The Neretva River estuary, located in Croatia, on the eastern coast of the Adriatic Sea, is a typical example of a micro-tidal salt-wedge estuary. Here, the salt-wedge dynamics was investigated based on continuous field measurements and numerical modeling for the period 2015-2018. A two-layer shallow-water numerical model proved to be an accurate and reliable tool for computing the salt-wedge dynamics in the Neretva River estuary. The simulations showed that the river inflow has the strongest impact on the salt-wedge dynamics, whereas sea levels and tides have a much smaller effect, mainly related to daily variations of the salt-wedge length and volume. A set of simple equations were derived, which link the salt-wedge intrusion length, salt-wedge volume, and salt-wedge spread to the river flow rate. It was shown that, during summer, the salt-wedge intrudes more than 20 km upstream from the mouth, exacerbating the salinization of aquifers and soils. The assessment of salt-wedge dynamics in the Neretva River estuary is thus a crucial element for planning, designing, and managing the irrigation system in this coastal region, for sustainable development of agriculture and protection of water resources.

位于克罗地亚，亚得里亚海东海岸的涅雷特瓦河河口是微潮盐楔河口的典型例子。在此，我们基于连续现场测量和数值模型对2015-2018年期间的盐楔动力学进行了研究。两层浅水数值模型被证明是计算内雷特瓦河河口盐楔动力学的准确而可靠的工具。模拟表明，河流入流对盐楔运动的影响最大，而海平面和潮汐的影响要小得多，这主要与盐楔的长度和体积的每日变化有关。导出了一组简单的方程，将盐楔的侵入长度，盐楔的体积和盐楔的扩散与河流流速联系起来。结果表明，在夏季，盐楔从河口上游侵入20多公里，加剧了含水层和土壤的盐碱化。因此，对内雷特瓦河河口的盐楔动态进行评估，对于规划，设计和管理该沿海地区的灌溉系统，实现农业的可持续发展和水资源保护至关重要。