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作者研制出一种能在高达5米的破波中测量波浪、海流和近岸区海底地形剖面的新型数据采集系统,並成功地进行了现场试验。该系统的机械装置为:装有一根直立桅杆的滑撬,设置在海滩陆侧的一台双鼓绞车,从绞车的一个鼓经三个滑轮到绞车的另一个鼓的缆绳。三个滑轮位于一直角三角形的三个角上。滑撬放置在缆绳组成的三角形中与海岸方向垂直的那条边上,由绞车的一个鼓朝离岸方向牵引,另一个鼓朝陆地方向牵引。在将滑撬沿垂直于海岸的测线拖运的同时,由位于绞车陆侧的红外测距仪和滑撬桅顶的光学棱镜测出海底的地形剖面。滑撬架上装有一台压力传感器和双轴电磁海流计。所测数据在滑撬上经编码后发送给岸上的接收记录站。初步结果表明,高能涌浪期间接近海底的离岸流对近岸区海底地形剖面形态的变化具有重要的作用。
The authors developed a new data acquisition system capable of measuring waves, currents and submarine topography in up to five meters of breakwaters and successfully conducted field trials. The mechanics of the system are: a skid equipped with an upright mast, a two-drum winch on the land side of the beach, cables from one drum of the winch to the other drum of the winch via three pulleys. The three pulleys are located on the three corners of a right-angled triangle. The skid is placed on the side of the triangle perpendicular to the coast of the cable consisting of triangles, one of which is pulled offshore by a winch and the other is pulled towards the ground. At the same time as the sled was towed along the survey line perpendicular to the coast, the topographic profile of the seafloor was measured by an optical rangefinder on the land side of the winch and a skidding masthead. The skid mount has a pressure sensor and a biaxial electromagnetic current meter. The measured data is encoded on the skid and sent to the receiving station on shore. The preliminary results show that the offshore flow close to the seafloor during the high-energy surge plays an important role in the change of seafloor topography profile in the coastal area.