Research on the evolution of rain cells at the Nagasaki Peninsula and the disaster due to the heavy rainfalls at the Shimabara Peninsula

长崎半岛雨团演化及岛原半岛强降雨灾害研究

• 批准号: 08640548
• 负责人: ARAO Kimio
• 金额: $ 1.41万
• 依托单位: Nagasaki University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08640548/
• 关键词: Meteorological rader; Convective rainfall; Nagasaki Peninsula; Effects of valley; Shimabara Peninsula; Volcanic debris flow

The Chiji Valley at the Nagasaki Peninsula in Nagasaki Prefecture is a very deep valley which is open to the south direction, and can be inferred as a role of topographical effect of convective rainfall generation. The rain storms evoluted near the Nagasaki Peninsula often move towards to the Shimabara Peninsula and sometimes occure the velcanic debris flows around the Unzen-Fugendake Volcano.The main purpose of this study is to observe the evolution and development process of the rain cells at the Nagasaki Peninsula. The results obtained in this study are as follows ;(1) The line-shaped rain echoes, which extended from the Higashi-Nagasaki area to the Isahaya Bay region and lasted as long as ten hours or more, were observed by the RHI radar of Nagasaki University at July 2 and July 11 both in 1995. These very characteristic and significant rain echoes appeared under the same atmospheric condition that the warm and humid south wind from the sea prevails over Nagasaki area. This conditi … More on strongly suggests the enhancement of the vertical motion by a deep valley.(2) The line-shaped and long-lasting echoes almost same as the above cases. were observed frequently in the monsoon seasons in l996 and 1997. All the atmospheric conditions ge*nerated these echoes can be characterized as the south wind at surface. In addition to this significant radar echoes, the scond and third line-shaped echoes with relatively weak intensity were observed in a parallel direction with the main echoes. Since these weak linear echoes are also corresponding to small valleys open to the south, the appearance of these second and third echoes strongly supports the hypothesis of the valley effects at the Nagasaki Peninsula.3) The disastrous debris flows aroud Mt.Unzen were decreased according to the silence of the volcanic activity and the contruction of dams. In spite of this, the careful watch for heavy rainfalls can be still needed, because the vlcanic debris flows have taken place frequently in the riverbed. Less

长崎县长崎半岛的千地谷是一个向南开放的非常深的山谷，可以推断为对流降雨产生的地形效应的作用。在长崎半岛附近形成的暴雨经常向岛原半岛移动，有时还会形成云禅宗-富根ake火山周围的火山碎屑流。本研究的主要目的是观察长崎半岛雨单体的演变和发展过程。本研究得到的结果如下：(1) 1995年7月2日和7月11日，长崎大学RHI雷达观测到从东-长崎地区向伊撒哈耶湾地区延伸的线状雨回波，持续时间长达10小时以上。这些极具特征和显著的降雨回波是在暖湿南风盛行于长崎地区的同一大气条件下出现的。这一条件更有力地表明深谷对垂直运动的增强。(2)线状、持久的回声与上述案例基本相同。于一九九六年及一九九七年的季风季节频繁出现。产生这些回波的所有大气条件都可以表征为地面南风。除了这种显著的雷达回波外，在与主回波平行的方向上还观测到强度相对较弱的第二、第三线形回波。由于这些微弱的线性回波也对应于向南开放的小山谷，因此第二次和第三次回波的出现有力地支持了长崎半岛山谷效应的假设。3)由于火山活动的沉寂和大坝的建设，云仙山周围的灾难性泥石流减少了。尽管如此，仍然需要仔细观察强降雨，因为火山碎屑流经常发生在河床上。少

项目成果

Arao, K.et al.: "A case study of structure and evolution of the ash cloud derived from Unzen pyroclastic flow using radar data (in Japanese)" Kazan. Vol.41, No.4. 149-158 (1996)

Arao, K.等人：“利用雷达数据对云仙火山碎屑流产生的火山灰云的结构和演化进行案例研究（日语）”Kazan。

荒生公雄ほか: "長崎県高来町周辺に豪雨をもたらした1995年7月11日の雷雨" 長崎大学教育学部自然科学研究報告. No.56. 13-24 (1997)

Kimio Arao等：“1995年7月11日，长崎县高木町周围发生暴雨”，长崎大学教育学部自然科学研究报告，第56. 13-24号（1997年）。

荒生 公雄ほか: "雲仙岳周辺に火山性土石流を発生させた1995年の豪雨" 長崎大学教育学部自然科学研究報告. No.57. 13-26 (1997)

Kimio Arao等：“1995年大雨导致云仙山周围的火山泥石流”，长崎大学教育学部自然科学研究报告第57号（1997年）。

Arao, K.et al.: "Features of the convective rainfall system over the northern area of Shimabara Peninsula on 18 November 1994 (in Japanese)" Science Bulletin of the Faculty of Education, Nagasaki University. No.54. 7-20 (1996)

Arao, K.等：“1994年11月18日岛原半岛北部地区对流降雨系统的特征（日语）”长崎大学教育学院科学通报。

荒生 公雄ほか: "島原半島を通過した1994年11月18日の対流性降雨の活動特性" 長崎大学教育学部自然科学研究報告. No.54. 7-20 (1996)

Kimio Arao等：“1994年11月18日经过岛原半岛的对流降雨的活动特征”，长崎大学教育学部自然科学研究报告第54. 7-20号（1996年）。