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排序方式: 共有1074条查询结果,搜索用时 15 毫秒
971.
A baroclinic typhoon model with a moving multi-nested grid is applied in marine environmental forecasts.This paper describes the numerical methods of the model including governing equations, finite differencing, split scheme and time integration. 相似文献
972.
INTRODUCTIONThe world ocean is one of the important components of the human environment. With thedevelopment of marine resource exploit and marine engineering, more and more attention shouldbe paid to the study of ocean current movements by the means of numerical simulation and numerical prediction. It can not only improve our knowledge about the law of ocean circulation but alsocheck the reliability of theoretical research and scientific prediction. On the other hand, it canmake up for t… 相似文献
973.
Zheng Zhizhen Robert K. Vincent Shen Ping and Yang XuanhuiCenter for Seismic Data Information CSB Beijing China Bowling Green State University Ohio - USA Institute of Geophysics CSB Beijing China 《中国地震研究》1999,(4)
In this paper, the observation networks of precursory geosound and observation instruments are introduced first. Then it is mentioned, in particular, that audible precursory geosound was instrumentally recorded for the first time. The following section discussed the relation between the geosound and earthquake. Finally, the Nucleation time in earthquake preparation process is discussed. 相似文献
974.
Study on diel rhythm of chlorophyll a and photosynthesis in nearshore waters of Qingdao 总被引:1,自引:0,他引:1
StudyondielrhythmofchlorophyllaandphotosynthesisinnearshorewatersofQingdaoMaoXinghua,ZhuMingyuan,YangXiaolong,HaoYaweiandJohn... 相似文献
975.
用STEM—Ⅱ模式研究东亚地区春季沙尘气溶胶对硫化物输送和沉降的影响 总被引:1,自引:0,他引:1
利用STEM-II三维区域尺度大气化学模式,研究了1994年3月1日至14日东亚地区春季沙尘气溶胶对硫化物输送和沉降的影响。结果表明,SO2和SO24的大值区主要出现在我国东部地区。在模拟时段,日本地区火山源的排放对该地区大气中S分布的贡献达10%~30%。并与当时飞机的观测结果相吻合。模拟区域内SO2和SO24的收支的分析研究表明,在硫的总排放量中,从东边界面流出去的输送通量最大,并出现在30~400N带的2~6km高度上,这是与该地区最大的人为排放源所在地相一致的。最后,给出了模拟时段整个对流层大气SO2-4气溶胶含量的分布,还仨算了SO2-4气溶胶对地气系统的直接辐射强迫和温度变化的影响。 相似文献
976.
977.
978.
黄土高原遥感分类应用研究 总被引:5,自引:0,他引:5
Due to complex terrain of the Loess Plateau, the classification accuracy is unsatisfactory when a single supervised classification is used in the remote sensing investigation of the sloping field. Taking the loess hill and gully area of northern Shaanxi Province as a test area, a research was conducted to extract sloping field and other land use categories by applying an integrated classification. Based on an integration of supervised classification and unsupervised classification, sampling method is remarkably improved. The results show that the classification accuracy is satisfactory by the method and is of critical significance in obtaining up-to-date information of the sloping field, which should be helpful in the state key project of converting fiumland to forest and grassland on slope land in this area. This research sought to improve the appfication accuracy of image classification in complex terrain areas. 相似文献
979.
Roughness-induced emission from ocean surfaces is one of the main issues that affects the retrieval accuracy of sea surface salinity remote sensing. In previous studies, the correction of roughness effect mainly depended on wind speeds retrieved from scatterometers or those provided by other means, which necessitates a high requirement for accuracy and synchronicity of wind-speed measurements. The aim of this study is to develop a novel roughness correction model of ocean emissivity for the salinity retrieval application. The combined active/passive observations of normalized radar cross-sections (NRCSs) and emissivities from ocean surfaces given by the L-band Aquarius/SAC-D mission, and the auxiliary wind directions collocated from the National Centers for Environmental Prediction (NCEP) dataset are used for model development. The model is validated against the observations and the Aquarius standard algorithms of roughness-induced emissivity correction. Comparisons between model computations and measurements indicate that the model has better accuracy in computing wind-induced brightness temperature in the upwind/downwind directions or for the surfaces with smaller NRCSs, which can be better than 0.3 K. However, for crosswind directions and larger NRCSs, the model accuracy is relatively low. A model using HH-polarized NRCSs yields better accuracy than that using VV-polarized ones. For a fair comparison to the Aquarius standard algorithms using wind speeds retrieved from multi-source data, the maximum likelihood estimation is employed to produce results combining our model calculations and those using other sources. Numerical simulations show that combined results basically have higher accuracy than the standard algorithms. 相似文献
980.
Seabed Classification Using BP Neural Network Based on GA 总被引:4,自引:0,他引:4
INTRODUCTIONUnderwaterremotesensingtools,suchasmulti beam ,sidescansonar,sub bottom pro file ,video ,etc .,arenormalmeanstoexploreseabed .Foreaseofnotation ,sidescansonarim ageisusedtodemonstrateseabedimage .Sidescansonarisakindofhigh resolutionimagingandcancontinuouslymonitorthechangesofseafloor.Inordertorelievetechniciansfromhardhandwork ,theautomaticclassificationbycomputerisneeded .Differentfromthespatialremotesensingimage ,underwatersonarimageistheformernon multi spectralimage .Theo… 相似文献