杭州城西河网清淤优化调度

引水进入城市河网可快速提升河道水质,但也会导致泥沙淤积等问题;城市河网不仅河道众多,还有水闸等水工建筑物,使得水沙输移问题变得更为复杂.为了使泥沙尽量少淤积于不易清淤的河道,需优化河网水闸的调度.首先建立了考虑水闸的河网一维泥沙输移数学模型,利用实测水沙数据验证其精度.通过模型计算不同引水流量工况下杭州城西河网泥沙的淤积量及淤积分布,得到泥沙淤积率最低以及最利于清淤时的河网水闸优化调度方案,可为城市河网泥沙减淤及清淤提供理论依据和参考.

Optimal scheduling on dredging for river network of west Hangzhou

Diversion into the urban river networks can quickly improve the water quality, but it brings the problem of sediment deposition at the same time. Urban river networks possess not only numerous channels but also hydraulic structures such as sluices, which makes the research on water flow and sediment transport more complex. In order to deposit more sediment in the river reaches which are easy to be dredged, optimization measures of sluice scheduling are thus necessary. This paper established a 1D mathematical model of sediment transport considering sluices for river networks in the first place. Then, the model was verified by the measured data of water flow and sediment. The amount of sediment deposition and its distribution in west Hangzhou river network were calculated under each operating condition of the sluices with different diversion discharges by the model. Optimal scheduling of the sluices that had the lowest deposition ratio and the most conducive dredging work was further proposed as a result of the analysis on calculation data, respectively. The results this paper presents can provide a useful reference and guidance for sediment dredging of urban river networks.