Autonomous Underwater Vehicle (AUV) Sidescan Sonar Data - Caswell Sub-basin, Browse Basin Marine Survey (GA0345/GA0346/TAN1411)

Geoscience Australia (GA) conducted a marine survey (GA0345/GA0346/TAN1411) of the north-eastern Browse Basin (Caswell Sub-basin) between 9 October and 9 November 2014 to acquire seabed and shallow geological information to support an assessment of the CO2 storage potential of the basin. The survey, undertaken as part of the Department of Industry and Science's National CO2 Infrastructure Plan (NCIP), aimed to identify and characterise indicators of natural hydrocarbon or fluid seepage that may indicate compromised seal integrity in the region. The survey was conducted in three legs aboard the New Zealand research vessel RV Tangaroa, and included scientists and technical staff from GA, the NZ National Institute of Water and Atmospheric Research Ltd. (NIWA) and Fugro Survey Pty Ltd. Shipboard data (survey ID GA0345) collected included multibeam sonar bathymetry and backscatter over 12 areas (A1, A2, A3, A4, A6b, A7, A8, B1, C1, C2b, F1, M1) totalling 455 km2 in water depths ranging from 90 - 430 m, and 611 km of sub-bottom profile lines. Seabed samples were collected from 48 stations and included 99 Smith-McIntyre grabs and 41 piston cores. An Autonomous Underwater Vehicle (AUV) (survey ID GA0346) collected higher-resolution multibeam sonar bathymetry and backscatter data, totalling 7.7 km2, along with 71 line km of side scan sonar, underwater camera and sub-bottom profile data. Twenty two Remotely Operated Vehicle (ROV) missions collected 31 hours of underwater video, 657 still images, eight grabs and one core.This catalogue entry refers to high and low frequencey sidescan sonar data collected using an Edgetech FS (120 kHz 410 kHz) system mounted to the AUV (GA0346) operating using the following parameters:* High Frequency SSS Trigger : 5 Hz; Pulse type: 0 : 390 kHz to 430 kHz; 2 ms (82 m range); Transmit Power: 100%* Low Frequency SSS Trigger coupled with SSS High (5 Hz); Pulse type: 0 : 98 kHz to 111 kHz; 9 ms (158 m range); Transmit Power: 100%

澳大利亚地球科学局（Geoscience Australia, GA）于2014年10月9日至11月9日，针对东北布劳斯盆地的卡斯韦尔次盆（Caswell Sub-basin）开展了编号为GA0345/GA0346/TAN1411的海洋调查，以获取海底与浅部地质数据，支撑该盆地二氧化碳封存潜力的评估工作。本次调查作为澳大利亚工业与科学部国家二氧化碳基础设施计划（National CO2 Infrastructure Plan, NCIP）的组成部分，旨在识别并表征区域内可能指示盖层完整性受损的天然烃类或流体渗漏标识。

调查由新西兰研究船“坦加罗阿号”（RV Tangaroa）分三个航段实施，参与单位包括澳大利亚地球科学局、新西兰国家水与大气研究所（National Institute of Water and Atmospheric Research Ltd., NIWA）及Fugro Survey Pty Ltd.的科研与技术人员。

船载数据（航次编号GA0345）涵盖12个作业区（A1、A2、A3、A4、A6b、A7、A8、B1、C1、C2b、F1、M1），总面积455平方千米，作业水深范围为90~430米，同时采集了总长611千米的浅地层剖面数据。项目组另在48个站位开展海底采样，共获取99个Smith-McIntyre采泥器样品与41根活塞岩心。

自主水下航行器（Autonomous Underwater Vehicle, AUV，航次编号GA0346）采集了总面积7.7平方千米的高分辨率多波束测深与反向散射数据，同时获取了总长71千米的侧扫声呐、水下摄像与浅地层剖面数据。22次遥控水下机器人（Remotely Operated Vehicle, ROV）作业累计采集了31小时水下视频、657幅静态图像、8个沉积物样与1根岩心。

本目录条目涉及搭载于自主水下航行器（GA0346）的Edgetech FS（120 kHz~410 kHz）系统采集的高频与低频侧扫声呐数据，其作业参数如下：
* 高频侧扫声呐：触发频率5 Hz；脉冲类型：0：390 kHz~430 kHz；脉宽2 ms（探测范围82 m）；发射功率100%
* 低频侧扫声呐：与高频侧扫声呐联动触发（5 Hz）；脉冲类型：0：98 kHz~111 kHz；脉宽9 ms（探测范围158 m）；发射功率100%