Comparison of Linear and Nonlinear Models for Cohesive Sediment Detachment: Rill Erosion, Hole Erosion Test, and Streambank Erosion Studies
Comparison of Linear and Nonlinear Models for Cohesive Sediment Detachment: Rill Erosion, Hole Erosion Test, and Streambank Erosion Studies
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粘性沉积物分离的线性和非线性模型的比较：细沟侵蚀、孔侵蚀测试和河岸侵蚀研究
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发表时间：
2016
期刊：
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通讯作者：
E. Daly
中科院分区：
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作者：
A. Khanal;K. Klavon;G. Fox;E. Daly
粘性沉积物剥离通常是模拟渠道，堤坝，溢洪道，土坝，和内部侵蚀，使用线性过剩剪切应力的方法。然而，机制的非线性分离模型，如威尔逊模型，最近提出的文献。存在的问题，以适当的非线性关系之间施加的剪切应力和侵蚀率。因此，本研究的目的是使用三个数据集测试粘性沉积物剥离的线性和非线性剥离模型的适当性：（1）在有限的剪切应力范围内进行细沟可蚀性研究（0.9-21.4 Pa），（2）在广泛的施加剪切应力范围内的孔侵蚀试验（HALTH）（3）在小的剪应力范围内（1-4 Pa），采用线性超剪应力方程和非线性Wilson模型，通过射流冲刷试验（JESTO）定量计算的河岸可蚀性。威尔逊模型也被纳入银行的标准。
AbstractCohesive sediment detachment is typically modeled for channels, levees, spillways, earthen dams, and internal erosion by using a linear excess shear stress approach. However, mechanistic nonlinear detachment models, such as the Wilson model, have recently been proposed in the literature. Questions exist as to the appropriateness of nonlinear relationships between applied shear stress and the erosion rate. Therefore, the objective of this research was to test the appropriateness of linear and nonlinear detachment models for cohesive sediment detachment using three data sets: (1) rill erodibility studies across a limited range of applied shear stress (0.9–21.4 Pa), (2) hole erosion tests (HETs) across a wide range of applied shear stress (12.6–62.0 Pa), and (3) streambank erodibility as quantified by jet erosion tests (JETs) for the linear excess shear stress equation and the nonlinear Wilson model across a small range of shear stress (1–4 Pa). The Wilson model was also incorporated into the bank st...