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Field Based Data Loggers for Inundation Indeterminacy and Floodplain Connectivity on Small Urban Streams

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Co-Author

Jennifer Avila

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Co-Author

Emma Leppard

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Advisor

Dr.Inci Guneralp

Hydrologic and geomorphic connectivity in stream-floodplain systems can influence the height associated with overbank flow, sediment transportation capacities, and the intermittency of inundation. Small streams are the first to experience flood conditions during storm events and monitoring these types of dynamics is critical with regard to river hazards and ecological health. This study examines the hydrologic connectivity between a small urban stream and its floodplain within the urban areas of College Station, Texas. Field-based data loggers are used to monitor inundation intermittency and water quality by deploying sets of loggers on transect lines that encompass the main channel and floodplain. Loggers are placed along stream reaches with varying channel-bank heights and in locations where the main channel connects to surrounding wetlands. In particular, the loggers record temperature, electrical conductivity, and luminosity at 15-minute intervals that can be used to infer hydrologic and geomorphic connectivity. Data logger readings are also informed by streamflow and precipitation records from two USGS gaging stations that provide more information on hydrologic conditions. This work reveals the localized differences in inundation that can occur when channel bank heights differ on either side of the channel. Moreover, it reveals how water quality can vary with regard to the size of the riparian buffer and the urban intensity associated with the stream’s course. By analyzing a small urban stream’s inundation intermittency and fluvial connectivity, it can inform efforts to conserve the ecological health of wetlands in the riparian zone while also reducing exposure to flood hazards.

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