环抱式港池水体交换研究--以连云港徐圩港区为例

环抱式港池普遍存在水体交换能力较弱的问题，水体交换通道是提高港区水体交换能力主要方法之一。文中以规划中的连云港徐圩港区为例，建立对流扩散模型，通过计算研究徐圩港区对流与扩散之间的关系，分析港区水体交换机理和主要影响因素；通过设置水体交换通道探讨其对港区水体交换功能改善的主要影响因素。研究表明：对流作用在徐圩港区水体交换中占有绝对优势，增大流速可提高港区的水体交换能力；水体交换通道的断面面积及断面形状对港区的水体交换效果影响较大。

Researches on water exchange for encircled basin-- Take Xuwei harbor in Lianyungang as an example

The encircled basin has a weak capability for water exchange. Water exchange channel is one of the main methods to improve harbor water exchange capability. A convection-diffusion model based on the project of Xuwei harbor in Lianyungang is established and calculated for researching the relationship between convection and diffusion, analyzing the mechanism of harbor water exchange and the main influencing factors. The main factors of influencing harbor water exchange improvements is studied when setting water exchange channels. Results indicate that： convection play a dominate role in the water exchange of Xuwei harbor; water exchange capability in harbor can be enhanced by increasing current velocity; cross-sectional area and shape of the channel have a great effect on the result of water exchange in Xuwei harbor.