Effects of convection instability due to incompatibility between ocean dynamics and surface forcings

The study demonstrates that an incompatibility between a surface temperature climatology and a given ocean model, into which the climatology is assimilated via Haney restoration, can cause model ocean climate drift and interdecadal oscillations when the ocean is switched to a weaker restoration. This is made using an idealized Atlantic Ocean model driven by thermal and wind forcing only. Initially, the temperature climatology is forcefully assimilated into the model, and an implied heat flux field is diagnosed. During this stage any incompatibility is suppressed. The restoring boundary condition is then switched to a new forcing consisting of a part of the diagnosed flux and a part of the restoring forcing in such a way that at the moment of the switching the heat flux is identical to that prior to the switching. Under this new forcing condition, the incompatibility becomes manifest, causing changes in convection patterns, and producing drift and interdecadal oscillations. The mechanisms are described.     

A time-space based approach for mapping rainfall-induced shallow landslide hazard

A rainfall-induced shallow landslide is a major hazard in mountainous terrain, but a time-space based approach is still an unsettled issue for mapping rainfall-induced shallow landslide hazards. Rain induces a rise of the groundwater level and an increase in pore water pressure that results in slope failures. In this study, an integrated infinite slope analysis model has been developed to evaluate the influence of infiltration on surficial stability of slopes by the limit equilibrium method. Based on this new integrated infinite slope analysis model, a time-space based approach has been implemented to map the distributed landslide hazard in a GIS (Geographic Information Systems) and to evaluate the shallow slope failure induced by a particular rainfall event that accounts for the rainfall intensity and duration. The case study results in a comprehensive time-space landslide hazard map that illustrates the change of the safety factor and the depth of the wetting front over time.     

铁路缓和曲线的等间隔放样方法

介绍了铁路缓和曲线设置的目的、作用、基本原则和重要意义，阐述了等间隔放样缓和曲线的基本原理，给出了等间隔放样缓和曲线放样要素采集的基本方法，叙述了缓和曲线等间隔放样的工作过程。     

福建明代人才地理分布研究

明朝福建各类人才辈出，其中被收入《明史》的人物及全省的进士数量全国排名在前。但由于经济、政治、文化等方面发展不平衡，各地人才分布不均，沿海人才多于山区，各府中心县多于同府的其他县。这些现象同时反映了当时福建文化发展的状况。     

Sedimentation rates in the Wanggang salt marshes, Jiangsu

1 IntroductionLand-ocean interaction in coastalzone is one of the key m atters of the International G eosphereand Biosphere Program (IG BP). The key problem s of the second phase in the next decadeinclude the m aterial cycle, the system evolution process …     

粮食地理学视角下乡村本土农业的社会建构——元阳哈尼梯田稻作系统案例

选取元阳哈尼梯田稻作系统为研究对象,基于粮食地理学的农产品生产-消费网络理论,通过深度访谈等方法分析多元主体在本土农业生产消费领域中的策略及行为,解读其中的社会建构现象。研究发现:农业生产领域中多元参与特征显著,优质稻种的人为筛选、种养品种的多样化以及土地流转的推广均为政府、村民和外来企业为实现各自利益而共同协商达成的策略,不同行动者共同利用与改造着农业生产的各种要素;农产品消费领域中,政府和企业逐步承担了农产品商品化的后续工序,国有资本完成农产品的收购、加工与包装,外来商业资本负责建构商品品牌,满足目标消费者的市场需求是他们的共同目标。     

水下航行体双空泡相互作用数值模拟研究

高速水下航行体头肩部和表面突起等位置很容易产生空泡,不失一般性,将表面突起结构简化为一定高度的台阶.针对简化的航行体模型,基于数值模拟方法研究了头肩部空泡与台阶处空泡、头肩部空泡与尾空泡2种类型的双空泡相互作用问题.不同的来流攻角下,头肩部空泡与台阶处空泡的作用过程存在区别,可以分为大攻角和小攻角2种类型.当尾空泡内有...     

新疆塔里木盆地西—西南缘泥盆—石炭纪四射珊瑚

塔里木盆地西—西南缘石炭纪地层层序清楚,化石丰富,是新疆研究石炭系的良好地区之一。目前海相泥盆纪地层中有化石佐证的只有中泥盆世,而早泥盆世地层存在与否尚难定论。描述珊瑚计22属22种。中泥盆统3属3新种,石炭纪19属12新种。塔里木盆地西—西南缘的中泥盆统称克孜勒陶组,上泥盆统为奇自拉夫组,属陆相沉积。石炭系自下而上为下统库山河组、克里塔克组、和什拉甫组;中统卡拉乌依组、阿孜干组;上石炭统塔哈奇组、克孜里奇曼组。     

用自组织人工神经网络分类,识别矿物

作者运用三维Ｔ．Ｋｏｈｏｎｅｎ自组织人工神经网络对我国沉积碳酸盐型锰矿中菱锰矿进行分类、识别。所选研究实例中，识别成功率达１００％．结果表明，该网络性能良好，可望成为矿物识别的有效手段。