Perturbations along headcut and their effects on gully formation.
Perturbations along headcut and their effects on gully formation.
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沿头切的扰动及其对沟壑形成的影响。
DOI：
10.2208/jscej.2001.677_205
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
T. Tsujimoto
中科院分区：
文献类型：
--
作者：
A. Dey;Tadanori Kitamura;T. Tsujimoto
采用数值方法模拟了切沟的形成过程。采用非正交边界拟合网格的二维水深平均水流模型，模拟了切沟周围的流量分布。沿着切沟单位流量的非均匀性促进了切沟的发育过程。模拟结果表明，切沟初始形态对切沟的进一步发展和完善至关重要。上游切头凸形是冲沟发育的必要条件，而下游切头凹形不利于冲沟发育。凸度越高，特别是沟头附近的凸度越大，沟道发育速度越快。
Formation process of gully-headcut has been simulated through numerical methods. 2-D depth-averaged flow model with non-orthogonal boundary fitted grid system is employed to describe discharge distribution around gully-headcut. The heterogeneity of unit discharge along headcut promotes gully development process. Simulated result shows initial shape of the gully-headcut is very important for its further development and advancement. Headcut convex shape from up-stream side is a necessary condition to develop gully, while the concave shape is disadvantageous in gully development process. Higher convexity, especially around gully-head, makes the gully development process faster.