奉化桐照渔港水动力与泥沙环境特征研究

Hydrodynamic and sediment environment characteristics for Tongzhao fishing port in Fenghua

桐照渔港由于周边围涂工程,现有部分锚地和码头淤积严重,对渔船避风安全提出挑战,拟规划实施渔港扩建工程。根据该水域的资料搜集与现场水文泥沙实测数据分析,对水动力与冲淤环境特征进行分析,并建立平面二维水动力模型对海域潮流场与悬沙分布进行数值模拟与复演计算,为渔港扩建工程提供科学依据。研究结果表明:本水域涨落潮流向大致与潮汐汊道走向一致,呈现往复流趋势,沉积物类型属粉砂质黏土,悬沙粒径与此基本相当,淤泥质海岸主要呈淤积趋势并受人类活动影响显著,在当前水动力条件下不会产生较大的冲淤幅度,现状桐照渔港码头、东北侧航槽及港湾等水域平均淤强0.2～0.3 m/a,最大可达0.50 m/a以上。

Due to the surrounding area of Tongzhao fishing port, the existing part of the anchorage and wharf have beenheavily deposited, it challenges the safety of the fishing vessels, we planned to carry out the expansion project of fishing port.According to the data collection and hydrology survey data of project site, we analyzed the characteristics of hydrodynamic andsedimentation environment, and applied a two-dimensional hydrodynamic model in numerical calculation and playback of tidecurrent and concentration field, it provides scientific basis for further expansion of fishing port. The result of research showsthat, flood and ebb flow direction is roughly the same as the tide inlet, is basically reciprocating flow. Sediment types of siltyclay, the suspended sediment grain size almost same. The coastline showed a trend of deposition, it affected more by humanactivities recently. In the current coastline of morphology and hydrodynamic conditions, large amplitude erosion and depositionwould not be occurred. In the present condition, the average silting intensity of wharf of Tongzhao fishing port, northeastchannel and harbour were 0.2 m/a to 0.3 m/a, maximum more than 0.50 m/a.