The prism of the Lignano tidal inlet was approximately constant over the last forty years, although the section width has halved. This has led to questions concerning the factors that most influence the tidal prism, and on the applicability of the well-known A–P relationship. A conceptual scheme of the sea–channel–lagoon system has been used to perform a sensitivity analysis of different parameters that characterize both the basin and the inlet cross-section. A 2D hydrodynamic model has been applied to evaluate the prism and compare it to the one derived by a static method, which is the basis of the analytical derivation of the A–P linkage. Three regimes have been found in the prism variability as a function of the basin extension: a linear static regime between prism and basin area; an asymptotic regime in which the prism depends only on the basin bottom friction; and an intermediate one. In addition, the roles of the inlet and channel sizes on the prism value have been investigated. The results, compared to the empirical relationships between the prism and the inlet cross-section, show that a variation in the cross-sectional area does not always corresponds to a change in tidal prism.

中文翻译：

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关于潮汐棱镜：盆地扩展，底部摩擦和入口横截面的作用

尽管截面宽度减半，但在过去40年中，利尼亚诺潮汐入口的棱镜大致恒定。这引起了有关最影响潮汐棱镜的因素以及众所周知的A–P关系的适用性的问题。海河泻湖系统的概念方案已用于对表征盆地和入水口剖面的不同参数进行敏感性分析。已应用二维流体动力学模型评估棱镜并将其与静态方法得出的结果进行比较，这是对A–P进行解析推导的基础连锁。在棱镜可变性中发现了三种与盆地扩展有关的函数：棱镜与盆地面积之间的线性静态模式；以及 一种渐近状态，其中棱镜仅取决于盆底摩擦；和一个中间的。此外，还研究了入口和通道尺寸对棱镜值的作用。与棱镜和入口横截面之间的经验关系相比，结果表明，横截面积的变化并不总是与潮汐棱镜的变化相对应。