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Conference proceeding
Assessment Of Streambank Erosion Rate Prediction In Northwest Florida, USA
Proceedings of the 39th IAHR World Congress
International Association for Hydro-Environmental Engineering and Research World Congress, 39th (Granada, Spain, 2022)
12/2022
Abstract
In response to increased awareness of the negative impacts of fluvial erosion on natural resources and infrastructure, efforts to understand channel sediment sources have increased so cost-effective mitigation may be achieved. Attempts to quantify the important contribution of streambank erosion to channel sediment loading have been made with modeling and in-situ measurement approaches. Many of these efforts involve time-consuming or technologically advanced techniques while practitioners often need a reliable and rapid assessment method to quantify local streambank erosion. One such method, the Bank Assessment of Non-Point Source Consequences of Sediment (BANCS) model, predicts average annual streambank erosion from field estimates of near-bank stress (NBS) and bank erodibility (BEHI) and observed erosion rates resulting from bankfull events. The model provides a means to contextually transpose observed erosion rates of streambanks to predict erosion rates of other local streambanks with similar characteristics. Given the empirical nature of BANCS, its BEHI category-based predictive models have to be established for every physiographic region to account for local environmental controls. Our study examined the applicability of the BANCS model to an area along the north coast of the Gulf of Mexico dominated by sandy soils and a warm and wet climate with frequent high-intensity precipitation events. Bank erosion incurred at 18 study sites located in 10 different stream reaches was monitored for one year and morphometric variables were recorded. Bankfull flow events, which are the critical erosion-causing events in the BANCS model, were identified through the use of constructed stage gages. Bank erosion associated with individual bankfull events was between 0.01 m and 0.12 m, but some sites experienced more than one bankfull event and some reached flood stage. The mean total annual erosion rate for all study sites was 0.054 m/yr. Based on the BANCS model, total annual erosion rates showed moderate to strong relationships with NBS for High and Very High BEHI categories. As the values for BEHI and NBS increased between sites, so did the measured erosion rates. During this study, BEHI appeared a stronger predictor of bank erosion than NBS and further evaluation of the application of the various NBS methods is needed for the study area.
Details
- Title
- Assessment Of Streambank Erosion Rate Prediction In Northwest Florida, USA
- Publication Details
- Proceedings of the 39th IAHR World Congress
- Resource Type
- Conference proceeding
- Conference
- International Association for Hydro-Environmental Engineering and Research World Congress, 39th (Granada, Spain, 2022)
- Publisher
- International Association for Hydro-Environment Engineering and Research (IAHR)
- Copyright
- Copyright: @2022 IAHR
- Identifiers
- 99380489697106600
- Academic Unit
- Hal Marcus College of Science and Engineering ; Earth and Environmental Sciences
- Language
- English