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The recent changes in water levels and sediment dynamics in the Henry’s Fork and Thurmon Creek have garnered significant attention from environmental scientists and enthusiasts. This article explores the turbidity and suspended sediment data collected following the drawdown of Silver Lake in November. The analysis aims to clarify the complexities of suspended load calculations and highlight the potential contributions of bed load transport in these vital waterways.
Understanding turbidity and suspended sediments
Following the Silver Lake drawdown, a noticeable increase in turbidity was recorded downstream in both Thurmon Creek and Henry’s Fork. This surge in sediment concentrations prompted the Henry’s Fork Foundation (HFF) to mobilize its Science and Technology team to investigate the phenomenon. The team initiated a comprehensive study to collect samples and document the environmental conditions during this critical period.
Data collection and analysis
The HFF team conducted extensive fieldwork to gather data on water quality and sediment transport. Samples were meticulously collected from various locations, facilitating a detailed examination of suspended sediment levels and turbidity measurements. By analyzing these samples, the team aimed to quantify the sediment transported through the waterways and assess its implications for aquatic ecosystems.
Implications of increased bed load transport
While much attention has focused on suspended sediment, it is essential to consider the role of bed load transport. Conditions following the Silver Lake drawdown suggest that a significant volume of sediment may have been mobilized from the riverbed and transported downstream into Henry’s Fork. This could have extensive effects on habitat and water quality within the river system.
Why bed load matters
Bed load refers to the portion of sediment that moves along the riverbed, typically consisting of larger particles that are not suspended in the water column. Understanding the dynamics of bed load transport is crucial, as it influences overall river morphology and can impact fish habitats, particularly for species like trout that thrive in specific environmental conditions. The potential for increased erosion and habitat alteration raises concerns for ongoing conservation efforts in the region.
As the Henry’s Fork Drought Management Planning Committee convenes to establish outflow strategies for the winter months, these findings will significantly influence decisions affecting aquatic life in Box Canyon and the Ranch. Starting December 1, the outflow from Island Park Dam will increase to approximately 380 cubic feet per second (cfs) for the winter months, representing a substantial portion of streamflow in the area.
The interplay between turbidity, suspended load, and bed load transport underscores the need for ongoing monitoring and research in the Henry’s Fork and Thurmon Creek. Understanding these dynamics reveals the interconnected nature of our water systems and emphasizes the importance of safeguarding them for future generations.