复杂河口汊道封堵后有关的潮流和泥沙问题

Tidal current and sediment problems related to the blocking of a branch in complicated bifurcated tidal estuary

研究了瓯江南口封堵后有关的潮流和泥沙问题。首先对复杂的瓯江口的自然条件和冲淤演变进行了分析;其次,使用二维波浪潮流泥沙数学模型、波浪潮流泥沙物理模型及三维潮流数学模型等研究手段,对瓯江南口现有潜堤加高进行封堵后的二维潮流场、泥沙场、地形冲淤变化和三维潮流场进行了模拟研究,对瓯江泄洪排涝的影响进行了计算和分析。研究结果表明,从对周围水沙环境和瓯江泄洪排涝的影响角度考虑,将现潜堤加高进行南口封堵的方案是可行的。

The tidal current and sediment problems related to the blocking of the south branch of the Oujiang Estuary were studied. First, natural conditions and seabed evolution of the estuary were analyzed. Then, by means of the 2D mathematical models and physical model the study on wave, tidal current and sediment, as well as the seabed erosion and deposition before and after blocking were carried out. The effect of existing submerged dyke, and the influences of flood discharge and drainage of the Oujiang River were also studied. The results show that it is feasible to block up the South Branch of the Oujiang Estuary by heightening the present submerged dyke with the impact of the blockage project on water flow, sediment and flood discharge and drainage of the Oujiang River are concerned.