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Journal article
Evaluating the BANCS streambank erosion framework on the northern Gulf of Mexico coastal plain
Journal of the American Water Resources Association, Vol.53(6), pp.1393-1408
2017
Web of Science ID: WOS:000416910300011
Abstract
The Bank Assessment of Nonpoint source Consequences of Sediment (BANCS) framework allows river scientists to predict annual sediment yield from eroding streambanks within a hydrophysiographic region. BANCS involves field data collection and the calibration of an empirical model incorporating a bank erodibility hazard index (BEHI) and near-bank shear stress (NBS) estimate. Here we evaluate the applicability of BANCS to the northern Gulf of Mexico coastal plain, a region that has not been previously studied in this context. Erosion
rates averaged over two years expressed the highest variability of any existing BANCS study. As a result, four standard BANCS models did not yield statistically significant correlations to measured erosion rates. Modifications to two widely used NBS estimates improved their correlations (r² = 0.31 and r² = 0.33), but further grouping of the data by BEHI weakened these correlations. The high variability in measured erosion rates is partly due to the regional hydrologic and climatic characteristics of the Gulf coastal plains, which include large, infrequent precipitation events. Other sources of variability include variations in bank vegetation and the complex hydro- and morphodynamics of meandering, sand bed channels. We discuss directions for future research in developing a streambank erosion model for this and similar regions.
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Details
- Title
- Evaluating the BANCS streambank erosion framework on the northern Gulf of Mexico coastal plain
- Publication Details
- Journal of the American Water Resources Association, Vol.53(6), pp.1393-1408
- Resource Type
- Journal article
- Publisher
- Wiley-Blackwell Publishing, Inc.; Herndon, Va
- Copyright
- © 2017 American Water Resources Association
- Identifiers
- WOS:000416910300011; 99380090350406600
- Academic Unit
- Earth and Environmental Sciences
- Language
- English