Study on improvements of cloud microphysics modeling and control of artificial cloud generation in the huge vertical shaft

巨型竖井人工云生成云微物理建模及控制改进研究

• 批准号: 14350270
• 负责人: YAMADA Tadashi
• 金额: $ 8.45万
• 依托单位: CHUO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350270/
• 关键词: Aerosol; Experiment of cloud microphysics; Cloud microphysics model; Updraft velocity; Artificial rainfall; Numerical simulation; Chemical composition; Condensation growth; エアロゾルの化学成分

Actual scale experiment of cloud microphysics in mine was carried out. This study aims at revealing cloud microphysical mechanism of generation and development processes of cloud and rainfall. In this experiments, large size fan which generate updraft was placed on the top of vertical shaft and clouds are generated artifitially by controlled updraft. Moreover, several kinds of solution are sprayed at the bottom of vertical shaft. This make it possible to controll chemical composition, solution consistency and number density of aerosol flowing into the vertical shaft. Experiment result such as vatiation of meteorological elements with height and changes in air condition at phase change from vapor to cloud particle could have been obtained. Those experimental data have compared with simulation results by newly developing rainfall simulation model by our research group, which consider effects of aerosol in the air.Following results have been obtained by experiment during reserach period.1 … More .Experiment controlling inflow air (auch as aerosol number denisty, velocity of updraft) into vertical shaft :(1)Vertical dsitribution of aerosol number density were measured. Increase of number densityaround elevation of cloud base are observed. Additionally, condensational growthing process of cloud particle as those flow up in vertical shaft were observed. (2)In case of spraying solution at the bottom of vertical shaft, the number of particles with small diameter increase at the top of shaft, meanwhile the number of particles with large diameter decrease. (3)As aerosol number density spraied at the bottom increase, amount of generated cloud water also increase. However, if number denisty of aerosol is too much, amount of generated cloud water intends to converge to constant value. (4)Amount of cloud water increase as updraft velocity is high. Then relations between amount of cloud water and updraft velocity is linear.2.Temperature distribution in vertical shaft are different before and after generation of cloud. Temperature lapse rate at elevations higher than cloud base is smaller that saturated-adiabatic lapse rate after cloud generation. This measurement result could not be duplicated by existing simulation model. On the other hand, this phenomena could be duplicated by our newly developed simulation model considering effect of aerosol. Less

进行了矿井云微物理的实尺度实验。本研究旨在揭示云和降水发生发展过程的云微物理机制。在实验中，在竖井顶部放置了一个能产生上升气流的大型风扇，通过控制上升气流来人工造云。此外，在竖井底部喷洒了多种溶液。这使得控制流入竖井的气溶胶的化学成分、溶液浓度和数密度成为可能。实验结果表明，在水汽向云粒子相变过程中，气象要素随高度的变化以及空气条件的变化。将这些实验数据与本课题组新开发的考虑空气中气溶胶影响的降雨模拟模型的模拟结果进行了比较，研究期间通过实验得到了以下结果：1 ...更多信息 控制竖井入风流（气溶胶数密度、上升风速）的实验：（1）测定了竖井入风流气溶胶数密度的垂直分布。观测到云底高度附近数密度增加。此外，还观察到了云粒子在竖井中上升时的凝结增长过程。(2)In在竖井底部喷淋时，竖井顶部小粒径颗粒数量增加，大粒径颗粒数量减少。(3)As底部喷洒的气溶胶数密度增加，云水生成量也增加。当气溶胶数密度过大时，云水生成量趋于恒定。（4）上升气流速度越大，云水越多。云水量与上升气流速度呈线性关系。2.垂直井筒内的温度分布在云生成前后是不同的。云生成后，高于云底高度的温度直减率小于饱和绝热直减率。这一测量结果无法被现有的仿真模型所复制。另一方面，这种现象可以通过我们新开发的考虑气溶胶影响的模拟模型来复制。少

项目成果

土屋 修一: "降雨の時間特性に関する研究"水工学論文集. 第47巻. 139-144 (2003)

土屋秀一：“降雨的时间特征研究”水利工程学报第47卷139-144（2003年）。

Assela PATHIRANA: "Idealized Simulation of Airflow over a Mountain Ridge Using a Mesoscale Atemospheric Model"水工学論文集. 第47巻. 31-36 (2003)

Assela PATHIRANA：“使用中尺度大气模型对山脊上的气流进行理想化模拟”，《水利工程杂志》，第 47 卷，31-36 (2003)。

武内 慶了: "複断面開水路流れにおける大規模水平渦の発生と発達"水工学論文集. 第47巻. 475-480 (2003)

Yoshiaki Takeuchi：“多断面明渠流中大规模水平涡流的产生和发展”水利工程学报，第 47 卷，475-480（2003 年）。

Studies on Temporal characteristics of Rainfall

降雨时间特征研究

• 发表时间: 2003
• 期刊: Annual Journal of Hydraulic Engineering JSCE Vol.47
• 作者: 金 庚玉;山下隆男;Shuichi Tsuchiya
• 通讯作者: Shuichi Tsuchiya

実スケール雲物理実験によるエアロゾル粒子の凝結成長と雲水量の関係

通过真实规模的云物理实验研究气溶胶颗粒凝结生长与云含水量之间的关系

• 发表时间: 2005
• 期刊: 第32回土木学会関東支部技術研究発表会講演概要集 II-1-27(CD-ROM)
• 作者: 笹尾 将登