复杂山地随机介质GMM-ULTI法射线追踪

对复杂山地介质的非均质性以及介质中地震波运动学特征进行深入研究,对于提高复杂山地区域地震勘探的效果有着重要的理论意义和实际价值.为了研究复杂山地非均质性和该介质中地震波的一些运动特性,提出了一种复杂山地随机介质的建模方法和一种新的射线追踪算法.与常规算法相比,复杂山地随机介质的生成方法采用更贴近实际介质特点的梯度介质作为背景介质,并在模型生成过程中加入地形修正步骤;新提出的GMM-ULTI射线追踪算法,充分融合群推进法、迎风思想、走时插值法的优势,采用先计算走时后追踪射线路径的两步策略完成射线追踪.算法分析与计算实例表明:复杂山地随机介质的生成方法能灵活、精细且更贴近实际地刻画复杂山地介质的非均质特点;新射线追踪算法兼顾精度和效率、能无条件稳定且灵活地适应复杂山地随机介质的特点;同时基于对几个模型试算结果的分析也得出了复杂山地随机介质中的地震波的一些传播规律.     

The effects of land use on runoff and soil nutrient losses in a gully catchment of the hilly areas： implications for erosion control

1 Introduction Soiland waterlossisoneofthe worldwide environm entalissuesthreatening sustainable land use in semiarid areas.However,soiland water loss is highly variable in space and time,and its variability resultsfrom m any factorsoperating ata wide ran…     

珠三角丘陵山区岩溶塌陷发育特征及地质模式—以广州北部为例

岩溶塌陷是珠三角岩溶区主要的地质灾害之一。本文以广州丘陵山区为研究区,利用2016~2018年1:50 000环境地质调查成果,分析岩溶塌陷发育现状和特征,研究岩溶塌陷形成地质模式,并提出防治措施建议。结果表明：广州丘陵山区累计已发生岩溶塌陷地质灾害35处,空间分布上具有集中性和反复性特征,时间分布上具有持续性和周期性特点;岩溶塌陷均为碳酸盐岩型的小型土层塌陷,以人为因素诱发为主,自然因素诱发为次,主要危害形式为建筑损坏和农田破坏;岩溶塌陷形成地质模式主要有潜蚀效应致塌,潜蚀、失托增荷和吸蚀效应叠加致塌,潜蚀和振动效应叠加致塌和潜蚀和垂直渗压效应叠加致塌等四种;从上层决策和工程技术角度提出了岩溶塌陷防治措施,为打造广州北部生态农业区和生态公园,建设美丽宜居岭南乡村提供地质科学依据。     

广西石灰岩山地合理利用模式研究

本文在分析广西石灰岩山地特点的基础上，探讨了其合理利用的模式，如林果药结合模式、饲料林模式、竹林模式，木本粮食林模式、纤维原料林模式、木本油料模式、特硬材林模式、药用林模式、藤本植物模式，封山育林模式，等等。采用这些模式利用石灰岩山地，具有良好的经验、生态和社会效益，是石灰岩山区人民脱贫致富的有效途径。     

Large Tetrapod Burrows from the Permian Naobaogou Formation of the Daqingshan Area,Nei Mongol,China

Two new tetrapod burrow casts from the Naobaogou Formation （Middle or Late Permian） of Nei Mongol,China are described.It marks the first pre-Cenozoic tetrapod burrow from China,and one of the earliest records of tetrapod burrows.Comparison to other Permian and Triassic burrows suggests that these burrows were created by tetrapod slightly smaller than Lystrosaurus.Deduced from the morphology and sizes of two burrows and known tetrapods of the Naobaogou Formation,the burrow should be the production of a therapsid,most likely a dicynodon.These burrows indicate a seasonal climate and this area was semiarid or arid during that time.     

《贵州气象》投稿须知

正1论文内容及文字量《贵州气象》是贵州省气象局主管,贵州省气象学会、贵州省山地环境气候研究所主办的气象科技期刊,国内外公开发行,双月刊。主要刊登气象学各分支学科的研究论文及技术总结等未经公开发表或出版过的原创性论文。本刊常设栏目有:研究论文或、应用技术、     

丘陵浅山地区风速幂指数及其在大气环境质量预测中的应用

根据丘陵浅山地区8个测点低空风速实测资料进行风速廓线拟合，求得风速幂指数，将大气环境质量预测中的风速模式化，用来预测大气污染物的浓度分布。     

嵊州市地质灾害避险公寓式安置纪实

嵊州市地处浙东丘陵山地,区内蠕变破坏的玄武岩台地滑坡分布较广,全市现有各类地质灾害危险点113余处,为浙江省地质灾害重灾县（市）之一,因此地质灾害避险安置工作显得极为重要。     

Mountain Land Use Planning of Metropolitan Suburbs： the Case of the Jinyun Mountain and Its Surrounding area, Chongqing, China

Open space of metropolitan suburbs in mountain region, has been increasingly becoming the coupling mosaic structure of industrial actions and landscape behaviors. However, the local governments, when making land use planning, often aim at economic development, and rarely refer to the coordination of compatibilities and conflicts between industrial actions and landscape behaviors in the mosaic structure. In this study land use in the Jinyun Mountain and its surrounding area, Chongqing is adjusted by gray multi-objective programming approach and local-level decision-making process to cope with conflicts between objectives for human welfare and objectives for landscape conservation. The results indicate that： 1） the compatibilities and conflicts among different behavior characters and different landscape types result in the compatibilities of landscape to human behavior; 2） a land use planning in the study area is produced based on the sustainable land use and social-eco development, which pays more attention to the resources and environment constraints and economic objectives, and follows the distribution law of rare resources; 3） in the study area, cultivated land of 1,207.27 ha can meet the demands for food and byproducts by the residents there, orchard land and forestland of 632.55 ha, 2,276.61 ha, respectively can provide enough spaee for the local people to improve their living structure and meet their demands for reereational activities, and urban residential land, rural residential land, mining land and transportation land of 1107.60 ha, 120.27 ha, 162.48 ha, 100.91 ha, respeetively can satisfy the resident＇s eeonomie development and infrastructures; 4） the equilibrium among industrial actions, landscape accessibility and ecological conservation can be obtained by analyzing the possible impaets of human activities on landscape eeologieal proeess in open spaee of metropolitan suburbs in mountain areas.     

松嫩平原地下水在农牧业方面的利用

黑龙江省位于祖国的东北边陲,有广大的丘陵山区,盛产木材,蕴藏着丰富的矿产资源。肥沃的平原是粮食和经济作物的主要产区,辽阔的草原是发展畜牧业的场所。农田、牧区的水利建设,对抗御自然灾害,获取农牧业丰收,起到了一定的作用。因此,认识和掌握地下水的情况,充分利用和开发地下水资源在农牧业发展中的积极作用,已成为我省商品粮基地建设需要研究解决的重要课题。[第一段]