Inicio  /  Water  /  Vol: 9 Par: 8 (2017)  /  Artículo
ARTÍCULO
TITULO

Watershed Variability in Streambank Erodibility and Implications for Erosion Prediction

Holly K. Enlow    
Garey A. Fox and Lucie Guertault    

Resumen

Two fluvial erosion models are commonly used to simulate the erosion rate of cohesive soils: the empirical excess shear stress model and the mechanistic Wilson model. Both models include two soil parameters, the critical shear stress (tc) and the erodibility coefficient (kd) for the excess shear stress model and b0 and b1 for the Wilson model. Jet erosion tests (JETs) allow for in-situ determination of these parameters. JETs were completed at numerous sites along two streams in each the Illinois River and Fort Cobb Reservoir watersheds. The objectives were to use JET results from these streambank tests to investigate variability of erodibility parameters on the watershed scale and investigate longitudinal trends in streambank erodibility. The research also determined the impact of this variability on lateral retreat predicted by a process-based model using both the excess shear stress model and the Wilson model. Parameters derived from JETs were incorporated into a one-dimensional process-based model to simulate bank retreat for one stream in each watershed. Erodibility parameters varied by two to five and one to two orders of magnitude in the Illinois River watershed and Fort Cobb Reservoir watershed, respectively. Less variation was observed in predicted retreat by a process-based model compared to the input erodibility parameters. Uncalibrated erodibility parameters and simplified applied shear stress estimates failed to match observed lateral retreats suggesting the need for model calibration and/or advanced flow modeling.

 Artículos similares

       
 
Feng Zhou, Wanshun Zhang, Xin Liu, Anna Jiang, Gang Chen, Ao Li and Hong Peng    
Terraces play a crucial role in regulating the water cycle. The management and restoration of, and the conservation strategies and plans for basins rely heavily on the assessment of alterations in hydrological characteristics, whether natural or man-made... ver más
Revista: Water

 
Omeed Al-Kakey, Arsalan Ahmed Othman, Mustafa Al-Mukhtar and Volkmar Dunger    
Iraq, including the investigated watershed, has endured destructive floods and drought due to precipitation variability in recent years. Protecting susceptible areas from flooding and ensuring water supply is essential for maintaining basic human needs, ... ver más

 
Juan Carlos Jaimes-Correa, Francisco Muñoz-Arriola and Shannon Bartelt-Hunt    
Changing water supplies and demands, inherent to climate fluctuations and human activities, are pushing for a paradigm shift in water management worldwide. The occurrence of extreme hydrometeorological and climate events such as extended wet periods and ... ver más
Revista: Hydrology

 
Tao Huang, Wilfred M. Wollheim and Stephen H. Jones    
Fecal contamination is a significant source of water quality impairment globally. Aquatic ecosystems can provide an important ecosystem service of fecal contamination removal. Understanding the processes that regulate the removal of fecal contamination a... ver más
Revista: Water

 
Jing Li, Fan Song, Zhicheng Bao, Hongxiang Fan and Huawu Wu    
Stable isotopes of lake waters are widely used to identify the relative importance of hydrological processes on the lake water balance across the ungauged landscape via the coupled-isotope tracer model. The isotopic compositions of twenty shallow freshwa... ver más
Revista: Water