Lake Illawarra Bathymetric Survey 2022/23

Wollongong City Council, Shellharbour City Council and NSW Department of Climate Change, Energy, the Environment and Water engaged a consultant to undertake a contemporary bathymetric survey of Lake Illawarra and its tributaries followed by a comparative assessment with the 2008 bathymetric survey. This bathymetric survey was conducted to enable an analysis of sedimentation and erosion within the lake based upon historical data. There were four different techniques used - Real Time Kinematic (RTK) by foot, RTK by boat, Single Beam (SBES) by boat, and Multi Beam Echo Sounders (MBES) by boat. Data collection was conducted as close as possible along historical survey lines (2008) so that a comparison could be made during analysis.\r\n\r\nThis project provides information on the current status and recent changes of the topography of the Lake's bed, indicating the depth of water across the Lake. The comparative results determined if and where sedimentation and/or erosion is occurring. \r\n

伍伦贡市议会（Wollongong City Council）、谢尔哈伯市议会（Shellharbour City Council）与新南威尔士州气候、能源、环境与水务局（NSW Department of Climate Change, Energy, the Environment and Water）委托咨询机构，对伊拉瓦拉湖（Lake Illawarra）及其支流开展现代水深测量，并与2008年的水深测量结果开展对比评估。本次水深测量旨在依托历史数据，分析湖体内部的沉积与侵蚀情况。本次测量共采用四种技术手段：徒步式实时动态差分定位（Real Time Kinematic, RTK）、船载实时动态差分定位（RTK）、船载单波束测深系统（Single Beam Echo Sounders, SBES）以及船载多波束测深系统（Multi Beam Echo Sounders, MBES）。数据采集工作尽可能沿2008年历史测量航线进行，以保障后续分析阶段可开展有效对比。

本项目提供了伊拉瓦拉湖湖床地形的当前状态与近期变化信息，可反映全湖的水深分布状况。通过对比分析结果，可明确沉积和/或侵蚀现象的发生与否及具体发生区域。