Bathymetric Survey Using Remote Controlled Survey Boat
ALS Hydrographics undertakes bathymetric surveys to provide information and reports to clients about water bodies using remotely operated survey technology.
Clients require water storage information for a wide range of purposes, including reporting to Government agencies for water balance models, pre-wet season inspection reporting as well as water management planning and modelling for operational purposes. Operationally, water storage capability on any given industrial or mining site is critical information. It is often used for mitigation planning for adverse weather events, water availability monitoring for product processing, treatment of poor water quality in selected storages and water availability for on-site activities such as dust suppression.
Often sediment build up in constructed water storages can impact the capacity greatly, and Bathymetric Surveys can be a cost effective way of understanding the sediment content and volume characteristics of water storages compared to the original ‘as built’ or previous surveys.
Safety is the highest priority for ALS, and the Remote Control ‘Q Boat’ (Survey Boat) can be fitted with a range of Echo Sounder and Acoustic Doppler instrumentation, dependent upon the application, with integrated Differential or RTK survey base station units, providing accurate depth information and location survey data.
The use of the remote controlled equipment enables the survey to be conducted in potentially unsafe areas such as close proximities to Mine Pit high walls and operationally sensitive areas where personnel safety would be compromised.
Extensive Range of Technologies for Bathymetric Survey
ALS Hydrographics has extensive experience conducting bathymetric surveys on natural water bodies and constructed dams, including plastic lined dams and disused mining pits for a range of clients in varying industries. Through use of remote control equipment, sub-centimetre accuracy can be achieved. Using Real Time Kinematic (RTK), Differential survey instrumentation and Echo Sounder and
Acoustic Doppler Current Profiling (ADCP) multi-beam instruments, ALS can survey, map, model and determine existing volumes and capacities. Additionally, ALS Hydrographics can utilise data such as pre-existing surveys and LiDAR and merge survey data to provide customised outputs covering the whole range of storage levels.
ALS has the full capability to undertake all aspects of the surveys, including both water and land based surveying, raw data modelling, data provision and reporting. ALS can provide a range of data outputs, including but not limited to; 3D models, 2D topographical plots, storage curves and tables, raw survey or modelled data in various survey software formats for import and use post bathymetric survey. ALS can individually tailor a survey project to meet client requirements including identifying the required data, conducting the survey and reporting on specific test components. If you have Bathymetric Survey requirements, or would like additional information relating to possible survey projects please email ALS Hydrographics at firstname.lastname@example.org.
Autonomous Vehicles and Their Use in Early Detection of WQ Tolerance Triggers
Traditionally in Sydney’s water supplies, during and after a large runoff event, the tracking of water quality parameters is hindered by several factors. These include stringent safety protocols whilst storage is spilling and a lack of resources due to the associated heavy workload. The introduction of autonomous vehicles customised to perform these monitoring task remotely, reduces the time burden on staff and eliminates safety concerns.
Measuring the quality of raw water supplies is very important in ensuring the final treated water is of the highest quality and safe to drink 100% of the time for operators.
There are many parameters which are measured to ensure the water is of a high quality. Some of these parameters are measured for aesthetic purposes, such as colour and hardness, others are measured for health reasons, such as E. coli contamination. The requirement for operators to have access to this information on a near real time bases has become the norm. Current expectation is that data will be available real time, and most importantly during extreme weather events. The use of Autonomous Underwater Vehicles (AUV) is seen as an efficient means of collecting data during a challenging time for businesses particularly when resources are strained or safety concerns arise.
AUVs have come a long way in recent years. Underwater vehicles have become efficient, reliable and affordable platforms for performing various underwater tasks. The vehicle can augment existing water quality monitoring programs that use instruments at fixed locations and even replace costly monitoring programs using small vessels.
The AUV missions can be planned using Windows®-based software that allows the users to plan directly onto geo-referenced map files of the field sites. The vehicle route is drawn directly on the map files, utilizing selectable settings such as vehicle speed, vehicle depth (distance from surface or distance from the bottom), and way-point designation (where the vehicle can surface for data download). This takes about 10-15 minutes.
This type of data provides valuable information on the distribution of various water quality parameters in a surveyed area. The operator determines the spatial resolution, but it is significantly higher than surveys conducted from boats. The vehicle’s ability to undulate in the water column also provides vertical mapping in addition to horizontal mapping, resulting
in 3-D profiles.
The AUV can be deployed and provided a mission by one operator. Once deployed the operator is able to then perform multiple other tasks during event conditions.
ALS Staff are well trained and equipped to perform tasks on water during extreme conditions, however, we endeavour to identify avenues to ensure staff safety and continue to collect good quality data using more efficient methods.
The benefits of using such a platform include:
- Efficiencies in the utilisation of staff resources,
- Improved collection of Real time Water Quality data,
- Ability to set missions remotely to track changes in reservoir conditions,
- Allowing data to be collected at a times of extreme weather conditions and possible closure of sites to manned vessels,
- Reduction in staff numbers required to carry out typically labour intensive tasks, and
- Removal of hazardous situations for staff working on water during spill events.
ALS has extensive experience in the design, planning, testing and operating water monitoring tasks with autonomous vehicles.