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Influence of Sampling Frequency on Estimation of Annual Total Phosphorus and Total Suspended Solids Loads

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Abstract:  The determination of sediment and nutrient loads is typically based on the collection and analysis of grab samples. The frequency and regularity of traditional sampling may not provide representation of constituent loading, particularly in systems with flashy hydrology. At two sites in the Little Bear River, Utah, continuous, high‐frequency turbidity was used with surrogate relationships to generate estimates of total phosphorus and total suspended solids concentrations, which were paired with discharge to estimate annual loads. The high frequency records were randomly subsampled to represent hourly, daily, weekly, and monthly sampling frequencies and to examine the effects of timing, and resulting annual load estimates were compared to the reference loads. Higher frequency sampling resulted in load estimates that better approximated the reference loads. The degree of bias was greater at the more hydrologically responsive site in the upper watershed, which required a higher sampling frequency than the lower watershed site to achieve the same level of accuracy in estimating the reference load. The hour of day and day of week of sampling impacted load estimation, depending on site and hydrologic conditions. The effects of sampling frequency on the determination of compliance with a water quality criterion were also examined. These techniques can be helpful in determining necessary sampling frequency to meet the objectives of a water quality monitoring program.
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Document Type: Research Article

Affiliations: 1: Respectively, Research Engineer (Jones), Research Assistant Professor (Horsburgh), Professor (Stevens), Utah Water Research Laboratory, Utah State University, 8200 Old Main Hill, Logan, Utah 84322-8200 2: Associate Dean (Mesner), College of Natural Resources, Associate Professor (Ryel), Department of Wildland Resources, College of Natural Resources, Utah State University, Logan, Utah 84322-5200

Publication date: 2012-12-01

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