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Final BMP Modeling Workshop September 29, 2011 UB Geography Department Sponsored by the Buffalo District of the US Army Corps of Engineers.
Final BMPModeling Workshop
September 29, 2011
UB Geography Department
Sponsored by the Buffalo District of the
US Army Corps of Engineers.
Workshop Outline
• Intro to Baseline Models & Case Studies• Overview of BMPs by Scale• Large-Scale Watershed Models (ArcSWAT)• Break• Small –Scale Hillslope BMPs (WEPP)• Lunch
Workshop Outline
• Medium-Scale Watershed BMPs (GeoWEPP)• Break• Modeling Flood Levels & BMPs (HEC-GeoRAS)• Break• Instructor Assisted Self-Paced Exercises• Wrap-up & Closing Comments
Workshop Outline
• Intro to Baseline Models & Case Studies• Overview of BMPs by Scale• Large-Scale Watershed Models (ArcSWAT)• Break• Small –Scale Hillslope BMPs (WEPP)• Lunch
What Have We Done?
• Engaged with Stakeholders• Acquired / modified / refined / verified required data
– DEM, soils, landuse, cross section profiles• Developed verifiable baseline models (Catt Creek and Clear Creek)• Conducted field trips and workshops for two-way knowledge transfer• Delineated watershed and stream networks to maximize sub-basins <
5 sq km• Chose BMPs to simulate• Chose modeling software to match basin size and BMPs to simulate• Selected sub-basins to model• Tested modeling software inputs or parameters to simulate BMPs• Evaluated model results
Baseline Models & Case Studies
What’s Next To Do?
• Conduct BMP Modeling Training Workshop (today)
• Continue to engage with Stakeholders• Acquire / modify / refine / verify required data– DEM, soils, landuse, cross section profiles
• Continue two-way knowledge transfer• Incorporate lessons learned in classroom setting• Develop and deliver a final written report
Baseline Models & Case Studies
What Else Have We Done?
• Refined the Erie County LiDAR data to recalculate bank erosion volumes compared to IPLER/RIT LiDAR.
Baseline Models & Case Studies
What Else Have We Done?
Baseline Models & Case Studies
Black = Strong ReturnsWhite = No Returns
What Else Have We Done?
Baseline Models & Case Studies
Red = ErosionYellow = NeutralGreen = Deposition
Workshop Outline
• Intro to Baseline Models & Case Studies• Overview of BMPs by Scale• Large-Scale Watershed Models (ArcSWAT)• Break• Small –Scale Hillslope BMPs (WEPP)• Lunch
10,000 yrs
1,000 yrs
1 yr
1 mon
1 day
1 hr
1 min
Log time years
Log space km
10,000 km2
100 km2
1 km2
1 ha100 m2
1 cm2
420-2-4-6
-6
watershed
1 dm2 micro
plot
hill- slopesub-shed
basin
Weather / Climate Vegetation Management UnitSoil / Lithology Erosion Process Topographic Scale
1 m2
100 yrs
10 yrs
1MM km2
globe
-4
-2
0
2
4
-8
1 sec
Natural Variability & Role of Scale
splash
woodstand
canopy
buffer
grass
front
thunderstorm
breeze
long waves El Niño
interrill
rill
gully
fluvial
infiltration / moisture structure texture
depthtillage ridgehorticulture
orchard
forest
landscape evolution
catenacrop
climate change
BMPs by Scale
John Whitney’s most important agricultural BMPs on WNY farms:• Crop Rotation• Conservation Tillage• Nutrient Management• Pest Management• Buffers
Other supporting practices include:• Cover Crops (often part of the Conservation Tillage/Residue Management
package) but also important for organic matter improvements• Waste Management• Contour Farming• Strip Cropping
BMPs by Scale
Cover Crop Rotation Patterns
BMPs by Scale
Cover Crop Options
BMPs by Scale
Scale Dependent Model Simulations
• Models can only “see”/represent features larger than the basemap grid cell size
• Historic DEM cell sizes range from 90 m to 10 m, but most current USGS DEM areas are 30 m or 10 m grid cell sizes
• Models often aggregate landuse, soil, slope for the entire sub-basin to the DEM grid spatial reference and resolution
• BMPs which involve small changes like riparian grass buffers can be modeled without a spatial reference
1. WEPP models hillslopes (representative and real)2. GeoWEPP models small sub-basins (< 5 km2)3. ArcSWAT models for larger watershed (> 5 km2)4. HEC-GeoRAS models single channels and overbank area
Model Scale Dependencies
WEPP Hillslope Interface
Model Scale Dependencies
Watershed vs. Flowpath Method• Watershed – aka offsite assessment– Measures sediment yield at the outlet point– Less memory intensive– Take less time– Identifies problem hillslopes– Uses Dominant Soil and Dominant Landuse
• Flowpath – aka onsite assessment– Measures soil loss at each raster cell– Memory hog– Can take some time– Identifies problem areas within a hillslope– Uses Soil and Landuse of each cell
Model Scale Dependencies
Method ComparisonWatershedFlowpath
Model Scale Dependencies
Watershed vs. Flowpath Methods
Watershed
Flowpath
Model Scale Dependencies
Short-term & Long-Term Processes
• Short-term:– Single storm events which demonstrate watershed responses
to baseline conditions coupled with localized weather patterns– 5-year window (event year plus 2 yrs before and after)
• Long-term:– Statistically defined weather conditions based on historic
patterns which operate over much longer periods– 50-100 year window (models daily/hourly averages over time)– Allows return periods to be computed (100-yr, 500-yr, 1000-yr
storms and floods).
Workshop Outline
• Intro to Baseline Models & Case Studies• Overview of BMPs by Scale• Large-Scale Watershed Models (ArcSWAT)• Break• Small –Scale Hillslope BMPs (WEPP)• Lunch
Workshop Outline
• Intro to Baseline Models & Case Studies• Overview of BMPs by Scale• Large-Scale Watershed Models (ArcSWAT)• Break• Small –Scale Hillslope BMPs (WEPP)• Lunch
Workshop Outline
• Intro to Baseline Models & Case Studies• Overview of BMPs by Scale• Large-Scale Watershed Models (ArcSWAT)• Break• Small –Scale Hillslope BMPs (WEPP)• Lunch
Workshop Outline
• Intro to Baseline Models & Case Studies• Overview of BMPs by Scale• Large-Scale Watershed Models (ArcSWAT)• Break• Small –Scale Hillslope BMPs (WEPP)• Lunch
Workshop Outline
• Medium-Scale Watershed BMPs (GeoWEPP)• Break• Modeling Flood Levels & BMPs (HEC-GeoRAS)• Break• Instructor Assisted Self-Paced Exercises• Wrap-up & Closing Comments
Workshop Outline
• Medium-Scale Watershed BMPs (GeoWEPP)• Break• Modeling Flood Levels & BMPs (HEC-GeoRAS)• Break• Instructor Assisted Self-Paced Exercises• Wrap-up & Closing Comments
Workshop Outline
• Medium-Scale Watershed BMPs (GeoWEPP)• Break• Modeling Flood Levels & BMPs (HEC-GeoRAS)• Break• Instructor Assisted Self-Paced Exercises• Wrap-up & Closing Comments
Workshop Outline
• Medium-Scale Watershed BMPs (GeoWEPP)• Break• Modeling Flood Levels & BMPs (HEC-GeoRAS)• Break• Instructor Assisted Self-Paced Exercises• Wrap-up & Closing Comments
Workshop Outline
• Medium-Scale Watershed BMPs (GeoWEPP)• Break• Modeling Flood Levels & BMPs (HEC-GeoRAS)• Break• Instructor Assisted Self-Paced Exercises• Wrap-up & Closing Comments
Workshop Outline
• Medium-Scale Watershed BMPs (GeoWEPP)• Break• Modeling Flood Levels & BMPs (HEC-GeoRAS)• Break• Instructor Assisted Self-Paced Exercises• Wrap-up & Closing Comments
What Have We Done?
• Engaged with Stakeholders• Acquired / modified / refined / verified required data
– DEM, soils, landuse, cross section profiles• Developed verifiable baseline models (Catt Creek and Clear Creek)• Conducted field trips and workshops for two-way knowledge transfer• Delineated watershed and stream networks to maximize sub-basins <
5 sq km• Chose BMPs to simulate• Chose modeling software to match basin size and BMPs to simulate• Selected sub-basins to model• Tested modeling software inputs or parameters to simulate BMPs• Evaluated model results
Wrap-up & Closing Remarks
What’s Next To Do?
• Conduct BMP Modeling Training Workshop (today)
• Continue to engage with Stakeholders• Acquire / modify / refine / verify required data– DEM, soils, landuse, cross section profiles
• Continue two-way knowledge transfer• Incorporate lessons learned in classroom setting• Develop and deliver a final written report
Wrap-up & Closing Remarks
