圆形数值波浪水池斜向和多向入射波浪模拟研究     

任兴月  陶军  彭伟 《海洋工程》2018,36(4):78-87

为了研究斜向入射波浪,基于三维不可压缩两相流模型,开发了一套圆形数值波浪水池数值模型。在圆形波浪水池中,通过源项造波法成功生成了任意入射方向的波浪,并且利用人工摩擦项模拟阻尼区以数值耗散反射波浪。模型基于嵌入式多块网格体系,采用FVM法(finite volume method)离散Navier-Stokes方程,VOF法(volume of fluid)追踪自由水面。试验结果表明,斜向入射波浪的模拟结果与理论值基本一致,圆形波浪水池在模拟斜向入射波浪时,有效区域的面积较传统波浪水池显著增大,而且有效区域受波浪入射角度的影响也较小。同时,通过叠加多列斜向入射波浪,模拟出了多向交叉波列,并通过与理论结果对比,发现其具有较高的精度。  相似文献   

西藏尼木斑岩铜多金属矿区后续地质勘查思考   总被引：1，自引：0，他引：1  

胡光龙 《云南地质》2011,30(4):394-397

根据前期勘查结果,岗讲Ⅰ号矿体品位偏低,矿体厚度、产状变化较大,形态较复杂,应加强矿区基础地质工作,综合地质研究工作,总结铜、钼空间富集规律,建立成矿模式,指导矿区深部及外围找矿的合理化布局。  相似文献   

汶川MS8.0级大震前天基与陆基电场资料联合应用研究   总被引：3，自引：0，他引：3       下载免费PDF全文

安张辉  杜学彬  范莹莹  刘君  谭大诚  陈军营  解滔 《地球物理学报》2011,54(11):2876-2884

利用边际谱方法对2008年5月12日四川汶川地震前天基和陆基电场变化情况进行了联合分析研究,结果表明:(1)空间电场方面,由重复轨道和连续轨道电场边际谱演化看出,电离层电场从2008年4月27日左右开始,其边际谱出现了明显的增强现象(增大1~2个量级),这种现象一直持续到汶川地震发生.(2)陆基电场方面,中法合作的松山...  相似文献   

Removal of Selenium by Adsorption onto Granular Activated Carbon (GAC) and Powdered Activated Carbon (PAC)     

Kailas L. Wasewar  Basheshwar Prasad  Sekhararao Gulipalli 《洁净——土壤、空气、水》2009,37(11):872-883

The present work involves the study of Se(IV) adsorption onto granular activated carbon (GAC) and powdered activated carbon (PAC). The adsorbents are coated with ferric chloride solution for the effective removal of selenium. The physico-chemical characterization of the adsorbents is carried out using standard methods, e. g., proximate analysis, scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FTIR), thermo-gravimetric (TGA) and differential thermal analysis (DTA), etc. The FTIR spectra of the GAC and PAC indicate the presence of various types of functional groups, e. g., free and hydrogen bonded OH groups, silanol groups (Si-OH), alkenes, and CO group stretching from aldehydes and ketones on the surface of adsorbents. Batch experiments are carried out to determine the effect of various factors such as adsorbent dose (w), initial pH, contact time (t), and temperature (T) on the adsorption process. The optimum GAC and PAC dosage is found to be 10 g/L and 8 g/L, respectively, for Se(IV) removal with C₀ = 100 mg/L. The percent removal of Se(IV) increases with increasing adsorbent concentration, while removal per unit weight of adsorbent increases with decreasing adsorbent concentration. Se(IV) adsorption onto both the GAC and PAC adsorbents is high at low pH values, and decreases with increased initial pH. The results obtained are analyzed by various kinetic models. The parameters of pseudo-first order, pseudo-second order kinetics, and Weber-Morris intra particle kinetics are determined. It is seen that the sorption kinetics of Se(IV) onto GAC and PAC can be best represented by the pseudo-second order kinetic model.  相似文献   

汶川8.0级地震震害遥感定量化初步研究——以都江堰城区破坏为例   总被引：8，自引：1，他引：7  

王晓青  王龙  章熙海  丁香  邱虎  董彦芳  窦爱霞  张飞宇  刘在涛 《地震》2009,29(1)

随着遥感技术的飞速发展,遥感在地震应急救援、灾害调查和损失评估中的作用越来越显著.然而由于缺乏系统的遥感震害定量研究,使得遥感的实用性常常受到质疑.文中叙述了遥感震害定量研究的基本思路,提出了遥感震害指数的概念与定量分析的基本模型,并以2008年汶川8.0级地震造成的都江堰城区震害为例,依据建筑物震害遥感解译结果和地面震害调查结果,进行了都江堰城区部分街区的建筑物遥感震害指数和地面调查震害指数的统计分析,并建立了两者之间的统计关系.初步研究结果表明,依据高分辨率航空遥感影像和卫星雷达图像建立的建筑物遥感震害指数与地面调查震害指数及房屋倒塌率存在显著的对应性.因此,通过遥感震害定量化研究,将为地震震害调查、损失评估提供有力的方法和工具.  相似文献   

抗滑桩在某滑坡治理中的应用研究     

高文信 《云南地质》2014,(2):264-267

通过对某龙江电站坝址左岸一滑坡进行分析、评价,经综合比较,确定抗滑桩治理方案,并对抗滑桩进行优化设计,保证了工程质量,节省了投资.  相似文献   

Study on Model of Atmospheric Refraction in GPS Measurement   总被引：1，自引：0，他引：1  

《中国地震研究》1998,(3)

  相似文献   

华北地区GPS监测网建设,地壳水平运动与应力场及地震活动性的关系   总被引：17，自引：1，他引：16  

李延兴  赵承坤 《中国地震》1998,14(2):116-125

简要地介绍了华北地区、特别是首都圈ＧＰＳ地震监测网的布设、观测、数据处理方法案和监测精度等,较详细地分析了地壳水平形变与构造运动、应力场变化以及地震活动的性的关系。  相似文献   

山地学的研究对象和内容浅议──续《发展山地学之我见》     

余大富 《山地学报》1998,(1)

建议将山地学的研究对象定为以地域自然-人文综合体存在的山地系统即山地人地系统．据此提出了山地学的研究内容应围绕山地系统的性质、结构、功能及其演变理论和研究方法这一中心论题展开．  相似文献   

GIScience Journals Ranking and Evaluation: An International Delphi Study   总被引：4，自引：0，他引：4  

Claude Caron  Stéphane Roche  Daniel Goyer  Annick Jaton 《Transactions in GIS》2008,12(3):293-321

Researchers’ fame in most scientific fields is closely linked to their publishing capacity, both in terms of quantity and quality. In GIScience, as in other fields, this situation demands that the researcher evaluate and to be very familiar with the scientific journals in which they could publish. Some specialized journals (e.g. Journal of Citation Reports or JCR) are devoted to ranking these reviews according to various methods and criteria. Compared to other scientific communities, GIScience is relatively new and constantly evolving. Therefore, the journals of this field do not benefit from any real formal ranking yet. The objective of this paper is to present the process and results of a study aimed at addressing this gap. More specifically, the challenge is to elaborate an importance ranking of the scientific journals in the field of GIScience. To do so, both a qualitative (Delphi study carried out with 40 international experts) and a quantitative (JCR impact factor) approach has been implemented. This triangulation method leads to an early global ranking of the journals of this field.  相似文献