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991.
利用11年高分辨率的(OGCM for the Earth Simulator,OFES)模式数据,计算南海涡致热输运(EHT),分析其时空变化特征。并利用卫星高度计数据验证OFES模式模拟南海涡致热输运的可靠性。研究结果表明,南海涡致热输运高值区主要分布在西边界流区,在南海北部和越南东南条带状区域,沿着中尺度涡运动路径,北部条带为向极输运,南部条带为向赤道输运,最大值达到了180MW/m。两高值区中间输运很小,沿着2500m等深线,为涡中心运动路径。南海中部涡致热输运较小。无论暖涡、冷涡,产生的致热输运均为顺时针方向。南海涡致热输运也存在明显的季节和年际变化。越南东南秋季输运最大,春冬季次之,夏季最小;南海北部则是春冬季最大,夏季最小。而在年际上,越南东南在2003、2007、2011年较大,南海北部则在2004、2007、2010年较大。 相似文献
992.
Fish utilization of a salt marsh intertidal creek in the Yangtze River estuary, China 总被引:6,自引:0,他引:6
Binsong Jin Cuizhang Fu Junsheng Zhong Bo Li Jiakuan Chen Jihua Wu 《Estuarine, Coastal and Shelf Science》2007,73(3-4):844-852
The structure and temporal variations of the fish community in salt marshes of Chinese estuaries are poorly understood. Fish utilization of a salt marsh intertidal creek in the Yangtze River estuary was studied based on quarterly sampling surveys in July and November, 2004, and February and May, 2005. Fishes were collected by consecutive day and night samplings using fyke nets during the ebbing spring tides. A total of 25,010 individuals were caught during the study. 17 families and 33 species were documented, and the most species-rich family was Gobiidae. Three species, Synechogobius ommaturus, Chelon haematocheilus and Lateolabrax maculatus together comprised 95.65% of the total catch, which were also the most important commercial fishery species in the Yangtze River estuary. The fish community was dominated by juvenile individuals of estuarine resident species. Time of year significantly affected fish use of salt marshes, but no significant effects of diel periodicity on the fish community were found except for fish sampling in July. These findings indicate that salt marshes in the Yangtze River estuary may play important nursery roles for fish community. 相似文献
993.
994.
The problems of the earth’s gravity fields’ visualization are both focus and puzzle currently. Aiming at multiresolution rendering,
modeling of the Earth’s gravity fields’ data is discussed in the paper by using LOD algorithm based on Quad Tree. First, this
paper employed the method of LOD based on Quad Tree to divide up the regional gravity anomaly data, introduced the combined
node evaluation system that was composed of viewpoint related and roughness related systems, and then eliminated the T-cracks
that appeared among the gravity anomaly data grids with different resolutions. The test results demonstrated that the gravity
anomaly data grids’ rendering effects were living, and the computational power was low. Therefore, the proposed algorithm
was a suitable method for modeling the gravity anomaly data and has potential applications in visualization of the earth’s
gravity fields. 相似文献
995.
996.
地质灾害应急调查系统的设计与实现 总被引:3,自引:0,他引:3
针对地质灾害应急调查对灾害信息实时、准确、完整的要求,分析嵌入式GIS在地质灾害应急调查中的应用特点和优势,并借助MapGIS-EMS地图引擎开发系统基本框架。系统加入素描图使得更加完整地描述现场,采用编辑距离方法对调查数据质量进行检查,利用无线通讯网络采用动态缓存和分包传输机制保证灾害信息的实时、完整上传,使系统成为提高地质灾害应急调查效率的有力工具。 相似文献
997.
动态分段思想在公路地理信息系统中的实现 总被引:7,自引:0,他引:7
动态分段是一种全新的线性特征的动态分析技术,可以有效地解决公路线性特征的动态分析问题,实现公路图形和属性数据间的双向动态可视化查询。文章以Arc/Info为代表,分析了动态分段技术的原理,结合VB6.0、MapObjects2.2和Access,初步介绍了公路GIS中动态分段的数据结构与算法,并探讨了如何实现公路GIS的过程。 相似文献
998.
简述了SuperMapGIS5年来在日本的发展历史及现状,并展望了未来SuperMap GIS在日本的发展状况。日文版的SuperMap GIS应日本政府、企业和公众需求而产生,在铁路、医疗、教育、设施管理、城市建设等方面发挥越来越重要的作用。在日本地理信息系统领域内,SuperMap经过了多年的探索后正稳步前进。 相似文献
999.
根据某大坝右岸围堰爆破,对爆破地震波三维空间的频谱、加速度、速度、动力放大倍数进行了研究,得到爆破地震波在砼重力坝的不同高度、不同方向、不同介质中的反应特性。 相似文献
1000.
Changes in glacial lakes and glaciers of post-1986 in the Poiqu River basin, Nyalam, Xizang (Tibet) 总被引:16,自引:0,他引:16
Glacial lakes and glaciers are sensitive indicators of recent climate change. In the Poiqu River basin of southern Tibet, 60–100 km NW of Mt. Everest, Landsat imagery defines post-1986 changes in the size and distribution of both glacial lakes and glaciers. Total area of glaciers in the 229-km2 drainage area has decreased by 20%. The number of glacial lakes with areas in excess of 0.020 km2 has increased by 11%, and the total area of glacial lakes has increased by 47%. The areas of typical large glacial lakes of the area (Galongco, Gangxico, and Cirenmaco) have increased by 104, 118, and 156%, respectively, and these increases are confirmed by field investigations.Comparing the 1986 data, the area of glaciers in the basin headwaters has decreased by 46.18 km2 to a present total area of 183.12 km2, an annual rate of change of 3.30 km2/year. Trends indicate that the total area of glaciers will continue to decrease and that both the numbers and areas of glacial lakes will continue to increase. Accompanying these trends will be an increased risk of debris flows, formed by entrainment of sediment in glacial-outburst floods and in surges from both failure and avalanche- and landslide-induced overtopping of moraine dams. Based on both the local and world-wide history of catastrophes from flows of these origins, disaster mitigation must be planned and appropriate engineering countermeasures put in place as soon as possible. 相似文献