京杭运河杭州城区段水体景观效应改善研究

Study on Improving Effect of Water Landscape in Hangzhou Section of Beijing-Hangzhou Grand Canal

针对京杭运河杭州城区段水体悬浮物含量高、透明度低、景观效应差的问题,通过平流沉淀池模型模拟运河主要断面水体中悬浮物的沉淀性能,结果表明,顾家桥、武林门、勤丰桥、拱宸桥断面水体的沉淀性能较好,而义桥断面水体的沉淀性能较差。另外,船只通航对水体底泥扰动强烈,大幅度增加了水体的浊度。为此,结合京杭运河的通航状况与规划,拟通过运河航运功能调整和管理,来提高白天时段运河水体的透明度。

Hangzhou section of the Beijing-Hangzhou Grand Canal has the characteristics of high suspended solids, low transparency and poor landscape effect. The settleability of suspended solids in wa- ters at the main sections of the Grand Canal was studied by horizontal-flow sedimentation tank model. The results indicated that suspended solids in waters at Gujia Bridge, Wulinmen, Qinfeng Bridge and Gongchen Bridge had good settleability, whereas those in water at Yi Bridge had poor settleability. In ad- dition, shipping could stir the sediments which increased the water turbidity. Based on the shipping situa- tion and the planning of the Grand Canal, the goal of improving the water transparency in daytime was to be implemented by the adjustment and management of shipping function in the Grand Canal.