Safety Monitoring of Dams, Levees, & Embankments Adapted from Information by Dam Safety Group A wide range of geophysical and seismic techniques, services, and technologies are available to address noninvasive investigation, monitoring, and maintenance of dams, embankments, and levees. Some of these proven solutions are offered by IRIS Instruments, GEOMETRICS, GSSI, ROBERTSON GEO, and KINEMETRICS. IRIS Instruments provides valuable information about the dam structure’s internal integrity to locate points of failure in real time or with time acquired monitoring. Using resistivity and polarization imaging of the topography and slopes in three dimensions helps to predict potential landslides and related overtopping risks. IRIS Instruments SYSCAL PRO Switch resistivity meter & Full Waver Systems provide dimensional imaging for technicians and service providers for dam issue predictability and longer term monitoring for remedial work. Technologies include the following: R Multichannel electrical resistivity imaging (2D & 3D) to define integrity of dams and locate potential points of failure R Monitoring dam seepage, water saturation, piping, and leakage paths R 3 dimensional characterization and monitoring of dam slopes R 2D & 3D imaging of lateral dam slopes to prevent potential landslide risk of over topped dams GEOMETRICS seismic instruments are essential for any subsurface investigation. Traditional wired systems or the newest wireless Atom system can be deployed in almost any location for detecting faults and evaluating geotechnical and soil conditions. Seismic tomography includes: R Characterizing ground conditions in terms of shear wave velocity, rippability, bedrock mapping, and soil condition R Identifying faults and related structures R Soil type in levees R Active and passive surface wave techniques GSSI provides ground penetrating radar (GPR) to inspect infrastructure systems nondestructively, providing a quick and high-resolution survey option: R Nondestructive imaging of the subsurface and manmade materials R Characterizing internal structures R Detection of cavities R Concrete inspection and geotechnical investigation of dams, earthen levees, and embankments R Reservoir and stilling basin examination ROBERTSON GEO developed wireline borehole logging instrumentation, technologies, and techniques for investigation and interpretation of hydrological projects. These technologies provide reliable, calibrated subsurface data essential throughout the life of the dam: R Characterizing ground elements in terms of condition, stiffness, fractures, and rock characteristics R Gaining an understanding of the groundwater conditions R Investigating the condition of existing structures associated with dams KINEMETRICS’ innovative vertical product lines, such as iDAM, Oasis, and condor, are specialized systems addressing structural health: R Monitoring earthquake activity and its effect on a dam’s structure R Providing installation, training, maintenance, operational support for very high system availability R Assessing the seismic stability and deformation for geotechnical structures R Quantifying the soil effects for seismic analysis and design The Dam Safety Group’s member companies use proven geophysical technology, services, and products for dam site investigation and monitoring, as well as seismic monitoring via earthquake early warning and evaluation systems. The resulting data allows evaluation of hydrological, geological, and construction issues in a cost effective way. C&G 7 FEBRUARY 2022 WorldWide Drilling Resource® Royal Eijkelkamp’s data loggers are designed to collect, monitor, and transmit data in a powerful, efficient manner in a wide range of temperatures and operating conditions. These devices combine affordability, reliability, and accuracy, providing easy-to-read data acquisition and interpretation. Various models are available with two different advanced types of wireless technologies: RF nodes with gateways and GSM/GPRS data loggers. Wireless monitoring solutions can connect a wide range of multiple geotechnical sensors and instruments using an SDI-12 digital interface.
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