江苏射阳风电场电缆敷设引起悬沙扩散影响预测

Prediction of impact of submarine cable laying on suspended sediment diffusion at Sheyang Wind Farm in Jiangsu Province

江苏射阳300 MW海上风电场的海底电缆铺设工程,将引起海底悬浮物增量重新分布,可能对周边环境产生不利影响。采用Mike21 HD嵌套模型构建了潮流场,并叠加风电场风机基础,建立了悬沙扩散模型,分析了电缆敷设施工过程中产生的悬浮物扩散情况。结果表明,电缆敷设后,风电场区35 k V电缆以及连接陆上集控中心的220 k V电缆施工时产生的悬浮物,将对电缆沿线以及江苏盐城湿地珍禽国家级自然保护区北二实验区海水水质有一定的影响;考虑到悬浮物浓度可在较短时间内迅速降低,实际影响范围远小于预测范围,电缆敷设施工对海水水质影响较小。

The submarine cable laying project of 300MW Sheyang Wind Farm in Jiangsu Province would lead to the redistribution of suspended sediment increment, which may cause negative impact on the surrounding environment. Based on the tidal current field established by Mike21 HD nested model and considering wind turbine foundation, the impact of cable laying project on the suspended sediment diffusion is analyzed. The result shows that the suspended load caused by the cable laying construction of 35 kV cables and 220 kV cables connected to the land centralized control center, will impact the sea area along the cable line and the second north experimental area in Jiangsu Yancheng Wetland National Nature Reserve （Rare Birds）. Considering that the suspended load concentration will decrease rapidly in a short time, the practical impact area would be far less than the forecast area; the impact of cable laying on water quality is slight.