Russian Federation
Russian Federation
Russian Federation
Russian Federation
Russian Federation
Purpose. The purpose of the study is to describe a prototype of a string wave gauge for dynamic record of wave elevations in salt and fresh water in a wide range of wavelengths up to capillary ones, which should be both insensitive to salt deposition on the conducting wire and free from short circuits caused by conductive debris. The prototype is required when developing unattended wave gauge “grids” in-tended for recording two-dimensional wave spectra and for accompanying of sea wave studies with remote methods for interpretation and validation of remote sensing data. Methods and Results. A capacitive string wave gauge with a shielded wire in the form of a closed two-wire loop as a “string” for recording water surface elevations in salt and fresh water is presented. The advantage of a shielded wire as compared to a conductive one is the absence both of a decrease in its sensitivity due to salt deposition on the conductive wire and short circuits from small conductive debris. The wave gauge has a large linear dynamic range and can record the waves from millimeters to several meters high in salt and fresh water. During operation, there is no need to clean the wire; the wave gauge can be in water for a long time without losing sensitivity and with no temperature-related signal “drifts”. Conclusions. The description and scheme of the wave gauge operation is presented, as well as the de-sign of its features and the results of testing in river and sea conditions are discussed. The impact of distance between the "strings" upon the device effectiveness in salt and fresh water is studied in labora-tory conditions. For a multi-string design, a scheme for eliminating mutual interference of the wave gauge "strings" is developed. The proposed measurement scheme implies mounting the control unit of string wave gauge at a height of several dozens of meters from the "strings". It permits to install con-veniently the wave gauge above water in order to carry out the measurements from a bridge or a sea platform.
surface waves, wave height, gravity-capillary waves, water level, string wave gauge, in-situ measure-ments
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