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Fundamental Study on the Behaviour of Submarine Groundwater Discharged into the Coastal Sea

机译：排入沿海海域的海底地下水行为的基础研究

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In order to investigate the behaviour of submarine groundwater flowing into the ocean, field observation, hydraulic tank experiments, and numerical simulations were carried out. As the results, the early-stage behaviour of the discharged submarine groundwater as density plume could be categorized into three types due to the ratio of discharge velocity to the background horizontal current velocity. When the ratio is relatively large, the behaviour of the discharged water can be predicted by the conventional theoretical model for the density plume. When the velocity ratio is relatively small, the inclination of the plume path gets smaller than the predicted values by the conventional model. It is because the effect of background diffusion becomes larger. If the velocity ratio is very small, the discharged water is transported almost along the sea bottom, which is the situation of the field observation. This result suggests that the submarine groundwater discharge in Toyama Bay supplies the nutrients for the benthic producer such as seagrass, rather than for the pelagic phytoplankton.
机译：为了研究海底地下水流入海洋的行为，进行了现场观察，液压缸实验和数值模拟。结果，由于排放速度与背景水平电流速度之比，排放的海底地下水作为密度羽流的早期行为可分为三类。当该比率相对较大时，可以通过用于密度羽流的常规理论模型来预测排放水的行为。当速度比较小时，羽流路径的倾角变得小于常规模型的预测值。这是因为背景扩散的影响变大。如果速度比非常小，则排出的水几乎沿着海底传输，这是现场观察的情况。这一结果表明，富山湾的海底地下水排放为底栖生产者（例如海草）而不是浮游浮游植物提供了养分。

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