Dry Spells and Dirt Roads: Hidden Drivers of Water Quality | Dr. Shannon Speir

Описание: Welcome back to WaterWorks! In this month's talk, discover how flow variability and intermittency in streams affect the timing and delivery of nutrients and sediments to downstream waters. Dr. Shannon Speir from the University of Arkansas examines how these hydrological changes exacerbate water quality issues in agricultural landscapes.

This presentation focuses on non-perennial headwater streams, which serve as key sites for nutrient and sediment transport and processing. Through a case study of the Brush Creek watershed, a non-perennial tributary of Beaver Lake Reservoir serving as the primary drinking water source for Northwest Arkansas, Dr. Speir reveals findings from monthly baseflow and storm sampling examining how stream intermittency, agriculture and unpaved road networks influence nutrient and sediment export patterns.

Key Topics:
How flow variability and stream intermittency affect nutrient and sediment delivery
Non-perennial headwater streams as nutrient and sediment transport sites
Monthly baseflow and storm sampling methodology in Brush Creek watershed
Different responses of nitrate and phosphorus to hydrologic connectivity changes
Unpaved roads and stream crossings as sediment sources
Interactions between intermittency, agricultural land use and rural infrastructure
Watershed management implications for regions facing increased stream intermittency

⏱️ Key Moments:
0:00 - Opening & Introduction
0:04 - Dr. Speir introduces herself and her research focus
0:54 - Talk overview: Nutrients and unpaved roads in agricultural watersheds
1:11 - Research goals: Applied work for watershed management
2:01 - Talk title: Dry Spells and Dirt Roads
2:16 - Acknowledgments and funding
3:06 - Headwater streams: Why they matter
5:25 - Stream intermittency explained
8:26 - Brush Creek watershed study site overview
11:36 - Nutrient sampling methodology
14:45 - Nitrate and phosphorus patterns across the watershed
18:52 - How stream intermittency affects nutrient concentrations
22:14 - Unpaved roads study introduction
24:37 - Road crossing types and sediment transport
27:48 - Storm event sediment loss findings
31:00 - Key findings: Road crossings and sediment yields
32:13 - Resilient infrastructure and future considerations
33:14 - The bigger picture: Beaver Lake water quality
34:01 - Conclusion and PhD student recruitment announcement

About the Speaker:
Dr. Shannon Speir is the assistant professor of water quality in the Department of Crop, Soil and Environmental Sciences at the University of Arkansas. She is a stream ecologist, whose work explores stream ecosystem function and nutrient transformations in both human- and climate-impacted freshwater systems. The driving mission behind the Speir Lab's work is to conduct water quality research in partnership with the broader community of landowners, stakeholders, and government entities to ensure both water quality goals and community-based needs are met. Her lab combines both field and laboratory studies, as well as the use of high-frequency sensors, to determine the mechanisms driving biogeochemical transformations and nutrient transport in agricultural, intermittent, urban, and Arctic streams. Additionally, the Speir Lab's research is grounded in translational ecology, in which our findings have real world impacts on conservation and restoration efforts and water quality policy.

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📍 Presented By:
The University of Alabama
Alabama Water Institute

#WaterScience #Hydrology