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低坝群是相对单独功能的“高坝”而言 ,是指坝高为 1m ,前后配置 ,发挥群体防治效果的河道治理工程措施。低坝群 3座为 1组。前坝起拦淤分流作用 ;中坝拦细粒泥沙及落淤 ,后坝则稳定水流。对于蛇曲状河流 ,低坝群若放射状布设 ,可诱导凹岸淤积 ,凸岸过流 ,达到稳定河床的效果。通过对北海道“S”型河道采用低坝群整治 ,13a后 ,曾经历台风暴雨的袭击 ,坝体稳定 ,河床平稳 ,且有柳类植物侵入 ,形成护岸林分 ,近似自然景观。
The low dam group is relatively independent function “high dam”, refers to the dam height of 1m, before and after the configuration, to play a group of river control measures of project effectiveness. 3 groups of low dam for a group. The former dam plays a role of silt-diversion; the fine-grained silt and sediments in the middle dam and the post-dam stabilize the water flow. For the snake-like river, if the low dam group is radially arranged, it may induce the deposition of the concave bank and the overcurrent of the bank so as to achieve the effect of stabilizing the riverbed. Through the treatment of “H” type river courses in Hokkaido, the dam has been treated by a low dam group. After the thunderstorm of 13 a, it has experienced typhoon torrential rains. The dam body is stable and the river bed is stable. In addition, there are invaded willows to form bank protection stands and approximate natural landscape.