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bottom: nature of | 底质
| The feature of the BOTTOM including the material of which it is composed and its physical characteristics. Also called character (or charact... more | 海底特征，包括构成物质及其物理特性，亦称character (or characteristics) of the bottom（海底特征）或quality of the ... more |
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bottom characteristics | （海底）底质
| Designations used on survey and nautical charts to indicate the consistency, colour, and classification of the sea bottom. Also called NATUR... more | 在测量和海图中用于表示海底密度、颜色、分类等特性的名词。亦可称之为nature of the bottom（海底特性）、... more |
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bottom contour chart | 海底地形图，海底等深图，海洋水深图
| A chart designed for surface and sub-surface bathymetric navigation seaward of the 100-fathom contour. Bottom configuration is portrayed by ... more | 为100英寻等深线以内的水面和水下航行而设计的一种海图。通过等深线以及所选择的水深点描绘出海底的... more |
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bottom friction | 海底摩擦力
| The force resulting from the interaction between the ocean bottom and water particle motion over it. | 水分子在海底面运动产生的摩擦力。 |
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bottom ice | 底冰
| See ANCHOR ICE. | 参见anchor ice（底冰）。 |
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bottom profiler | 海底剖面仪
| An ECHO SOUNDER for precision surveys of the sea bottom surface. | 用于进行海底表层精确测量的回声测深仪。 |
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bottom relief survey | 海底地形测量
| A survey conducted to obtain information on the spatial characteristics of the sea bottom relief. | 为获取海底地形空间特征而开展的测量。 |
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bottom sample | 底质样本
| A portion of the sea bottom material brought to the surface for examination. See also CORE. | 从海底取出的用于研究的海底表面样品。亦可参见core（取样）。 |
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bottom sampler | 底质取样器
| Any device for obtaining a BOTTOM SAMPLE. See also CORER, DREDGE, DRIVER ROD, GRAB and SNAPPER. | 任何可以获取底质样本的设备。参见corer（采样管）、dredge（底质采集器）、driver rod（沉锤取样管）、snapp... more |
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bottom sampling | 底质取样
| The process of collecting bottom samples. | 获取底质样品的过程。 |
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bottom sediments | 海底沉积物
| See SEDIMENTS: BOTTOM. | 参见bottom sediment（海底沉积物）。 |
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Bouguer anomaly | 布格异常
| A difference between an observed value of GRAVITY and a theoretical value at the point of observation, which has been corrected for the effe... more | 指观测点的重力观测值与理论值之差。当把地形模型视为处在一个范围无限大的平面时，该差值仅用来改... more |
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boulder | 大卵石，巨砾石
| A rounded ROCK with a diameter of 256 millimetres (about 10 INCHES) or larger. | 直径为256毫米（约10英寸）或更大的圆形石块。 |
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boulder clay | 泥砾
| See TILL. | 参见till（泥砾）。 |
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boundary | 界限，分界线
| Anything marking a limit; bound; BORDER. | 标示范围、界限和边界的线。 |
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boundary layer | 边界层
| The LAYER of fluid in the immediate vicinity of a bounding surface. It is the LAYER in which frictional forces are not negligible. | 最接近边界面的流体层，该层的摩擦力是不可忽略的。 |
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boundary monument | 界碑，界标
，界石 | A material object placed on or near a boundary line to preserve and identify the ground location of the boundary line. Where it is impractic... more | 一种放置在界线上或界线附近的标志，用于维护和标识地面边界线。若在界线上或附近处无法设置界碑，... more |
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boundary wave | 界面波，边波
| See WAVE: INTERNAL. | 参见internal wave（内波）。 |
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Bourdon tube | 波尔登管
| Closed, curved, flexible tube of elliptic cross-section which is deformed, according to type, by variations of ATMOSPHERIC PRESSURE or tempe... more | 一种密闭弯曲的软管，断面呈椭圆形。根据管子的不同型号可用不同的气压或温度使其变形，因而可用来... more |
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Bowditch rule | 包狄法则
| A method of ADJUSTMENT of TRAVERSES. | 一种导线平差方法。 |