中国LUCC信息学方法体系的结构与应用分析   总被引：1，自引：0，他引：1  

邓祥征  邵全琴  李国胜  樊江文 《地球信息科学学报》2009,11(4):406-412

LUCC信息学方法体系是集区域自然地理学理论方法与GIS技术于一体的新兴学科领域。该方法体系以遥感、GIS及海量数据采集与处理技术为基础,主要应用于多尺度、多层次的土地利用和土地覆被变化时空过程与格局演替探测与模拟、驱动机理提炼及宏观生态效应分析研究,并在相关专题的案例研究中,得到不断验证、丰富与发展。本文回顾了LUCC信息学方法体系的发展历程,阐明了我国LUCC信息学方法体系的核心方法、技术特征和研究现状。其中,土地利用与土地覆被遥感动态信息提取与分析、驱动机理提炼、时空过程模拟、宏观生态效应评价技术的发展和土地利用与土地覆被研究信息平台的建设及相关技术方法的集成,推动了中国LUCC信息学的形成,并构成了LUCC信息学方法体系的基本结构。  相似文献   

年代际尺度海岸演化机制与动力-统计建模方法     

李国胜  廖和平 《地理研究》2013,32(9):1613-1622

发展中长时间尺度的海岸演化预测方法与机理模型,是目前国际海岸演化研究领域关注的焦点和最具挑战性课题。本文系统性地回顾了近半个世纪以来不同时间尺度海岸演化模式的研究发展历程和成果,从动力机制和时间尺度两个方面对海岸演化机理模型存在的主要建模瓶颈问题进行了系统总结。通过对渤海湾西岸近一个半世纪以来海岸演化机制的初步分析,提出了以泥沙收支、环流输送、波浪掀沙以及波气候变化等要素作为年代际尺度海岸演化主要驱动因子,基于驱动力概化与统计升尺度有机衔接的年代际尺度海岸演化机理模型的动力—统计建模方法框架新思路,为推动海岸演化动力学理论体系和中长时间尺度海岸演化预测方法创新,提供了重要科学依据和借鉴。  相似文献   

黄河入海悬沙季节输送变化与输送机制的数值研究(英文)     

李国胜  王海龙  廖和平 《地理学报(英文版)》2010,20(6):923-937

Based on sediment and discharge flux data for the Yellow River, realistic forcing fields and bathymetry of the Bohai Sea, a suspended sediment transport module is driven by a wave-current coupled model to research seasonal variations and mechanisms of suspended load transport to the Bohai Sea. It could be concluded that surface sediment concentration indicates a distinct spatial distribution characteristic that varies seasonally in the Bohai Sea. Sediment concentration is rather high near the Yellow River estuary, seasonal variations of which are controlled by quantity of sediment from the Yellow River, suspended sediment concentration reaches its maximum during summer and fall. Furthermore, sediment concentration decreases rapidly in other seas far from the Yellow River estuary and maintains a very low level in the center of the Bohai Sea, and is dominated by seasonal variations of climatology wind field in the Bohai Sea. Only a small amount of sediments imported from the Yellow River are delivered northwestward to the southern coast of the Bohai Bay. Majority of sediments are transported southeastward to the Laizhou Bay, where sediments are continuously delivered into the center of the Bohai Sea in a northeastward direction, and part of them are transported eastward alongshore through the Bohai Strait. 69% of sediments from the Yellow River are deposited near the river delta, 31% conveyed seaward, within which, 4% exported to the northern Yellow Sea through the Bohai Strait. Wind wave is the most essential contributor to seasonal variations of sediment concentration in the Bohai Sea, and the contribution of tidal currents is also significant in shallow waters when wind speed is low.  相似文献   

黄河入海泥沙悬移输送机制的控制试验(英文)     

李国胜  黄薛华  刘英  王海龙  廖和平 《地理学报(英文版)》2010,20(1):49-63

Five diagnostic experiments with a 3D baroclinic hydrodynamic and sediment transport model ECOMSED in couple with the third generation wave model SWAN and the Grant-Madsen bottom boundary layer model driven by the monthly sediment load of the Yellow River, were conducted to separately diagnose effects of different hydrodynamic factors on transport of suspended sediment discharged from the Yellow River in the Bohai Sea. Both transport and spatio-temporal distribution of suspended sediment concentration in the Bohai Sea were numerially simulated. It could be concluded that suspended sediment discharged from the Yellow River cannot be delivered in long distance under the condition of tidal current. Almost all of sediments from the Yellow River are deposited outside the delta under the condition of wind-driven current, and only very small of them are transported faraway. On the basis of wind forcing, sediments from the Yellow River are mainly transported north-northwestward, and others which are first delivered to the Laizhou Bay are continuously moved northward. An obvious 3D structure characteristic of sediment transport is produced in the wind-driven and tide-induced residual circulation condition. Transport patterns at all layers are generally consistent with circulation structure, but there is apparent deviation between the depth-averaged sediment flux and the circulation structure. The phase of temporal variation of sediment concentration is consistent with that of the bottom shear stress, both of which are proved to have a ten-day cycle in wave and current condition.  相似文献   

渤海海洋悬浮泥沙二元特征参数MODIS遥感反演模型研究     

李国胜  王方  廖和平 《地理学报(英文版)》2008,18(4):443-454

This paper brought out a new idea on the retrieval of suspended sediment concentration, which uses both the water-leaving radiance from remote sensing data and the grain size of the suspended sediment. A principal component model and a neural network model based on those two parameters were constructed. The analyzing results indicate that testing errors of the models using the two parameters are 0.256 and 0.244, while the errors using only water-leaving radiance are 0,384 and 0.390. The stability of the models with grain size parameter is also better than the one without grain size. This research proved that it is necessary to introduce the grain size parameter into suspended sediment concentration retrieval models in order to improve the retrieval precision of these models.  相似文献   

渤海风驱-潮致拉格朗日余流的数值模拟与季相时空变异   总被引：5，自引：0，他引：5  

李国胜  王海龙  李柏良 《地理研究》2005,24(3):359-370

利用HellermanandRosenstein全球风应力资料中的多年月平均风场资料驱动ECOM模型,设计了潮致、纯风生以及风与潮两者叠加三个数值实验对渤海海域风驱-潮致拉格朗日(Lagrange)余流的逐月时空分布与季节变化进行了模拟。研究结果表明,季风的大小和方向决定了渤海风驱-潮致拉格朗日余流的大小和方向,是影响余流流向和流速的重要因素。冬季,从渤海西岸到莱州湾海域风驱-潮致拉格朗日余流表现出一个大逆时针环流,辽东湾呈现顺时针方向流动,渤海中部存在一个弱的顺时针流环。夏季,整个渤海海域呈现顺时针流况,渤海海盆存在一微弱的逆时针涡旋,一支西南向流沿辽东湾东岸穿越渤海海盆,与起自渤海湾的东向流一起进入莱州湾。风驱-潮致拉格朗日余流主要受风的控制,潮汐则起到一定的调整作用。  相似文献   

土壤厚度的空间插值方法比较——以青海三江源地区为例   总被引：5，自引：0，他引：5  

易湘生  李国胜  尹衍雨  彭景涛 《地理研究》2012,31(10):1793-1805

利用青海三江源地区533个土壤剖面中的厚度数据, 在GIS技术的支持下, 采用确定性内插(反距离加权、全局多项式、局部多项式和径向基函数)和地统计内插(普通克里格、简单克里格、泛克里格和协同克里格)两类共八种插值方法对研究区土壤厚度的空间分布进行了预测, 并综合比较了各种插值方法的预测误差、统计特征值和插值结果分布图。结果表明:(1)在地统计内插方法中, 普通克里格方法(一阶)插值效果比普通克里格方法(二阶)要好;在普通克里格方法(一阶)的半方差函数模型中, 球状模型的插值效果优于指数模型和高斯模型;普通克里格方法在四种地统计内插方法中预测误差最小、预测结果准确性最好。(2)确定性内插方法中, 反距离加权(指数为1)法的误差较小, 并且对区域与局部趋势的反映效果最好。(3)从预测误差大小和对区域总体及局部趋势的综合反映效果来看, 有异向性的球状模型普通克里格(一阶)插值方法预测结果最能准确反映青海三江源地区土壤厚度的空间分布。  相似文献   

东太平洋CC区多金属结核矿物学特征及物源     

李国胜 《物探与化探》2009,33(6)

通过对东太平洋CC区洋底地质取样及实验测试分析,运用洋底照相、多频探测等多种地球物理方法手段,进一步阐明了CC区多金属结核的形态、主要类型、化学成分及分布特征.通过对CC区沉积作用、生物作用、洋底火山作用、海水化学成分、南极底流等因素的综合研究分析, 进一步揭示了多金属结核形成的物质来源.通过对CC区区域地质背景及地形地貌的综合研究分析, 进一步探讨了多金属结核的形成环境,并建立了成矿模式.  相似文献   

顾桥井田主井井筒开凿技术条件评价     

李国胜 《矿井地质》1997,(2):94-100,F003

本文试图通过顾桥井田主井井筒检查孔资料，采用现实可行的方法，原则，在井筒开凿地其开凿技术条件作出评价。  相似文献   

多源遥感影像高精度自动配准的方法研究   总被引：25，自引：0，他引：25  

张继贤  李国胜  曾钰 《遥感学报》2005,9(1):73-77

提出并发展了一套对多源遥感影像(不同传感器、不同分辨率、不同时相的遥感影像)的高精度自动纠正与配准技术与方法。遥感影像首先通过一个多项式模型进行整体粗纠正,然后在待配准影像上提取均匀分布的特征点。以提取的特征点为引导,利用金字塔逐层模板匹配的方法获得配准用同名控制点,基此构建不规则三角网将影像分解为各三角形区域,在每个三角形范围内实现逐三角网的高精度影像纠正与配准。  相似文献