Study on Environmental Pollution Mechanism of Mt.Sakurajima Volcano Ash

樱岛火山灰环境污染机理研究

• 批准号: 03650426
• 负责人: HIRANO Muneo
• 金额: $ 1.41万
• 依托单位: KYUSYU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650426/
• 关键词: Volcanic Ash; Traveling Length; Size Distribution of Bed Material; Suspended Particle; Debris Flow; Turbulent Shear Flow; Environmental Pollution; Numerical Simulation; 数値シミュレ-ション

Mt.Sakurajima volcano is the most active one in Japan.and has been erupting large amount of volcanic ash around the mountain.The deposited volcanic ash on the mounainside results in debris flow in the rivers caused by heavy rainfall.Assuming that a particle erupted from the crater into the air falls at its terminal velocity,a theoretical equation which gives the depositing rate of volcanic ash and the distribution of grain size on the ground was obtained.A parametric model to predict the hydrograph of debris flow was offered,in which the distribution of slope length and the depth of the deposited volcanic ash were introduced.The parameters of the model are the mean and standard deviation of the depth of deposits,the hydraulic conductivity,and the lag time in the stream,which are identified by use of the Simplex method.The applicability of this model was checked by the data from two rivers in Sakurajima Volcano.

樱岛火山是日本最活跃的火山。并一直在火山周围喷发大量的火山灰。在山腰上沉积的火山灰造成了暴雨导致的河流泥石流。假设从火山口喷发到空中的粒子以其最终速度下落，得到了火山灰沉积速率和地面颗粒尺寸分布的理论方程。提出了一种预测泥石流流线的参数化模型，其中引入了坡长和沉积火山灰深度的分布。该模型的参数为沉积物深度、水力导率和水流滞后时间的均值和标准差，并采用单纯形法进行识别。利用樱岛火山两条河流的数据验证了该模型的适用性。

项目成果

木藤 賢一、橋本 晴行 平野 宗夫: "急勾配水路における乾燥紛体流の特性" 水工学論文集. 37. 617-622 (1993)

Kenichi Kifuji、Haruyuki Hashimoto、Muneo Hirano：“陡坡水道中干粉流动的特性”水利工程学报 37. 617-622 (1993)。

大本 照憲、平野 宗夫: "縦渦列の安定機構とその制御について" 水工学論文集. 37. 495-502 (1993)

Terunori Omoto、Muneo Hirano：“论纵向涡街的稳定机制及其控制”水利工程学报 37. 495-502 (1993)。

大本 照憲、平野 宗夫、天野 光歩、松尾 誠: "河川合流部の大規模渦構造と河床形状" 水工学論文集. 36. 373-378 (1992)

Terunori Omoto、Muneo Hirano、Mitsuho Amano、Makoto Matsuo：“河流交汇处的大型涡流结构和河床形状”水利工程学杂志 36. 373-378 (1992)。

Muneo HIRANO,Haruyuki Hashimoto,HIRANO,Toshiyuki MORIYAMA: The Nishinippon Shinbun and Kyusyu University Press. "Debris Flow at Mt.Fugen",in Unzen Volcano the 1990-1992 Eruption, 137 (1992)

平野宗夫、桥本春之、平野、森山敏之：西日本新闻社和九州大学出版社。

Terunori OHMOTO,Muneo HIRANO: "Effects of Secondary Currents on Suspended Sediment Concentration" The Tenth Symposium on Multiphase Flow. 73-76 (1991)

Terunori OHMOTO、Muneo HIRANO：“二次流对悬浮泥沙浓度的影响”第十届多相流研讨会。