瓯江灵昆南口封堵工程对水动力及码头航道的影响

Influence of Closure Project of South Branch of Lingkun in Oujiang River on Hydrodynamic Force,Channel and Harbor

“瓯江灵昆南口封堵工程”具有解决土地需求、提供城市东扩发展空间、缓解水资源紧缺、缩短抗台防潮的堤塘长度、改善龙湾东片的排涝条件等综合效益，因此，自20世纪70年代初提出至今30多年来，一直受到温州市政府和人民的关注。通过二维水流数学模型计算，探讨了工程实施对沿程洪水位、流速及对龙湾至口外沿程码头航道的影响。研究结果表明，若工程实施，风暴潮时的河口高水位将增加0．03～0．05m，龙湾港区和航道流速有5％～10％的减小，北汉沿程的涨落潮流速相应增加，大潮期流速增幅为8％～14％，百年一遇洪水时流速增幅为10％～25％，口外航道大潮期流速增加0．08m／s左右。研究成果可为瓯江河口的综合开发提供科学依据。

The closure project of the south branch of Lingkun in Oujiang River can bring out comprehensive benefits such as solving land demand, providing city development space, alleviating water resources shortage, shortening the length of sea embankment and improving the flood drainage condition in the east of Longwan area. Thus the closure project has been concerned by both government and people of Wenzhou since 1970s. On the basis of 2 -D numerical simulation, this paper studies the influence on high water level, velocity, channel and harbor from Longwan to estuary mouth. The research result shows as follows： The south branch of Lingkun is in the state of siltation since 1960s. High water level during storm period would be increased by 0.03-0.05 m, velocity of Longwan harbor and channel decreased by 5 % -10 %, velocity of north branch and estuary mouth increased by 8%-14% during spring tide and 10% -25% during flood time. The velocity of channel outside would be increased by 0.08 m/s. It provides scientific basis for comprehensive development of Oujiang River estuary.