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Analysis of TSS Data Patterns in VA Mainstem Stations: Methodological Insights and Variances

This report investigates the discrepancies in Total Suspended Solids (TSS) concentrations across various VA mainstem stations, particularly focusing on data from 1996 onwards. It highlights inconsistencies in measurement techniques between ODU and VIMS sampling protocols, revealing variations in results depending on sampling depth and station location. The report also considers external factors such as river flow and the onset of drought years starting in 1999. Suggestions for further examination of methodologies and data comparisons are provided to enhance understanding and accuracy.

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Analysis of TSS Data Patterns in VA Mainstem Stations: Methodological Insights and Variances

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  1. TSS Issue in VA Mainstem Stations Rick Hoffman AMQAW 9/21/2007

  2. 1/1/1996 Data Pattern Changes Surface TSS Concentration ODU Sampling (14 Cruises/year) VIMS Sampling (18 Cruises/Year) Doesn’t seem consistent across stations or coincident with sampling organization change

  3. Station CB7.1N 1/1/1996 1/1/1996 Surface Bottom Doesn’t seem consistent across depths within some stations

  4. Station LE3.7 1/1/1996 1/1/1996 Surface Bottom Doesn’t seem consistent across depths within some stations

  5. 1/1/1996 Possibly Involves Riverflow Begin of “Drought” years (1/1/1999) Rappahannock Riverflow

  6. Need to Examine further for Methodological Effects • Examine Protocols • Filters? Volume filtered? • Vacuum pressure? • Pump/hose? • Examine Data • CSSP (Information or data), pre 1996 only • CB5.3 CBL/VIMS “Overlap” station • Consistency (is lab X un-usually inconsistent in comparison to other labs or stations) • TP/TSS Ratio? Secchi/TSS ratio? • Relation to Flow?

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