This paper focuses on finding efficient solutions for the design of a highly permeable pile spur (or slit type) dike field used in morphologically dynamic alluvial rivers. To test the suitability of different arrangements of this type of permeable pile spur dike field, laboratory experiments were conducted, and a three-dimensional multiphase numerical model was developed and applied, based on the experimental conditions. Three different angles to the approach flow and two types of individual pile position arrangements were tested. The results show that by using a series of slit-type spurs, the approach velocity of the flow can be considerably reduced within the spur dike zone. Using different sets of angles and installation positions, this type of permeable spur dike can be used more efficiently than traditional dikes. Notably, this type of spur dike can reduce the longitudinal velocity, turbulence intensity, and bed shear stress in the near-bank area. Additionally, the deflection of the permeable spur produces more transverse flow to the opposite bank. Arranging the piles in staggered grid positions among different spurs in a spur dike field improves functionality in terms of creating a quasi-uniform turbulence zone while simultaneously reducing the bed shear stress. Finally, the efficacy of the slit-type permeable spur dike field as a solution to the riverbank erosion problem is numerically tested in a reach of a braided river, the Brahmaputra–Jamuna River, and a comparison is made with a conventional spur dike field. The results indicate that the proposed structure ensures the smooth passing of flow compared with that for the conventional impermeable spur structure by producing a lower level of scouring (low bed shear stress) and flow intensification.

中文翻译：

---

狭缝型透水丁坝油田的三维流动特征：护河功效

本文的重点是为在形态动态的冲积河流中使用的高渗透性桩刺（或狭缝型）堤防寻找有效的解决方案。为了测试这种类型的渗透桩丁坝场不同布置的适用性，进行了实验室试验，并根据试验条件开发并应用了三维多相数值模型。测试了三种不同的进场角度和两种单独的桩位布置。结果表明，通过使用一系列狭缝式支流，可以显着降低丁坝区内的水流接近速度。使用不同的角度和安装位置，这种类型的渗透丁坝可以比传统的堤防更有效地使用。尤其，这种丁坝可以降低近岸区的纵向速度、湍流强度和床层剪应力。此外，可渗透支线的偏转会产生更多的横向流动到对岸。在丁坝场中的不同支路之间以交错的网格位置排列桩在创建准均匀湍流区方面提高了功能，同时降低了河床剪应力。最后，在辫状河布拉马普特拉河-贾木纳河段对狭缝式可渗透丁坝场作为解决河岸侵蚀问题的有效性进行了数值测试，并与传统丁坝场进行了比较。