针对传统大数据流式计算平台节能策略并未考虑数据处理及传输的实时性问题,首先根据数据流处理的特点与storm集群的结构,建立有向无环图、实例并行度、任务资源分配与关键路径模型。其次结合拓扑执行关键路径与系统性能的分析,提出一种s...针对传统大数据流式计算平台节能策略并未考虑数据处理及传输的实时性问题,首先根据数据流处理的特点与storm集群的结构,建立有向无环图、实例并行度、任务资源分配与关键路径模型。其次结合拓扑执行关键路径与系统性能的分析,提出一种storm平台下工作节点的内存电压调控节能策略(WNDVR-storm,energy-efficient strategy for work node by dram voltage regulation in storm),该策略针对是否有工作节点位于拓扑执行的非关键路径上设计了2种节能算法。最后根据系统数据处理及传输的制约条件确定工作节点CPU使用率与数据传输量的阈值,并对选定的工作节点内存电压做出动态调整。实验结果表明,该策略能有效降低能耗,且制约条件越小节能效率越高。展开更多
通过中尺度气象研究与预报模式WRF(weather research and forecasting)和两种台风经验模型重构了2018年影响我国珠江口地区的超强台风“山竹”过程中的气压和风矢量场,在台风最佳路径数据的基础上开展了方法间的比较,并与香港、澳门和...通过中尺度气象研究与预报模式WRF(weather research and forecasting)和两种台风经验模型重构了2018年影响我国珠江口地区的超强台风“山竹”过程中的气压和风矢量场,在台风最佳路径数据的基础上开展了方法间的比较,并与香港、澳门和深圳三个国际机场的实测数据进行了对比分析,验证了三种模拟方案模拟台风“山竹”的可靠性。利用非结构网格半隐式跨尺度海洋模式SCHISM(semi⁃implicit cross⁃scale hydroscience integrated system model),将三种模拟气压和风场作为驱动场输入风暴潮模式中进行增水模拟试验,比较了它们在赤湾、三灶、横门和黄埔四个测站风暴潮增水中各自的效果,并进一步验证了WRF模式和两种经验模型模拟台风“山竹”的有效性。综合来看,WRF大气模式对气压、风速、风向及风暴增水模拟效果最佳,如果进一步优化该模式的各种参数化方案,可能还能提高其精度。如果不具备使用WRF大气模式的条件,台风经验1模型也是一个完全可以接受的、简单快捷的方案。展开更多
A typhoon-induced storm surge simulation system was developed for the Qingdao area, including a typhoon diagnostic model for the generation of wind and pressure fields and a 2D Advanced Circulation(ADCIRC) model for s...A typhoon-induced storm surge simulation system was developed for the Qingdao area, including a typhoon diagnostic model for the generation of wind and pressure fields and a 2D Advanced Circulation(ADCIRC) model for simulating the associated storm surge with a 200 m resolution along the Qingdao coastline. The system was validated by an extreme surge event Typhoon Mamie(8509) and the parameters of Typhoon Mamie were used to investigate the sensitivity of typhoon paths to Qingdao storm surges with four selected paths: the paths of Typhoons Mamie(8509), Opal, 3921 and 2413, the selection being made according to their relative position to Qingdao. Experiments based on the Typhoon Mamie(8509) storm surge were also conducted to study the possible influences of future climate changes, including the sea level rise and sea surface temperature(SST) rise, on storm surges along the Qingdao coast. Storm surge conditions under both present day and future(the end of the 21 st century) climate scenarios associated with the four selected paths were simulated. The results show that with the same intensity, when typhoons follow the paths of 3921 and 2413, they would lead to the most serious disasters in different areas of Qingdao. Sea level and SST affect storm surges in different ways: sea level rise affects storm surge mainly through its influence on the tide amplitude, while the increased SST has direct impact on the intensity of the surges. The possible maximum risk of storm surges in 2100 in the Qingdao area caused by typhoons like Mamie(8509) was also estimated in this study.展开更多
文摘针对传统大数据流式计算平台节能策略并未考虑数据处理及传输的实时性问题,首先根据数据流处理的特点与storm集群的结构,建立有向无环图、实例并行度、任务资源分配与关键路径模型。其次结合拓扑执行关键路径与系统性能的分析,提出一种storm平台下工作节点的内存电压调控节能策略(WNDVR-storm,energy-efficient strategy for work node by dram voltage regulation in storm),该策略针对是否有工作节点位于拓扑执行的非关键路径上设计了2种节能算法。最后根据系统数据处理及传输的制约条件确定工作节点CPU使用率与数据传输量的阈值,并对选定的工作节点内存电压做出动态调整。实验结果表明,该策略能有效降低能耗,且制约条件越小节能效率越高。
文摘通过中尺度气象研究与预报模式WRF(weather research and forecasting)和两种台风经验模型重构了2018年影响我国珠江口地区的超强台风“山竹”过程中的气压和风矢量场,在台风最佳路径数据的基础上开展了方法间的比较,并与香港、澳门和深圳三个国际机场的实测数据进行了对比分析,验证了三种模拟方案模拟台风“山竹”的可靠性。利用非结构网格半隐式跨尺度海洋模式SCHISM(semi⁃implicit cross⁃scale hydroscience integrated system model),将三种模拟气压和风场作为驱动场输入风暴潮模式中进行增水模拟试验,比较了它们在赤湾、三灶、横门和黄埔四个测站风暴潮增水中各自的效果,并进一步验证了WRF模式和两种经验模型模拟台风“山竹”的有效性。综合来看,WRF大气模式对气压、风速、风向及风暴增水模拟效果最佳,如果进一步优化该模式的各种参数化方案,可能还能提高其精度。如果不具备使用WRF大气模式的条件,台风经验1模型也是一个完全可以接受的、简单快捷的方案。
基金supported by the Marine Industry Research Special Funds for Public Welfare Projects (No. 200905013)
文摘A typhoon-induced storm surge simulation system was developed for the Qingdao area, including a typhoon diagnostic model for the generation of wind and pressure fields and a 2D Advanced Circulation(ADCIRC) model for simulating the associated storm surge with a 200 m resolution along the Qingdao coastline. The system was validated by an extreme surge event Typhoon Mamie(8509) and the parameters of Typhoon Mamie were used to investigate the sensitivity of typhoon paths to Qingdao storm surges with four selected paths: the paths of Typhoons Mamie(8509), Opal, 3921 and 2413, the selection being made according to their relative position to Qingdao. Experiments based on the Typhoon Mamie(8509) storm surge were also conducted to study the possible influences of future climate changes, including the sea level rise and sea surface temperature(SST) rise, on storm surges along the Qingdao coast. Storm surge conditions under both present day and future(the end of the 21 st century) climate scenarios associated with the four selected paths were simulated. The results show that with the same intensity, when typhoons follow the paths of 3921 and 2413, they would lead to the most serious disasters in different areas of Qingdao. Sea level and SST affect storm surges in different ways: sea level rise affects storm surge mainly through its influence on the tide amplitude, while the increased SST has direct impact on the intensity of the surges. The possible maximum risk of storm surges in 2100 in the Qingdao area caused by typhoons like Mamie(8509) was also estimated in this study.
