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Sand Mass Trends at Great Basin CSCs, ‘00-’05 Owens Lake Dust Mitigation Project

Sand Mass Trends at Great Basin CSCs, ‘00-’05 Owens Lake Dust Mitigation Project. Bishop, September 28-29 2005. Los Angeles Department of Water & Power CH2M HILL and Air Sciences. Goal of Analysis

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Sand Mass Trends at Great Basin CSCs, ‘00-’05 Owens Lake Dust Mitigation Project

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  1. Sand Mass Trends at Great Basin CSCs, ‘00-’05 Owens Lake Dust Mitigation Project Bishop, September 28-29 2005 Los Angeles Department of Water & Power CH2M HILL and Air Sciences

  2. Goal of Analysis To examine spatial and temporal trends in the District sand mass collections, in light of construction activities on the lake bed

  3. Data Data provided by District, Jan 2000-July 2005 Data summarized by year & month CSC locations categorized by location and/or control status

  4. Factors Considered Meteorology Dust Control Measures (DCMs) Construction activities

  5. Meteorology Windspeed Precipitation Temperature & Relative humidity

  6. Meteorology: Results Wind speed in ’00-’05 similar to long term trend Wind speed similar during all construction phases Precipitation variable by year Temperature and relative humidity similar to long term trend

  7. Base Map

  8. Construction Periods Pre-construction 1/00-10/00 NSS construction 11/00-12/01 Managed Vegetation 1/02-8/02 Phase 2 shallow flood 9/02-4/03 Interim (no activity) 5/03-8/03 Phase 3 construction 9/03-9/04 Phase 4 shallow flood 10/04-7/05

  9. Analysis of Sand Mass Trends Two levels of Analysis: Trends by CSC category Trends by individual CSCs

  10. Sand Mass Trends by Category High throughout entire period Shallow Flood Phase 4 and 5 Keeler Dunes High initially, decrease with DCMs NSS Zone 2 Managed Vegetation Shallow flood Phase 2

  11. Sand Mass Trends by Category High initially, construction increase NSS Zone 1 Low initially, construction increase 2002-2004 SCA

  12. Results by CSC Group Analysis indicates increased sand mass over time due to construction activities However, trends in sand mass are unique on a CSC by CSC basis

  13. Construction Evidence by CSC Distance to construction activity Timing of construction activity Wind speed and precipitation

  14. Results Map

  15. Results: By individual CSCs Evidence Category# Cells% Unlikely, low sand mass 16 12 Unlikely, high sand mass 39 28 Inconclusive 29 21 Possible evidence 10 7 Strong evidence 44 32 Total 138

  16. Results: ’02-’04 SCA Cells only Evidence Category# Cells% Inconclusive 5 15 Possible evidence 7 20 Strong evidence 21 65 Total 33

  17. Sand mass affected by: Meteorology: No DCM: Yes Construction: Yes

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