PHASE 1 STUDIES UPDATE EROSION WORKING GROUP
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1 PHASE 1 STUDIES UPDATE EROSION WORKING GROUP Presented By MICHAEL WOLFF, PG Erosion Study Area Manager West Valley Demonstration Project Quarterly Public Meeting February 24, 2016
2 OUTLINE Study 1 Terrain Analysis, Age Dating, and Paleoclimate Study 2 Recent Erosion and Deposition Processes Study 3 Preliminary Erosion Modeling Next Steps Questions
3 Study 1 Terrain Analysis, Age Dating, and Paleoclimate TASKS: Task 1.1: Mapping - completed Summer 2015 Task 1.2: Field Reconnaissance - started Fall 2015 Task 1.3: Site Prioritization - ongoing Task 1.4: Site Walkover - started Fall 2015 Task 1.5: Site Sampling - started Fall 2015 Task 1.6: Sample Preparation and Selection for Dating - started Task 1.7: Sample Age Analysis, Geologic Interpretation -started
4 STUDY 1 -Terrain Analysis, Age Dating, and Paleoclimate Task 1.2: Reconnaissance data gathering October 2015 abandoned meander LiDAR Image (Airborne laser scanning) Heinz Creek Terraces WVDP 4
5 STUDY 1 -Terrain Analysis, Age Dating, and Paleoclimate Task 1.2: Reconnaissance data gathering October 2015 Documenting shallow soils and pebble composition, sizes, and shapes on high-level Buttermilk Creek terraces Topsoil Sand 5
6 STUDY 1 -Terrain Analysis, Age Dating, and Paleoclimate Task 1.5: Sampling mid October 2015 Dr. Wilson collecting a tree core to determine age of growth on low terrace surfaces Location low terrace near Buttermilk Creek/Heinz Creek confluence Purposes: - Oldest trees suspected to be yrs old - Demonstrates stability of low terraces during human-caused deforestation period - Provides recent (2-3 centuries) paleoclimate information 6 - Aids Study 2
7 STUDY 1 -Terrain Analysis, Age Dating, and Paleoclimate Collection of tree cores to determine age of oldest growth on low terrace surfaces helps to determine: Length of time low stream terraces have been relatively stable (trees can grow), Relative paleoclimate factors during this period, 7
8 STUDY 1 -Terrain Analysis, Age Dating, and Paleoclimate Task 1.5: Ground Penetrating Radar (GPR) Surveys November 2015 GPR survey: Is a rapid, non-invasive geophysical technique for providing information on subsurface layering and locations of anomalies; Enables locations of trenches for age dating sample collection to be optimized Enables targeting of specific subsurface features of interest Sand and gravel Glacial till 8
9 STUDY 1 -Terrain Analysis, Age Dating, and Paleoclimate Task 1.5:Sampling for Age Dating November 2015 Fluvial sediment Glacial till Buried log found in stream bank suitable for carbon dating Soil coring tool inserted horizontally in trench wall for collecting a sample for age dating
10 STUDY 1 -Terrain Analysis, Age Dating, and Paleoclimate Task 1.5:Sampling for Age Dating November 2015 Trench excavation in progress (location chosen with assistance of GPR survey) Trench covered by tarps to enable optically stimulated luminescence (OSL) sampling under low light conditions* * Avoiding exposure of samples to ambient light is critical in OSL sampling. For this type of sampling, the sampler will enter the trench below the tarp cover, and work in darkness using only a red light for illumination. 10
11 STUDY 2 -Recent Erosion and Deposition Processes TASKS: Identify and Confirm Analogue Gullies Outside Area of Radiological Controls Task 2.1: Quantify Rainfall Rates and Snow Depth Task 2.2: Quantify Infiltration Capacity or Rate and Soil Moisture for all Surficial Materials Task 2.3: Quantify the Flow Rates and Total Suspended Solids in Select Gullies Task 2.4: Quantify the Flow Rates and Total Suspended Solids at Select Stream Locations Task 2.5: Quantify the Erodibility of the Surficial Materials Task 2.6: Quantify the Entrainment Thresholds for all Bed and Bank Materials within Select Gullies and Stream Channels Task 2.7: Quantify the Topographic Characteristics of Select Gullies Task 2.8: Reports
12 STUDY 2 -Recent Erosion and Deposition Processes TASKS: Identify and Confirm Analogue Gullies Outside Area of Radiological Controls Compile digital database of morphometric signatures of all site gullies of concern Using the gully signatures, identify equivalent or analogue gullies outside area of radiological controls Perform field inspections to confirm equivalence of analogue gullies to site gullies
13 STUDY 2 -Recent Erosion and Deposition Processes NP-1 Gully Elevation (m) average inner slope: average slope: Gully 1 (NP-1) Gully Dimension (m) Width Depth width exponent: Relative Distance (m) depth exponent: Relative Distance (m) Gully 1 (NP-1) Slope map Inner Gully Outer Gully
14 STUDY 2 -Recent Erosion and Deposition Processes NP-2 Gully Elevation (m) Gully Dimension (m) Relative Distance (m) Gully 3 (NP-2) Width Depth average inner slope: depth exponent: average slope: width exponent: Relative Distance (m) Slope map Inner Gully Outer Gully Gully 3 (NP-2)
15 STUDY 3 Preliminary Erosion Modeling TASKS: Task 3.1: New Data Collection Support and Evaluation Task 3.2: Preparatory Work for Model Selection and Component Testing Task 3.3: Design Model Calibration and Testing Strategy Task 3.4: Select, Extract, and Analyze Topographic Metrics Task 3.5: Generate Model Grids Task 3.6: Design Strategy and Select Site for Model Validation Task 3.7: Report Progress to Agencies and Stakeholders Task 3.8: Identify, Obtain, and Become Familiar with Computing Resources Task 3.9: Create Preliminary Design for Future Erosion Projection Task 3.10: Compile and Analyze New Available Climate/Hydrology Data and Define Parameter Ranges
16 STUDY 3 Preliminary Erosion Modeling Task Preparatory Work for Model Selection and Component Testing A primary objective is to reduce uncertainty in erosion projections First, we need to understand and quantify degree of uncertainty in previous projections Developed code to extract and statistically analyze data used in FEIS modeling Completed quality assurance assessment of the methodology Will complete uncertainty evaluation after selecting model parameters for Phase 1 Studies erosion projections
17 STUDY 3 Preliminary Erosion Modeling Task Preparatory Work for Model Selection and Component Testing Assessed modeling improvements published since FEIS modeling (8-10 years ago) Started developing code using most useful and computationallyefficient models currently available Developed a code structure that can readily incorporate external data such as digital topography data, etc.
18 STUDY 3 Preliminary Erosion Modeling Task 3.5 Generate Model Grids Developed and documented workflows to produce model grids from LiDAR Created grids for two areas: (1) Buttermilk Creek watershed, and (2) Site watershed (Franks Creek, and tributaries Erdman Brook, Quarry Creek, and Dutch Creek) Created grids at five resolutions: 3, 6, 12, 24, and 48 feet Completed quality control evaluation for input of grids into erosion-modeling software
19 STUDY 3 Preliminary Erosion Modeling Shaded relief image of Franks Creek watershed digital elevation model (6-foot resolution) (image width approximately 1.8 miles) Dutch Creek N WVDP (approx.)
20 STUDY 3 Preliminary Erosion Modeling Oblique view, looking toward the southwest WVDP (approx.)
21 NEXT STEPS Study 1 - Resume Field Data Collection When Weather Permits Study 2 Identify Analogue Gullies, Install Instrumentation, and Collect Field Data Study 3 Continue Building and Testing Model(s), Refine Models as Data from Studies 1 and 2 are Gathered and Validated 21
22 QUESTIONS? 22
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