Rapid changes in the near-bottom water temperature are important environmental factors that can significantly affect the growth and development of species in the bottom culture. The object of this research is to investigate the mechanism causing these rapid changes within a bottom culture area near the Zhangzi Island. The hydrographic transects observations in the North Yellow Sea (NYS) suggest that our mooring station is very close to the tidal mixing front. The horizontal advection of the tidal front has induced the observed tidal change of bottom temperature at the mooring station. Analysis of the mooring near-bottom temperature and current measurements show that the angle between the tidal current horizontal advection and the swing of the tidal front is crucial in determining the variation trend of temperature. When the angle equals 90°, the horizontal tidal current advects along the isotherms so the temperature remains the same. When the angle is between 0° and 90°, the seawater moves from deep water to the warmer coastal zone and the temperature decreases. In contrast, the horizontal tidal advection moves the coastal warm water to the mooring station and the water temperature increases when the angle is between 90° and 180°. The amplitude of the temperature change is proportional to the magnitude of the horizontal temperature gradient and the tidal excursion in the direction of the temperature gradient. This study may facilitate the choice of culture area in order to have a good aquaculture production.

中文翻译：

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夏季the子岛底部水产养殖区近底部温度的快速变化

近底部水温的快速变化是重要的环境因素，可以显着影响底层养殖物种的生长和发育。这项研究的目的是调查在章子岛附近的底层养殖区内引起这些快速变化的机制。北黄海（NYS）的水文断面观测表明，我们的系泊站非常靠近潮汐混合前沿。潮汐前沿的水平对流引起了在系泊站底部温度的潮汐变化。对系泊近底部温度和电流测量值的分析表明，潮流水平对流与潮流前沿摆动之间的夹角对于确定温度的变化趋势至关重要。当角度等于90°时 水平潮流沿等温线平流，因此温度保持不变。当角度在0°和90°之间时，海水从深水移动到较温暖的沿海地区，温度降低。相比之下，水平潮汐平流将沿海温水移动到系泊站，并且当角度在90°和180°之间时水温升高。温度变化的幅度与水平温度梯度的大小和沿温度梯度方向的潮汐偏移成正比。这项研究可能有助于选择养殖区域，从而获得良好的水产养殖产量。海水从深水流向温暖的沿海地区，温度下降。相比之下，水平潮汐平流将沿海温水移动到系泊站，并且当角度在90°和180°之间时水温升高。温度变化的幅度与水平温度梯度的大小和沿温度梯度方向的潮汐偏移成正比。这项研究可能有助于选择养殖区域，从而获得良好的水产养殖产量。海水从深水流向温暖的沿海地区，温度下降。相比之下，水平潮汐平流将沿海温水移动到系泊站，并且当角度在90°和180°之间时水温升高。温度变化的幅度与水平温度梯度的大小和沿温度梯度方向的潮汐偏移成正比。这项研究可能有助于选择养殖区域，从而获得良好的水产养殖产量。温度变化的幅度与水平温度梯度的大小和沿温度梯度方向的潮汐偏移成正比。这项研究可能有助于选择养殖区域，从而获得良好的水产养殖产量。温度变化的幅度与水平温度梯度的大小和沿温度梯度方向的潮汐偏移成正比。这项研究可能有助于选择养殖区域，从而获得良好的水产养殖产量。