Case Studies

HydroSurveyor Enables Rapid Indian Railways Bridge Surveys

The HydroSurveyor-M9 system from SonTek, a Xylem brand, is an instrument/technology that Indian Railway has employed to rapidly measure bathymetry data along with velocity data. The HydroSurveyor is a multi-frequency acoustic Doppler current profiling system (ADCP) equipped with nine acoustic beams, five of which are used to survey at any one time; four slanted beams provide a velocity profile from up to 128 cells as well as measure depth, and then there is a vertical beam with an 80m range which measures the depth directly below the system.

App Note: CTD Montitoring Technology Helps Reveal Arctic Secrets

A group of Arctic researchers has employed the latest monitoring technology to investigate the effects of climate change, by measuring temperature and salinity in the water column beneath surface ice. The results of the investigation, which utilised SonTek’s new CastAway-CTD™ instrument, could cast new light on our understanding of the ways in which shifting ocean currents impact the climate in northern Europe.

Exploring Eelgrass - Shallow Water Beds Capture CO2

Climate Change and Eelgrass Study Carbon dioxide levels in the atmosphere have increased by about one-third since the start of the Industrial Revolution, from about 300 parts per million (ppm) to about 400 ppm. About one-third of the atmosphere's carbon dioxide dissolves into the ocean. As dissolved carbon dioxide levels have increased, the earth's seawater has become about 30 percent more acidic. "Like many green plants, eelgrass grows faster as carbon dioxide levels increase," notes California Sea Grant Extension ecologist Joe Tyburczy at Humboldt State University in Eureka, California. "But unlike green plants that grow on land, eelgrass takes up CO2 directly from the seawater."

App Note: Palm-sized CastAway-CTD Reveals Complex Dynamics in a Small Harbor

The Mexican Institute for Water Technology (IMTA) had big questions to answer as it studied plans for the expansion of the Port of Manzanillo, an important container shipping center on Mexico’s Pacific coast. The port authority received permission to upgrade the harbor on the condition that it restore an adjacent lagoon, cut off from the rest of the harbor by a road embankment decades ago.

Case Study: Determining Total Volume of Sludge in Wastewater Ponding Lagoons

Surveys were performed of three Wastewater Ponding Lagoons and a TWM storage lagoon at Kalgoorlie-Boulder Wastewater Treatment Plant (WWTP) to determine the total volume of sludge. The volume of sludge at each lagoon was calculated based on surface elevation model developed from land survey and as-build drawing. The equipment chosen for the surveys consisted of two Global Navigation Satellite System (GNSS) receivers, CEE HydroSystems CEESCOPE with dual frequency echo sounder and rQPOD with autonomous navigation. The survey software utilized during the surveys consisted of HYPACK® Hydrographic Survey and Carlson SurvCE software.

Case Study: Closing the Gates - Monitoring and Ingenuity Help Lousiana Communities Battle Storms

Flood Control Gate System The federal government saw the need for a flood control system through Terrebonne (Louisiana) and neighboring parishes, and in 1992, began a study to map out a project. Congressional acts in 2007 and 2014 resulted in authorizations for a $10.8 billion plan—dubbed the Morganza to the Gulf Hurricane Protection System after the town that marks its projected starting point— but the government never funded the projects. Closely monitoring stage and flow in real-time with instruments such as the SonTek-SL has allowed the levee district team to see the dramatic effects of landscape, wind, and tide on surges across the parish.

Case Study: Tidal Energy Feasibility in Larantuka Strait using SonTek Argonaut XR

The Republic of Indonesia is a vast archipelago with over 17.508 officially listed islands. The physical oceanographic characteristics in Indonesian waters lends itself to many opportunities for potential tidal current energy developments and feasibility studies, and continues to be undertaken to determine the commercial viability of constructing tidal power plants.

Case Study: Establishment of a Hydrographic Monitoring Site in Australia

SonTek-SL1500 Xylem Water Solutions were appointed by Local Government in Bundaberg to establish hydrographic monitoring site in Bundaberg Creek, just upstream of the confluence with the Burnett River. The monitoring objectives at the hydrographic monitoring site consisted of surface water level and flow measurement in real-time available through cloud based hydrological information management system (HIMS). Part of the initial site establishment consisted of performing detailed bathymetric survey of the Bundaberg Creek from upstream the Quay St Footbridge up to the confluence of the Burnett River for hydraulic analysis of the channel.

Case Study: Remote Bathmetric Survey in Kalgoorlie Mine Pits, Australia

Previously, volume surveys of impounded waters in pit lakes had been undertaken using Total Station positioning and soundings taken froma boat on the lake. This was a labour intensive process with up to four people required for the survey. In addition to this was the safety concerns associated with working on the water in boats. Kellie Carter, Senior Environmental Advisor, approached Xylem regarding any possible solutions to make this process more efficient.
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