Sand/dust storms are some of the main hazards in arid and semi-arid zones. These storms also influence global environmental changes. By field observations, empirical statistics, and numerical simulations, pioneer rese...Sand/dust storms are some of the main hazards in arid and semi-arid zones. These storms also influence global environmental changes. By field observations, empirical statistics, and numerical simulations, pioneer researchers on these natural events have concluded the existence of a positive relationship between thermodynamic effects and sand/dust storms. Thermodynamic effects induce an unsteady stratified atmosphere to influence the process of these storms. However, studies on the relationship of thermodynamic effects with particles (i.e., sand and dust) are limited. In this article, wind tunnel with heating was used to simulate the quantitative relationship between thermodynamic effects and particle movement on different surfaces. Compared with the cold state, the threshold wind velocity of particles is found to be significantly decrease under the hot state. The largest decrease percentage exceedes 9% on fine and coarse sand surfaces. The wind velocity also has a three-power function in the sand transport rate under the hot state with increased sand transport. Thermodynamic effects are stronger on loose surfaces and fine particles, but weaker on compacted surfaces and coarse particles.展开更多
A graphical simulation is developed to calculate the map of the Indian Ocean debris drift, and using the experimental approach to study the alternative crash location of the vanished aircraft MH370. Drawing research u...A graphical simulation is developed to calculate the map of the Indian Ocean debris drift, and using the experimental approach to study the alternative crash location of the vanished aircraft MH370. Drawing research used new discovered and known statistics of Oceanic surface currents map, and published satellite data of aircraft tracking to review the new critical data. Theory of prediction in a research for lost transport unit is the successful tool to control ongoing investigation. The entire area of the crash location of plane’s debris drift model is based on the early stage of the Oceanic mapping of underwater investigation. With discovering actual new facts, ongoing efforts are in stage to evaluate interpret factual findings. Appearance of MH370 aircraft wing part—flaperon ignited research trends of Indian Ocean debris drift mapping study with the purpose to isolate final crash location. On experimental basis, the article discusses the comparison of ongoing research of international groups in aim to point underwater search to the the site of plane crash. The process of Oceanic debris transport is a physics task, and the computation of debris drift can be observed on the interval statistics data set of Oceanic debris season. In this experimental simulation, on the base of Indian Ocean drift data—observer studied the possibility of the North Gyre debris transport trace to explain the timeout of single appearance of flaperon, declared in official investigation. The article resumes to study and to conclude the possible alternative approach of North Gyre crash location. Graphical computer visualization presented in a comparison to recent studies is conducted by Australian and Germany groups. Their trends on the scour survey of the first phase stage seabed mapping, oceanic surface search in a mean time, can be described as comparable approximations. Given in a research, experimental simulation graphically visualized the possibility of North Gyre debris transport exchange.展开更多
In order to investigate the aggregation mechanism of green macroalgae(Enteromorpha prolifera)on the Qingdao coastline,the macroalgal drift characteristics in the Yellow Sea during June and July in 2008 and 2010 were s...In order to investigate the aggregation mechanism of green macroalgae(Enteromorpha prolifera)on the Qingdao coastline,the macroalgal drift characteristics in the Yellow Sea during June and July in 2008 and 2010 were simulated using a three-dimensional wave-tide-circulation coupled model.In June 2008,the monthly-mean surface current flowed onshore and its direction was almost perpendicular to the Qingdao coastline,which was identified as the main reason for a huge accumulation of algae in the coastal waters off Qingdao.The current became parallel to the coastline in July 2008;this shift in current direction led to little accumulation of algae near Qingdao and thus relieved the environmental pressure on the Olympic sailing events.By using the coupled model,we predicted that there would be no serious algal accumulation at Qingdao in late June 2010,which was later confirmed by observations.This study demonstrated that the drift path of macroalgae near Qingdao is mainly controlled by the surface current,which is primarily driven by wind.Regional climate change is therefore one of the means by which physical processes affect marine ecosystems.展开更多
基金Under the auspices of National Natural Science Foundation of China(No.40930741,41071009,41001005)Knowledge Innovation Programs of Chinese Academy of Sciences(No.KZCX2-YW-329)
文摘Sand/dust storms are some of the main hazards in arid and semi-arid zones. These storms also influence global environmental changes. By field observations, empirical statistics, and numerical simulations, pioneer researchers on these natural events have concluded the existence of a positive relationship between thermodynamic effects and sand/dust storms. Thermodynamic effects induce an unsteady stratified atmosphere to influence the process of these storms. However, studies on the relationship of thermodynamic effects with particles (i.e., sand and dust) are limited. In this article, wind tunnel with heating was used to simulate the quantitative relationship between thermodynamic effects and particle movement on different surfaces. Compared with the cold state, the threshold wind velocity of particles is found to be significantly decrease under the hot state. The largest decrease percentage exceedes 9% on fine and coarse sand surfaces. The wind velocity also has a three-power function in the sand transport rate under the hot state with increased sand transport. Thermodynamic effects are stronger on loose surfaces and fine particles, but weaker on compacted surfaces and coarse particles.
文摘A graphical simulation is developed to calculate the map of the Indian Ocean debris drift, and using the experimental approach to study the alternative crash location of the vanished aircraft MH370. Drawing research used new discovered and known statistics of Oceanic surface currents map, and published satellite data of aircraft tracking to review the new critical data. Theory of prediction in a research for lost transport unit is the successful tool to control ongoing investigation. The entire area of the crash location of plane’s debris drift model is based on the early stage of the Oceanic mapping of underwater investigation. With discovering actual new facts, ongoing efforts are in stage to evaluate interpret factual findings. Appearance of MH370 aircraft wing part—flaperon ignited research trends of Indian Ocean debris drift mapping study with the purpose to isolate final crash location. On experimental basis, the article discusses the comparison of ongoing research of international groups in aim to point underwater search to the the site of plane crash. The process of Oceanic debris transport is a physics task, and the computation of debris drift can be observed on the interval statistics data set of Oceanic debris season. In this experimental simulation, on the base of Indian Ocean drift data—observer studied the possibility of the North Gyre debris transport trace to explain the timeout of single appearance of flaperon, declared in official investigation. The article resumes to study and to conclude the possible alternative approach of North Gyre crash location. Graphical computer visualization presented in a comparison to recent studies is conducted by Australian and Germany groups. Their trends on the scour survey of the first phase stage seabed mapping, oceanic surface search in a mean time, can be described as comparable approximations. Given in a research, experimental simulation graphically visualized the possibility of North Gyre debris transport exchange.
基金supported by the National 908 Project of China(908-02-01-04)the National Key Technology R&D Special Program(2008 BAC49B02)
文摘In order to investigate the aggregation mechanism of green macroalgae(Enteromorpha prolifera)on the Qingdao coastline,the macroalgal drift characteristics in the Yellow Sea during June and July in 2008 and 2010 were simulated using a three-dimensional wave-tide-circulation coupled model.In June 2008,the monthly-mean surface current flowed onshore and its direction was almost perpendicular to the Qingdao coastline,which was identified as the main reason for a huge accumulation of algae in the coastal waters off Qingdao.The current became parallel to the coastline in July 2008;this shift in current direction led to little accumulation of algae near Qingdao and thus relieved the environmental pressure on the Olympic sailing events.By using the coupled model,we predicted that there would be no serious algal accumulation at Qingdao in late June 2010,which was later confirmed by observations.This study demonstrated that the drift path of macroalgae near Qingdao is mainly controlled by the surface current,which is primarily driven by wind.Regional climate change is therefore one of the means by which physical processes affect marine ecosystems.
