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Scientific Investigations Report 2010–5203


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Prepared in cooperation with the U.S. Fish and Wildlife Service


Use of Acoustic Backscatter and Vertical Velocity to Estimate Concentration and Dynamics of Suspended Solids in Upper Klamath Lake, South-Central Oregon: Implications for Aphanizomenon flos-aquae


By Tamara M. Wood and Jeffrey W. Gartner


Figures

Figure 1. Study area and locations of ADCP moorings, meteorological stations, and water quality monitors, Upper Klamath Lake, south-central Oregon, 2005–06.


Figure 2. Diel patterns in the difference between water temperatures measured near-surface and near-bottom at sites MDN (4.5 m depth), EPT (12.5 m depth), and MDT (14.8 m depth) in Upper Klamath Lake, south-central Oregon.

Figure 3. Daily variations in relative backscatter and water current speed at the five ADCP deployment sites, Upper Klamath Lake, south-central Oregon, 2005.


Figure 4. Profiles of correlation between water current speed and relative backscatter at subseasonal time scales, at five sites where ADCPs were deployed, Upper Klamath Lake, south-central Oregon, 2005.


Figure 5. Profiles of correlation between air temperature and relative backscatter at subseasonal time scales, at five sites where ADCPs were deployed, Upper Klamath Lake, south-central Oregon, 2005.

Figure 6. Seasonally averaged diel patterns in near-surface vertical velocity at five ADCP sites, Upper Klamath Lake, south-central Oregon, 2005.


Figure 7. Depth-averaged (computed) suspended solids concentration (SSC) at five ADCP sites and dissolved oxygen at two water quality sites (MDT and MDN), Upper Klamath Lake, Oregon, June 21– September 12, 2005.

Figure 8.A: water temperature at site MDT, 1 m from surface, and 1 m from bottom; B: Fraction of total water column mass contained in the upper one-third of the water column, fraction of total water column mass contained in the lower two-thirds of the water column at site ADCP1.

Figure 9. Seasonally averaged diel pattern of depth-integrated computed suspended solids concentration (SSC) in the entire water column and in the upper and lower one-half (upper one-third and lower two-thirds at ADCP1) of the water column.

First posted March 16, 2011

For additional information contact:
Director, Oregon Water Science Center
U.S. Geological Survey
2130 SW 5th Avenue
Portland, Oregon 97201
http://or.water.usgs.gov

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