There are direct method and indirect method in bedload measurement. It is possible to surely measure in direct method. But the work of this method is the labor, and the measurement is not possible in the long]term. In the other, the work by indirect method with sensor is easy, and long]term measurement is possible. Therefore, the expectation which is caught in indirect method is big. But there is a study case of this method only on hydrophone. There seems to be some the necessity of investigating the usefulness of the sensor by trying bedload measurement using other sensor. And then, we tried bedload measurement using impulse radar system. In this study, the experiment which confirmed the relation of concentration of sediment which flows in flume and signal strength was carried out. It was proven that there was the clear and positive correlation from the experimental result to both. Therefore, there was the possibility of bedload measurement using radar.

Key wordsFbedload, bedload measurement, hydrophone, impulse radar, permittivity, signal strength