Water Content SCALE: Parcel/Structure/Model Cell Time Frame: Snapshots (1936, 1998, 2002, 2005) RUNS: One run for each of the snapshot years
MODFATE Iterative program that estimates fate of surface
water return and drain flows
M&I Well Pumping and Recharge Command Files
Plus Rim Recharge Command File
mksubProgram that builds Subdistrict input
files, one for each Subdistrict
Mkrcdwb: Program that creates 3rd dwb file needed for simulating the recharge decrees
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STATECU PROGRAM
INPUT: RCU file + other files created by DMI’s OUTPUT File (*.DWB):
Canal Losses Non‐Consumed SW & GW Effective Precipitation GW Pumping for irrigation Ditch Shortage of subirrigation
IWR for crop subirrigation SCALE: Ditch /Structure TIME FRAME: Model Period TIME STEP: Monthly RUNS: Historic No Pumping
Subdistrict Response Function Runs
1. No Pumping Run: 1970 ‐2009 (includes recharge decrees ) 2. Historic Response Calibration Data: Transient Historical Run minus No Pumping Run (1970‐2009) 3. Annual Response Functions (1988 – 2009) used to derive calibrated Wet, Dry and Average Year
Response Functions. 4. Wet, Dry and Average year responses are combined and adjusted to “calibrate” to the Historic
Response Calibration Data. 5. Calibrated Wet, Dry and Average year response functions used to estimate future pumping
impacts.
Additional Discussions
• Sustainability
• Drought
• Other?
Sustainability
Subdistrict No.1, Plan of Water Management
Sustainability Objective for Unconfined Storage Levels
Sustainability
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Minim
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Water Dec ‐Mar (Feet)
Water Year
CON 02 Five Year Rolling Avg 78‐00 Min 78‐00 Avg
Drought
Original water table
Without pumping - ground water discharge to stream
With pumping - ground water discharge to stream
Difference in ground water discharge to stream