Oxygen is needed in water to maintain the natural ecological balance and the health of organisms. The amount of dissolved oxygen (DO) in water can be increased naturally in different ways. In particular, some hydraulic structures are designed so reoxygenation of water occurs spontaneously over a short distance and in a short time. Baffled chutes are designed to dissipate the energy of flow in irrigation systems, wastewater systems and stormwater systems. Staggered baffle blocks placed in a chute channel not only dissipate the energy of the water but also allow free oxygen transition between the water–air surface by means of hydraulic jumps. While water flows over, between and around the blocks, air bubbles are entrained into the water. The entrained air bubbles in the flow start to dissolve within the chute and the DO concentration in the water thus increases. In this study, the amount of DO was determined for baffle blocks with six different geometric shapes, different flow discharges and angle variations (10° ≤ α ≤ 56°). The oxygen transfer efficiency of the new baffle blocks designed in this study was found to be very effective. Different block types were found to have greater oxygen transfer efficiency for chutes with different slopes.

中文翻译：

---

新型挡板块的氧气传输效率比较

水中需要氧气来维持自然生态平衡和生物体的健康。水中溶解氧 (DO) 的量可以通过不同的方式自然增加。特别是，一些水工结构的设计使得水的再氧化在短距离内和短时间内自发发生。挡板溜槽旨在消散灌溉系统、废水系统和雨水系统中的水流能量。放置在溜槽通道中的交错挡板块不仅可以消散水的能量，还可以通过水跃的方式允许自由氧在水-空气表面之间转移。当水流过块体、块体之间和块体周围时，气泡会被夹带到水中。水流中夹带的气泡开始在溜槽内溶解，水中的 DO 浓度因此增加。在这项研究中，测定了具有六种不同几何形状、不同流量和角度变化（10°≤ α≤56  °）。研究发现，本研究中设计的新型挡板块的氧气传输效率非常有效。发现不同的块类型对于不同坡度的溜槽具有更大的氧气传输效率。