『Abstract
　A considerable proportion of the world population lives and work on or near coasts. Therefore, knowledge of the physical processes which affect the coast is very important. These include the tides of the sea and the oceanic and meteorological circulation patterns that cause variations of the sea level and generate waves. The sea level is measured by tide-gauges, while the height of waves may be determined by a variety of special devices. Radar systems have been applied for the sea level and wave measurements since the late 1990s. This paper presents results from a field test or such a radar application and aims to give the reader help and support in the selection of an appropriate radar-gauge system to measure sea level and sea state. The underlying physical principles of radar and its application in distance measurements are not subjects of this paper.

Keywords: Hydrometry; Gauging station; Sea level; Water-measuring device; Radar-gauge』

Introduction
The field test of radar sensors
Conclusion and outlook
Acknowledgments
References