講演情報
[AAS14-P06]Theoretical consideration for portable doppler radar raingauges
*稲津 將1、小野村 志穂2、坂口 竜太5、三瓶 祐翔1、南光 一樹4、濱田 篤3 (1.北海道大学、2.東京都市大学、3.富山大学、4.東京農工大学、5.八千代エンジニヤリング株式会社)
キーワード：
降雨観測、粒子法、マイクロ波
This study explored the theoretical basis for the newly developed portable doppler radar raingauge, a compact microwave radar system that detects water droplets impinging on a capsule-shaped shield. First, the design of the device was derived from voltage data obtained through both laboratory experiments and field observations. Based on this, a simple empirical method for converting the voltage data to rainfall intensity was established using statistics of high-pass-filtered signals. Next, we simulated the movement and deformation of raindrops, of which size follows a Gamma distribution, onto a hemispherical sensor surface using the Moving Particle Simulator (MPS). Furthermore, for representative drop sizes observed in the simulation, we calculated the scattering of microwaves using the Finite-Difference Time-Domain (FDTD) method. As a result, the values calculated by the MPS and FDTD methods showed consistency with the empirically derived equation, thereby supporting its utility.