| Climate resources mainly refers to the atmospheric wind, radiation, precipitation and other natural power, heat, water vapor resources. Climate resources in two ways affect human life:one is the direct effect of climate resources, the other is the indirect effects of climate resources, driven by air-sea interaction currents, affect the sea surface temperature, sea level change local. The atmosphere and oceans, including natural interaction with the conversion, making the ocean to become a new climate-energy.This thesis investigates on the frequent occurrence of the cold wave in winter and spring cool wind on the distribution and characteristics of China’s coastal marine elements, and understand the resulting local coastal currents and thermal energy during the cold wave in the evolution of characteristics. Local marine monitoring data acquisition difficult, so in addition to satellite data and reanalysis data outside the area of application processing, focusing on regional ocean model simulation, a systematic understanding of the cool wind of the cold weather during the evolution of the regional seas Tridimensional Effects.The statistics of the past20years (1991to2009) the Yangtze River estuary, Hangzhou Bay in the more significant cold wave, by the path and intensity of the invasion of the Yangtze River estuary, Hangzhou Bay area cold wave classification and grading. Invasion of the Yangtze River Estuary, Hangzhou Bay cold spell occurred in the winter and spring, in which high-frequency multi-appeared in the December cold wave process cooling rate of up to13℃. Cold wave into the sea path can be divided into three categories, I is for North Road,; class II West Road, cold wave front immigrants from Xinjiang, Qinghai, Sichuan and eastward to the Yangtze Delta Hangzhou Bay into the sea; class III Road, cold wave front immigrants from Mongolia, Shanxi and Henan swept to the southeast of Hangzhou Bay, the Yangtze River estuary.Major survey of cold wave process on the the offshore regional seas element distribution and characteristics of the impact, so cold wave intensity path difference of two processes:March10,2005North Road, cold wave, December20,2008West Road, cold wave. Two cold wave process affect the marine element characteristics of temporal and spatial variation of numerical simulation, the design of a variety of influencing factors combined experimental. Consider only the astronomical tide, astronomical tide and cold waves windy, cool astronomical tide and cold waves, astronomical tide and cold waves cool wind, as well as to increase the wave-driven groups of numerical experiments. The trial results showed:North Road cold wave one example with strong northerly winds, the eastern coastal area of the flow field in its role southerly along the shoreline, especially in the Yangtze River estuary mouth of Hangzhou Bay, is consistent with the southward currents. The wind-driven current maximum flow rate of close to3m/s. West Road, cold wave carries a strong westerly wind affect the Yangtze River Estuary, Hangzhou Bay, in the Yangtze River estuary mouth of Hangzhou Bay, significant currents to the easterly direction. Cold wave high winds caused significant changes in coastal water level, North Road, the cold wave, the Yangtze River Estuary, Hangzhou Bay south due to ocean currents flow in the Ekman drift to the right of the mass transport under the action of the flow of sea water to the shore, more than the water level in the Yangtze River estuary, Hangzhou Bay significantly higher, the largest rise up to2.2m West Road, the cold wave, the flow of the Yangtze River estuary, Hangzhou Bay Sea offshore easterly direction, the mass transport under the action of the Ekman drift to the right, to the southerly offshore movement of sea water, causing the water level of the Yangtze Delta Hangzhou Bay I significantly reduce negative I water level of1.8m. Power factor coupled wave action on the North Road, cold, high winds and waves, causing the water level increases, West Road, cold wave caused by for inshore negative level, the response of the wave wind field, resulting in small wind periods, the water level decreased water level variation is also reduced. The gale hours the water level is further decreased, and proportional to the wind speed of wind. The same time, during the cold wave, after considering the wave, the flow of nearshore currents basic little effect, but the flow rate is significantly reduced, the effect of the disturbance of the surface current wave fluctuations. Waves affect performance in the West Road cold windy periods wind-driven current direction remains the same, the flow rate increased significantly, the presence of waves weaken the effect of the trend cycle. Thus increasing the coupling of the wave, FVCOM-SWAN mode is more reasonable simulation of near-shore marine elements of change and response to environmental factors.The two Cold Wave sea surface temperature caused by the Yangtze River estuary, Hangzhou Bay area decreased significantly, North Road, cold wave caused the the Changjiang Delta SST largest cooling2℃; West Road, cold wave caused by the mouth of Hangzhou Bay SST maximum cooling of about1.5℃. Cold Wave caused by the cold seawater under warm unstable structure, causing the the seawater vertical mixing, resulting in changes in ocean water mass properties and the thermocline position. The role of wind farms in the near shallow water areas, prompting seawater to speed up the wind stress and wave vertical mixing. Outer sea water of a thick layer of the wind stress level is relatively shallow, and temperature affect the process is relatively slow, the overall stratification. Lands area by calculating the seawater temperature water mass transport, to investigate the effects of cold wave process of the seawater thermal field dynamic field configuration. The calculation results show that the cooling in the cold wave cold trough area, the mass transport value significant increase in the the isotherm was spoke bulk temperature ridge area, mass transport value decreases. Overall, the quality of the conveying direction correspond to a non-uniform density gradient-flow direction.Further explore of the local coastal currents caused by the cold wave and thermal energy evolution characteristics. In the summer in the Yangtze Estuary, Hangzhou Bay, currents generally abundant, winter is poor, you may have a certain relationship with the runoff of the winter dry season and summer flood flow difference. Regional ocean currents can increase under the influence of cold weather, windy and cold wave-driven currents speed increased. Regional ocean can also exist characteristics of Winter weak summer strong, this should enhance the the winter offshore seawater mixed, the temperature difference is small, and the summer seawater stratification characteristics, the temperature difference between the upper and lower large related. Thus, for the cold weather, not only disastrous, also increase ocean energy side, the cold wave process while avoiding disadvantages, will be conducive to the development and utilization of ocean energy, for the benefit of mankind. |
