浅谈OGFC路面施工控制要点

OGFC路面是开级配沥青磨耗层(Open Graded Asphalt Friction Course)的简称,设计空隙率大于18％,在雨天能使路面雨水迅速下渗并沿下封层表面横坡及纵坡流至边沟排除,从而消除路面积水,减少行车水雾,消除夜间车灯的眩光,提高行车安全性。因其具备的较大的空隙率,能够在一定程度上降低路面噪声,且抗滑、抗车辙性能突出。     

Biological early warning and emergency management support system for water pollution accident

Water pollution accidents such as chemical spill and toxicants leach have become a serious issue in the world, which brings great threats to the aquatic ecosystem and drinking water safety. To detect unknown pollutions in time and take proper emergency actions, this study developed a system which integrated an online intelligent water quality monitoring device with a high efficient water quality model. The device is based on water quality probes and biological sensors which use fish motion as indicator. The numerical model is a combination of Euler and Lagrangian approaches. Finite element method is applied to simulate the flow field in an unstructured grid, and the pollutant be- haviours are traced through particle tracking. Oracle is used to manage the basic and monitoring data, and ArcSDE as well as ArcIMS technologies are applied to make the system WebGIS-based so as to improve the data receiving and dispatching efficiency. The developed system has been successfully operated in Douhe Reservoir and Taihu Lake, China, where drinking water intakes are installed. It is seen from the applications that the online intelligent water qual- ity monitoring and emergency support system can be of great support to emergency management.