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Overview
Basics
Basics
Create a uniform, consistent and inter-comparable data base that includes all available data on particle size distribution and composition for Lake Tahoe’s streams, urban runoff, the atmosphere and for the lake itself.
Completed
2007
2007
2011
$209,196
Alan Heyvaert (alan.heyvaert@dri.edu)
09/20/2017
09/20/2017
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| Location Information | Location Notes |
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Organizations
EIP Details
EIP Basics
EIP Basics
04.01.01.0044 - P014: Assessment of Particle Size Analysis in the Lake Tahoe Basin
Performance Measures
Expected Performance Measures
Expected Performance Measures
No expected performance measures set for this project.
Reported Performance Measures
Reported Performance Measures
No annual performance measure accomplishments entered for this project.
Funding
Expected Funding
Expected Funding
$209,196
$209,196
$0
| Total | |||
|---|---|---|---|
| Unknown or Unassigned | $209,196 | $209,196 | $0 |
| Grand Total | $209,196 | $209,196 | $0 |
Reported Expenditures
Reported Expenditures
| Total | 2011 | 2010 | 2009 | 2008 | 2007 | |
|---|---|---|---|---|---|---|
| Southern Nevada Public Land Management Act (Pacifi... | $209,196 | $41,840 | $41,839 | $41,839 | $41,839 | $41,839 |
| Grand Total | $209,196 | $41,840 | $41,839 | $41,839 | $41,839 | $41,839 |
Photos
Other Details
Watersheds
No watersheds set for this project.
Threshold Categories
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Water clarity in Lake Tahoe has been decreasing at the rate of about 1 foot per year for several decades. As a consequence, measurement of particle size distribution (PSD) and particle counts are exceptionally important in the evaluation of water quality samples collected from the lake, from stream discharge, urban runoff and the atmosphere.
Local and Regional Plans
No Local and Regional Plans set for this project.
Related Projects
Related Projects
No Related Projects set for this project.
External Links
No external links entered.
Notes
Notes
| 08/12/2017 6:07 PM | System | Objectives: The main goal of this project was to assemble and analyze available data on particle size characterization reported for samples taken from Lake Tahoe, from Tahoe Basin streams, and from Tahoe area urban runoff. Additional objectives included: • Conducting a set of comparative tests on the methods currently in use for particle size distribution (PSD) analysis • Preliminary investigation on the use of surrogate measurements to complement or replace the explicit measurement of PSD • Developing guidance for standardized analysis and reporting of new data by various groups. |
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| 08/12/2017 6:06 PM | System | Findings: • Lake concentrations tended to be highest in the upper water column above the Secchi depth and declined below the deep chlorophyll maximum. Spring and early summer particle concentrations increased, coinciding with snowmelt, and then decreased in late autumn and early winter, especially during periods of lake turnover. Annual average stream concentrations showed variable relative differences between sites and years, although relative ranks based on annual average flux were more consistent. Both concentrations and flux were lowest during dry years and highest during peak wet years. • Fine sediment particle (FSP) concentrations in stormwater samples were generally several orders of magnitude greater than the fine particle concentrations in lake and steam samples. • Changes in PSD associated with holding times for stormwater samples were evident within a single day, tending toward increasing particle size, a process that continued with increased holding times. |
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| 08/12/2017 6:05 PM | System | Management Implications: Water clarity in Lake Tahoe has been declining for several decades. Much of this clarity loss has been caused by increased input and accumulation of fine particulates (<16 µm in diameter) in the lake. Therefore, accurate methods for analysis of fine particle concentrations and particle size distributions in water samples from the lake, streams, and urban runoff are of major importance. It is intended that these methods be employed to improve management control of fine sediments. |
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| 08/12/2017 6:05 PM | System | Publications: www.fs.fed.us/PSW/partnerships/tahoescience |