Mapping pollution and coastal hydrogeology with helicopterborne transient electromagnetic measurements

Karst Hydrogeology and Geomorphology

Mapping Spatial Variability of Soil Salinity in a Coastal Paddy Field Based on Electromagnetic Sensors

In coastal China, there is an urgent need to increase land area for agricultural production and urban development, where there is a rapid growing population. One solution is land reclamation from coastal tidelands, but soil salinization is problematic. As such, it is very important to characterize and map the within-field variability of soil salinity in space and time. Conventional methods are ...

Optimal Electromagnetic Measurements

We consider the problem of obtaining information about an inaccessible halfspace from electromagnetic measurements made in the accessible half-space. If the measurements are of limited precision, some scatterers will be undetectable because their scattered fields are below the precision of the measuring instrument. How can we make optimal measurements? In other words, what incident fields shoul...

Air Quality and Pollution Mapping System, Using Remote Measurements and Gps Technology

According to the actual European context, including the development of risk free residential and industrial areas, the main demand lies in instant, accurate and elaborated information regarding environment quality and pollution risks. This paper presents a conceptual architecture for a versatile, flexible, cost efficient, highspeed instrument for monitoring the air quality. In order to cover a ...

A Transient Electromagnetic Flowmeter and Calibration Facility

Flowmeter and Calibration Facility P.J. Lefebvre Naval Underwater Systems Center, Newport, R.1. An electromagnetic flowmeter was developed to measure transient flows at a data rate of 60 Hz. The approach taken was to develop suitable electronics to replace the electronics ofa commercially available electromagnetic flowmeter normally used W. W. Durgin for steady-state operation. Use of the comme...