Abstract Three-dimensional modeling was performed in Tongyeong, South Korea to identify a space suitable for Yesso scallop farming that may not be successful if seawater temperature remains above 22 °C. In the research area, an underwater basin was found at a depth of 70 m; the depth outside the basin was not deeper than 30 m. It was expected that the water temperature in the interior of the basin might be low enough for farming during summer. The present study was then designed to investigate the temperature distribution in this basin area to verify if a water layer with consistently low temperature existed below the surface layer, using a MOHID (MOdelo HIDrodinamico) three-dimensional numerical model. The model applied mixed vertical coordinates so that the difficulties in modeling near the basin, where water depth sharply changes, could be overcome. In addition, a multi-level nesting system was developed based on the 72 -h forecasting system of the sea status around South Korea, which increased the modeling accuracy using updated boundary conditions. The model was validated by the measured tide and temperature data. The results showed that a strong thermocline was formed at depth of 15 m and a sub-surface space existed at depths deeper than 30 m, where seawater temperature was lower than 22 °C even in summer, which indicates the possibility of successful farming in the research area. The measurements also supported this result because dissolved oxygen and chlorophyll-a were not scarce in the sub-surface space probably due to the strong tidal mixing that could bring the surface seawater properties down below the thermocline. It was also found that the model was effective in resolving the thin thermocline and the sub-surface space below it due to the mixed vertical coordinate system.

中文翻译：

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使用多级嵌套系统的三维数值建模，用于识别韩国统营扇贝养殖的水层

摘要 在韩国统营进行了三维建模，以确定适合 Yesso 扇贝养殖的空间，如果海水温度保持在 22 °C 以上，则可能无法成功养殖。研究区发现水下盆地，水深70 m；盆地外深度不超过30 m。预计盆地内部的水温可能足够低，适合夏季耕种。然后，本研究旨在调查该盆地区域的温度分布，以使用 MOHID (MOdelo HIDrodinamico) 三维数值模型验证地表层以下是否存在持续低温的水层。该模型采用混合垂直坐标，使得在水深急剧变化的盆地附近建模困难，可以克服。此外，在韩国72小时海况预报系统的基础上，开发了多层次嵌套系统，利用更新的边界条件提高了建模精度。该模型通过实测的潮汐和温度数据进行了验证。结果表明，在15 m深处形成强温跃层，在30 m以上深度存在次表层空间，即使在夏季海水温度也低于22 °C，表明该区有成功养殖的可能性。研究领域。测量结果也支持了这一结果，因为地下空间中溶解氧和叶绿素 a 并不稀缺，这可能是由于强烈的潮汐混合可能导致地表海水特性下降到温跃层以下。