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Development and Demonstration of a Free Surface Flow‐Dependent Sampling Technology
Author(s) -
Daas Mutaz,
Srivastava Rajiv,
Retnaswamy Ashok
Publication year - 2008
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143007x184654
Subject(s) - sampling (signal processing) , environmental science , channel (broadcasting) , water quality , flow (mathematics) , hydrology (agriculture) , surface water , sample (material) , environmental engineering , sensitivity (control systems) , engineering , mathematics , geotechnical engineering , chemistry , telecommunications , chromatography , ecology , geometry , detector , biology , electronic engineering
Statistical assessment of water quality data, obtained at the South Florida Water Management District (West Palm Beach, Florida) S‐65E structure, illustrated significant differences and inconsistency in nutrient concentrations (Daas and Ebadian, 2003). The evaluation showed that currently used water sampling techniques are inadequate because of deficiencies in functionality and sensitivity to flow conditions at the structure. Moreover, the study indicated the need for a more precise sampling technology, which would consider variations in the velocity profile across the water column during the sampling process.
Therefore, a new prototype sampling technology was designed and tested in a pilot open channel. The new sampler had the capability to collect discrete aliquot volumes of water samples that are proportional to the corresponding point velocity at each of these depths. The discrete aliquot volumes were blended to provide an integrated sample that captures the variations in the velocity profile.