The application of ADCP to the measurement of current system at the hydrothermal active areas
The application of ADCP to the measurement of current system at the hydrothermal active areas
复制标题
ADCP在热液活动区电流系统测量中的应用
DOI：
10.1109/ccm.2003.1194322
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
K. Mitsuzawa
中科院分区：
文献类型：
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作者：
K. Mitsuzawa
热液区直流电测量是了解热液系统的重要因素之一。ADCP的应用被认为是一种有效的测量海流的一般了解。RDI Workhorse Sentinel 300 kHz ADCP在西太平洋热液活跃区的几次科学巡航中，尝试用于连接JAMSTEC/深拖声纳系统、载人潜水器Shinkai 2000，并由海豚3 K部署在海底。2000年1月，JAMSTEC/深拖声纳在南马里亚纳海槽的热液区进行了精确地形测量。在测量巡航期间，ADCP以下视方式连接在声纳上。它被拖离海底约80- 120米，速度不到1节。根据观察，声波后向散射太弱，无法测量超过30米的范围;此外，垂直分量很难测量，这取决于船舶的升沉效应。有必要减少落鱼处的升沉运动，例如使用通过二次电缆与主落鱼分离的子落鱼系统。冲绳海槽中段的热液区，被称为几个活跃的热液区。2000年6月，在温度超过230/spl deg/C，有30米高的巨大烟囱的地区，使用新海2000进行了ADCP海流测量。ADCP被安装在新海2000上作为有效载荷。Shinkai 2000以0.3- 0.5 kts的速度运行，保持其深度从870米到900米。在这次观测中，获得了大约100米范围内的海流剖面。在热液活动区测得的上升流约为10- 20厘米/秒。在同一地区，ADCP被部署了23小时，作为向上看旁边的热液烟囱。它于2000年6月被海豚3 K号船解决并收回。电流测量条件大约每6小时改变一次，在半个观测周期内，声波后向散射信号太弱，无法测量30 m范围。这种变化被认为是潮汐引起的。热液流体的水柱中含有足够的粒子进行声后向散射，而该地区的标准深水过于清澈，无法获得足够的声后向散射。在可测量的时间段内，向上流被测量为其最大流速超过20厘米/秒。
Direct current measurement in the hydrothermal area is one of the important factors to understand the hydrothermal system. The application of ADCP is known to an effective to measure the general understanding of the ocean current. The RDI Workhorse Sentinel 300kHz ADCP was tried to use attaching on the JAMSTEC/Deep Tow Sonar System, the manned submersible Shinkai 2000 and deploying at the seafloor by ROV Dolphin 3K during a few scientific cruises at the hydrothermal active areas in the Western Pacific. The JAMSTEC/Deep Tow Sonar was carried out to survey for precise topographic at the hydrothermal area in the Southern Mariana Trough in January 2000. During the survey cruise, the ADCP was attached on the sonar with down looking. It was towed about 80-120m above the seafloor as a speed of less 1kts. According to the observation, acoustic backscattering was too weak to measure over 30m ranges; in addition vertical component was difficult to measure depending on the heaving effect from the ship. It is necessary to reduce the heaving motion at the fish such as using sub-fish system that is separated from main-fish via a secondary cable. In the hydrothermal area of the Mid Okinawa Trough, which is known as several active hydrothermal. areas with huge chimneys which height about 30m as temperature of over 230/spl deg/C, the current measurement by ADCP was carried out using the Shinkai 2000 in June 2000. ADCP was mounted down looking on the Shinkai 2000 as a payload. The Shinkai 2000 was operated with 0.3-0.5kts keeping its depths from 870m to 900m. During this observation, it was obtained the current profile as about 100m range. It was measured about 10-20cm/sec upward current in the hydrothermal active area. In the same area, ADCP was deployed for 23 hours as up looking at beside of the hydrothermal chimney. It was settled and recovered by the ROV Dolphin 3K in June 2000. Current measurement condition was changed about every 6 hours; in a half period of the observation, acoustic backscattering signal is too weak to measure over 30m range. This change was considered to cause by the tide. The water column of hydrothermal fluid contains enough particles for acoustic backscattering; however the standard deep water of this area is too clear to obtain the enough acoustic backscattering. During measurable period, upward current was measured as its maximum current speed as over 20cm/sec.