Measurement of cavitation bubble cluster downstream of sheet cavity

1.北冰洋的气象数据来自ECMWF和日本气象厅。海冰分布的卫星遥感数据来自NSIDC，这些数据来自安装在美国DMSP卫星上的SSM/I传感器.由于海流资料非常有限，我们进行了基本的实验，使用旋转水槽和数值模拟相同的条件下，考虑使用数值模拟技术。实验电流显示出相同的模式，在北冰洋观测到的表面电流，这表明河流径流沿沿着西伯利亚和阿拉斯加海岸的影响是显着的。多层模式的数值模拟结果也显示了同样的规律，表明该程序可以用于北冰洋海流的预报.所有采集的数据都被转换成ArcView GIS数据库格式。因此，查看和分析数据变得很容易。4.利用本研究开发的地理信息系统数据库系统对北冰洋海冰进行了分析。虽然整个冰场的变化主要受风和气温的影响，但部分地区的海冰运动非常复杂。这样，就可以提取每个海区的海冰变化特征.开发了几个接口程序，将地理信息系统与海冰变化预测程序连接起来。因此，开发了一个数据、地理信息系统和预测计算的综合系统。利用该系统进行了海冰变化预测计算，验证了该系统的有效性。

1. Meteorological data on the Arctic Ocean were obtained from ECMWF and Japan Meteorological Agency. Sea ice distribution data measured by satellite remote sensing were obtained from NSIDC.These data are of SSM/I sensor, which is installed on the US DMSP satellite.2. Since sea current data is very limited, we performed fundamental experiments using a rotating tank and also numerical simulation with the same condition, considering to use numerical simulation technique. The experimental current showed the same pattern as the observed surface current in the Arctic Ocean, suggesting that the effect of river run-off along the Siberian and Alaska coasts is significant. The numerical simulation using multi-layer model also showed the same pattern, suggesting that this computer program can be applied to predict the Arctic Ocean current.3. All of the collected data were transferred into ArcView GIS database format. Because of this, it has become easy to view and analyze the data.4. The GIS-database system developed in this research was used to analyze the sea ice in the Arctic Ocean. Although the whole ice field changed mainly due to wind and air temperature, some areas showed very complicated sea ice motion. As such, the characteristics of sea ice change can be extracted for each sea area.5. Several interface programs were developed to connect the GIS and sea ice change prediction programs. As a result, an integrated system of data, GIS and prediction computations was developed. Using this system, we executed sea ice change prediction computations, confirming the effectiveness of this system.