Modification of Typhoon 7002 Rainfall by Orographic Effect

[摘要] A case study of the rainfall during the passage of Typhoon 7002 over the Kii Peninsula is made on the assumption that the rainfall R(x, y, t) at each station (x, y) should be interpreted as k(x, y)×f(x, y, t), where f(x, y, t) is the rainfall which would be caused at the station by the traverse of a disturbance if there were no orographic effect and k(x, y) is the amplification factor of the rainfall which would be dependent upon the topographic features around the station and the direction and strength of prevailing wind. The results of analysis show that the distribution of h(x, y, t) whish is roughly proportional to f(x, y, t) and its behavior have a good correspondence to the distribution of moving radar echoes, while the distribution of R (x, y, t) is considerably controlled by topographic features over the peninsula. Examples of the pattern of k(x, y) and f(x, y, t) over the peninsula are presented.

[学科分类] 大气科学