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sill depth | 海槛深度 | The greatest depth over a sill. | 海槛上的最大深度。 |
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silt | 淤泥 | An unconsolidated SEDIMENT whose particles range in size from 0.0039 to 0.0625 millimetres in diameter (between CLAY and SAND size). | 一种不固结的沉积物，颗粒直径为0.0039-0.0625毫米（介于粘土和沙之间）。 |
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siltation | 淤泥沉积 | The deposition or accumulation of silt that is suspended in a body of water. | 悬浮在水体中淤泥的聚积。 |
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simplex | 单工通信 | A method in which TELECOMMUNICATION between two stations takes place in one direction at a time. | 两个台站间，同一时间仅进行单向通信的无线电通信方法。 |
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simultaneous altitudes | 同步高度 | ALTITUDES of two or more CELESTIAL BODIES observed at the same TIME. | 在同一时刻所观测的两个或更多天体的高度。 |
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simultaneous comparison of depths | 测深同步比较 | The comparison of echo sounding depths with simultaneous direct vertical measurements of DEPTH. Simultaneous comparisons are periodically ma... more | 回声测深与同时直接垂线量测的比较。定期进行同步比较，以确定回声测深仪的仪器误差。 |
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single beam echo sounder | NULL | (SBES) an ECHO SOUNDER that transmits and receives a sound pulse providing a single spot depth, as opposed to a MULTI BEAM ECHO SOUNDER. | NULL |
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single buoy mooring (SBM) | 单浮筒系船 （设备） | A large mooring buoy used by tankers to load and unload in port approaches or in offshore oil and gas fields. | 设置在港口附近或离岸油气田的大型系船浮筒，供油轮载货或卸货使用。 |
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single day tide | 全日潮 | See TIDE: DIURNAL. | 潮汐周期由每个潮汐日的一个高潮和一个低潮组成。在英国术语中亦称single day tide。 |
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single point mooring (SPM) | 单点系船（设备），单点系泊 | A mooring structure used by tankers to load and unload in port approaches or in offshore oil and gas fields. The size of the structure can v... more | 设在港口附近或离岸油气田，供油轮载货卸货使用的系船设施，其尺寸介于大型系船浮筒与人工操作浮筒... more |
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sinker | 沉锤，测深锤 | WEIGHT used to sink fishing line or SOUNDING LINE. | 用于沉下渔索或测深索的重锤。 |
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sinking | 下降流；下现蜃景 | A downward movement of surface water generally caused by converging CURRENTS or when water mass becomes more dense than the surrounding ... more | 由于潮流会聚或者当某处水团的密度高于周围的水域时，所引起的表面水向下运动。
由于异常大气折射产... more |
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siren | 汽笛，警笛 | A type of FOG SIGNAL apparatus which produces SOUND by virtue of the passage of air through slots or holes in a revolving disk. | 一种雾号装置，系空气经旋转圆盘上的槽或孔流通发出声响。 |
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SI System | 国际单位制系统
| See SYSTÈME INTERNATIONAL. | 见System International（国际单位制）。 |
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sketch map | 略图，示意图 | See MAP. | 非正规的、非常简单的地图，它虽然保持着必要的空间关系，但比例尺或方位并不真实。 |
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sketch survey | 草测，简测 | See SURVEY. | 由于缺乏时间或条件而实施的海道测量，其精度和细节程度低于选定比例尺的正常测图。 |
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skew convergence | 偏角，斜角 | The angle, on a SKEWED PROJECTION, between TRUE NORTH and skew north. | 在斜轴投影面上，真北与倾斜北之间的夹角。 |
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skewed projection | 斜轴投影 | See PROJECTION. | 用于绘制地图或海图的任何标准投影，该投影不以地图或海图内图廓线构成一般的南北向图幅。 |
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sky compass | 天空罗经 | See COMPASS. | 利用天空阳光偏振的一种天文罗经，供在极区长期处于晨昏蒙影时使用。只要天顶晴朗，不论是否可以看... more |
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sky wave | 天波 | See WAVE. | 一种间接的无线电波，由发射天线射向天空，又由电离层反射回地球，参见ground wave（电离层波）。 |