通惠河通州段护坡跌水复氧试验研究

Study on reoxygenation by revetment waterfall in Tongzhou Town section of Tonghui River

以北京通惠河通州城市段为例,在长20m、宽6.5m的六角混凝土砖护坡人工跌水试验,平均净增溶解氧3.62 mg/L。进一步研究了不同护坡形式跌水复氧能力:台阶种植水生植物护坡>混凝土板种植匍匐水生植物护坡>生态板护坡>建筑砖块梅花状布置护坡>六角混凝土砖护坡,平均净增溶解氧4.25 mg/L。与其他河道曝气方法比较,护坡跌水复氧具有因地制宜、投资省、维护管理方便等特点,而且还具有重建河滨带生态系统的意义。

A case study of a revetment waterfall, which was built up by hexagonal concrete brick, with length of 20 meters and width of 6.5 meters in Tongzhou Town Section of Tonghni River, shows that dissolved oxygen （DO） in average is increased by 4.67mg/l. The reoxygenation abilities of different types of revetment waterfalls were also tested. The results show that the revetment with steps and aquatic plants 〉 the one of concrete slab with creeping plants 〉 the one of ecological slab 〉 clay bricks placed with shape of plum blossom 〉 the one of hexagonal concrete brick. The DO in average increased 4.25 rag/l. Compared with other methods of aeration in rivers, the revetment waterfall has the characteristics of adaptation to local conditions, decreasing investment and easy maintenance.