2012 年 68 巻 4 号 p. I_763-I_768
This study focuses on the problem of "mosquito swarm" along urban rivers. Different from general biological methods (capture, counting and photograph), we adopted a fluid dynamical approach to investigate the temporal-spatial distribution of mosquito swarm. First, a novel device composed of multiple laser sheets is developed as a mosquito counter in order to quantify the density of the swarm. Second, filed observations are done in Nomi River by utilizing this laser device as well as the other conventional meteorological observations. The followings are the major results obtained: (1) Mosquito swarms are apparent only about 1 hours before the sunrise heavily on one-sided (sunlit side) along the river. (2) The hot-sopt of mosquite swarm seems to exist ; the cross sections of urban street perpendicular to the river. The locations were roughly fixed with slight perturbations. (3) The suitable temperature to make swarm is about 22.5ºC.
